FR2 Flanged Bearing | Open / ZZ / 2RS | Inch-Size Miniature Flange Bearing

FR2 flanged bearing, FR2 open miniature bearing, FR2ZZ shielded bearing, FR2 2RS sealed bearing, inch size miniature flange bearing, precision tiny flanged bearing for model and micro machinery

Product Overview

The FR2 flanged deep groove ball bearing is a standard inch-size miniature flange bearing, different from metric MF-series bearings. Adopting exclusive imperial dimensional specifications and integrated outer ring flange structure, this bearing provides precise axial positioning without extra circlips or retaining rings. It features compact outline, precise rotation and strong structural compatibility, specially designed for inch-standard micro precision equipment, model machinery and customized miniature transmission systems. Its optimized internal raceway structure delivers stable low-torque operation, perfectly matching the lightweight and high-precision assembly demands of modern micro devices.

To adapt to diverse industrial and civilian working environments, the FR2 bearing is available in three mature sealing configurations: open type for ultra-high-speed clean operation, ZZ metal shielded type for dust-proof dry scenarios, and 2RS rubber sealed type for all-round dust and moisture resistance. Equipped with five optional industrial materials, it covers conventional dry transmission, light humidity, dust pollution, food hygiene, medical sterilization and salt spray corrosion scenarios, serving as a versatile universal inch-size miniature flange bearing.

FR2 Seal Type Features And Application Scenarios

1. FR2 Open (No Shield)

The open structure removes all contact barriers, achieving ultra-low friction and top-tier rotational efficiency. It allows free lubrication replacement and real-time maintenance, with excellent heat dissipation performance to avoid heat accumulation during long-hour high-speed operation. Strictly suitable for closed, clean indoor equipment environments with professional circulating lubrication systems. Without dustproof and waterproof capabilities, it is the ideal choice for high-precision, low-resistance, continuous rotating micro components.

2. FR2ZZ Double Metal Shields

Designed with non-contact double-sided steel shields, the structure effectively isolates fine floating dust, tiny debris and fiber impurities in dry working environments. Pre-filled with high-purity high-speed grease for lifelong maintenance-free use, it retains the original low-torque and high-speed performance of the bearing. The non-contact design avoids running friction loss, achieving a perfect balance of dust protection and efficient operation. It is widely used in dry indoor inch-standard model equipment, micro motors, precision optical instruments and smart electronic devices, not applicable for humid or water-splashing scenarios.

3. FR2-2RS Double Rubber Seals

Featured with high-elastic double-sided rubber lip seals, it forms a fully enclosed protective structure inside the bearing. It can effectively block dust, humid air, water splashes and oil contamination, completely isolating external pollutants and preventing internal grease volatilization, oxidation and leakage. The enhanced sealing stability greatly extends the service life in complex variable environments. Slightly increased friction brings better operational stability, making it suitable for semi-open workshops, light industrial sites and unattended long-running miniature transmission equipment.

Material Performance And Industrial Application

1. GCr15 Chrome Steel (AISI 52100)

Features: Boasts high hardness, excellent wear resistance and rigid structural stability, with stable dynamic and static load performance. It operates smoothly with low noise and minimal vibration, offering the highest cost performance for standard inch-size bearing applications. The only limitation is weak anti-rust ability in long-term humid environments.

Applications: The mainstream material for standard dry industrial scenarios, widely applied in inch-standard micro transmission equipment, model power systems, ordinary micro motors and commercial precision electronic devices.

2. 420 Stainless Steel

Features: Heat-treatable magnetic martensitic stainless steel, with excellent oxidation resistance and basic anti-rust performance. It has outstanding toughness and stable intermittent operation capability, being the most cost-effective anti-corrosion alternative for general miniature machinery.

Applications: Ideal for mildly humid indoor environments, household miniature smart devices, daily electronic precision parts and cost-sensitive anti-rust micro mechanical projects.

3. 440 Stainless Steel (440C)

Features: High-performance hardened stainless steel with integrated high hardness, wear resistance and moderate corrosion resistance. It maintains stable operation under medium-speed and micro-load cyclic working conditions, with far better comprehensive durability than ordinary stainless steel materials.

Applications: Universal industrial anti-rust grade, suitable for food processing miniature equipment, precision medical micro-instruments, light salt spray environments and high-stability inch-standard micro mechanical components.

4. 304 Stainless Steel

Features: Non-magnetic food-grade austenitic stainless steel, with superior moisture resistance and weak acid-base corrosion resistance. It supports repeated water washing and high-temperature sterilization, featuring hygienic, non-toxic and pollution-free properties. Due to non-hardenable characteristics, it has low hardness and is only suitable for low-speed and light-load steady operation.

Applications: Dedicated to hygienic and clean scenarios, including food processing micro-devices, medical auxiliary precision parts, laboratory clean instruments and sanitary smart equipment components.

5. 316 Stainless Steel

Features: Molybdenum-alloyed high-end anti-corrosion stainless steel, with excellent resistance to chloride erosion, seawater salt spray and chemical liquid corrosion. It is non-magnetic, sterilizable and durable in harsh corrosive environments, exceeding the anti-corrosion performance of 304 and 420 stainless steel.

Applications: Used for severe corrosion working scenarios, such as marine miniature sensing equipment, chemical micro-instruments, high-grade medical disinfection components and professional anti-corrosion micro transmission devices.

Product Core Advantages

• Exclusive Inch-Size Standard: Adopts professional imperial dimensional specifications, perfectly matching various inch-standard precision equipment and model machinery, solving the compatibility problem of metric bearings in imperial systems.

• Integrated Flange Positioning: One-piece outer ring flange realizes accurate axial limit and rapid installation, eliminating auxiliary fixing parts, simplifying assembly processes and improving equipment precision.

• Diversified Environment Adaptation: Three sealing types and five material combinations freely cope with dry, dusty, humid, hygienic and corrosive working conditions, achieving full-scene industrial applicability.

• Low-Torque Stable Operation: Precisely polished raceway and optimized steel ball matching ensure low friction, low noise and stable rotation, meeting the high-precision operation requirements of miniature precision equipment.

Wide Application Fields

Inch-standard RC model systems, miniature precision motors, optical precision focusing equipment, micro automation transmission components, wearable smart devices, portable beauty equipment, food hygiene miniature devices, precision medical micro-components, marine anti-corrosion micro-equipment and laboratory precision instruments.