6904 Deep Groove Ball Bearings
| 6904 Deep Groove Ball Bearings | |||
|---|---|---|---|
| Part Number | 6904 | Ball Number | 12 |
| d | 20 | Ball Size | 4.762 |
| D1 | 37 | Dynamic Load Co(N) | 6400 |
| B | 9 | Static Load Cor(N) | 3700 |
| R | 0.3 | Grease Speed | 19000 |
| Weight(Kg) | 0.0370 | Oil Speed | 22000 |
6904 Deep Groove Ball Bearing | Open, ZZ, 2RS Ultra-Thin Micro Bearings
The 6904 deep groove ball bearing is a high-stability ultra-thin micro precision model in the 6900 series, built with reinforced raceway structures and optimized rolling element layout to enhance structural rigidity and stable light-medium load capacity. Tailored for ultra-compact, space-constrained installation scenarios, this single-row thin-wall miniature bearing delivers low-friction smooth rotation, consistent dimensional accuracy and excellent anti-fatigue performance. It supports long-term ultra-quiet, continuous high-speed cyclic operation, serving as a core rotary component for miniaturized electromechanical devices and compact precision electronic systems. The 6904 series features three standard industrial configurations: open type, 6904ZZ double metal shield type and 6904-2RS double rubber sealed type, with five industrial-grade materials adapting to economical, sanitary, wear-resistant and corrosive complex working environments.
6904 Open / ZZ / 2RS Structural Features
6904 Open Type: The unsealed open structure enables unobstructed air circulation and efficient heat dissipation, effectively preventing thermal accumulation during prolonged high-speed micro operation. It allows tool-free grease replenishment and simple daily maintenance without generating extra rotational resistance. Ideal for clean, dry indoor workshops and fully enclosed micro-precision equipment, it maintains stable running accuracy and reliable performance during long-cycle light-medium load operation.
6904ZZ Double Metal Shields: Equipped with dual-sided non-contact steel shields, this professional dust-proof micro bearing effectively blocks fine dry dust, floating micro particles and tiny industrial debris. The non-contact protective design retains original high-speed precision and rotational smoothness with minimal friction loss. Featuring durable service life and superior cost performance, 6904ZZ bearings are widely applied in dry miniature high-speed motors, precision consumer electronics, smart micro devices and compact micro-transmission systems.
6904-2RS 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 micro lubricating grease to prevent leakage, oxidation and aging, realizing long-term maintenance-free operation. It stably adapts to humid, dusty and mildly harsh working conditions for portable, outdoor and industrial micro-precision electromechanical equipment.
6904 Bearing Material Performance
Carbon Steel: High cost-performance standard industrial material with uniform hardness and stable anti-fatigue properties. It delivers reliable wear resistance and smooth high-speed rotation for conventional micro-precision equipment, providing optimal cost efficiency for mass electronic products and small industrial batch applications.
304 Stainless Steel: Food-grade stainless steel with superior oxidation and rust resistance. It prevents micro corrosion and precision degradation in humid and open environments, ideal for miniature food processing equipment, sanitary micro-devices and daily precision gadgets.
316 Stainless Steel: 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-precision parts, sanitary instruments and chemical miniature equipment.
420 Stainless Steel: High-toughness martensitic stainless steel balancing moderate corrosion resistance and high surface hardness. It features stable wear and impact resistance, maintaining accurate micro dimensional stability during long-term continuous high-speed operation.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance and structural stability. It sustains precise, stable operation under severe wear and corrosive environments, customized for high-end miniature ultra-thin precision industrial and electronic equipment.
Core Advantages And Industrial Applications
The 6904 deep groove ball bearing features an ultra-compact micro-size structure, lightweight ultra-thin design, ultra-low noise and durable high-speed precision performance. Three diversified sealing structures and five professional material grades fully cover economical, anti-rust, wear-resistant and anti-corrosion micro-precision application scenarios. It is extensively used in miniature precision motors, smart wearable devices, consumer electronics, small household appliances, micro medical devices, automated micro-components and light-duty sanitary machinery. This bearing provides compact, low-maintenance and high-efficiency precision rotation solutions for modern micro-space limited miniaturized mechanical systems, meeting diverse commercial and industrial precision operation demands.
