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The Ultimate Guide to Flange Bearings

Flange bearing is a mechanical element used to support and guide rotating shafts. It has an inner ring track and an outer bearing housing. Flange bearings are divided into two types: one-way and two-way, which can bear both radial load and axial load. Compared with traditional bearings, flange bearings are usually used in applications with high loads and high speeds, such as in the automotive and mechanical engineering fields. This blog discusses in detail the components, materials, characteristics and application industries of flange bearings to provide a comprehensive and in-depth understanding of this field.

Table of Contents

What is a flange bearing

Flange bearings are bearings in which the flange and the bearing are integrated. Flange bearings show their advantages when one end of the shaft does not have a connector and needs to be fixed on the plane of the mechanical equipment. The series of bearings with flanges on the outer ring make axial positioning simple, no longer require a bearing seat, and become economical. Flange bearings usually consist of inner rings, outer rings, steel balls, cages, sealing covers, chassis shells and other components. Among the most commonly used types of flange bearings are flange ball bearings and flange ball bearings with extended inner rings. Although the structures of these two types of flange bearings are different, they basically have the same feature, that is, a certain number of steel balls are set between the outer ring and the inner ring installed on the flange to withstand vertical and Loads and moments in the horizontal direction. In order to obtain low friction torque, high rigidity, and good rotation accuracy of flange bearings, small-diameter steel balls are generally used. Among flange ball bearings, it can be divided into ZZ steel plate flange ball bearing dust cover series, RS rubber flange ball bearing seal series, Teflon flange ball bearing seal series, stainless steel flange ball bearing series, ceramic flange Ball bearing series, etc.

Advantages of flange bearings

Compared with other types of bearings, flange bearings have the following advantages:

1. Strong load-bearing capacity: Flange bearings use rolling elements to support and transmit loads. Compared with sliding bearings, they have higher load-bearing capacity and can better withstand vibration and impact loads. Therefore, it is widely used in high-load and high-speed mechanical equipment.
2. Small friction coefficient: Flange bearings use rolling friction, which has a smaller friction coefficient than sliding friction. This not only reduces power consumption, but also reduces wear and heat generation, increasing the service life of the bearings.
3. High rotational speed: Because the flange bearing uses rolling friction and has a small friction coefficient, it can withstand higher rotational speeds. This makes flange bearings suitable for high-speed rotating mechanical equipment, such as automobile engines, wind turbines, etc.
4. Easy installation: Flange bearings usually have a fixed external structure and can be directly fixed on mechanical equipment through bolts or welding, making installation easy and saving time.
5. Easy maintenance: The flange bearing adopts modular design and is easy to disassemble and replace. At the same time, the lubrication of flange bearings is relatively simple, and common grease or oil can be used for maintenance.

Flange ball bearing catalog

Miniature Flanged Ball Bearings

Part Number	Seal Type	Bore Dia	Outer Dia	Width	Flange Outer Dia	Ring Material	Max Speed (X1000 rpm)	Weight
SF627 2rs	Sealed	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
SF627zz	Shielded	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
F609	Open	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	16.10 g
SF609	Open	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	16.10 g
F609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
F609zz	Shielded	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
SF609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
SF609zz	Shielded	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
MF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	52100 Chrome Steel	38	2.13 g
SMF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	440C Stainless Steel	34.2	2.13 g
F685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
F685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
SF685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
SF685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
MF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
MF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
SMF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
SMF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
F679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
F679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
SF679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
SF679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
F686	Open	6 mm	13 mm	3.5 mm	15 mm	52100 Chrome Steel	40	2.21 g
SF686	Open	6 mm	13 mm	3.5 mm	15 mm	440C Stainless Steel	36	2.21 g
F687	Open	7 mm	14 mm	3.5 mm	16 mm	52100 Chrome Steel	40	2.4 g
SF687	Open	7 mm	14 mm	3.5 mm	16 mm	440C Stainless Steel	36	2.4 g
F604	Open	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.42 g
MF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
MF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
SF604	Open	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.42 g
SMF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
SMF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
FR3	Open	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	2.5 g
SFR3	Open	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	2.5 g
FR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
FR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
SFR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
SFR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
F604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
F604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
SF604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
SF604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
F695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
F695zz	Shielded	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
SF695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
SF695zz	Shielded	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
F695	Open	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.73 g
SF695	Open	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.73 g
F686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
F686zz	Shielded	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
SF686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
SF686zz	Shielded	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
FR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	3.24 g
FR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	52100 Chrome Steel	43	3.24 g
SFR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	3.24 g
SFR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	440C Stainless Steel	38.7	3.24 g
F687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
F687zz	Shielded	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
SF687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
SF687zz	Shielded	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
F624	Open	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.44 g
SF624	Open	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.44 g
F688	Open	8 mm	16 mm	4 mm	18 mm	52100 Chrome Steel	36	3.53 g
SF688	Open	8 mm	16 mm	4 mm	18 mm	440C Stainless Steel	32.4	3.53 g
F624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
F624zz	Shielded	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
SF624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
SF624zz	Shielded	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
F605	Open	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.83 g
SF605	Open	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.83 g
F689	Open	9 mm	17 mm	4 mm	19 mm	52100 Chrome Steel	36	3.85 g
SF689	Open	9 mm	17 mm	4 mm	19 mm	440C Stainless Steel	32.4	3.85 g
F696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
F696zz	Shielded	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
SF696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
SF696zz	Shielded	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
F605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
F605zz	Shielded	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
SF605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
SF605zz	Shielded	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
F696	Open	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.24 g
SF696	Open	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.24 g
F688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
F688zz	Shielded	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
SF688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
SF688zz	Shielded	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
FR4	Open	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.82 g
SFR4	Open	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.82 g
F689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
F689zz	Shielded	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
SF689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
SF689zz	Shielded	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
FR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
FR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
SFR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
SFR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
F625	Open	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.37 g
SF625	Open	5 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	5.37 g
F625 2rs	Sealed	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g
F625zz	Shielded	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g

