6309 bearing: 45 × 100 × 25 mm
Bearings › 6309
A 6309 is a deep groove ball bearing, 45 mm bore, 100 mm outside diameter, 25 mm wide. Variants: 6309-2RS (rubber sealed), 6309-ZZ (metal shields), 6309 open.
| Bore | 45 mm |
|---|---|
| Outside diameter (OD) | 100 mm |
| Width | 25 mm |
| Dynamic load rating C | 55.3 kN |
| Static load rating C0 | 31.5 kN |
| Limiting speed | 9 500 r/min |
| Weight | 0.817 kg |
Ratings and weight: SKF product page, skf.com, read 2 Oct 2026, designation 6309. Limiting speed as SKF gives it.
Open 6309 in BenchsmithAdd to order list
What the number means
6 | Deep groove ball bearing |
3 | Medium series |
09 | Bore 09 × 5 = 45 mm |
Ask for
- 6309-2RS: rubber sealed both sides. Other brands: SKF 6309-2RSH, FAG 6309-2RSR, NSK 6309DDU, NTN 6309LLU, Koyo 6309-2RS.
- 6309-ZZ: metal shields both sides. Other brands: SKF 6309-2Z, FAG 6309-2ZR, NSK 6309ZZ, NTN 6309ZZ, Koyo 6309ZZ.
- 6309: 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 45 × 100 × 25 mm: 45 × 100 × 25 mm bearings. Measured a bearing with no number on it? Type the bore, OD and width into Benchsmith → Find → Bearing.