6720 Deep Groove Ball Bearings
| 6720 Deep Groove Ball Bearings | |||
|---|---|---|---|
| Part Number | 6720 | Ball Number | 42 |
| d | 100 | Ball Size | 3.969 |
| D1 | 125 | Dynamic Load Co(N) | 7450 |
| B | 10 | Static Load Cor(N) | 7750 |
| R | 0.3 | Grease Speed | 7000 |
| Weight(Kg) | 0.185 | Oil Speed | 8400 |
6720 Deep Groove Ball Bearing | Open, ZZ, 2RS Thin-Wall Precision Bearings
The 6720 deep groove ball bearing is a top-tier large-bore heavy-duty thin-wall precision model in the 6700 series, equipped with fully thickened raceway structures and upgraded oversized rolling elements to maximize structural rigidity and heavy-load bearing capacity. Retaining the series’ iconic ultra-slim lightweight design, this single-row bearing solves extreme space-constrained installation challenges for large compact precision machinery without compromising load endurance. It delivers exceptional anti-fatigue performance, low-friction smooth rotation and stable dimensional consistency, supporting long-term low-noise, high-speed continuous operation under severe heavy cyclic loads. The 6720 series offers three standard industrial configurations: open type, 6720ZZ double metal shield type and 6720-2RS double rubber sealed type, with five industrial-grade materials adapting to economical, sanitary, high-wear and corrosive complex industrial working environments.
6720 Open / ZZ / 2RS Structural Features
6720 Open Type: The unsealed open structure features unobstructed air circulation and efficient heat dissipation, completely avoiding thermal accumulation during prolonged high-speed continuous operation. It supports fast grease replacement and tool-free routine maintenance with zero extra rotational resistance. Perfect for clean, dry indoor workshops and fully enclosed large slim precision equipment, it maintains stable running accuracy and consistent performance during long-cycle heavy-load operation.
6720ZZ Double Metal Shields: Fitted with dual-sided non-contact steel shields, this high-performance dust-proof bearing effectively blocks fine dry dust, floating micro particles and industrial debris. The non-contact protective design preserves original high-speed precision and rotational fluency with minimal friction loss. Boasting outstanding long-term durability and superior cost performance, 6720ZZ bearings are widely deployed in dry precision automation systems, large slim high-power motors, precision industrial electronics and compact heavy-duty transmission machinery.
6720-2RS Double Rubber Seals: This fully sealed premium variant adopts double-sided contact rubber seals to comprehensively isolate moisture, splash water, oil mist and corrosive fine dust. It firmly locks internal lubricating grease to prevent leakage, oxidation and aging, achieving long-term maintenance-free operation. It reliably adapts to humid, dusty and mildly harsh outdoor working conditions for large-scale compact high-precision electromechanical equipment.
6720 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 heavy-load precision equipment, providing optimal cost efficiency for mass industrial and electronic batch applications.
304 Stainless Steel: Food-grade stainless steel with excellent oxidation and rust resistance. It resists surface corrosion and precision degradation in humid open environments, ideal for food processing machinery, sanitary equipment and slim precision devices.
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 precision parts, sanitary processing devices and chemical precision instruments.
420 Stainless Steel: High-toughness martensitic stainless steel with balanced hardness and corrosion resistance. It features stable wear and impact resistance, maintaining accurate dimensional stability during long-term continuous precision operation.
440 Stainless Steel: Ultra-high hardness stainless steel with top-tier abrasion resistance. It sustains precise, stable operation under severe wear and corrosive conditions, customized for high-end industrial slim precision equipment.
Core Advantages And Industrial Applications
The 6720 deep groove ball bearing integrates an ultra-thin space-saving structure, lightweight design, supreme heavy-load capacity, ultra-low noise and long-lasting high-speed stability. Three versatile sealing structures and five professional material grades fully cover economical, anti-rust, wear-resistant and anti-corrosion precision application scenarios. It is widely applied in large slim high-power precision motors, industrial automation transmission systems, precision testing instruments, smart mechanical components, miniature medical devices and food processing machinery, providing compact, low-maintenance and high-efficiency precision rotation solutions for modern space-limited heavy-duty precision mechanical systems.
