MR52 Bearing | Open / ZZ / RS Seals | High-Precision Micro Ball Bearings for Tiny Mechanisms

The MR52 bearing is a ultra-compact metric micro deep groove ball bearing engineered for ultra-narrow installation spaces and lightweight precision mechanical systems. Featuring tiny outer diameter, slim structure and ultra-silent rotary performance, this micro bearing delivers consistent running accuracy and low inertial resistance during frequent start-stop operation. It is available in Open, ZZ and RS sealing configurations, paired with five industrial-grade metal materials, providing targeted wear-proof, dust-proof, waterproof and anti-corrosion solutions for miniature precision equipment in diverse working conditions.

MR52 Bearing Seal Type Features And Application Scenarios

MR52 Open Bearing: Designed with a fully open structure without any shielding cover, enabling unobstructed air circulation and rapid heat dissipation. It features minimal rotary resistance and supports frequent high-speed cycling operation. The open structure allows convenient manual greasing and daily inspection, ideal for sterile, dust-free indoor environments such as precision micro sensors, miniature robotic joints and high-precision experimental testing devices.

MR52ZZ Bearing (Double Metal Shields): Adopts dual-side non-contact metal protective shields, which effectively isolate dry fine dust, floating powder and tiny industrial debris. Without generating extra operating friction, it maintains original precise rotation and excellent thermal stability. This shielded model is dedicated for dry indoor working environments, widely used in micro drive motors, precision optical modules and portable smart electronic devices.

MR52RS Bearing (Double Rubber Seals): Equipped with double-sided contact rubber seal rings with high fitting tightness, forming a fully enclosed protective layer. It effectively resists moisture infiltration, dust accumulation and fine particle contamination, realizing long-term maintenance-free operation. It is the optimal choice for variable environments such as humid workshop production lines, miniature outdoor monitoring equipment and automated micro transmission accessories.

MR52 Bearing Material Performance And Industrial Uses

Bearing Steel: Standard high-rigidity bearing steel with outstanding wear resistance and stable micro load capacity. It features high structural stability and cost competitiveness, perfectly suited for conventional miniature machinery, small drive motors and general precision transmission components with ordinary working requirements.

304 Stainless Steel: Possesses excellent atmospheric oxidation resistance and basic rust-proof performance. It maintains stable mechanical properties in conventional humid and ventilated environments, serving as an economical option for consumer micro electronics, light industrial miniature fittings and ordinary low-load civilian equipment.

420 Stainless Steel: Integrates high hardness, fine mechanical toughness and weak chemical corrosion resistance. It keeps smooth and accurate rotation under long-term intermittent operation, mainly applied in miniature medical devices, precision optical instruments and high-end smart micro mechanical equipment.

440 Stainless Steel: Features ultra-high hardness and superior anti-abrasion capability, with strong tolerance to medium corrosive working environments. It delivers long-lasting stable operation for high-precision automation micro parts, miniature hydraulic accessories and precision industrial transmission systems.

316 Stainless Steel: Boasts premium salt spray resistance, acid and alkali corrosion resistance, adapting to harsh and severe corrosive scenarios. It is widely deployed in marine miniature fittings, food processing precision machinery, chemical experimental instruments and medical sanitary precision equipment.

Core Product Advantages: The MR52 micro bearing supports diversified sealing and material matching schemes, featuring ultra-small size, zero-delay rotation, low noise and strong environmental adaptability. It covers precision instrumentation, electronic intelligence, industrial automation, medical health, food processing and marine industries, fully meeting customized micro-precision transmission demands for compact mechanical equipment.