Miniature Flanged Ball Bearings With Extended Inner Ring

Part Number	Seal Type	Bore Dia	Outer Dia	Width	Flange Outer Dia	Ring Material	Max Speed (X1000 rpm)	Weight
SF627 2rs	Sealed	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
SF627zz	Shielded	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
F609	Open	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	16.10 g
SF609	Open	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	16.10 g
F609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
F609zz	Shielded	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
SF609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
SF609zz	Shielded	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
MF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	52100 Chrome Steel	38	2.13 g
SMF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	440C Stainless Steel	34.2	2.13 g
F685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
F685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
SF685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
SF685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
MF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
MF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
SMF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
SMF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
F679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
F679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
SF679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
SF679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
F686	Open	6 mm	13 mm	3.5 mm	15 mm	52100 Chrome Steel	40	2.21 g
SF686	Open	6 mm	13 mm	3.5 mm	15 mm	440C Stainless Steel	36	2.21 g
F687	Open	7 mm	14 mm	3.5 mm	16 mm	52100 Chrome Steel	40	2.4 g
SF687	Open	7 mm	14 mm	3.5 mm	16 mm	440C Stainless Steel	36	2.4 g
F604	Open	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.42 g
MF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
MF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
SF604	Open	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.42 g
SMF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
SMF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
FR3	Open	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	2.5 g
SFR3	Open	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	2.5 g
FR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
FR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
SFR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
SFR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
F604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
F604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
SF604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
SF604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
F695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
F695zz	Shielded	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
SF695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
SF695zz	Shielded	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
F695	Open	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.73 g
SF695	Open	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.73 g
F686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
F686zz	Shielded	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
SF686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
SF686zz	Shielded	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
FR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	3.24 g
FR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	52100 Chrome Steel	43	3.24 g
SFR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	3.24 g
SFR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	440C Stainless Steel	38.7	3.24 g
F687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
F687zz	Shielded	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
SF687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
SF687zz	Shielded	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
F624	Open	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.44 g
SF624	Open	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.44 g
F688	Open	8 mm	16 mm	4 mm	18 mm	52100 Chrome Steel	36	3.53 g
SF688	Open	8 mm	16 mm	4 mm	18 mm	440C Stainless Steel	32.4	3.53 g
F624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
F624zz	Shielded	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
SF624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
SF624zz	Shielded	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
F605	Open	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.83 g
SF605	Open	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.83 g
F689	Open	9 mm	17 mm	4 mm	19 mm	52100 Chrome Steel	36	3.85 g
SF689	Open	9 mm	17 mm	4 mm	19 mm	440C Stainless Steel	32.4	3.85 g
F696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
F696zz	Shielded	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
SF696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
SF696zz	Shielded	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
F605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
F605zz	Shielded	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
SF605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
SF605zz	Shielded	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
F696	Open	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.24 g
SF696	Open	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.24 g
F688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
F688zz	Shielded	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
SF688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
SF688zz	Shielded	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
FR4	Open	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.82 g
SFR4	Open	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.82 g
F689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
F689zz	Shielded	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
SF689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
SF689zz	Shielded	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
FR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
FR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
SFR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
SFR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
F625	Open	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.37 g
SF625	Open	5 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	5.37 g
F625 2rs	Sealed	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g
F625zz	Shielded	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g

