LSF209 2F Square 4-Bolt Flange Bearing Unit, Double Set Screws, Double 2F

1. Product Overview

LSF 209 2F square four-bolt cast iron flange bearing assembly, matched with SU209-2F double set screw insert bearing. Equipped with double-sided 2F composite sealing combining metal flinger and NBR rubber lip to achieve two-stage mud and dust isolation. Two symmetric M10 set screws lock inner ring evenly, stable for forward and reverse rotation under heavy continuous vibration. Spherical outer ring provides ±2.5° self-aligning capacity to absorb shaft installation deflection and misalignment. Double-layer sealing effectively blocks mud, crop residues, workshop dust and splashing water. Side grease nipple supports periodic re-lubrication. Widely applied in heavy agricultural machinery, heavy-duty belt conveyors, food packaging equipment and large textile transmission rollers.
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2. Key Advantages

• Dual 2F anti-fouling sealing system: Outer metal flinger throws off mud and large debris by centrifugal force; inner rubber lip blocks fine dust, moisture and water mist, much better anti-pollution performance than single 2S rubber seals for outdoor muddy working conditions.
• Double M10 symmetric set screw locking design, uniform circumferential clamping force, anti-loose under long-term heavy vibration, no scratch on shaft surface, applicable to equipment with frequent positive and negative rotation.
• HT200 grey cast iron square four-hole flange housing, high rigidity, flat mounting surface for quick bolt fixing, compact overall structure to save equipment layout space, easy to disassemble for maintenance.
• ±2.5° self-aligning spherical outer ring eliminates extra internal stress caused by shaft offset, reduces abnormal bearing wear and running noise.
• Reserved side grease fitting for periodic supplementary lubrication, extend bearing service life and reduce equipment maintenance downtime.
• GCr15 fully quenched bearing steel, stable heavy radial load capacity, excellent wear and impact resistance.
• Standard metric unified dimensions, fully interchangeable with ordinary single-seal LSF209 bearing unit for mud-proof sealing upgrade.

Lower maintenance frequency and ensure long-term stable operation of heavy agricultural and industrial machinery

3. Applications

• Heavy rotary tillers, large grain drying and sorting equipment, large lawn maintenance machines
• Heavy-duty belt conveyors, feed processing equipment, food packaging production lines
• Heavy textile looms, large transmission rollers for light industrial processing
• Indoor and semi-outdoor equipment running in dusty, humid and muddy harsh environments

4. Technical Specifications

Dimension drawings and technical data sheets can be provided upon request

5. Why Choose GQZ Bearing

• 25+ years professional manufacturer of double 2F sealed square four-bolt set screw flange bearing units
• Products exported to more than 50 countries worldwide
• Support OEM customized anti-rust coating, surface painting and personalized sealing improvement
• Full pre-shipment inspection including mud resistance, set screw locking stability and load durability test
• Fast formal quotation and one-on-one professional heavy-duty bearing technical support within 24 hours for all RFQs
• Stable mass production capacity to meet long-term bulk order demands

We supply stable high-quality bearings, timely 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 testing
• 2F double seal mud and dust resistance cycle aging durability test
• Set screw 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 complete bearing units pass multi-process strict quality inspection before delivery

8. FAQ