638 Deep Groove Ball Bearings
| 638 Deep Groove Ball Bearings | |||
|---|---|---|---|
| Part Number | 638 | Ball Number | 8 |
| d | 8 | Ball Size | 4.762 |
| D1 | 28 | Dynamic Load Co(N) | 5100 |
| B | 9 | Static Load Cor(N) | 2160 |
| R | 0.3 | Grease Speed | 26000 |
| Weight(Kg) | 0.028 | Oil Speed | 31000 |
638 Deep Groove Ball Bearing | Open, ZZ, 2RS High-Speed Mini Bearings
The 638 deep groove ball bearing is a high-precision miniature bearing in the 6300 series, featuring optimized raceway structure and upgraded rolling element layout for stable low-friction, ultra-quiet high-speed operation. This single-row deep groove ball bearing delivers outstanding dimensional stability and anti-fatigue durability, perfectly adapting to long-term light cyclic loads of miniature precision electromechanical equipment. Compact, lightweight and highly versatile, it serves as a core rotary component for micro transmission systems. The 638 series offers three standard configurations: open type, 638ZZ double metal shield type and 638-2RS double rubber sealed type. With five industrial-grade material options, it accommodates economical, sanitary, wear-resistant and anti-corrosion working conditions for diverse miniature industrial applications.
638 Open / ZZ / 2RS Structural Features
638 Open Type: The unsealed open structure enables unobstructed air circulation and efficient heat dissipation during continuous high-speed operation. It supports fast grease replacement and daily routine cleaning without adding extra rotational resistance. Ideal for clean, dry indoor workshops and fully enclosed precision micro machinery, it maintains stable running accuracy and consistent performance under long-cycle light-load operation.
638ZZ Double Metal Shields: Equipped with dual-sided non-contact steel shields, this dust-proof bearing effectively blocks fine dry dust, tiny floating particles and micro workshop debris. The non-contact design retains original high-speed precision and rotational smoothness with minimal friction loss. Featuring reliable durability and excellent cost performance, 638ZZ bearings are widely applied in dry micro automation equipment, small DC motors, precision electronics and general miniature transmission systems.
638-2RS 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 and aging, enabling long-term maintenance-free operation. It perfectly adapts to humid, dusty and mild outdoor working scenarios for miniature precision mechanical equipment.
638 Bearing Material Performance
Carbon Steel: Cost-effective standard industrial material with uniform hardness and stable anti-fatigue properties. It provides reliable wear resistance and smooth high-speed rotation for conventional light-load miniature equipment, delivering 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, light industry and daily precision miniature machinery.
316 Stainless Steel: Premium marine-grade corrosion-resistant material with strong acid, alkali and salt spray tolerance. It withstands mild chemical erosion and coastal high humidity conditions, suitable for sanitary miniature equipment, marine micro 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 and 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 638 deep groove ball bearing features an ultra-compact lightweight structure, ultra-low noise 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 used in micro drive motors, precision 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.