Large Size Flanged Ball Bearings

Part Number	Seal Type	Bore Dia	Outer Dia	Width	Flange Outer Dia	Ring Material	Max Speed (X1000 rpm)	Weight
SF627 2rs	Sealed	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
SF627zz	Shielded	7 mm	22 mm	7 mm	25 mm	440C Stainless Steel	27	14.40 g
F609	Open	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	16.10 g
SF609	Open	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	16.10 g
F609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
F609zz	Shielded	9 mm	24 mm	7 mm	27 mm	52100 Chrome Steel	32	17.40 g
SF609 2rs	Sealed	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
SF609zz	Shielded	9 mm	24 mm	7 mm	27 mm	440C Stainless Steel	28.8	17.40 g
MF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	52100 Chrome Steel	38	2.13 g
SMF148	Open	8 mm	14 mm	3.5 mm	15.6 mm	440C Stainless Steel	34.2	2.13 g
F685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
F685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	52100 Chrome Steel	45	2.15 g
SF685 2rs	Sealed	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
SF685zz	Shielded	5 mm	11 mm	5 mm	12.5 mm	440C Stainless Steel	40.5	2.15 g
MF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
MF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	52100 Chrome Steel	40	2.17 g
SMF137 2rs	Sealed	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
SMF137zz	Shielded	7 mm	13 mm	4 mm	14.6 mm	440C Stainless Steel	36	2.17 g
F679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
F679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	52100 Chrome Steel	36	2.20 g
SF679 2rs	Sealed	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
SF679zz	Shielded	9 mm	14 mm	4.5 mm	15.5 mm	440C Stainless Steel	32.4	2.20 g
F686	Open	6 mm	13 mm	3.5 mm	15 mm	52100 Chrome Steel	40	2.21 g
SF686	Open	6 mm	13 mm	3.5 mm	15 mm	440C Stainless Steel	36	2.21 g
F687	Open	7 mm	14 mm	3.5 mm	16 mm	52100 Chrome Steel	40	2.4 g
SF687	Open	7 mm	14 mm	3.5 mm	16 mm	440C Stainless Steel	36	2.4 g
F604	Open	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.42 g
MF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
MF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	52100 Chrome Steel	38	2.42 g
SF604	Open	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.42 g
SMF148 2rs	Sealed	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
SMF148zz	Shielded	8 mm	14 mm	4 mm	15.6 mm	440C Stainless Steel	34.2	2.42 g
FR3	Open	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	2.5 g
SFR3	Open	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	2.5 g
FR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
FR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	52100 Chrome Steel	40	2.54 g
SFR188 2rs	Sealed	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
SFR188zz	Shielded	0.25″	0.5″	0.1875″	0.547″	440C Stainless Steel	36	2.54 g
F604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
F604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	52100 Chrome Steel	48	2.57 g
SF604 2rs	Sealed	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
SF604zz	Shielded	4 mm	12 mm	4 mm	13.5 mm	440C Stainless Steel	43.2	2.57 g
F695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
F695zz	Shielded	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.65 g
SF695 2rs	Sealed	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
SF695zz	Shielded	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.65 g
F695	Open	5 mm	13 mm	4 mm	15 mm	52100 Chrome Steel	43	2.73 g
SF695	Open	5 mm	13 mm	4 mm	15 mm	440C Stainless Steel	38.7	2.73 g
F686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
F686zz	Shielded	6 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.06 g
SF686 2rs	Sealed	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
SF686zz	Shielded	6 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.06 g
FR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	52100 Chrome Steel	43	3.24 g
FR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	52100 Chrome Steel	43	3.24 g
SFR3 2rs	Sealed	0.1875″	0.5″	0.1906″	0.565″	440C Stainless Steel	38.7	3.24 g
SFR3zz	Shielded	0.1875″	0.5″	0.196″	0.565″	440C Stainless Steel	38.7	3.24 g
F687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
F687zz	Shielded	7 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.35 g
SF687 2rs	Sealed	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
SF687zz	Shielded	7 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.35 g
F624	Open	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.44 g
SF624	Open	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.44 g
F688	Open	8 mm	16 mm	4 mm	18 mm	52100 Chrome Steel	36	3.53 g
SF688	Open	8 mm	16 mm	4 mm	18 mm	440C Stainless Steel	32.4	3.53 g
F624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
F624zz	Shielded	4 mm	13 mm	5 mm	15 mm	52100 Chrome Steel	40	3.54 g
SF624 2rs	Sealed	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
SF624zz	Shielded	4 mm	13 mm	5 mm	15 mm	440C Stainless Steel	36	3.54 g
F605	Open	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	3.83 g
SF605	Open	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	3.83 g
F689	Open	9 mm	17 mm	4 mm	19 mm	52100 Chrome Steel	36	3.85 g
SF689	Open	9 mm	17 mm	4 mm	19 mm	440C Stainless Steel	32.4	3.85 g
F696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
F696zz	Shielded	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.04 g
SF696 2rs	Sealed	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
SF696zz	Shielded	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.04 g
F605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
F605zz	Shielded	5 mm	14 mm	5 mm	16 mm	52100 Chrome Steel	40	4.12 g
SF605 2rs	Sealed	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
SF605zz	Shielded	5 mm	14 mm	5 mm	16 mm	440C Stainless Steel	36	4.12 g
F696	Open	6 mm	15 mm	5 mm	17 mm	52100 Chrome Steel	40	4.24 g
SF696	Open	6 mm	15 mm	5 mm	17 mm	440C Stainless Steel	36	4.24 g
F688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
F688zz	Shielded	8 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	4.51 g
SF688 2rs	Sealed	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
SF688zz	Shielded	8 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	4.51 g
FR4	Open	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.82 g
SFR4	Open	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.82 g
F689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
F689zz	Shielded	9 mm	17 mm	5 mm	19 mm	52100 Chrome Steel	36	4.87 g
SF689 2rs	Sealed	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
SF689zz	Shielded	9 mm	17 mm	5 mm	19 mm	440C Stainless Steel	32.4	4.87 g
FR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
FR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	52100 Chrome Steel	38	4.9 g
SFR4 2rs	Sealed	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
SFR4zz	Shielded	0.25″	0.625″	0.196″	0.69″	440C Stainless Steel	34.2	4.9 g
F625	Open	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.37 g
SF625	Open	5 mm	16 mm	5 mm	18 mm	440C Stainless Steel	32.4	5.37 g
F625 2rs	Sealed	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g
F625zz	Shielded	5 mm	16 mm	5 mm	18 mm	52100 Chrome Steel	36	5.52 g

Common materials for flange ball bearings

As mentioned above, flange ball bearings consist of balls, cages, inner and outer rings, and outer flanges. The materials generally used to manufacture flange ball bearings include high carbon chromium steel 52100, stainless steel 440, stainless steel 316, ceramic materials (silicon nitride, zirconia, silicon carbide) and various plastics. We explain the materials of flange ball bearings one by one.

