6203 bearing: 17 × 40 × 12 mm
Bearings › 6203
A 6203 is a deep groove ball bearing, 17 mm bore, 40 mm outside diameter, 12 mm wide. Variants: 6203-2RS (rubber sealed), 6203-ZZ (metal shields), 6203 open.
| Bore | 17 mm |
|---|---|
| Outside diameter (OD) | 40 mm |
| Width | 12 mm |
| Dynamic load rating C | 9.95 kN |
| Static load rating C0 | 4.75 kN |
| Limiting speed | 24 000 r/min |
| Weight | 0.062 kg |
Ratings and weight: SKF product page, skf.com, read 2 Oct 2026, designation 6203. Limiting speed as SKF gives it.
Open 6203 in BenchsmithAdd to order list
What the number means
6 | Deep groove ball bearing |
2 | Light series |
03 | Bore code 03 = 17 mm |
Ask for
- 6203-2RS: rubber sealed both sides. Other brands: SKF 6203-2RSH, FAG 6203-2RSR, NSK 6203DDU, NTN 6203LLU, Koyo 6203-2RS.
- 6203-ZZ: metal shields both sides. Other brands: SKF 6203-2Z, FAG 6203-2ZR, NSK 6203ZZ, NTN 6203ZZ, Koyo 6203ZZ.
- 6203: open, no seals or shields.
Add C3 for electric motors and anything that runs hot.
About the 62 series
The workhorse. Electric motors, pumps, gearboxes, conveyor rollers, anything with a moderate load and real speed. If you pull a bearing off a motor and it's metric, it's probably a 62 or a 63.
2RS keeps dirt out and grease in, but runs warmer and slower. ZZ shields run cooler but let fine dust through. Dirty or wet: 2RS. Fast and clean: ZZ or open with oil.
Motors usually want C3 clearance. The rotor heats up and grows; a CN bearing can run tight and die early.
Same bore, different size
Same size, different type
One size up or down
Every bearing 17 × 40 × 12 mm: 17 × 40 × 12 mm bearings. Measured a bearing with no number on it? Type the bore, OD and width into Benchsmith → Find → Bearing.