BEARINGDEXCylindrical roller, NJ
NJ312 bearing
60 mm bore, 130 mm outside diameter, 31 mm width (2.3622 × 5.1181 × 1.2205 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 60 | 2.3622 |
| Outside diameter D | 130 | 5.1181 |
| Width B | 31 | 1.2205 |
Quick numbers
| Pitch diameter dm | 95.0 mm |
| Section height (D − d)/2 | 35.0 mm |
| n·dm at 1,800 rpm | 171,000 |
| n·dm at 3,600 rpm | 342,000 |
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.
3Diameter series 3: medium
12Bore code 12 × 5 = 60 mm
Same size, different bearing
These share the 60 × 130 × 31 mm envelope but carry load differently. They aren't drop-in swaps.