Ball materials for flange bearings

In flange bearings, steel balls are important components that bear load and provide support. The steel balls pass through the rolling surface and roll cyclically along the direction between the inner and outer rings of the bearing. Therefore, factors such as the load, rotation speed, ambient temperature and adaptability of the bearing need to be taken into consideration when selecting steel balls. For high-speed bearings, precision steel balls are generally required to ensure the high-speed performance and stability of flange bearings. The steel balls in flange bearings usually use high-carbon chromium steel balls, which have good material quality, moderate cost, high strength, good wear resistance, and strong corrosion resistance. They can withstand heavy loads and high-speed rotation, and maintain stable motion performance. Compared with ordinary steel balls, high-carbon chromium steel balls have a higher surface finish, are easier to roll, and have less friction, thus greatly reducing friction losses and wear of the bearings. At the same time, high-carbon chromium steel balls also have good corrosion resistance and are not easily corroded by chemicals such as acids, alkalis, and salts.

In special applications, steel balls made of special materials such as anti-wear alloys and ceramics are also needed to meet the needs of special environments. In short, steel balls are an important component in flange bearings, and their material and quality have a decisive impact on the performance and life of the bearing. Therefore, when purchasing flange bearings, you need to choose steel balls with stable quality and excellent workmanship. While ensuring the normal operation of the bearings, you can also reduce equipment maintenance and replacement costs, and improve production efficiency and economic benefits.

Cage material for flange bearings

Commonly used materials for flange bearing cages include copper, synthetic resin, and steel. The copper cage has high strength and wear resistance and is used in high-temperature and high-speed applications; the synthetic resin cage has good corrosion resistance and self-lubricating properties and is suitable for low-speed and humid environments; the steel cage has good fatigue resistance and lifespan , suitable for occasions with large loads.

Inner and outer ring materials of flange bearings

SAE52100 chromium steel flange bearings

Higher hardness, longer service life
Lower cost
Suitable for 120°C constant temperature to 150°C intermittent temperature
Poor corrosion resistance

The material that most flange ball bearings are made of is chromium steel. Chromium steel 52100 is harder than stainless steel, which means a higher lifespan rating. Chromium Steel 52100 also has lower noise qualities than standard 440 grade stainless steel. Chromium steel actually has low chromium content and is not resistant to corrosion. Chromium steel can withstand continuous temperatures up to 120°C. Above this temperature, it undergoes greater dimensional changes and the hardness is affected, reducing load capacity. It can intermittently withstand temperatures up to 150°C, but above this temperature bearing life is significantly reduced.

440 martensitic stainless steel flange bearings

Good corrosion resistance to water and many weak chemicals
Suitable for -70°C to 250°C constant temperature or 300°C intermittent temperature
Slightly softer than chromium steel and therefore lower load rating
Will corrode in salt water or salt spray, poor acid/alkali resistance
 expensive than chrome steel

Grade 440 stainless steel is resistant to corrosion due to its higher chromium content and the addition of nickel, and is the most commonly used for corrosion-resistant ball bearings. Chromium reacts with oxygen in the air to form a chromium oxide layer on the surface of the steel, called a passivation film. It is hardened by heat treatment and provides a good combination of strength and corrosion resistance.

The load capacity of AISI440 grade is approximately 20% lower than chromium steel, so the life rating will be slightly reduced. This grade has good corrosion resistance when exposed to fresh water and some weaker chemicals, but will corrode in saltwater environments or when in contact with many corrosive chemicals. Grade 440 stainless steel can also withstand higher temperatures than chromium steel, withstanding constant temperatures up to 250°C and intermittent temperatures up to 300°C with reduced load capabilities. Above 300°C, bearing life can be significantly shortened.

AISI316 austenitic stainless steel flange bearings

Very good corrosion resistance to water, salt water and many chemicals
Fully compensated type suitable for temperatures up to 500°C
Suitable for low temperature applications down to -250°C
Response to magnetic field is negligible
 expensive than grade 440 due to low output.
Only suitable for very low loads and low speeds
Not suitable for low noise applications

Grade 316 stainless steel flange bearings are used for higher corrosion resistance to seawater, salt spray and certain acids/alkalis. They are suitable for very high temperature applications as steel is useful at temperatures up to 500°C. They can also be used in cryogenic applications as steel retains its toughness at -250°C. Unlike grade 440 bearings, 316 stainless steel bearings are classified as non-magnetic because their response to magnetic fields is negligible, although 316 stainless steel may become magnetic after cold working.

Grade 316 stainless steel cannot be hardened by heat treatment and can only support low loads and low speeds. 316 stainless steel ball bearings have significantly lower load and speed ratings than equivalent Grade 440 bearings. Grade 316 stainless steel has good corrosion resistance when used in marine environments, if used above the waterline, or when temporarily submerged when flushed with clean water. It is less suitable when permanently submerged unless there is regular high velocity water flow over the bearing. This is because the passivation film on the stainless steel surface relies on the presence of oxygen to regenerate itself. In low-oxygen underwater marine environments (such as under stagnant seawater or mud/silt), steel may be susceptible to pitting or crevice corrosion. 316 stainless steel is less resistant to warm seawater. Pitting corrosion is a risk in seawater above 30°C, while crevice corrosion can occur at 10-15°C, and Grade 316 is still corrosion-resistant than Grade 440. Bearings made of grade 316 stainless steel can be used at high temperatures provided that suitable cage materials are used or the bearings are fully packed. Polyethylene, PEEK or PTFE are commonly used for cages in 316 stainless steel bearings.

