R4 Bearing | Open / ZZ / RS Seals | Heavy-Duty Inch Mini Bearings for Compact Mechanical Systems

The R4 bearing is a popular inch-size miniature deep groove ball bearing with upgraded load-bearing performance, tailored for compact mechanical setups that require stable torque and extended service life. Compared with smaller R-series micro bearings, the R4 model features optimized internal structure, enhanced rigidity and consistent low-noise operation. Available in Open, ZZ, RS three sealing grades and five industrial material specifications, this versatile inch bearing delivers targeted protection and performance for diverse light to medium duty precision machinery.

R4 Bearing Sealing Type Features And Working Scenarios

R4 Open Bearing: Built with a non-sealed open framework for maximum airflow and unobstructed rotary movement. It minimizes operating friction and accelerates heat dissipation during prolonged high-speed running. The open design allows effortless grease renewal and routine inspection, making it a perfect fit for clean indoor facilities, precision rotary modules and high-frequency miniature transmission equipment.

R4ZZ Bearing (Double Metal Shields): Adopts dual-sided non-contact metal shielding plates to intercept dry dust, fine industrial powder and floating particulate impurities. With zero friction increase and excellent heat aging resistance, it maintains steady high-speed accuracy in dry workshop environments. Widely used for miniature drive motors, precision sensing devices and office intelligent mechanical parts.

R4RS Bearing (Double Rubber Seals): Equipped with dual-contact rubber sealing rings that form a fully enclosed protective barrier. It effectively blocks water splashes, moisture condensation, dust and dirt contamination, achieving long-term maintenance-free operation. This robust sealed version is ideal for complex environments including humid production workshops, outdoor intelligent equipment and automated precision assembly accessories.

R4 Bearing Material Specifications And Industrial Applications

Bearing Steel: High-strength chrome bearing steel with outstanding surface hardness, superior wear resistance and upgraded load capacity. It offers stable mechanical performance and cost advantages, widely applied in general miniature machinery, small power motors and conventional industrial transmission components.

304 Stainless Steel: Features reliable anti-oxidation and atmospheric rust-proof properties, maintaining stable operation in conventional humid and indoor-outdoor environments. It is a cost-effective option for consumer electronic devices, light industrial equipment and ordinary low-load miniature mechanical fittings.

420 Stainless Steel: Combines high hardness, excellent impact toughness and mild corrosion resistance, retaining precise and smooth rotation under long-term cyclic operation. Primarily used in precision optical instruments, lightweight medical devices and high-end intelligent micro mechanical systems.

440 Stainless Steel: Possesses ultra-high hardness and exceptional abrasion resistance, with strong adaptability to medium corrosive working conditions. It delivers durable and stable performance for automation precision parts, micro hydraulic components and industrial high-load miniature transmission equipment.

316 Stainless Steel: Boasts excellent salt spray resistance, acid and alkali corrosion resistance, as well as high-temperature oxidation stability. It copes with extreme harsh working environments, suitable for marine equipment accessories, food processing machinery, chemical test instruments and medical sanitary facilities.

Product Core Advantages: The R4 inch miniature bearing stands out with diverse sealing options, rich material customization, enhanced structural rigidity and low-vibration operation. It adapts to multiple complex working environments, covering consumer electronics, industrial automation, medical sanitation, food processing and marine industries, meeting multi-scenario precision transmission and durable operation requirements.