SF-1 Steel Backed Sintered Bronze PTFE Composite Self Lubricating Wrapped Sleeve Bushing Applicable To The Construction Machinery Industry

1. Product Structure
SF-1 (DU) bushing is a three-layer composite self-lubricating bearing, widely applied in mechanical oscillating and sliding friction positions.
Backing Layer: Low-carbon steel base, providing high mechanical strength and rigidity
Intermediate Layer: Sintered spherical bronze powder layer (0.20~0.35mm), excellent thermal conductivity and bonding performance
Surface Lubricating Layer: PTFE + lead composite coating (0.01~0.03mm), forms a permanent solid lubricating film during operation
Outer Surface Treatment: Copper/tin plating for rust and corrosion resistance
2. Material & Performance Features
Self-Lubricating & Maintenance-Free: The PTFE surface layer transfers to the shaft surface to form a stable lubricating film, adapting to oil-free or minimal grease working conditions, effectively preventing shaft seizure and abrasion.
Low Friction & No Crawling: Similar static and dynamic friction coefficient, excellent performance for low-speed oscillating motion, no stuck or crawling phenomenon.
High Strength & Stable Dimension: Steel back ensures high load-bearing capacity; low water absorption guarantees stable dimensional accuracy in complex environments.
Corrosion Resistant: Anti-rust plating and chemical-resistant surface layer adapt to outdoor and harsh working environments.
3. Application Scenarios
Widely used in engineering machinery hinge points, cylinder ear bushes, swing arm bearings, automotive parts, hydraulic equipment, and general mechanical sliding parts. Perfect replacement for hardened steel bushings (e.g., CASE 135248A1) for swing cylinder hinge positions.
4. Advantage Comparison vs. Original Hardened Steel Bushing
Original steel bushing: Requires continuous grease lubrication, easy to scratch the shaft once lack of oil
SF-1 DU bushing: Supports dry operation, protects the pin shaft effectively, reduces daily maintenance frequency