Plastic flange bearings

Acetal resin

Excellent corrosion resistance to water, salt water and weak chemicals
Non-magnetic
Only semi-precision grade
Temperature range -40°C to +110°C
Only suitable for very low loads and low speeds

Polyetheretherketone

Excellent corrosion resistance to water, salt water and most chemicals
Good high temperature performance
Non-magnetic
Wide temperature range from -70°C to +250°C
Only semi-precision, but stronger and therefore suitable for higher loads and speeds than other plastics

Polyethylene

Excellent corrosion resistance to water, salt water and many chemicals
Extremely low hygroscopicity
Non-magnetic
Temperature range is -40°C to +80°C
Only suitable for low load, low speed and half precision

Polytetrafluoroethylene (PT)

Excellent corrosion resistance to water, salt water and most chemicals
Extremely low hygroscopicity
Good high temperature performance
Non-magnetic
Extremely wide temperature range from -190°C to +200°C
Suitable for lower loads and speeds than other plastics and only semi-precision

Aubearing’s standard plastic corrosion-resistant bearings feature acetal resin (POM-C) rings, nylon (PA66) cages and balls made of 316 stainless steel or glass. They are also suitable for food applications. However, they corrode in the presence of certain chemicals, and PA66 cages can absorb moisture after prolonged exposure, resulting in a loss of tensile strength. There are many alternative materials available for rings, cages and balls, such as polypropylene, polytetrafluoroethylene, polytetrafluoroethylene, polyetherketone or polytetrafluoroethylene. All plastic bearings are semi-precision and, like 316 stainless steel bearings, should not be used in precision applications. Due to the softer material, they are not suitable for anything other than low loads and speeds, although PEEK has better load-carrying capabilities. Corrosion resistance varies by material, with PTFE, PEEK and PTFE having the best all-around chemical resistance.

When using plastic bearings at high temperatures, care should be taken to select the correct material. Acetal bearings should not be used at temperatures above 110°C, and polypropylene can only be used at temperatures up to 80°C, but other materials have good high temperature resistance, especially PTFE and PEEK, and they are both suitable at temperatures up to 250°C, although PTFE has a lower load rating. Generally, plastic bearings are not recommended for vacuum applications. PEEK is an exception with very good outgassing properties.

Ceramic flange bearings

Fully ceramic bearings are much expensive than steel bearings and therefore are often used in environments that are too harsh for steel bearings. They have good corrosion resistance, depending on the materials and chemicals encountered, and are usually supplied without lubrication. They are non-magnetic and, in addition to silicon carbide, are electrically insulating. Fully ceramic bearings can have a PTFE or PEEK cage or are available as full complement, i.e. without a cage. If supplied as a full complement, they can be used at very high temperatures.

Zirconia flange bearings

Zirconia flange bearings have high corrosion resistance to acids and alkalis, but may degrade after prolonged exposure to hot water or steam. Low-temperature degradation of zirconia in the presence of moisture or water has also been studied. There is evidence that the surface weakens at low or room temperatures, but the effect on bearing performance is inconclusive and is not thought to seriously affect zirconia bearings.

Wide temperature range from -190°C to 400°C
Non-magnetic and electrically insulating
Speed and load are lower than steel bearings
Not suitable for low noise applications
Density is 75% of steel

Compared with other ceramics, it has higher flexural strength and lower elastic modulus, so it is suitable for small impact loads and interference fits. The expansion properties are similar to chromium steel and the same as 440 stainless steel, so there is no problem in using it with steel shafts at high temperatures.

Silicon Nitride/Si3N4 (prefix "CCSI") flange bearings

Very good corrosion resistance to water, salt water, acid and alkali
Extremely wide temperature range from -210°C to 800°C, no cage required
Non-magnetic, electrically insulating, suitable for high vacuum applications
Speed and load are lower than precision steel bearings, but Si3N4 balls are used in high-speed hybrid ceramic bearings
Not suitable for low noise applications
Density is 40% of steel
Not recommended for impact loads or interference fits

Silicon carbide flange bearings

Best corrosion resistance of ceramics
Best high temperature performance, up to 1600°C, no cage required
Non-magnetic
Conductive
Density 40% of steel
Very low thermal expansion, so consider shaft/housing suitable for high temperature applications
The most brittle and therefore unable to withstand impact loads

Since ceramics are much harder than steel, they are brittle. Steel can withstand larger impacts through plastic deformation, while ceramics are susceptible to cracking. Therefore, the use of all-ceramic bearings, especially silicon nitride and silicon carbide, is not recommended where heavy impact loads are likely to occur. Due to the greater brittleness of steel bearings, fully ceramic bearings will carry approximately 65% to 75% of the load of steel bearings. The limit speed of all-ceramic bearings is only about 25% of that of steel bearings because the rings are less rounded than steel and have a greater risk of sudden failure due to lower bending strength.

Using silicon nitride or silicon carbide bearings with steel shafts or housings in high temperature applications can cause installation problems due to large differences in expansion coefficients. Bearing damage can occur if the greater expansion of the steel shaft in the ceramic inner ring at high temperatures is not taken into account. Zirconia is less of a problem because the coefficient of expansion is similar to steel. See the Shaft/Housing Fits section for information.

