Metrology Center

Professional bearing knowledge — helping you select and maintain bearings correctly

Bearing Selection Guide

Choose the right bearing based on your application

🔧 Water Pump Bearings

Application: Automotive engine cooling water pumps.
Key Parameters: Shaft diameter, outer diameter, total length, seal type, rated speed.
Note: Consider coolant temperature and pressure.

⚙️ Deep Groove Ball Bearings

Application: Motors, pumps, fans, agricultural machinery, conveyors.
Key Parameters: Bore diameter, outer diameter, width, load rating, speed limit, clearance (C0/C3).

🔄 One-Way Bearings

Application: Washing machines, starter motors, textile machinery.
Key Parameters: Bore diameter, outer diameter, rated torque, maximum speed.
Note: Verify locking direction during installation.

Selection by Working Conditions

Match bearings to your specific operating environment

⚡ High Speed

Use high-precision grades (P5/P4), small clearance, high-temperature grease. Consider speed limits.

🏋️ Heavy Load

Use larger series, full-complement roller structure, or cylindrical roller bearings. Verify load safety factors.

🔥 High Temperature (>120°C)

Use high-temperature steel, large clearance (C3/C4), high-temp grease. Check seal material rating.

💧 Dusty / Wet

Use contact rubber seals (2RS/2RZ) with waterproof grease. Consider stainless steel for corrosive areas.

🔇 Low Noise

Use low-noise grades (Z1/Z2/Z3) with super-finished raceways and premium low-noise grease.

🎯 High Precision

Use P5 or higher precision grades with appropriate shaft and housing tolerances.

Technical Articles

Knowledge, installation guides, and troubleshooting

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Bearing Basics

Structure and Applications of Deep Groove Ball Bearings

Comprehensive introduction to the most widely used bearing type — from structural design to typical applications.

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Water Pump Bearing

Water Pump Bearing Selection and Common Failures

Key parameters for selection and analysis of common failures like leakage and abnormal noise.

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Installation

Proper Bearing Installation — Cold and Hot Mounting

Incorrect installation is a leading cause of premature failure. Learn proper mounting techniques.

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One-Way Bearing

One-Way Bearing Working Principle and Installation

Understanding wedge and roller type one-way bearings, and determining correct locking direction.

FAQ

Frequently asked questions — quick answers

How to identify counterfeit bearings?

Check packaging quality, surface finish, laser marking clarity, rotation feel, and price. Always buy from reputable suppliers. We guarantee genuine bearings with full traceability.

How to determine one-way bearing installation direction?

Most one-way bearings have an arrow marking on the end face. Test manually: one direction rotates freely, the opposite locks. Ensure locking direction matches your application.

What causes bearing noise and how to fix it?

Five main causes: poor lubrication (re-grease), foreign matter (clean and re-seal), improper installation (check fits), fatigue spalling (replace), improper clearance (select correct grade).

How to choose the right bearing grease?

Consider working temperature (dropping point 30-50°C above max temp), speed (low viscosity for high speed), load (high viscosity with EP additives), and environment (water-resistant for wet conditions).

How is bearing life calculated?

Based on ISO 281: L10 = (C/P)^p × 10^6 revolutions, where C = dynamic load rating, P = equivalent load, p = 3 for ball bearings. Contact us for detailed calculations.

How to select water pump bearings?

Key parameters: shaft diameter (15-35mm), outer diameter, total length, seal type, rated speed. Provide your water pump model and we’ll help match the right bearing.

Have a Technical Question?

Our engineering team provides professional support — from selection to troubleshooting

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