The S99NH2MBN1212 is a caged needle roller bearing designed for use on hardened shafts from 3 mm to 25 mm, with a 12 mm shaft diameter, 18 mm outer diameter, and 12 mm face width. It supports a dynamic load capacity of 6499 N and a static load capacity of 7300 N, with a maximum speed of 20000 rpm when oil-lubricated. The roller cup is made of case-hardened steel, the needles of 52100 hardened chrome steel, and the cage of low carbon steel. Shaft surface hardness must be HRC 58 minimum, and the housing bore tolerance is N6 for steel or cast iron. The bearing features low rolling friction, high lubrication capacity, and low sensitivity to misalignment.
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 | S99NH2MBN1212 |
| Product Name | Mount Bearing on Hardened Shaft or Use Hardened Inner Race |
| Application | Aerospace |
| Design Units | Metric |
| Bore | 0.4724 inch (12.000 mm) |
