LEF203 2F Square 4-Bolt Flange Bearing Unit, Double 2F Flinger-Rubber Anti-Mud Seals

1. Product Overview

LEF 203 2F four-bolt square cast iron flange bearing unit, matched with YEL203-2F eccentric lock insert bearing with extended inner ring. Double-sided 2F composite seal adopts centrifugal metal flinger + NBR rubber lip two-stage barrier structure. Eccentric locking collar clamps extended inner ring firmly for stable one-way rotation. Spherical outer ring provides ±2.5° self-alignment to compensate shaft installation misalignment. Dual-layer sealing blocks light mud, crop dust, water splashes and workshop debris effectively. Side grease nipple supports periodic re-lubrication, widely used on mini farm machines, light belt conveyors, small packaging and textile equipment.

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2. Key Advantages

• Dual 2F anti-contamination sealing system: Metal flinger throws away mud and dust via centrifugal force; inner rubber lip isolates fine particles and moisture, better anti-fouling performance than single 2S rubber seals in slightly muddy working environments.
• Eccentric lock collar provides uniform full-circle clamping force, stable anti-slip under light continuous vibration, no scratch damage on shaft surface, designed for constant single-direction rotation.
• HT200 cast iron square four-hole flange housing, high rigidity, flat mounting surface, easy installation and disassembly, compact overall size saves equipment layout space.
• ±2.5° self-aligning spherical outer ring eliminates extra internal stress caused by shaft deflection and assembly offset, reduces abnormal wear and running noise.
• Side grease fitting enables regular supplementary lubrication, extends service cycle and lowers maintenance frequency.
• GCr15 fully heat-treated bearing steel with stable light radial load capacity, good wear resistance.
• Standard 17×40mm metric dimension, fully interchangeable with single-seal LEF203 bearing units for direct heavy dust/mud sealing upgrade.

Reduce maintenance workload and ensure long-term stable operation of light-duty machinery

3. Applications

• Mini rotary tillers, small grain sorting equipment, miniature lawn maintenance machinery
• Light-duty belt conveyors, small packaging production assembly lines
• Mini textile looms, light food processing transmission rollers
• Indoor & semi-outdoor light industrial equipment with dusty, slightly humid working conditions

4. Technical Specifications

Dimension drawings and technical data sheets can be provided upon request

5. Why Choose GQZ Bearing

• 25+ years professional manufacturing of double 2F sealed four-bolt square flange bearing units
• Products supplied to more than 50 countries worldwide
• Custom OEM anti-rust coating, surface paint and personalized sealing optimization schemes
• Full pre-delivery inspection covering mud resistance, locking tightness and load durability test
• Fast formal quotation and one-on-one professional technical support within 24 hours for all RFQs
• Stable mass production supply chain to meet long-term bulk order demands

We supply consistent stable quality, on-time delivery and long-term win-win cooperation with global buyers

6. Quality Assurance

• Raw bearing steel chemical composition and hardness inspection
• High-precision raceway grinding and surface roughness detection
• 2F double seal mud & dust resistance cycle aging durability test
• Eccentric collar anti-slip vibration impact test
• Dynamic load and low-noise continuous rotation performance test
• Full dimension sorting and 100% visual appearance inspection before packaging

All bearing units pass multi-process strict quality testing before shipment

8. FAQ