BEARINGDEXDeep groove ball
6305 bearing
25 mm bore, 62 mm outside diameter, 17 mm width (0.9843 × 2.4409 × 0.6693 in).
Dimensions
| mm | inch | |
|---|---|---|
| Bore d | 25 | 0.9843 |
| Outside diameter D | 62 | 2.4409 |
| Width B | 17 | 0.6693 |
Quick numbers
| Pitch diameter dm | 43.5 mm |
| Section height (D − d)/2 | 18.5 mm |
| n·dm at 1,800 rpm | 78,300 |
| n·dm at 3,600 rpm | 156,600 |
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.
05Bore code 05 × 5 = 25 mm
How each brand writes it
Same bearing, every maker's notation| Version | SKF | FAG | NSK | NTN | Koyo | NACHI |
|---|---|---|---|---|---|---|
| Open | 6305 | 6305 | 6305 | 6305 | 6305 | 6305 |
| Shields both sides | 6305-2Z | 6305-2ZR | 6305ZZ | 6305ZZ | 6305ZZ | 6305ZZE |
| Contact seals both sides | 6305-2RSH | 6305-2RSR | 6305DDU | 6305LLU | 6305-2RS | 6305-2NSE |
| Contact seals both sides, C3 | 6305-2RSH/C3 | 6305-2RSR-C3 | 6305DDUC3 | 6305LLUC3 | 6305-2RSC3 | 6305-2NSE C3 Verify |
| Non-contact seals both sides | 6305-2RSL | 6305-2BRS Verify | 6305VV | 6305LLB | 6305-2RU Verify | 6305-2NKE Verify |
| Shields both sides, C3 | 6305-2Z/C3 | 6305-2ZR-C3 | 6305ZZC3 | 6305ZZC3 | 6305ZZC3 | 6305ZZE C3 Verify |
Same size, different bearing
These share the 25 × 62 × 17 mm envelope but carry load differently. They aren't drop-in swaps.