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Wholesale SF-1 DU Oilless Bushing, Steel Backed PTFE Lined Self-lubricating Composite Sliding Bearing

SF-1 DU Oilless Bushing, Steel Backed PTFE Lined Self-lubricating Composite Sliding Bearing

Product Description:

SF-1 is wall wrapped bearing made of triple-layer composite material which consists of a steel backing, a sintered porous bronze particles interlayer, and calendared and mixture as a surface layer, It has of low friction coefficient, anti-wear, and anti-corrosion and can be used without oil, or only a trace of oil if needed. Moreover, it is of low cost, low vibration and low noise, compacted and light. It is widely applied in various sliding articles of different kinds of machines, such as textile machines, tobacco machines, hydraulic vehicles, automobiles, agriculture and forest machinery, and so on.

SF-1 DU Steel Backed PTFE Lined Composite Bearing

SF-1 DU Oilless Bushing, Steel Backed PTFE Lined Self-lubricating Composite Sliding Bearing

OEM and Project Supply Batch Consistency Control Drawing Based Customization
140 N/mm² Dynamic Load
3.6 PV Limit N/mm²·m/s
280 Max Temp °C
Product Overview

The SF-1 DU bushing is a three layer composite sliding bearing consisting of a steel backing, a sintered bronze interlayer, and a PTFE based sliding layer. The structure is suited to volume production programs where consistent wall thickness, bore tolerance, and lining adhesion are critical. The PTFE lining permits dry running with a friction coefficient between 0.04 and 0.18, while the steel backing supports dynamic loads up to 140 N/mm² and maintains dimensional stability in thin wall housings. Bushings are supplied to drawing for inner diameter, outer diameter, length, wall thickness, flange geometry, and plating options, supporting both standard catalog replacement and new project development.

L1 PTFE Sliding Layer PTFE based compound with filler materials. Provides dry running capability, low friction, and controlled wear rate against hardened shafts.
L2 Sintered Bronze Interlayer Porous bronze structure bonds the lining to the steel backing and conducts frictional heat away from the sliding surface.
L3 Steel Backing Cold rolled steel base delivers structural rigidity, press fit stability, and high static load capacity in thin wall sections.
L4 Surface Treatment Tin or copper plating on the outer diameter for corrosion protection and improved press fit behavior in humid environments.
Core Advantages
  • Composite structure combines steel rigidity with PTFE low friction behavior
  • Dry running capability removes lubrication maintenance from the assembly line
  • Thin wall design reduces housing space and overall component weight
  • Stable friction across wide temperature range from -200°C to 280°C
  • Compatible with oil and grease lubrication for extended service intervals
  • Consistent batch geometry supports automated press fit assembly
Product Characteristics
  • Structure: steel backing plus sintered bronze plus PTFE lining
  • Friction coefficient: 0.04 to 0.18 depending on load and speed
  • Static load capacity: up to 250 N/mm²
  • Dynamic load capacity: up to 140 N/mm²
  • Maximum sliding speed: 2 m/s dry, higher with oil lubrication
  • Bore tolerance: ISO H7 to H8 by size class
Application Scenarios
Automotive pedal and hinge bushings Hydraulic and pneumatic cylinder guides Agricultural machinery linkage points Packaging machinery pivot joints Textile machinery guide elements Office equipment slide bearings Door and window hardware pivots Custom composite bearing assemblies
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, flange configuration, lining grade, and surface treatment. Production batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, and lining adhesion. Packaging and labeling can be aligned with customer production line requirements. Prototype quantities and volume orders are both accepted.
ID: 3-300mm Wall: 0.5-5mm Plating: Tin or Copper Documentation: On Request
Frequently Asked Questions

Yes. The PTFE lining is designed for dry running. During initial operation, PTFE transfers to the mating shaft and forms a low friction film. Dry running is limited to a maximum PV of 3.6 N/mm²·m/s and a sliding speed of 2 m/s.

Recommended shaft hardness is 200 to 600 HV with surface roughness Ra 0.2 to 0.4 micrometers. Hardened and ground steel or hard chrome plated shafts provide the longest lining service life and the most stable friction behavior.

Housing bore is machined to ISO H7. Press fit reduces the bore diameter slightly depending on wall thickness. For tight clearance applications, specify the post installation clearance requirement so the delivered bore tolerance can be adjusted accordingly.

Yes. PTFE lining grade, filler composition, and outer diameter plating can be specified for project requirements. Plating options include tin and copper for corrosion protection and press fit behavior.

Replace when the PTFE lining is worn through and the bronze interlayer becomes visible, when radial clearance exceeds the assembly limit, or when friction and operating noise increase noticeably. Replacement intervals can be defined during prototype validation.

Max. load Static   250N/mm²
Very low speed   140N/mm²
Rotating oscillating   60N/mm²
Max.PV(dry running) Short-term operation   3.6N/mm²•m/s
Continuous operation   1.8N/mm²•m/s
Temp. limit   -195℃~+280℃
Friction coefficient   0.05~0.20μ
Max. speed Dry running   2m/s
Hydrodynamic operation   >2m/s
Thermal conductivity   42W(m•k)-1
Coefficient of thermal expansion   11×10-⁶•K-1

Feature 
1. Likely made of durable materials for bearing use
2. Designed for smooth sliding motion, with installation - friendly holes
3. Good wear - resistance to withstand friction
 
Application 
1. Industrial machinery and conveyor systems
2. Automotive components like sliding doors and seats

Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-1 DU Oilless Bushing, Steel Backed PTFE Lined Self-lubricating Composite Sliding Bearing Suppliers and Wholesale SF-1 DU Oilless Bushing, Steel Backed PTFE Lined Self-lubricating Composite Sliding Bearing Company, we are a manufacturer specializing in producing various self-lubricating copper alloy products using centrifugal casting, continuous casting, metal mold casting, and other processes. Its main products include brass, aluminum bronze, tin bronze, and others produced according to national standard grades. It processes and produces various solid inlaid self-lubricating bearing products on this basis . At the same time, it uses sintering technology to produce bimetallic products and many other types of products. Since its establishment nearly 10 years ago, the company has focused on the research development, and production of various new self-lubricating bearings.

In the process of product production, our company has always insisted on independent casting production of raw materials to ensure the quality of products from the source; during the casting process, the whole process is monitored, and the finished product is tested by spectrometer three times before, in and after the furnace to confirm the material composition of the product. The national testing agency is regularly commissioned to test the material composition and mechanical properties of the product, and authoritative test reports can be provided to customers in need; the company implements integrated production from material to finished product processing and has more than 80 sets of advanced CNC machine tools, CNC lathes, machining centers, and other major equipment. The strong production capacity ensures that the material production is organized for customers for the first time, shortening the production cycle.
  • 0+
    Establishment

    Founded in 2014, Shuangnuo has 10 years of experience in the industry.

  • 0+
    Advanced Equipment

    Strong production capacity ensures that we can organize material production for customers as soon as possible and shorten the production cycle.

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    Happy Clients

    There are more than 5,000 cooperative customers around the world.

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