6203 Open Deep Groove Ball Bearing
6203 is a open single-row bearing with a 17 mm bore, 40 mm outside diameter, and 12 mm width. Request a bulk quote with your quantity, destination, and required suffix.
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| mm | in (≈) | |
|---|---|---|
| Bore | 17 | 0.669 |
| Outside diameter | 40 | 1.575 |
| Width | 12 | 0.472 |
| Closure | Open | |
Manufacturer reference data
The Timken catalog lists a reference mass of 70 g for its standard 6203. Use the datasheet for the exact brand and suffix in your quote.
6203 bearing dimensional tolerances
The 17 × 40 × 12 mm dimensions are nominal. Inch values are rounded conversions. Use the manufacturer’s tolerance table for the quoted precision class when checking bore, outside diameter, width or runout. Include the required class and complete part marking in the RFQ.
6203 vs. 6203-2RS vs. 6203-ZZ
All three reference versions share the same nominal dimensions. The plain 6203 is open, 2RS adds contact seals on both sides in the Timken nomenclature, and ZZ adds metal shields on both sides. Match the original closure and lubrication requirements before approving a substitution.
Can a 6303 replace a 6203?
Both reference sizes have a 17 mm bore. The 6303 measures 17 × 47 × 14 mm, so it requires a different housing diameter and axial space. Check the housing bore and shoulder spacing as well as the shaft diameter.
For an open 6203, tell the supplier whether the assembly supplies oil or grease and whether the bearing is enclosed in service. If your drawing specifies a brand or clearance, include the complete marking. For equivalent parts, list the accepted brands and any required inspection documents.
| 6203-2RS | Contact seals on both sides |
|---|---|
| 6203-ZZ | Shields on both sides |
| Part number | Bore × Outside diameter × Width |
|---|---|
| 6003 | 17 × 35 × 10 mm |
| 6303 | 17 × 47 × 14 mm |