Miniature Bearing

Miniature Ball Bearings (also known as small ball bearings or mini bearings) provide precision motion and load handling in compact applications while reducing friction. Small bearings primarily support radial loads and can withstand minor axial loads. They are suitable for applications requiring high speed, low friction torque, low vibration, and low noise, such as in medical equipment, dental equipment, aerospace, automotive, and motor industries. AUBEARING manufactures miniature bearings with outer diameters ranging from 1 mm to 30 mm. These bearings consist of an outer ring, an inner ring, a ball set, and a retainer. Based on their characteristics, miniature bearings can be categorized into flanged miniature bearings, miniature bearings with extended inner or outer rings, and miniature thrust ball bearings. According to the size standards, they can be divided into metric and inch types.

Inch Standard

Inch-sized miniature ball bearings are single-row ball bearings. The inner diameters of AUBEARING’s inch-sized miniature bearings range from 0.0400 inches to 0.375 inches. They can also be custom-manufactured based on your 3D drawings. These inch-sized miniature ball bearings are designed to handle moderate radial and thrust loads with low torque. The inch series bearings are available in materials such as stainless steel, chrome steel, and ceramic, and come in open, sealed, and shielded configurations. They also offer options with or without flanges. The precision grades of AUBEARING’s inch-sized miniature ball bearings range from ABEC1 to ABEC9. MOQ=1. For most inch-sized miniature bearings, AUBEARING can ship the same day you place your order.

Inch Extended

These bearings are specifically designed for special applications. Miniature bearings with an extended inner ring feature a longer inner ring, eliminating the need for spacers or washers. Typically, extended inner ring miniature ball bearings or wide inner ring bearings are specifically designed to replace applications requiring additional positioning flanges. AUBEARING offers a full range of extended inner ring miniature ball bearings, available in open, shielded, or rubber-sealed versions, and can provide grades from ABEC-1 to ABEC-7 upon request. They are widely used in medical equipment, cryogenic engineering, optical instruments, high-speed machine tools, high-speed motors, printing machinery, and food processing machinery.MOQ=1.

Inch Flanged

Micro flanged ball bearings typically refer to small bearings and are a type of miniature deep groove ball bearing. The outer ring of a flanged miniature bearing has a solid steel flange, making it easier to locate the bearing in a housing. The flange also helps prevent axial movement of the bearing when subjected to thrust loads. In applications with significant vibration, the flange aids in maintaining the position of the bearing. Flanged bearings are also used in cases where the bearing housing is made of a different material that may expand more than the bearing outer ring at higher temperatures.

Inch Flanged Extended

Flange Extended Inner Ring Miniature Ball Bearings, also known as Flange extended inner miniature ring bearing or flange wide inner ring miniature ball bearings, is a kind of extended inner ring ball miniature bearing with ribs. AUB has full size flanged extended inner ring ball bearings available in SAE52100 chrome steel but more commonly in AISI440C stainless steel for heavy radial loads and moderate bi-directional thrust loads.

Metric Standard

Metric miniature bearings are single row deep groove ball bearings with bore diameters ranging from 1 mm to 10 mm. These bearings are constructed so that they can accommodate moderate radial and thrust loads and operate at high speeds. The types of miniature deep groove ball bearings include metric 68 series, 69 series, 60 series, etc. On this basis, they can also be divided into bearings with ZZ steel shields, miniature bearings with RS rubber seals, and Teflon bearings. Sealed ring bearing series and flange rib series, etc. AUB also accepts customized miniature bearings according to customer requirements.

Metric Flanged

Metric Miniature Flanged Ball Bearings are single row ball bearings available from 1mm through 9mm bore sizes. Metric flanged ball bearings have a solid steel flange on the outer ring. This allows the metric flanged bearing to be more easily located in a housing. enables easy positioning in the axial direction when mounting to the housing.

Miniature Thrust Bearings

AUBEARING specializes in manufacturing miniature thrust ball bearings, capable of producing metric series bearings with minimum inner diameters of 2.0 mm, featuring flat raceways, and 3.0 mm, with groove raceways. Their outer diameters are 6.0 mm and 8.0 mm respectively. These thrust bearings come with flat washers of the same dimensions, designed for low-speed applications. Additionally, the load capacity of flat washer miniature thrust bearings is significantly lower compared to those with groove washers.

AUBEARING Miniature Bearings include metric, inch, standard, flanged, open, sealed, shielded, chrome steel, stainless steel, ceramic, and plastic bearings, as well as a range of miniature thrust ball bearings. These miniature bearings rotate at high speeds with minimal vibration or noise and are widely used in remote-controlled models, gyroscopes, miniature gearboxes, small motors, instruments, dental equipment, vacuum cleaners, skateboards, fishing rod reels, and more. With such a vast range of applications, AUBEARING maintains a stock of nearly 1,000,000+ miniature bearings, covering thousands of different types. As a recognized leader in the manufacture of precision ball bearings and other medium to large bearings, AUBEARING's catalog details all sizes and varieties offered. Metric sizes have an inner diameter as small as 1.0 mm, and inch sizes have an inner diameter as small as 0.04 inches. Here, you can find the ideal miniature bearings in terms of size, weight, and speed to help you make the right choice for your application.

Materials for Miniature Bearings Chrome steel is the most commonly used material for miniature ball bearings due to its high load capacity and good low-noise characteristics. Chrome steel bearings are also more cost-effective. However, many miniature bearings are made from stainless steel because they are not typically used in high-load applications and require only a small amount of steel. The cost difference between stainless steel miniature bearings and chrome steel miniature bearings is negligible. Chrome steel bearings with steel retainers and appropriate lubricants can be used at constant temperatures of up to 120°C or intermittent temperatures of up to 150°C. Beyond these temperatures, the load capacity of chrome steel decreases, and the dimensional changes are greater compared to stainless steel.

Seals and Shields for Miniature Bearings Most chrome steel miniature bearings from AUBEARING are available in open, metal shielded (Z or ZZ), or sealed forms. Bearings with rubber or PTFE contact seals (RS or 2RS) or low-friction non-contact rubber seals (RZ or 2RZ) are suitable for larger sizes of miniature bearings. Open bearings use lightweight oil lubrication. Shielded or sealed bearings typically come with grease lubrication. Shielded miniature bearings are suitable for low-speed, low-friction applications. Thanks to our in-house relubrication facilities, miniature bearings are lubricated with oil, grease, or dry lubricants as specified by you.

AUBEARING Miniature Ball Bearing Solutions

On request, AUBEARING also provides various grades of Abec precision miniature bearings, including Abec 5, 7, and 9, designed to meet the needs of various industrial, commercial, and consumer applications. Our miniature bearings are available in a variety of sizes, styles, and materials, including stainless steel, chrome steel, and ceramic, as well as flanged, extended inner ring, and miniature thrust ball bearings to meet your specific requirements. AUB consistently provides high-quality precision miniature ball bearings for various industrial, scientific, and commercial applications. Our miniature ball bearings are available in both metric and inch sizes and are known for their extremely low friction rotation performance. We have perfected the manufacturing process of miniature ball bearings, maintaining the highest quality standards. Consequently, our precision miniature bearings have the exact characteristics required for lasting performance. Contact our team today for more details on precision miniature ball bearings or to request a quote.