639 Deep Groove Ball Bearings
| 639 Deep Groove Ball Bearings | |||
|---|---|---|---|
| Part Number | 639 | Ball Number | 8 |
| d | 9 | Ball Size | 4.762 |
| D1 | 30 | Dynamic Load Co(N) | 5600 |
| B | 10 | Static Load Cor(N) | 2390 |
| R | 0.6 | Grease Speed | 24000 |
| Weight(Kg) | 0.0365 | Oil Speed | 30000 |
639 Deep Groove Ball Bearing | Open, ZZ, 2RS High-Speed Mini Bearings
The 639 deep groove ball bearing is a high-precision miniature component in the 6300 series, optimized with refined raceway geometry and upgraded rolling element layout to deliver stable low-friction and ultra-quiet high-speed operation. This single-row deep groove ball bearing boasts exceptional dimensional stability and anti-fatigue durability, perfectly suited for long-term light cyclic loads in miniature precision electromechanical systems. Featuring ultra-compact size and lightweight design, it acts as an essential core rotary part for micro transmission and precision automation equipment. The 639 series supports three mainstream configurations: open type, 639ZZ double metal shield type and 639-2RS double rubber sealed type. Five industrial-grade material options fully meet economical, sanitary, wear-resistant and anti-corrosion requirements for diverse miniature industrial working scenarios.
639 Open / ZZ / 2RS Structural Features
639 Open Type: The unsealed open structure ensures unobstructed air circulation and efficient heat dissipation during continuous high-speed operation. It enables convenient grease replacement and daily cleaning without generating extra rotational resistance. Designed for clean, dry indoor environments and fully enclosed precision micro machinery, it maintains stable running accuracy and consistent performance during long-cycle light-load operation.
639ZZ Double Metal Shields: Equipped with dual-sided non-contact steel shields, this professional dust-proof bearing effectively blocks fine dry dust, tiny floating particles and micro workshop debris. The non-contact structure preserves original high-speed precision and rotational smoothness with minimal friction loss. With reliable long-term durability and outstanding cost performance, 639ZZ bearings are widely used in dry micro automation devices, small precision motors, consumer electronic equipment and general miniature transmission systems.
639-2RS Double Rubber Seals: This fully sealed variant adopts double-sided contact rubber seals to comprehensively isolate moisture, splash water, oil mist and corrosive fine dust. It tightly locks internal lubricating grease to prevent leakage, oxidation and aging, realizing long-term maintenance-free operation. It perfectly adapts to humid, dusty and mild outdoor working conditions for miniature precision mechanical equipment.
639 Bearing Material Performance
Carbon Steel: Standard cost-effective industrial material with uniform hardness and stable anti-fatigue properties. It delivers reliable wear resistance and smooth high-speed rotation for conventional light-load miniature equipment, offering excellent cost performance for mass consumer electronics and general industrial applications.
304 Stainless Steel: Food-grade stainless steel with superior oxidation and rust resistance. It prevents surface corrosion and precision degradation in humid and open environments, ideal for food processing micro devices, sanitary equipment and daily precision miniature machinery.
316 Stainless Steel: Premium marine-grade corrosion-resistant material with strong tolerance to acid, alkali and salt spray. It withstands mild chemical erosion and coastal high humidity, suitable for marine micro equipment, sanitary devices and light chemical precision instruments.
420 Stainless Steel: High-toughness martensitic stainless steel balancing moderate corrosion resistance and high surface hardness. It features stable wear and impact resistance, ensuring consistent dimensional accuracy during long-cycle continuous operation of miniature precision parts.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance and structural stability. It maintains precise, stable operation under slight wear and complex corrosive environments, customized for high-end electronic and industrial precision miniature equipment.
Core Advantages And Industrial Applications
The 639 deep groove ball bearing features ultra-compact lightweight structure, ultra-low noise, zero vibration and stable high-speed performance. Three diversified sealing structures and five professional material grades fully cover economical, anti-rust, wear-resistant and anti-corrosion miniature application scenarios. It is extensively applied in micro drive motors, precision testing instruments, consumer electronics, smart device accessories, small household appliances, miniature medical devices, automated precision components and food processing micro machinery, providing durable, low-maintenance and high-efficiency precision rotation solutions for modern light-load miniature mechanical systems.