Hybrid Ceramic Flange Bearings

Hybrid ceramic flange bearings (prefix “CB” or “SCB”): Silicon nitride is the most popular ball in hybrid ceramic bearings because it is only 40% as dense as bearing steel but much harder, so Has greater wear resistance. Hybrid ceramic bearings are also able to achieve higher speeds due to the lower centrifugal force generated by the ceramic balls. However, due to the lower elasticity of the ball, the contact area between the ball and the raceway is smaller, resulting in higher contact pressure. This can cause the raceways to wear faster. When fully lubricated, the speed of hybrid ceramic bearings increases by approximately 30-40%. Hybrid ceramic bearings also operate better with limited lubrication, but operating speeds should be reduced. They also skid less frequently at low loads under high acceleration.

Stainless steel flange bearings

Stainless steel flange bearings are used and widely. This article specifically lists the advantages of stainless steel flange bearings. For some special applications, stainless steel flange bearings play an irreplaceable role.

1. Water washing is stress-free: I believe everyone knows that many things are easy to rust after being washed. Once rusted, the service life of the product is greatly reduced. However, stainless steel flange bearings can be washed with confidence, even after being washed with water. Lubricant needs to be added again.
2. Strong corrosion resistance: Due to the characteristics of the stainless steel material itself, the corrosion resistance of stainless steel flange bearings is also very strong and can be applied in many environments.
3. Can run in liquid: Many bearings cannot be used in liquid, but stainless steel flange bearings can run well in liquid.
4. Clean and hygienic: Due to the excellent corrosion resistance of stainless steel flange bearings, they can still remain clean and hygienic after being used for a long time.
5. Strong temperature resistance. The temperature resistance of stainless steel flange bearings is very strong. According to research, it can be used normally in an environment of -60°C~+200°C, so this can make its use complex and Harsh working conditions.
Stainless steel flange bearings are also used in a wide range of applications. They can be seen on various precision instruments, equipment, electronic machinery, power tools, chemical machinery, vehicles, etc.

