This is a top - notch 6902 bearing. It offers high - performance features suitable for precision equipment.

- Grade 5 Chromium Steel Balls: These high - precision balls are incredibly round, within 5/1,000,000' round. They meet military - level specifications, with an R - 64 hardness, the highest grade available.
- 52100 High Carbon Chromium Alloy Races: The races are made through a vacuum de - gassing process to get the purest chromium alloy steel. Hardened to R - 62, they are tough and durable. Their mirror - polished finish ensures ABEC - 5 precision and noiseless movement.
- Graphite/Nylon Ball Retainers: The nylon with graphite retainers offer near - zero friction and constant lubrication.

The ABEC 5 Standard: To reach the ABEC - 5 standard, this bearing has passed all the tests, including high - RPM noise testing, and has extremely tight tolerances for ID and OD, ball roundness, race trueness, and micro - surface finishes of balls and races.

C - 3 Clearance: This specification defines the internal clearance between the bearing and its race. For a 10 - 18 ID bearing, our standard is 11 - 21 micrometers, more precise than the common 11 - 25 micrometers.

Enduro LLB Type Seals: Our popular LLB type seals are made of nitrile rubber with a steel insert. Unlike the standard 2RS type, we machine a groove in the inner race. This allows the seal to rotate more efficiently with less rolling resistance. Two razor - thin sealing lips in the groove have light contact. The outer lip keeps water and contaminants out, while the inner seal retains grease for smooth operation and long service intervals.

Using this Enduro bearing is straightforward. Just install it in your precision equipment according to the correct procedure. When handling, make sure your hands are clean to avoid getting dirt or debris into the bearing. For maintenance, regularly check the LLB type seals. If they are damaged or worn, replace them promptly. Keep the bearing lubricated with the appropriate grease. When storing the bearing, place it in a dry and clean environment to prevent corrosion. Also, avoid subjecting the bearing to excessive shock or vibration during use, as this can affect its performance and lifespan.