R28 Deep groove ball bearing
| R28 Deep groove ball bearing | |||
|---|---|---|---|
| Part Number | R28 | Ball Number | 8 |
| d | 12.7 | Ball Size | 4.762 |
| D1 | 28.575 | Dynamic Load Co(N) | 1890 |
| B | 9.938 | Static Load Cor(N) | 925 |
| R | 0.4 | Grease Speed | 36000 |
| Weight(Kg) | 0.0038 | Oil Speed | 43000 |
R28 Miniature Deep Groove Ball Bearing | Open, ZZ, 2RS High Precision Bearings
The R28 deep groove ball bearing is a high-precision imperial miniature bearing designed for compact, space-constrained micro mechanical systems requiring stable high-speed rotation, low noise and long service life. Adopting standard imperial dimensions, finely polished raceways and high-precision rolling elements, this single-row micro bearing delivers ultra-low friction, minimal vibration and excellent dimensional stability. Optimized for light-load and high-frequency cyclic operation, the R28 features sturdy structural rigidity and reliable fatigue resistance, maintaining long-term operational accuracy for miniaturized electromechanical and automated precision equipment. Available in three mainstream industrial specifications including open type, R28ZZ double metal shield type and R28-2RS double rubber sealed type, this imperial bearing supports five industrial-grade materials to adapt to economical, sanitary, high-wear and corrosive working environments for diverse micro-precision industrial applications.
R28 Open / ZZ / 2RS Structural Features
R28 Open Type: The unsealed open structure enables unobstructed air circulation and efficient heat dissipation, effectively preventing thermal accumulation during prolonged high-speed continuous operation. It supports convenient grease replenishment and tool-free routine maintenance without generating extra rotational resistance. Ideal for clean, dry indoor workshops and fully enclosed precision micro machinery, it retains ultra-high running accuracy and stable long-cycle performance for lightweight micro mechanical assemblies.
R28ZZ Double Metal Shields: Equipped with dual non-contact steel shields, the R28ZZ 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. Featuring stable durability and outstanding cost performance, it is widely applied in dry working conditions for micro high-speed motors, drone precision components, optical instruments and miniature transmission systems.
R28-2RS Double Rubber Seals: The fully sealed R28-2RS variant adopts double-sided contact rubber seals to comprehensively isolate moisture, water splashes, oil mist and corrosive fine dust. It securely 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 environments for portable micro precision devices and outdoor miniature electromechanical equipment.
R28 Bearing Material Performance
Carbon Steel: High cost-performance industrial base material with uniform hardness and stable anti-fatigue properties. It delivers reliable wear resistance and smooth high-speed rotation for standard micro precision machinery, ideal for mass batch 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 environments, perfectly suitable for food processing accessories and sanitary micro precision equipment.
316 Stainless Steel: Marine-grade corrosion-resistant material with strong tolerance to acid, alkali and salt spray erosion. 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 top-tier 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 R28 imperial miniature bearing features a compact lightweight structure, ultra-quiet operation and durable high-speed precision. Three universal sealing solutions and five diversified material grades fully meet industrial demands 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. As a critical compact imperial rotary component for space-limited micro systems, the R28 bearing provides high-efficiency, low-maintenance and ultra-precise rotation solutions for modern miniaturized industrial and commercial precision equipment.
