R18 Miniature Deep Groove Ball Bearing | Open, ZZ, 2RS High Precision Bearings

The R18 deep groove ball bearing is a high-precision imperial miniature bearing designed for compact, space-limited micro mechanical systems requiring stable high-speed rotation, low noise and long service lifespan. Adopting standard imperial dimensions, finely polished raceways and precision rolling elements, this single-row micro bearing delivers ultra-low friction, minimal vibration and consistent dimensional stability. Optimized for light-load and high-frequency cyclic operation, the R18 features rigid structural design and reliable fatigue resistance, maintaining stable precision in long-term continuous operation. Available in three mainstream industrial versions including open type, R18ZZ double metal shield type and R18-2RS double rubber sealed type, this imperial micro bearing supports five industrial-grade materials to fit economical, sanitary, high-wear and corrosive working scenarios for various micro-precision equipment.

R18 Open / ZZ / 2RS Structural Features

R18 Open Type: The unsealed open structure ensures unobstructed air circulation and efficient heat dissipation, effectively eliminating thermal accumulation during prolonged high-speed operation. It allows straightforward grease replenishment and simple daily maintenance without increasing rotational resistance. Suitable for clean, dry indoor environments and fully enclosed precision micro machinery, it retains ultra-high running accuracy and stable long-cycle performance for lightweight micro mechanical assemblies.

R18ZZ Double Metal Shields: Equipped with dual non-contact steel shields, the R18ZZ miniature bearing effectively blocks dry fine dust, floating micro particles and tiny industrial debris. The non-contact protective structure preserves original high-speed smoothness and micro precision with negligible friction loss. With excellent durability and cost efficiency, it is widely used in dry working conditions for micro high-speed motors, drone precision parts, optical instruments and miniature transmission components.

R18-2RS Double Rubber Seals: The fully sealed R18-2RS variant adopts double-sided contact rubber seals to fully isolate moisture, water splashes, oil mist and corrosive fine dust. It tightly locks internal lubricating grease to prevent leakage, oxidation and aging, realizing long-term maintenance-free operation. This versatile sealed model runs stably in humid, dusty and mildly harsh environments for portable micro precision devices and outdoor miniature electromechanical equipment.

R18 Bearing Material Performance

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

304 Stainless Steel: Food-grade stainless steel with excellent rust and oxidation resistance. It resists micro corrosion in humid and open environments, perfectly suitable for food processing accessories and sanitary micro precision equipment.

316 Stainless Steel: Marine-grade corrosion-resistant material with strong resistance to acid, alkali and salt spray erosion. It withstands coastal high humidity and mild chemical corrosion, 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 cyclic operation.

440 Stainless Steel: Ultra-high hardness stainless steel with superior 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 R18 imperial miniature bearing features a compact lightweight structure, ultra-low noise and durable high-speed precision. Three universal sealing types and five diversified material grades fully meet industrial requirements for economy, rust resistance, wear resistance and corrosion resistance. It is extensively applied in miniature high-speed motors, drone core components, optical precision instruments, micro transmission parts, portable micro power tools and compact medical devices. Serving as a key imperial miniature rotary component for space-constrained micro systems, the R18 bearing delivers high-efficiency, low-maintenance and ultra-precise rotation solutions for modern miniaturized industrial and commercial precision equipment.