KSOB -1F Flanged Self-Lubricating Bushing

1. Product Introduction

SF-1F flanged bushing is a three-layer composite self-lubricating sliding bearing, also known as flanged oilless bushing. It is constructed with a cold-rolled steel backing, a sintered bronze powder intermediate layer, and a rolled PTFE + lead modified self-lubricating top layer. The bushing features an expansion split and a locating flange on one end.

The flange shoulder enables axial positioning and prevents the bushing from shifting into the housing bore during installation. The split design facilitates press fitting for interference assembly. It can operate under oil-free or low-lubrication dry friction conditions, replacing traditional bronze bushings and needle bearings to reduce lubrication maintenance work.

2. Applicable Industries

Construction machinery: Hydraulic cylinders, linkages, loaders, forklift hinge points

Automation equipment: Conveyors, lifting platforms, robot joints

Textile, printing & packaging machinery: Various oscillating and sliding shafts

Automotive components: Door hinges, seat adjusters, small chassis hinge points

Mold industry: Mold guidance and ejection sliding pairs

Agricultural machinery, door & window hardware, fitness equipment, etc.

3. Product Performance

Self-lubricating & maintenance-free: The surface PTFE solid lubricating film delivers a low starting friction coefficient. It can run dry without oil, and occasional grease lubrication can further extend service life.

High load capacity: Composite structure of steel backing and bronze powder provides high radial load resistance, ideal for heavy-load, low-speed oscillating / reciprocating motion.

Flange positioning design: The flanged shoulder provides direct axial limit, eliminating retaining rings and simplifying component structure.

Wear resistance & anti-seizure: Bronze layer offers good thermal conductivity for fast heat dissipation and prevents shaft scoring.

Stable dimension: Split structure compensates assembly tolerance after press fitting, suitable for mass press-fit installation.

Operating conditions: Suitable for low-speed, reciprocating and oscillating movement; not recommended for continuous high-speed rotation.

Material structure: Steel backing + porous bronze powder layer + PTFE composite surface layer

4. Q&A

Q1: Must this bushing be used with lubrication?

A: No. SF-1F is an oilless self-lubricating bushing with built-in solid lubricant on the surface for dry running. Periodic light greasing can further extend service life.

Q2: What is the function of the flange?

A: The flange acts as an axial locating shoulder. After being pressed into the housing bore, the flange sits against the end face to stop the bushing from being pushed axially into the hole, removing the need for separate limit washers or retaining rings.

Q3: Can non-standard ID / OD / length be customized?

A: Custom non-standard dimensions are available. We can machine different flange thicknesses and bushing lengths per drawings. Standard sizes are in stock with shorter lead times.

Q4: What material is recommended for the mating shaft?

A: Quenched and tempered steel or hardened steel shaft is recommended, surface roughness Ra ≤0.8. Soft shafts (pure aluminum, soft copper) should be avoided as they are prone to shaft wear.

Q5: What is the difference between SF-1F and standard straight SF-1 bushing?

A: SF-1 is a straight shoulderless bushing. SF-1F has an added flange for applications requiring axial positioning to prevent displacement after installation.

Q6: What is the maximum pressure it can withstand?

A: Max static pressure reaches 250MPa. Dynamic load is suggested below 100MPa. It is designed for low-speed heavy-load applications and not for continuous high-speed rotation.

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