Quick Reference
Electric motors and water pumps are essential for South American agriculture and industry. The C3 internal clearance specification is critical for motors running at high temperatures — standard clearance bearings will seize under thermal expansion. These 6 models cover the vast majority of motor and pump applications from 25mm to 40mm shaft diameter.
Why is C3 clearance emphasized on this page?
Because thermal expansion in running motors and pumps can close up standard CN clearance. C3 leaves safe working play after the unit heats up.
Which buyers usually start with this category?
Pump distributors, motor repair shops, irrigation suppliers, and industrial spares traders that already know the core shaft sizes they turn most often.
What should be confirmed before ordering?
Clearance class, seal type, operating temperature, RPM range, and whether the installation uses interference fit or other heat-generating conditions.
Available Models
| Model | d (mm) | D (mm) | B (mm) | Cr | C0r | Weight | Application |
|---|---|---|---|---|---|---|---|
| 6205-2RS C3 | 25 | 52 | 15 | 11.2 kN | 6.55 kN | 0.075 kg | Water pump motor — core model |
| 6206-2RS C3 | 30 | 62 | 16 | 15.3 kN | 10.0 kN | 0.115 kg | Medium motor / water pump |
| 6207-2RS C3 | 35 | 72 | 17 | 20.1 kN | 13.2 kN | 0.160 kg | Larger motor |
| 6208-2RS C3 | 40 | 80 | 18 | 22.9 kN | 15.3 kN | 0.210 kg | Large motor / generator |
| 6307-2RS | 35 | 80 | 21 | 26.5 kN | 17.0 kN | 0.250 kg | High-power water pump |
| 6308-2RS | 40 | 90 | 23 | 32.0 kN | 21.2 kN | 0.340 kg | Heavy-duty motor |
* Cr = Basic Dynamic Load Rating · C0r = Basic Static Load Rating
Why These Bearings
C3 internal clearance — larger gap accommodates thermal expansion in running motors
Prevents premature seizure in motors operating at 60–120°C continuous temperature
2RS rubber seal option keeps grease in and contaminants out in dusty environments
ZZ metal shield option for high-speed applications requiring lower friction
Compatible with standard IEC motor frame sizes — direct drop-in replacement
ISO 9001 certified — batch test reports available on request
Where They're Used
▸Electric Motors
- —IEC standard frame motors (0.37 kW – 30 kW)
- —Single-phase and three-phase motors
- —Fan motors and blower motors
▸Water Pumps
- —Centrifugal water pumps
- —Submersible pump motors
- —Irrigation pump systems
▸Industrial Equipment
- —Compressors
- —Conveyor drive motors
- —Industrial fans and ventilators
Frequently Asked Questions for Motor & Pump Bearings
When should I specify C3 instead of CN?
Use C3 when the motor or pump runs hot, sees long duty cycles, or uses an interference fit that reduces operating clearance after installation.
What are the first motor SKUs most buyers start with?
6205-2RS C3, 6206-2RS C3, and 6207-2RS C3 usually cover the first layer of pump and motor demand.
What documents should I ask for on a pump-bearing order?
Ask for the invoice, packing list, model list, and if needed a note on clearance class, grease, or inspection support for your technical team.
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