Stainless steel flange bearing catalog

Part Number	Seal Type	Bore Dia	Outer Dia	Width	Ring Material	Cage Material	Dynamic Radial Load	Static Radial Load
SF601x	Open	1.5 mm	6 mm	2.5 mm	440C Stainless Steel	300 Series Stainless Steel	56.925 lbf	15.975 lbf
SF601xzz	Shielded	1.5 mm	6 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	56.925 lbf	15.975 lbf
SF602	Open	2 mm	7 mm	2.8 mm	440C Stainless Steel	300 Series Stainless Steel	66.375 lbf	20.925 lbf
SF602 2rs	Sealed	2 mm	7 mm	3.5 mm	440C Stainless Steel	300 Series Stainless Steel	66.375 lbf	20.925 lbf
SF602x	Open	2.5 mm	8 mm	2.8 mm	440C Stainless Steel	300 Series Stainless Steel	94.95 lbf	28.8 lbf
SF602x 2rs	Sealed	2.5 mm	8 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	66.375 lbf	20.925 lbf
SF602xzz	Shielded	2.5 mm	8 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	94.95 lbf	28.8 lbf
SF602zz	Shielded	2 mm	7 mm	3.5 mm	440C Stainless Steel	300 Series Stainless Steel	66.375 lbf	20.925 lbf
SF603	Open	3 mm	9 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	46.575 lbf	30.6 lbf
SF603 2rs	Sealed	3 mm	9 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	46.575 lbf	30.6 lbf
SF603zz	Shielded	3 mm	9 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	46.575 lbf	30.6 lbf
SF604	Open	4 mm	12 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	164.925 lbf	56.7 lbf
SF604 2rs	Sealed	4 mm	12 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	164.925 lbf	56.7 lbf
SF604zz	Shielded	4 mm	12 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	164.925 lbf	56.7 lbf
SF605	Open	5 mm	14 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	228.825 lbf	82.125 lbf
SF605 2rs	Sealed	5 mm	14 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	228.825 lbf	82.125 lbf
SF605zz	Shielded	5 mm	14 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	228.825 lbf	82.125 lbf
SF606	Open	6 mm	17 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	389.7 lbf	137.025 lbf
SF606 2rs	Sealed	6 mm	17 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	389.7 lbf	137.025 lbf
SF606zz	Shielded	6 mm	17 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	389.7 lbf	137.025 lbf
SF607	Open	7 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF607 2rs	Sealed	7 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF607zz	Shielded	7 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF608	Open	8 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	566.775 lbf	223.425 lbf
SF608 2rs	Sealed	8 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	566.775 lbf	223.425 lbf
SF608zz	Shielded	8 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	566.775 lbf	223.425 lbf
SF609	Open	9 mm	24 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	577.8 lbf	234 lbf
SF609 2rs	Sealed	9 mm	24 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	577.8 lbf	234 lbf
SF609zz	Shielded	9 mm	24 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	577.8 lbf	234 lbf
SF623	Open	3 mm	10 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	108.45 lbf	35.55 lbf
SF623 2rs	Sealed	3 mm	10 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	108.45 lbf	35.55 lbf
SF623zz	Shielded	3 mm	10 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	108.45 lbf	35.55 lbf
SF624	Open	4 mm	13 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	223.875 lbf	78.975 lbf
SF624 2rs	Sealed	4 mm	13 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	223.875 lbf	78.975 lbf
SF624zz	Shielded	4 mm	13 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	223.875 lbf	78.975 lbf
SF625	Open	5 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	297.675 lbf	109.35 lbf
SF625 2rs	Sealed	5 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	297.675 lbf	109.35 lbf
SF625zz	Shielded	5 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	297.675 lbf	109.35 lbf
SF626	Open	6 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF626 2rs	Sealed	6 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF626zz	Shielded	6 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF627	Open	7 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	565.875 lbf	223.425 lbf
SF627 2rs	Sealed	7 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	565.875 lbf	223.425 lbf
SF627zz	Shielded	7 mm	22 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	565.875 lbf	223.425 lbf
SF634	Open	4 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	230.625 lbf	84.6 lbf
SF634 2rs	Sealed	4 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	230.625 lbf	84.6 lbf
SF634zz	Shielded	4 mm	16 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	230.625 lbf	84.6 lbf
SF635	Open	5 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF635 2rs	Sealed	5 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF635zz	Shielded	5 mm	19 mm	6 mm	440C Stainless Steel	300 Series Stainless Steel	402.075 lbf	145.125 lbf
SF63800	Open	10 mm	19 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	348 lbf	170 lbf
SF63800ZZ	Shielded	10 mm	19 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	348 lbf	170 lbf
SF63801	Open	12 mm	21 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	388 lbf	210 lbf
SF63801ZZ	Shielded	12 mm	21 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	388 lbf	210 lbf
SF63802	Open	15 mm	24 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	419 lbf	255 lbf
SF63802ZZ	Shielded	15 mm	24 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	419 lbf	255 lbf
SF63803	Open	17 mm	26 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	451 lbf	295 lbf
SF63803ZZ	Shielded	17 mm	26 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	451 lbf	295 lbf
SF63804	Open	20 mm	32 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	812 lbf	498 lbf
SF63804ZZ	Shielded	20 mm	32 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	812 lbf	498 lbf
SF63805	Open	25 mm	37 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	871 lbf	593 lbf
SF63805ZZ	Shielded	25 mm	37 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	871 lbf	593 lbf
SF63806	Open	30 mm	42 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	918 lbf	688 lbf
SF63806ZZ	Shielded	30 mm	42 mm	10 mm	440C Stainless Steel	300 Series Stainless Steel	918 lbf	688 lbf
SF6700	Open	10 mm	15 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	173 lbf	88 lbf
SF6700ZZ	Shielded	10 mm	15 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	173 lbf	88 lbf
SF6701	Open	12 mm	18 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	188 lbf	108 lbf
SF6701ZZ	Shielded	12 mm	18 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	188 lbf	108 lbf
SF6702	Open	15 mm	21 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	190 lbf	118 lbf
SF6702ZZ	Shielded	15 mm	21 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	190 lbf	118 lbf
SF6703	Open	17 mm	23 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	202 lbf	133 lbf
SF6703ZZ	Shielded	17 mm	23 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	202 lbf	133 lbf
SF6704	Open	20 mm	27 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	204 lbf	15 lbf
SF6705	Open	25 mm	32 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	22 lbf	170 lbf
SF6706	Open	30 mm	37 mm	4 mm	440C Stainless Steel	300 Series Stainless Steel	231 lbf	192 lbf
SF679	Open	9 mm	14 mm	3 mm	440C Stainless Steel	300 Series Stainless Steel	158.175 lbf	75.825 lbf
SF679 2rs	Sealed	9 mm	14 mm	4.5 mm	440C Stainless Steel	300 Series Stainless Steel	158.175 lbf	75.825 lbf
SF679zz	Shielded	9 mm	14 mm	4.5 mm	440C Stainless Steel	300 Series Stainless Steel	158.175 lbf	75.825 lbf
SF6800	Open	10 mm	19 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	348 lbf	170 lbf
SF6800ZZ	Shielded	10 mm	19 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	348 lbf	170 lbf
SF6801	Open	12 mm	21 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	388 lbf	210 lbf
SF6801ZZ	Shielded	12 mm	21 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	388 lbf	210 lbf
SF6802	Open	15 mm	24 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	419 lbf	255 lbf
SF6802ZZ	Shielded	15 mm	24 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	419 lbf	255 lbf
SF6803	Open	17 mm	26 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	451 lbf	295 lbf
SF6803ZZ	Shielded	17 mm	26 mm	5 mm	440C Stainless Steel	300 Series Stainless Steel	451 lbf	295 lbf
SF6804	Open	20 mm	32 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	813 lbf	498 lbf
SF6804ZZ	Shielded	20 mm	32 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	813 lbf	498 lbf
SF6805	Open	25 mm	37 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	87 lbf	595 lbf
SF6805ZZ	Shielded	25 mm	37 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	870 lbf	595 lbf
SF6806	Open	30 mm	42 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	900 lbf	696 lbf
SF6806ZZ	Shielded	30 mm	42 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	900 lbf	696 lbf
SF6807	Open	35 mm	47 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	957 lbf	773 lbf
SF6807ZZ	Shielded	35 mm	47 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	957 lbf	773 lbf
SF6808	Open	40 mm	52 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	996 lbf	85 lbf
SF6808ZZ	Shielded	40 mm	52 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	996 lbf	845 lbf
SF6809	Open	45 mm	58 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	1252 lbf	1089 lbf
SF6809ZZ	Shielded	45 mm	58 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	1252 lbf	1089 lbf
SF681	Open	1 mm	3 mm	1 mm	440C Stainless Steel	300 Series Stainless Steel	16.65 lbf	4.275 lbf
SF6810	Open	50 mm	65 mm	7 mm	440C Stainless Steel	300 Series Stainless Steel	1337 lbf	1232 lbf

Application fields of flange bearings

Due to their structure and characteristics, flange bearings are often used in applications requiring higher loads, higher speeds and stricter accuracy requirements. Flange bearings have the characteristics of strong load-bearing capacity, small friction coefficient, high rotation speed, convenient installation, and easy maintenance. They are used in a wide range of fields, including the automotive industry, machinery and equipment, aerospace, power industry, agricultural machinery and other fields.

