Endura-kote Plated Bearings

Kaydon Endurakote® Plated Bearing Design

Kaydon's proprietary Endurakote® hard chrome plating significantly extends the life of thin section bearings and turntable bearings in harsh environments. Endurakote® withstands very high temperatures and does not peel or separate even under high contact stresses. The Endurakote® coating envelops the entire raceway of the bearing, leaving no exposed areas (unlike other commercial chrome or cadmium coatings that cannot withstand rolling contact stresses). Endurakote® is electro-deposited using a proprietary process, ensuring genuine molecular bonding. Stock bearings with AISI 52100 steel coated with Endurakote® exhibit corrosion resistance comparable to AISI 440C stainless steel and have been proven in critical military, aerospace, and deep space applications. In addition to practical applications, salt spray tests also demonstrate the advantages of Endurakote®. The hard and dense surface formed by the coating is highly wear-resistant, and its lubricating film retention is excellent.

Endurakote® Coating Parameters

Endurakote® coating (chromium purity of at least 99%) has a deposition thickness of less than 0.0002 under normal conditions and an equivalent hardness exceeding 70 Rockwell "C". It is compatible with most ferrous and non-ferrous metals, offering maximum flexibility in selecting base materials. The quality of Endurakote® coating remains consistent for any given base metal, ensuring design repeatability. Comprehensive testing procedures indicate that bearings coated with Endurakote® have significantly higher load-carrying capacity and expected life compared to uncoated steel bearings. Endurakote® coating can resist corrosion from most organic and inorganic compounds within the pH range of 4 to 11, excluding sulfuric acid and hydrochloric acid. Bearings with Endurakote® coating can operate within a temperature range of -65°F to 250°F while maintaining stable characteristics. Endurakote® coating features a matte or slightly textured surface with excellent lubricant retention properties, suitable for food processing equipment. The Endurakote® coating does not affect the static or dynamic load capacity of the bearings.

Endura-kote Plated Bearing Types

Types: Angular Contact (A Type), Four Point Contact (X Type), Radial Contact (C Type)

A Type Angular Contact Endura-kote Plated Thin Section Bearings: Suitable for radial or combined radial thrust applications. A Type Endura-kote Plated Thin Section Bearings should never be used solely for supporting moment loads or reverse axial loads. Two A Type Endura-kote Plated Thin Section Bearings are typically used as paired bearings.

Type-X Endura-kote Plated Thin Section Bearings: Also known as 4-point contact Endura-kote bearings, ideal for handling moment loads. Type-X Endura-kote Bearings feature a Gothic arch groove design, creating 4 contact points between the balls and raceways. This design is excellent for withstanding moment loads and reverse axial loads. While Type-X Endura-kote Plated Thin Section Bearings can be used under other light load conditions, they are not recommended to replace Type-C or Type-A Endura-kote Plated Thin Section Bearings for purely radial loads.

C Type Endura-kote Plated Thin Section Bearings: Also known as radial contact Endura-kote Plated thin section bearings, these bearings feature a deep groove design capable of withstanding high loads. While primarily used for radial load applications, they can handle moderate axial loads, reverse axial loads, and moment loads.

Materials

Chrome steel, stainless steel, ceramic hybrids

The catalog lists standard Endura-kote Plated thin section bearings with SAE 52100 steel rings and steel balls. Endurakote bearings can be made from other special bearing steels to provide corrosion resistance, high temperature resistance, alternative load capacities, or chemical compatibility.

Rings

Endura-kote Plated thin section bearings can have the entire surface of the ring coated with Thin Dense Chromium (TDC). This coating meets AMS 2438 standards and ensures molecular bonding that does not peel, flake, or separate from the substrate. TDC plate has a hardness of HRC 70 - 78, capable of withstanding temperatures far beyond the range of the substrate. Some special Endura-kote Plated thin section bearings are made from aluminum, 300 series stainless steel, 17-4 stainless steel, and other metals.

Balls

Some available special ball materials include 440C stainless steel, 300 series stainless steel, silicon nitride, and M-50 steel.

Cage

Cage materials for Endura-kote Plated thin section bearings include brass, nylon, phenolic resin, and stainless steel.

Precision Grade: ABEC-1 to ABEC-7

Endura-kote Plated thin section bearings are available in four precision grades: ABEC 1, 3, 5, and 7. Tolerances for bearing bores, outer diameters, and radial clearances are specified in the product tables.

Sizes

The inner diameter range of Endura-kote Plated thin section bearings is from 0.750 inches to 40.000 inches. The cross-sectional area ranges from .187 x .187 inches to 1.000 x 1.000 inches.

Sealing

Endura-kote Plated thin section bearings listed in the catalog are open bearings, typically lubricated with oil, featuring low starting torque and smooth rotation.

Measurement System

The measurement system for Endura-kote Plated thin section bearings in the product catalog is in inches.

Lubricants

AUB bearings offer a variety of lubricants suitable for special applications, including greases designed for high speed, low torque, water resistance, high temperature, oscillating motion, and food machinery. Other lubricants, such as dry films, are suitable for vacuum and space applications. For more detailed information, refer to the ball bearing lubrication website.

Temperature

Endura-kote Plated thin section bearings made from standard chrome steel can be used continuously at 120°C or intermittently up to 150°C. Above these temperatures, the load capacity of chrome steel decreases. We can also customize Endura-kote Plated thin section bearings for high temperature resistance through special heat treatment processes and by adding high temperature greases.

Internal Clearance

Internal clearance in Endura-kote Plated thin section bearings refers to the clearance between the outer ring, inner ring, and rolling elements. Typically, the amount of movement of the outer ring relative to the fixed inner ring is called radial internal clearance, and the amount of movement in the axial direction is called axial internal clearance. Internal clearance in bearings during operation is a critical factor affecting noise, vibration, heat, and fatigue life, among other factors.