The S99RH2MBNR2025 is a hardened inner race for needle roller bearings, designed for mounting on soft shafts. It has a bore diameter of 20 mm and an outer diameter of 25 mm, with material hardened to HRC 58 minimum and an O.D. ground to 0.40 µm Ra surface roughness. Recommended shaft fit tolerance is k6, and all corners are chamfered for ease of assembly. The part is available as part of a series with matching needle roller bearings.
A bearing is a device that reduces friction between moving components by preventing metal-to-metal contact while assisting components (shafts, axles, and wheels) to freely rotate around a fixed axis, cutting down on heat generation and the amount of energy that is consumed. By replacing sliding motion with low-friction rolling motion, the life of the rotating components is increased. A bearing also keeps the shaft in the proper position, providing support and alignment and transferring the axial or radial loads to the housing.
The types of bearings that we offer include rolling element bearings, which consist of both ball bearings and roller bearings.
Balls are utilized as the rolling element in ball bearings; a retainer holds the balls in place and allows them to freely rotate. The balls are kept inside channels cut in both the inner and outer races. Because there is no surface contact between the balls and races, precision ball bearings have a lower load capacity for their size than other bearings.
| Stock Drive Products & Sterling Instrument - SDP/SI | |
|---|---|
| Product Category | Needle Roller Bearings |
| Product Number | S99RH2MBNR2025 |
| Product Name | Hardened and Grounded Inner Race for Mounting Needle Roller Bearing |
| Application | Aerospace |
