BEARINGDEXDeep groove ball, thin section
6903 bearing
17 mm bore, 30 mm outside diameter, 7 mm width (0.6693 × 1.1811 × 0.2756 in). SKF numbers it 61903.
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 17 | 0.6693 |
| Outside diameter D | 30 | 1.1811 |
| Width B | 7 | 0.2756 |
Quick numbers
| Pitch diameter dm | 23.5 mm |
| Section height (D − d)/2 | 6.5 mm |
| n·dm at 1,800 rpm | 42,300 |
| n·dm at 3,600 rpm | 84,600 |
Compare against the maker's limiting speed. Speed calculator · L10 life
What the number means
6Deep groove ball, thin section
9Diameter series 9: very thin. 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 | 61903 | 6903 | 6903 | 6903 | 6903 | 6903 |
| Shields both sides | 61903-2Z | 6903-2ZR | 6903ZZ | 6903ZZ | 6903ZZ | 6903ZZE |
| Contact seals both sides | 61903-2RSH | 6903-2RSR | 6903DDU | 6903LLU | 6903-2RS | 6903-2NSE |
| Contact seals both sides, C3 | 61903-2RSH/C3 | 6903-2RSR-C3 | 6903DDUC3 | 6903LLUC3 | 6903-2RSC3 | 6903-2NSE C3 Verify |
| Non-contact seals both sides | 61903-2RSL | 6903-2BRS Verify | 6903VV | 6903LLB | 6903-2RU Verify | 6903-2NKE Verify |
| Shields both sides, C3 | 61903-2Z/C3 | 6903-2ZR-C3 | 6903ZZC3 | 6903ZZC3 | 6903ZZC3 | 6903ZZE C3 Verify |