R3 Bearing | Open / ZZ / RS Seals | Inch-Sized Mini Bearings for Precision Micro Machinery

The R3 bearing is a standard inch-based miniature deep groove ball bearing, designed specifically for compact micro machinery and limited-space precision assemblies. Featuring optimized inner and outer diameter spacing, this micro bearing delivers stable low-torque rotation, minimal operational vibration and outstanding running consistency. Supplied in Open, ZZ and RS sealing versions with five industrial-grade material options, R3 bearings offer targeted wear-proof, dust-proof and corrosion-resistant solutions for diverse light-duty precision mechanical systems.

R3 Bearing Seal Type Characteristics

R3 Open Bearing: Adopts a fully open unshielded structure with unrestricted airflow circulation. It delivers ultra-low rotational torque and efficient heat dissipation, supporting continuous high-cycle precision operation. Easy for grease refilling and routine upkeep, it is best suited for controlled clean environments, precision micro drive units and laboratory testing equipment.

R3ZZ Bearing (Double Metal Shields): Equipped with dual non-contact metal shields to intercept dry dust, fine powder residues and airborne micro impurities. The friction-free shielding design preserves original running accuracy and delivers reliable thermal stability, ideal for dry workshop conditions, miniature drive motors, precision gauges and daily electronic precision devices.

R3RS Bearing (Double Rubber Seals): Features dual-lip contact rubber sealing structure with superior barrier performance. It effectively blocks moisture penetration, dust accumulation and tiny debris invasion, enabling long-term maintenance-free operation. This sealed variant adapts perfectly to damp, dusty and changeable working environments for outdoor micro devices, smart home machinery and automated precision accessories.

R3 Bearing Material Properties And Industrial Applications

Bearing Steel: Premium chrome steel material with high surface hardness, exceptional wear resistance and steady load-bearing capacity. With reliable structural stability and competitive pricing, it serves as the ideal choice for general micro machinery, small drive motors and conventional precision transmission components.

304 Stainless Steel: Features excellent atmospheric anti-oxidation and everyday rust-proof performance. It maintains stable mechanical performance under normal humid conditions, widely used in civilian electronic parts, light industrial micro equipment and common low-load indoor and outdoor machinery.

420 Stainless Steel: Integrates high hardness, structural toughness and mild chemical corrosion resistance. It sustains precise and smooth rotation under long-term light-load cycling, perfectly applicable in optical precision equipment, portable medical micro-devices and high-end intelligent precision machinery.

440 Stainless Steel: Boasts ultra-high hardness and extreme abrasion resistance, with prominent tolerance to medium corrosive environments. It ensures durable and consistent operation for precision automation components, micro hydraulic fittings and industrial high-precision transmission systems.

316 Stainless Steel: Delivers superior salt spray, acid-base and high-temperature oxidation resistance, capable of resisting harsh corrosive working conditions. It is widely utilized in marine precision fittings, food processing machinery, chemical analytical instruments and medical sanitary equipment.

Core Strengths: The R3 inch miniature bearing features diverse sealing and material matching schemes, high rotary precision, low vibration and strong environmental adaptability. It covers precision instrumentation, electronic manufacturing, industrial automation, medical hygiene, food processing and marine industries, meeting customized micro-precision transmission demands.