MR74 Deep Groove Ball Bearing
| MR74 Deep Groove Ball Bearing | |||
|---|---|---|---|
| Part Number | MR74 | Ball Number | 6 |
| d | 4 | Ball Size | 1.588 |
| D1 | 7 | Dynamic Load Co(N) | 3100 |
| B | 2 | Static Load Cor(N) | 1150 |
| R | 0.1 | Grease Speed | 70000 |
| Weight(Kg) | 0.00025 | Oil Speed | 82000 |
MR74 Miniature Deep Groove Ball Bearing | Open, ZZ, 2RS High Precision Bearings
The MR74 deep groove ball bearing is a compact high-precision miniature bearing developed for ultra-small, space-restricted micro mechanical systems. Featuring miniaturized dimensions, finely polished raceways and precision rolling elements, this single-row micro bearing delivers ultra-low friction, low vibration and stable high-speed rotational performance. Designed for light-load and high-frequency cyclic operation, the MR74 bearing maintains excellent dimensional accuracy and consistent structural stability while saving maximum installation space. It is available in three standard industrial versions: open type, MR74ZZ double metal shield type and MR74-2RS double rubber sealed type. Supported by five industrial-grade materials, this bearing flexibly adapts to economical, sanitary, high-wear and corrosive working environments for diverse micro-precision industrial and commercial applications.
MR74 Open / ZZ / 2RS Structural Features
MR74 Open Type: The unsealed open structure ensures unobstructed air circulation and efficient heat dissipation, effectively avoiding thermal accumulation during prolonged high-speed micro operation. It supports convenient grease replenishment and simple routine maintenance without generating extra rotational resistance. Suitable for clean, dry indoor workshops and fully enclosed micro precision machinery, it retains ultra-high running accuracy and stable long-cycle performance for lightweight micro mechanical assemblies.
MR74ZZ Double Metal Shields: Equipped with dual non-contact steel shields, the MR74ZZ 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 reliable durability and outstanding cost performance, it is widely applied in dry working conditions for micro high-speed motors, drone accessories, optical instruments and miniature transmission systems.
MR74-2RS Double Rubber Seals: The fully sealed MR74-2RS variant adopts double-sided contact rubber seals to comprehensively isolate moisture, water splashes, oil mist and corrosive fine dust. It tightly locks internal micro lubricating grease 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.
MR74 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 batch production and cost-sensitive miniature equipment projects.
304 Stainless Steel: Food-grade stainless steel with excellent anti-rust and anti-oxidation performance. 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 micro cyclic operation.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance and structural stability. It sustains accurate and stable micro operation under severe wear and corrosive conditions, customized for high-end micro precision mechanical systems.
Core Advantages And Industrial Applications
The MR74 deep groove ball bearing features an ultra-compact miniature structure, lightweight design, ultra-low noise 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 precision components, optical precision instruments, micro transmission parts, portable micro power tools and compact medical devices. As a core ultra-small rotary component for space-limited micro mechanical systems, the MR74 bearing delivers high-efficiency, low-maintenance and ultra-precise rotation solutions for modern miniaturized industrial and commercial precision equipment.
