1. Product Introduction

The 6203-RS is a single-row deep groove ball bearing fitted with double-sided RS rubber contact seals, engineered for medium-speed duty where dependable waterproof and dust-proof protection is required. It is produced from high-purity GCr15 bearing steel, hardened through controlled quenching and tempering, and finished with precision-ground raceways and steel balls. The RS rubber seals block water, dust and splash ingress while holding the factory lithium grease in place, ensuring smooth, quiet and long-lasting rotation.

6203-RS · GCr15 bearing steel · double RS rubber sealed · 17x40x12mm

Compact and dependable, the 6203-RS is a core rotating component for moisture-exposed and dusty motor-driven products, and is widely chosen for automotive alternators where quiet running and sealing integrity are essential.

2. Product Features

• Waterproof & dust-proof sealing: Double-sided RS rubber contact seals isolate water, dust and particles, and lock the lubricating grease firmly in place, preventing leakage and early wear in damp or dirty environments.
• Low noise & smooth rotation: Precision grinding of raceways and steel balls reduces running friction and vibration, keeping noise at the Z3V3 grade for stable, quiet operation.
• High precision: Manufactured to P6 precision grade, delivering accurate dimensional tolerance and consistent running performance.
• Composite load capacity: Bears both radial load and moderate bidirectional axial load with uniform stress distribution and strong stability.
• Universal interchangeability: Standard 17x40x12mm size with high interchangeability, simple mounting and low maintenance.

3. Product Advantages

Every 6203-RS bearing is strictly inspected against international industry standards. Precision processing combined with full inspection gives the product stable quality, high batch consistency and strong interchangeability. Factory-direct supply supports customized precision and packaging, with sufficient stock and fast delivery, providing a reliable sealed bearing solution for global customers.

4. Product Technical Parameters

5. Product Applications

The 6203-RS sealed deep groove ball bearing is widely used in moisture-prone, medium-speed rotating assemblies. Its primary and most typical application is automotive alternators, where the bearing supports the rotor shaft under high speed, heat and vibration while its rubber seals keep out road dust and moisture. The same sealing and low-noise characteristics also suit other damp or dusty motor-driven devices that demand stable, long-term operation of the supporting unit.

Typical application · automotive alternator

6. About Us

Ningbo Kent bearing company was established in 2003 and is one of the leading bearing manufacturers and exporters in China. Kent specializes in the design and production of high precision, high speed and low noise  groove ball bearings and pillow block bearings. At present, the Corporation has more than 1,000 employees, a fixed assets of 2 billion yuan, and produces 250 million sets of bearings annually. The Corporation's products are widely used in more than 50 countries and regions under 2 independent brands, namely "BUGAO" and "NBKT".In addition, we participate in major professional exhibitions at home and abroad every year.