Features:
Needle roller bearings use very long and thin cylinders. Often the ends of the rollers taper to points, and these are used to keep the rollers captive, or they may be hemispherical and not captive but held by the shaft itself or a similar arrangement. Since the rollers are thin, the outside diameter of the bearing is only slightly larger than the hole in the middle. However, the small-diameter rollers must bend sharply where they contact the races, and thus the bearing fatigues relatively quickly.
Needle roller bearings include bearings whose rollers slightly exceed the size range of needle rollers as stipulated by ISO. Needle roller bearings include drawn cup and solid radial bearings, as well as application-specific cam followers, and roller followers. Thrust bearings include thrust needle bearings.
Needle roller bearings feature a smaller cross-section, higher load-carrying capacity, greater rigidity, and lower inertia forces that facilitate size and weight reductions in machinery. They’re designed to withstand oscillation, perform under severe conditions, and interchange with sliding bearings.
Parameter:
| Series | Explanation |
|---|---|
| NK | Non- inner ring needle bearing, light series |
| NKS | Non- inner ring needle bearing, heavyseries |
| RNA 49 | Non- inner ring needle bearing, size series 49 |
| RNA 69 | Non- inner ring needle bearing, size series 69,Pair Row (Odd Row to RNA 6906) |
| RNA 48 | Non- inner ring needle bearing, size series 48 |
| NKI | with Inner ring needle bearing, light series |
| NKIS | with Inner ring needle bearing, heavy series |
| NA 49 | inner ring needle bearing, size series 48 |
| NA 69 | Non- inner ring needle bearing, size series 48,Pair Row (Odd Row to NA 6906) |
| NA 48 | with Inner ring needle bearing, size series48 |
| RNA 49..RS | with out Inner ring needle bearing,Directly Seal ,Size series 49 |
| RNA 49..2RS | with out Inner ring needle bearing,One-sided seal ,Size series 49 |
| NA 49..RS | with Inner ring needle bearing,Directly Seal ,Size series 49 |
| NA 49..2RS | with Inner ring needle bearing,Two-sided seal ,Size series 49 |