BEARINGDEXCylindrical roller, NJ
NJ220 bearing
100 mm bore, 180 mm outside diameter, 34 mm width (3.937 × 7.0866 × 1.3386 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 100 | 3.9370 |
| Outside diameter D | 180 | 7.0866 |
| Width B | 34 | 1.3386 |
Quick numbers
| Pitch diameter dm | 140.0 mm |
| Section height (D − d)/2 | 40.0 mm |
| n·dm at 1,800 rpm | 252,000 |
| n·dm at 3,600 rpm | 504,000 |
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
20Bore code 20 × 5 = 100 mm
Same size, different bearing
These share the 100 × 180 × 34 mm envelope but carry load differently. They aren't drop-in swaps.