BEARINGDEXCylindrical roller, NJ
NJ303 bearing
17 mm bore, 47 mm outside diameter, 14 mm width (0.6693 × 1.8504 × 0.5512 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 17 | 0.6693 |
| Outside diameter D | 47 | 1.8504 |
| Width B | 14 | 0.5512 |
Quick numbers
| Pitch diameter dm | 32.0 mm |
| Section height (D − d)/2 | 15.0 mm |
| n·dm at 1,800 rpm | 57,600 |
| n·dm at 3,600 rpm | 115,200 |
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
03Bore code 03 is a fixed code for 17 mm
Same size, different bearing
These share the 17 × 47 × 14 mm envelope but carry load differently. They aren't drop-in swaps.