BEARINGDEXCylindrical roller, NJ
NJ211 bearing
55 mm bore, 100 mm outside diameter, 21 mm width (2.1654 × 3.937 × 0.8268 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 55 | 2.1654 |
| Outside diameter D | 100 | 3.9370 |
| Width B | 21 | 0.8268 |
Quick numbers
| Pitch diameter dm | 77.5 mm |
| Section height (D − d)/2 | 22.5 mm |
| n·dm at 1,800 rpm | 139,500 |
| n·dm at 3,600 rpm | 279,000 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
NJCylindrical roller. One rib on the inner ring locates the shaft in one direction.
2Diameter series 2: light
11Bore code 11 × 5 = 55 mm
Same size, different bearing
These share the 55 × 100 × 21 mm envelope but carry load differently. They aren't drop-in swaps.