FR3 Flanged Bearing | Open / ZZ / 2RS | Heavy-Duty Inch Miniature Flange Bearing

FR3 flanged bearing, FR3 open bearing, FR3ZZ shielded bearing, FR3 2RS sealed bearing, inch miniature flange bearing, heavy duty tiny inch flanged bearing for industrial micro machinery

Product Overview

The FR3 flanged deep groove ball bearing is an upgraded heavy-duty inch-series miniature bearing, optimized and upgraded on the basis of conventional FR2 inch bearings. With enlarged sectional size and upgraded internal load structure, it effectively solves the problem of insufficient rigidity and short service life of small-inch miniature bearings under continuous load operation. Featuring a one-piece outer ring flange design, this bearing delivers precise axial positioning without additional fasteners, greatly improving assembly efficiency and structural firmness for inch-standard micro equipment.

Tailored for complex miniature industrial scenarios, the FR3 bearing offers three professional sealing grades: open type for ultra-high-speed clean transmission, ZZ metal shield type for long-term dust-proof operation, and 2RS rubber sealed type for all-weather anti-moisture and anti-pollution protection. Supported by five industrial-grade material options, it covers standard dry transmission, light humidity, dust workshops, food sanitation, medical sterilization and marine salt spray environments, serving as a high-versatility upgraded inch miniature flange bearing for industrial and commercial use.

FR3 Seal Type Features And Application Scenarios

1. FR3 Open (No Shield)

Adopting a fully open unobstructed structure, this bearing minimizes running friction torque and realizes ultra-high-speed smooth rotation. It supports unrestricted grease replacement and equipment maintenance, with superior heat dissipation performance to avoid thermal decay during long-duration high-frequency operation. It is exclusively applicable to closed, dust-free standard indoor environments with active lubrication systems. Without protective capabilities against dust and water, it is the preferred choice for high-precision, low-loss micro rotating parts that pursue extreme operating efficiency.

2. FR3ZZ Double Metal Shields

Equipped with non-contact double-sided steel shields, the structure forms an effective isolation barrier against dry dust, fine particles and floating debris in the air. Pre-filled with long-life stable lubricating grease, it achieves maintenance-free continuous operation. The non-contact design does not interfere with high-speed rotation, retaining excellent dynamic performance while achieving reliable dust resistance. It is widely used in dry inch-standard industrial micro equipment, precision optical instruments, miniature drive motors and intelligent electronic devices, and is not suitable for humid or splashing working conditions.

3. FR3-2RS Double Rubber Seals

Built with high-toughness integrated rubber lip seals on both sides, creating a fully sealed internal protection cavity. It effectively resists dust invasion, humid air erosion, water splashes and industrial oil contamination, locking internal lubricant permanently to prevent grease deterioration and leakage. The enhanced sealing structure improves environmental adaptability greatly, with mild friction increase bringing stronger operational stability and fatigue resistance. It is ideal for semi-open industrial workshops, light industrial complex environments and unattended long-cycle running miniature equipment.

Material Performance And Industrial Application

1. GCr15 Chrome Steel (AISI 52100)

Features: Possesses ultra-high hardness and excellent wear resistance, with significantly improved bearing rigidity and load capacity compared with small-inch bearings. It runs stably with low vibration and low noise, providing ultra-high cost performance for standard industrial working conditions, with only limited anti-rust performance in humid environments.

Applications: The primary choice for conventional dry industrial scenarios, widely used in inch-standard micro transmission machinery, industrial miniature motors, automation precision parts and commercial high-load miniature equipment.

2. 420 Stainless Steel

Features: Heat-treatable magnetic martensitic stainless steel, with reliable oxidation resistance and basic anti-corrosion performance. It boasts excellent impact resistance and stable intermittent operation capability, being the most economical anti-rust material for general miniature mechanical applications.

Applications: Suitable for mildly humid indoor working environments, household intelligent miniature equipment, daily precision electronic components and cost-controlled anti-rust micro mechanical projects.

3. 440 Stainless Steel (440C)

Features: High-performance hardened stainless steel, integrating high hardness, super wear resistance and moderate corrosion resistance. It maintains stable output under medium-speed and continuous micro-load cycles, with outstanding comprehensive durability, far exceeding ordinary stainless steel materials.

Applications: Universal industrial anti-rust grade, perfectly adapted to food processing miniature equipment, precision medical micro-instruments, light salt spray environments and high-stability industrial micro transmission components.

4. 304 Stainless Steel

Features: Non-magnetic food-grade austenitic stainless steel, with excellent moisture resistance and weak acid and alkali corrosion resistance. It supports repeated water washing and high-temperature sterilization, featuring hygienic and pollution-free properties. Due to unhardenable characteristics, it has low surface hardness and is only applicable to low-speed and light-load stable operation.

Applications: Specialized for clean and hygienic scenarios, including food and beverage micro-processing equipment, medical auxiliary precision devices, laboratory clean instruments and sanitary intelligent equipment parts.

5. 316 Stainless Steel

Features: Molybdenum-reinforced high-end anti-corrosion stainless steel, with superior resistance to chloride corrosion, seawater salt spray and chemical medium erosion. It is non-magnetic, high-temperature sterilizable and durable in harsh corrosive environments, meeting the strict industrial anti-corrosion standards.

Applications: Dedicated to severe corrosion working conditions, widely used in marine miniature sensing equipment, chemical micro-instruments, high-grade medical disinfection components and professional anti-corrosion micro transmission devices.

Product Core Advantages

• Upgraded Heavy-Duty Structure: Optimized internal structure enhances load capacity and structural rigidity, effectively solving the fatigue and damage problems of ordinary miniature bearings under long-term continuous load operation.

• Standard Inch-Size Compatibility: Strictly follows imperial size standards, achieving perfect matching and assembly compatibility with all kinds of inch-system precision equipment and industrial model machinery.

• All-Round Environmental Adaptability: Three sealing configurations paired with five material grades can freely adapt to dry, dusty, humid, hygienic and corrosive working scenarios, with strong industrial universal performance.

• High-Precision Stable Operation: Fine-polished raceway and optimized steel ball matching structure reduce running friction and vibration, ensuring low-noise and high-precision long-term stable rotation output.