BEARINGDEXDeep groove ball
6203 bearing
17 mm bore, 40 mm outside diameter, 12 mm width (0.6693 × 1.5748 × 0.4724 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 17 | 0.6693 |
| Outside diameter D | 40 | 1.5748 |
| Width B | 12 | 0.4724 |
Quick numbers
| Pitch diameter dm | 28.5 mm |
| Section height (D − d)/2 | 11.5 mm |
| n·dm at 1,800 rpm | 51,300 |
| n·dm at 3,600 rpm | 102,600 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
6Deep groove ball
2Diameter series 2: light. 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 | 6203 | 6203 | 6203 | 6203 | 6203 | 6203 |
| Shields both sides | 6203-2Z | 6203-2ZR | 6203ZZ | 6203ZZ | 6203ZZ | 6203ZZE |
| Contact seals both sides | 6203-2RSH | 6203-2RSR | 6203DDU | 6203LLU | 6203-2RS | 6203-2NSE |
| Contact seals both sides, C3 | 6203-2RSH/C3 | 6203-2RSR-C3 | 6203DDUC3 | 6203LLUC3 | 6203-2RSC3 | 6203-2NSE C3 Verify |
| Non-contact seals both sides | 6203-2RSL | 6203-2BRS Verify | 6203VV | 6203LLB | 6203-2RU Verify | 6203-2NKE Verify |
| Shields both sides, C3 | 6203-2Z/C3 | 6203-2ZR-C3 | 6203ZZC3 | 6203ZZC3 | 6203ZZC3 | 6203ZZE C3 Verify |
Same size, different bearing
These share the 17 × 40 × 12 mm envelope but carry load differently. They aren't drop-in swaps.