BEARINGDEXDeep groove ball
6303 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
6Deep groove ball
3Diameter series 3: medium. Width series 0 is implied and left off.
03Bore code 03 is a fixed code for 17 mm
How each brand writes it
Same bearing, every maker's notation| Version | SKF | FAG | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|
| Open | 6303 | 6303 | 6303 | 6303 | 6303 | 6303 |
| Shields both sides | 6303-2Z | 6303-2ZR | 6303ZZ | 6303ZZ | 6303ZZ | 6303ZZE |
| Contact seals both sides | 6303-2RSH | 6303-2RSR | 6303DDU | 6303LLU | 6303-2RS | 6303-2NSE |
| Contact seals both sides, C3 | 6303-2RSH/C3 | 6303-2RSR-C3 | 6303DDUC3 | 6303LLUC3 | 6303-2RSC3 | 6303-2NSE C3 Verify |
| Non-contact seals both sides | 6303-2RSL | 6303-2BRS Verify | 6303VV | 6303LLB | 6303-2RU Verify | 6303-2NKE Verify |
| Shields both sides, C3 | 6303-2Z/C3 | 6303-2ZR-C3 | 6303ZZC3 | 6303ZZC3 | 6303ZZC3 | 6303ZZE C3 Verify |
Same size, different bearing
These share the 17 × 47 × 14 mm envelope but carry load differently. They aren't drop-in swaps.