FR3-4 Flange Ball Bearings
| FR3-4 Flange Ball Bearings | |||
|---|---|---|---|
| Part Number | FR3-4 | Ball Number | 7 |
| d | 4.762 | Ball Size | 2.381 |
| R | 0.3 | Dynamic Load Co(N) | 1300 |
| D/D1 | 12.7/14.351 | Static Load Cor(N) | 485 |
| B/C | 3.967/1.067 | Grease Speed | 43000 |
| Weight(Kg) | 0.0012 | Oil Speed | 53000 |
FR3-4 Flange Deep Groove Bearing | Open, ZZ, 2RS High Precision Micro Bearing
The FR3-4 flange deep groove ball bearing is a high-precision micro flange bearing designed for ultra-compact, space-restricted miniature mechanical systems requiring stable rotary accuracy, secure flange positioning and long-term continuous high-speed operation. Built with an integrated one-piece flange and finely polished deep groove raceways, this micro bearing delivers consistent dimensional stability, ultra-low vibration and quiet rotary performance during repeated cyclic operation. The integrated flange structure eliminates extra positioning fixtures, accelerates fast precision assembly, and effectively prevents shaft offset and axial play in densely packed micro equipment layouts. Available in three standard industrial variants: FR3-4 open type, FR3-4ZZ double metal shield type and FR3-4-2RS double rubber sealed type, it reliably operates in dry, dusty, humid and mildly corrosive working environments. Offered in carbon steel, 304 stainless steel, 316 stainless steel, 420 stainless steel and 440 stainless steel, the FR3-4 fully satisfies economical, sanitary, high-wear and anti-corrosion micro precision industrial application requirements.
FR3-4 Open / ZZ / 2RS Structural Features
FR3-4 Open Type: The unsealed open structure provides unobstructed air circulation and efficient heat dissipation, preventing thermal accumulation and precision degradation during prolonged high-speed micro operation. It supports easy grease refilling and tool-free routine maintenance without increasing rotational resistance. Ideal for clean, dry indoor workshops and fully enclosed miniature precision machinery, it maintains stable running accuracy and extended service life.
FR3-4ZZ Double Metal Shields: Equipped with dual non-contact steel shields, the FR3-4ZZ effectively blocks fine dry dust, floating particles and micro industrial debris. The non-contact protective design retains original high-speed smoothness and micro precision with minimal friction loss. Featuring outstanding durability and cost performance, this model is widely applied in dry industrial environments and long-running miniature precision automation equipment.
FR3-4-2RS Double Rubber Seals: The fully sealed 2RS structure adopts double-sided contact rubber seals to comprehensively isolate moisture, water splashes, oil mist and corrosive fine dust. It tightly locks internal lubricating grease to prevent leakage, oxidation and aging, enabling long-term maintenance-free operation for humid, dusty and complex micro mechanical working scenarios.
FR3-4 Bearing Material Performance
Carbon Steel: High cost-performance industrial base material with uniform hardness and stable anti-fatigue properties. Carbon steel FR3-4 bearings deliver reliable wear resistance and smooth high-speed rotation, perfect for mass production and budget-sensitive miniature automation projects.
304 Stainless Steel: Food-grade rust-resistant stainless steel with excellent oxidation resistance. It resists micro corrosion in humid and open environments, suitable for miniature food processing accessories, compact medical devices and sanitary-grade micro precision mechanical systems.
316 Stainless Steel: Marine-grade anti-corrosion material with strong tolerance to salt spray, acid and alkali erosion. It maintains stable structural precision in coastal high-humidity and light chemical environments for micro marine instruments and miniature chemical equipment.
420 Stainless Steel: High-toughness martensitic stainless steel balancing moderate corrosion resistance and high surface hardness. It delivers stable wear resistance and precise dimensional stability during continuous high-speed cyclic operation.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance. It withstands severe friction wear and weak corrosive conditions, ensuring long-term accurate and stable rotation for high-end micro precision mechanical systems.
Core Advantages And Industrial Applications
The FR3-4 ultra-compact micro flange bearing features a mini lightweight structure, rigid flange positioning, ultra-quiet operation and durable high-speed precision. Multiple sealing grades and diversified material options fully cover industrial demands for cost efficiency, sanitation, wear resistance and corrosion protection. Widely applied in ultra-miniature high-speed motors, micro drone precision components, slim robotic micro joints, portable optical micro instruments, miniature transmission systems, tiny precision power tools and compact micro medical devices, the FR3-4 serves as a core rotary and positioning component for ultra-space-limited micro mechanical structures. It provides high-efficiency, low-noise and low-maintenance precision rotation solutions for modern miniaturized industrial, commercial and sanitary precision automation equipment.