Aerospace

In the aerospace field, flange bearings are also one of the indispensable components. Flange bearings are required in various aspects such as aero engines, aircraft landing gear, and flight control systems. It has the characteristics of high strength, high precision and high wear resistance, which can ensure the safety and reliability of the aircraft.

Auto industry

Flange bearings are also one of the essential components in the automotive industry. Flange bearings are required in all aspects of automobile engines, transmissions, wheels, etc. It has the characteristics of high load-bearing capacity, high precision and high wear resistance, which can ensure the safety and reliability of the car.

Electrical equipment

In power equipment, flange bearings are also one of the commonly used components. Flange bearings are required in various aspects such as generators, water turbines, and wind turbines. It has the characteristics of high load-bearing capacity, high precision, and high wear resistance, which can ensure the safety and reliability of power equipment.

Metallurgical Industry

In the metallurgical industry, flange bearings are also one of the essential components. In harsh environments such as high temperature, high pressure, and high speed, flange bearings can withstand extreme loads and pressures. Flange bearings are required in various aspects such as metallurgical equipment, steel rolling mills, and high-speed trains.

Mechanical equipment

Flange bearings are widely used in mechanical equipment, such as wind turbines, machine tools, metallurgical equipment, etc. These mechanical equipment usually need to withstand high-speed rotation and large loads, and flange bearings can provide reliable support and load transmission functions.

Electric power industry

Bearings in power generation equipment are required to be able to withstand high-speed rotation and large loads while also having low friction and wear to improve power generation efficiency and extend equipment life. Flange bearings can meet these requirements, so in the power industry Be widely used.

Agricultural machinery

The application of flange bearings in agricultural machinery is mainly concentrated in the transmission systems of agricultural machinery such as agricultural machinery, seeders, and harvesters. They can withstand the load of agricultural machinery during high-speed operation and ensure the normal operation of agricultural machinery.

In addition, there is room for flange bearing products to display technology in everything from printers, fax machines to monitors, and from daily life to general industrial machinery. Under the dimensional and accuracy requirements of standard ABEC-1-7 levels, the flange bearings manufactured by Aubearing can meet the general purpose products. Flange bearings are suitable for various industrial equipment, robots, medical equipment, office equipment, testing instruments, deceleration, transmission, motors, imaging equipment, card readers, electric motors, motors, laser engraving, pressure rotors, dental drills, hard disk motors , stepper motors, fans, pulleys, rollers, transmission equipment, entertainment equipment, precision machinery, power tools and toys, etc.

In short, flange bearings are one of the indispensable mechanical components in various fields, and their wide range of uses and importance are self-evident. With the continuous development and advancement of technology, the performance of flange bearings is also constantly improving, providing strong support for the development of various industries.

Precautions for installation of flange bearings:

Although flange bearings have excellent bearing performance, if they are installed improperly, they will still affect normal operation and shorten their service life. So how to correctly install stainless steel flange bearings? Based on Aubearing’s many years of experience in manufacturing flange bearings, this article summarizes the installation steps and precautions for flange bearings.

Flange bearing installation steps

1. Cleaning: Before installation, the bearings and bearing seats need to be cleaned to ensure that there are no residues on the surface of the parts to avoid affecting the use effect.
2. Apply lubricating oil: Before installation, it is necessary to apply an appropriate amount of lubricating oil inside the bearing and on the bearing seat, which can reduce friction and wear and extend the life of the bearing.
3. Install the bearing: Make sure the bearing is correctly placed on the bearing seat, and then install the top cover.
4. Install the flange: When installing the flange, you need to first align the flange with the bearing, and then tighten it together with the bearing seat fixing screws.
5. Install the sealing ring: Finally, install the sealing ring to prevent dust and impurities from entering the bearing.

Precautions for installation of flange bearings

1. Installation sequence: When installing flange bearings, the correct assembly sequence must be followed, otherwise it will cause performance degradation.
2. Tightness: When installing flange bearings, you need to pay attention to the tightness of the screws. It should not be too tight or too loose. Too tight will affect the normal operation of the bearing, and too loose will easily loosen the screws.
3. Lubrication: When installing flange bearings, be sure to apply an appropriate amount of lubricating oil, which can reduce friction and wear and increase the service life of the bearings.
4. Prevent contamination: When installing flange bearings, it is necessary to try to avoid dust, oil stains and other contaminants from entering the inside of the bearing, otherwise it will cause damage to the bearing or even failure.
5. Correct use: After installing the flange bearing, it needs to be used and maintained correctly, and the lubricating oil should be checked and replaced regularly to ensure its normal operation and extend its service life.

Conclusion

This blog describes in detail the structure, advantages, composition, manufacturing materials, application industries, and installation precautions of flange bearings. I believe you already know some information about flange bearings. If you need flange bearings, please contact Aubearing in time.