6203 Bearing
17×40×12 mm
Specifications
Bore (d)
17 mm
OD (D)
40 mm
Width (B)
12 mm
Fillet radius
0.6 mm
Dynamic C
9.55 kN
Static C₀
4.78 kN
Fatigue limit Pᵤ
0.204 kN
Speed (grease)
17,000 rpm
Speed (oil)
22,000 rpm
Weight (open)
0.095 kg
Standard
ISO 15:2017
DIN
DIN 625
Variants (SKF suffix convention)
| Variant | SKF model | Weight (kg) | Description |
|---|---|---|---|
| Open | 6203 | 0.095 | No seals — for clean environments, re-greaseable |
| Rubber sealed (both) | 6203 2RS1 | 0.1 | Maintenance-free, best dust/moisture protection |
| Metal shielded (both) | 6203 Z | 0.097 | Lower torque than 2RS, good dust protection |
Brand Interchange
All brands below manufacture the 6203 to ISO 15:2017 — fully interchangeable on bore, OD, and width.
| Brand | Open | 2RS sealed | ZZ shielded |
|---|---|---|---|
| SKF | 6203 | 6203 2RS1 | 6203 Z |
| FAG | 6203 | 6203 2RS | 6203 Z |
| NSK | 6203 | 6203 2RS | 6203 ZZ |
| NTN | 6203 | 6203 2RS | 6203 ZZ |
| KOYO | 6203 | 6203 2RS | 6203 ZZ |
| NACHI | 6203 | 6203 2NSE9 | 6203 ZZE |
| Timken | 6203 | 6203 2RS | 6203 ZZ |
Chinese Manufacturer Alternatives
Dimensionally interchangeable with SKF/NSK per ISO 15:2017. Indicative FOB price: $0.5–$1.1 USD (MOQ 100 pcs, P0 open).
| Manufacturer | Model | Grade | Tier |
|---|---|---|---|
| ZWZ | 6203 | P0 | Mid-range |
| LYC | 6203 | P0 | Mid-range |
| C&U | 6203 | P0 | Budget |
| HRB | 6203 | P0 | Budget |
Old Chinese GB numbers: 203, 80203
Request Quote from Chinese FactoriesRecommended Fit
Normal load: k6 · Heavy: m6
Stationary: H7 · Rotating: M7
Frequently Asked Questions — 6203 Bearing
What are the dimensions of the 6203 bearing?
The 6203 bearing measures 17mm bore × 40mm outer diameter × 12mm width, with a fillet radius of 0.6mm. This conforms to ISO 15:2017.
What is the load rating of the 6203?
The 6203 has a dynamic load rating (C) of 9.55 kN and a static load rating (C₀) of 4.78 kN. These values are used in ISO 281 L10 life calculations.
What speed can the 6203 run at?
With grease lubrication, the 6203 has a reference speed of 17,000 rpm. With oil lubrication, the limit is 22,000 rpm.
Are SKF, NSK, FAG, and Timken 6203 interchangeable?
Yes. All major bearing brands (SKF, FAG, NSK, NTN, KOYO, NACHI, Timken) produce the 6203 to ISO 15:2017 dimensional standards. They are fully interchangeable on bore, OD, and width dimensions.
What Chinese brands make a 6203 equivalent?
ZWZ, LYC (Luoyang), C&U (Changzhou), and HRB (Harbin) all manufacture 6203 equivalents to ISO 15:2017. Old Chinese GB numbers: 203, 80203. All are dimensionally interchangeable with SKF/NSK.
What is the difference between 6203 open, 6203 2RS, and 6203 ZZ?
Open: no seals, suitable for clean environments with re-lubrication access. 2RS (rubber sealed both sides): maintenance-free, best for dusty or wet environments. ZZ (metal shielded): lower torque than 2RS, good dust protection but not waterproof. For most applications, 2RS is recommended.
What shaft tolerance fits the 6203 bearing?
For a rotating inner ring (most common), use shaft tolerance k6 for normal loads or m6 for heavy loads. For a non-rotating shaft, h6 or js6 is appropriate. Housing bore should be H7 for a stationary outer ring. Use our Bearing Fit Calculator for exact tolerance values.
How do I calculate 6203 bearing life?
L10 = (C/P)³ where C = 9.55 kN (dynamic rating) and P is your applied equivalent load (kN). L10h = L10 × 10⁶ / (60 × n), where n is speed in RPM. Use our Bearing Life Calculator to compute this automatically.