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The 6203 is a compact 6200-series bearing with a simple structure consisting of an inner ring, outer ring, steel balls and a cage. Its standardized 17 × 40 × 12 mm dimensions make it suitable for electric motors, pumps, fans, conveyors, agricultural machinery, industrial equipment and other general-purpose rotating applications.
The 6203 deep groove ball bearing is a standard 6200-series bearing designed for applications requiring a compact bearing with reliable radial load capacity and high-speed operation. The following specifications are based on the CXJSD 6203 configuration.
| Parameter | 6203 Bearing | Unit |
|---|---|---|
| Bearing Number | 6203 | — |
| Bore diameter (d) | 17 mm | mm |
| Outside diameter (D) | 40 mm | mm |
| Width (B) | 12 mm | mm |
| Minimum chamfer (r) | 0.6 mm | mm |
| Dynamic load rating (Cr) | 9.6 kN | kN |
| Static load rating (Cor) | 4.6 kN | kN |
| Number of balls | 8 | pcs |
| Ball diameter | 6.747 mm | mm |
| Grease lubrication speed rating | 18,000 r/min | rpm |
| Oil lubrication speed rating | 21,000 r/min | rpm |
| Weight | 0.066 kg/pc | kg/pc |
The 6203 deep groove ball bearing uses four primary components: an outer ring, steel balls, a cage and an inner ring. Together, these components provide smooth rotation, low friction and reliable support for rotating shafts.
Provides the outer raceway that guides and supports the steel balls during rotation.
Transfer loads between the inner and outer rings while reducing friction during rotation.
Keeps the steel balls evenly spaced and guides them smoothly around the bearing.
Provides the inner raceway for the steel balls and mounts onto the 17 mm shaft.
Has no shields or seals, providing low running resistance and allowing external lubrication where the application requires it.
Two metal shields help retain factory grease and reduce the entry of dust and coarse contaminants with relatively low added friction.
Two rubber seals provide stronger protection against moisture and fine contaminants and are suitable for more demanding operating environments.
With a compact 17 × 40 × 12 mm size, reliable radial load capacity and high-speed capability, the 6203 is widely suitable for general-purpose rotating equipment and replacement bearing applications.
Supports motor and generator shafts, reduces friction during rotation and helps maintain smooth operation.
Supports rotating shafts and impellers while handling radial and moderate axial loads during continuous operation.
Supports fan shafts and enables smooth, low-friction rotation in ventilation and air-moving equipment.
Supports conveyor rollers and rotating shafts for reliable continuous movement under moderate loads.
Supports rotating components in tractors, irrigation equipment and other continuously operating agricultural machinery.
Verified feedback from procurement teams and distributors who have ordered this part — shown as submitted, with supplier replies where given.
Really happy with how smoothly these bearings run. We put them into our equipment and the operation feels noticeably quieter. They have been running consistently without giving us any trouble so far.
We bought these as replacements for some worn bearings and the whole process was pretty straightforward. They went in without any issues and the equipment was back up and running quickly. A simple product that does the job well.
What I like most is the sealing performance. We needed something that could handle a dusty working environment, and these have been a good choice. They feel well made and have given us fewer issues with contamination.
So far, these have been holding up very well in our pump equipment. The running is smooth and we haven't noticed any unusual noise or vibration. For the price, I think they offer very good value.
We were looking for a dependable bearing that we could keep in regular stock, and these have worked out nicely. The quality has been consistent from one order to the next, which makes purchasing much easier for us.
Technical videos covering 6203 bearing tolerance, general specifications and the difference between 6203ZZ and 6203-2RS configurations.
Answers to common questions about 6203 bearing dimensions, sealing options, load capacity, speed and applications.
The 6203 is a single-row deep groove ball bearing in the 6200 series. Its standard dimensions are 17 mm bore, 40 mm outside diameter and 12 mm width. It is designed primarily for radial loads and can also accommodate moderate axial loads in both directions, making it suitable for motors, pumps, fans, conveyors and other rotating equipment.
The standard 6203 bearing dimensions are 17 mm bore × 40 mm outside diameter × 12 mm width. The minimum chamfer is 0.6 mm. Buyers should confirm the shaft diameter, housing bore and available bearing width before ordering replacement bearings.
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The basic bearing dimensions are the same, but the sealing configuration is different. A 6203-2RS uses two rubber seals for stronger protection against dust and moisture, while a 6203-ZZ uses two metal shields and generally provides lower sealing resistance. An open 6203 has no seals or shields and is suitable where external protection and lubrication are provided separately.
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Load capacity depends on the manufacturer, material, internal design, clearance and bearing configuration. CXJSD lists its 6203 with a dynamic load rating of 9.6 kN and a static load rating of 4.6 kN. For actual equipment selection, buyers should use the manufacturer's specified load ratings rather than relying only on the 6203 designation.
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Allowable speed depends on bearing design, seal type, lubrication, temperature and precision grade. CXJSD lists its standard 6203 with a grease lubrication speed rating of 18,000 r/min and an oil lubrication speed rating of 21,000 r/min. For high-speed applications, the selected seal, lubricant, clearance and operating temperature should be checked against the manufacturer's specifications.
