6308 bearing: 40 × 90 × 23 mm
Bearings › 6308
A 6308 is a deep groove ball bearing, 40 mm bore, 90 mm outside diameter, 23 mm wide. Variants: 6308-2RS (rubber sealed), 6308-ZZ (metal shields), 6308 open.
| Bore | 40 mm |
|---|---|
| Outside diameter (OD) | 90 mm |
| Width | 23 mm |
| Dynamic load rating C | 42.3 kN |
| Static load rating C0 | 24 kN |
| Limiting speed | 11 000 r/min |
| Weight | 0.611 kg |
Ratings and weight: SKF product page, skf.com, read 2 Oct 2026, designation 6308. Limiting speed as SKF gives it.
Open 6308 in BenchsmithAdd to order list
What the number means
6 | Deep groove ball bearing |
3 | Medium series |
08 | Bore 08 × 5 = 40 mm |
Ask for
- 6308-2RS: rubber sealed both sides. Other brands: SKF 6308-2RSH, FAG 6308-2RSR, NSK 6308DDU, NTN 6308LLU, Koyo 6308-2RS.
- 6308-ZZ: metal shields both sides. Other brands: SKF 6308-2Z, FAG 6308-2ZR, NSK 6308ZZ, NTN 6308ZZ, Koyo 6308ZZ.
- 6308: open, no seals or shields.
Add C3 for electric motors and anything that runs hot.
About the 63 series
Same bore as the 62, but a bigger OD and wider. Heavier load, same shaft. You'll find them in pumps, compressors and the drive end of bigger motors.
If a 62 keeps failing and the housing has room, a 63 is the usual upgrade. Check the housing bore first; it won't fit a 62's seat.
Same bore, different size
One size up or down
Every bearing 40 × 90 × 23 mm: 40 × 90 × 23 mm bearings. Measured a bearing with no number on it? Type the bore, OD and width into Benchsmith → Find → Bearing.