MR117 Miniature Deep Groove Ball Bearing | Open, ZZ, 2RS High Precision Bearings

The MR117 deep groove ball bearing is a high-precision miniature bearing engineered for ultra-compact, space-constrained micro mechanical systems requiring stable high-speed rotation, low vibration and long service life. Built with refined miniature dimensions, mirror-polished raceways and precision rolling elements, this single-row micro bearing delivers ultra-low friction, consistent dimensional accuracy and reliable rotational stability. Optimized for light-load and high-frequency cyclic operation, the MR117 maintains solid structural rigidity and outstanding wear resistance, perfectly fitting modern miniaturized precision electromechanical devices. Available in three standard industrial configurations, including open type, MR117ZZ double metal shield type and MR117-2RS double rubber sealed type, this bearing features five industrial-grade material options to suit economical, sanitary, high-wear and corrosive working environments for diverse micro-precision applications.

MR117 Open / ZZ / 2RS Structural Features

MR117 Open Type: The unsealed open structure enables unobstructed air circulation and efficient heat dissipation, effectively preventing thermal accumulation during prolonged high-speed micro operation. It supports easy grease replenishment and hassle-free routine maintenance without generating extra rotational resistance. Ideal for clean, dry indoor environments and fully enclosed micro precision machinery, it retains ultra-high running accuracy and stable long-cycle performance for lightweight micro mechanical assemblies.

MR117ZZ Double Metal Shields: Equipped with dual non-contact steel shields, the MR117ZZ miniature bearing effectively blocks fine dry dust, floating micro particles and tiny industrial debris. The non-contact protective design preserves original high-speed smoothness and micro precision with negligible friction loss. Offering reliable durability and excellent cost performance, it is widely adopted in dry working conditions for micro high-speed motors, drone precision components, optical instruments and miniature transmission systems.

MR117-2RS Double Rubber Seals: The fully sealed MR117-2RS variant adopts double-sided contact rubber seals to comprehensively isolate moisture, water splashes, oil mist and corrosive fine dust. It tightly locks internal micro lubricant to prevent leakage, oxidation and aging, enabling long-term maintenance-free operation. This versatile sealed model operates stably in humid, dusty and mildly harsh scenarios for portable micro precision devices and outdoor miniature electromechanical equipment.

MR117 Bearing Material Performance

Carbon Steel: High cost-performance industrial base material with uniform hardness and stable anti-fatigue properties. It delivers consistent wear resistance and smooth high-speed rotation for standard micro precision machinery, ideal for mass production and cost-sensitive miniature equipment projects.

304 Stainless Steel: Food-grade stainless steel with superior rust and oxidation resistance. It prevents micro corrosion in humid and open working environments, perfectly suited for sanitary processing equipment and food-safe miniature precision devices.

316 Stainless Steel: Marine-grade corrosion-resistant material with strong tolerance to acid, alkali and salt spray. It withstands coastal humidity and mild chemical exposure, applicable for marine micro instruments and light chemical miniature machinery.

420 Stainless Steel: High-toughness martensitic stainless steel balancing moderate corrosion resistance and high surface hardness. It maintains stable wear resistance and precise dimensional stability during continuous high-speed micro cyclic operation.

440 Stainless Steel: Ultra-high hardness stainless steel with outstanding abrasion resistance and structural stability. It ensures accurate and stable micro operation under severe wear and corrosive conditions, optimized for high-end micro precision mechanical systems.

Core Advantages And Industrial Applications

The MR117 deep groove ball bearing features an ultra-compact miniature structure, lightweight design, low noise and durable high-speed precision. Three sealing types and five professional material grades fully satisfy industrial requirements for economy, rust resistance, wear resistance and corrosion resistance. It is extensively applied in miniature high-speed motors, drone precision parts, optical precision instruments, micro transmission components, portable micro power tools and compact medical devices. Serving as a critical ultra-small rotary component for space-limited micro systems, the MR117 bearing provides high-efficiency, low-maintenance and ultra-precise rotation solutions for modern miniaturized industrial and commercial precision equipment.