628 Deep Groove Ball Bearings
| 628 Deep Groove Ball Bearings | |||
|---|---|---|---|
| Part Number | 628 | Ball Number | 8 |
| d | 8 | Ball Size | 3.969 |
| D1 | 24 | Dynamic Load Co(N) | 3350 |
| B | 8 | Static Load Cor(N) | 1430 |
| R | 0.3 | Grease Speed | 28000 |
| Weight(Kg) | 0.0172 | Oil Speed | 34000 |
628 Deep Groove Ball Bearing | Open, ZZ, 2RS High-Speed Mini Bearings
The 628 deep groove ball bearing is a high-precision miniature and light-duty model in the 620 series, featuring optimized internal raceway design and upgraded rolling elements for improved load capacity and running stability. This single-row deep groove ball bearing adopts a compact, lightweight structure, delivering low-friction, ultra-quiet and consistent high-speed rotation, which is ideal for various micro transmission systems and precision lightweight mechanical equipment. The 628 series comes in three standard configurations: open type, 628ZZ double metal shield type and 628-2RS double rubber sealed type. Equipped with five industrial-grade materials, it fully adapts to economical, sanitary, high-wear and corrosive working conditions for diversified miniature precision applications.
628 Open / ZZ / 2RS Structural Features
628 Open Type: The unsealed open structure ensures unobstructed heat dissipation and smooth internal grease circulation without extra rotational resistance. It supports fast lubricant replacement and simple daily maintenance. Suitable for clean, dry indoor environments and fully enclosed precision micro machinery, it maintains stable dimensional accuracy and reliable high-speed performance during long-term light-load cyclic operation.
628ZZ Double Metal Shields: Fitted 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 operational stability without increasing friction loss. With excellent durability and cost performance, it is widely used in dry micro automation, small DC motors, precision electronics and general miniature transmission equipment.
628-2RS Double Rubber Seals: This fully sealed version adopts double-sided contact rubber seals to achieve comprehensive isolation from moisture, oil mist, splash water and corrosive fine dust. It tightly locks internal lubricating grease to prevent leakage and aging, enabling long-term maintenance-free operation, perfectly catering to humid, dusty and mild outdoor working scenarios for miniature precision devices.
628 Bearing Material Performance
Carbon Steel: Cost-effective standard industrial material with uniform hardness and excellent anti-fatigue properties. It provides stable wear resistance and smooth high-speed rotation for conventional light-load miniature equipment, offering outstanding cost performance for mass civilian electronics and general industrial scenarios.
304 Stainless Steel: Food-grade stainless steel with superior anti-oxidation and rust resistance. It prevents surface corrosion and precision degradation in humid and open environments, suitable for food processing mini 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, ideal for sanitary miniature equipment, marine micro devices and light chemical precision instruments.
420 Stainless Steel: High-toughness martensitic stainless steel with balanced corrosion resistance and high surface hardness. It delivers reliable wear and impact resistance, ensuring stable dimensional accuracy for long-cycle running miniature precision parts.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance and structural stability. It maintains precise operation under slight wear and complex corrosive environments, customized for high-end electronic and industrial precision miniature equipment.
Core Advantages And Industrial Applications
The 628 deep groove ball bearing features ultra-compact size, lightweight design, 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 applied in micro motors, precision instruments, consumer electronics, intelligent toy transmission parts, small household appliances, miniature medical devices, automated precision accessories and food processing micro equipment, providing durable, low-maintenance and high-efficiency precision rotation solutions for modern light-load miniature mechanical systems.
