Web Menu

Product Search

Language

Share

Home / Product / SF-1 Oilless Bearing / SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery
Wholesale SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery
SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery
  • SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery

SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery

Product Description:

SF-1W is wall wrapped bearing made of triple-layer composite material which consists of a steel backing, a sintered porous bronze particles interlayer and
calendared with PTFE and mixture as a surface layer, It is of low friction coefficient, anti-wear, 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, SF-1 is widely applied in various sliding articles of different kinds of machines, such as textile machines, tobacco machines, hydraulic vehicles, antomobiles, agriculture and forests machines, and so on.

Contact Us
PREV：SF-2 DX Boundary Lubricating Bushing, Steel Backed POM Composite Split Sliding Bearing
NEXT：SF-1P Reciprocating Motion Composite Bushing, DD2 Oilless Plain Bearing
SF-1W Lead-Free RoHS Compliant Food & Pharma

SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery

Metal-Polymer Composite Lead-Free Formulation Drawing Based Production
140 Dynamic load, N/mm²
0.04-0.18 Friction coefficient
<1000 ppm lead content, mg/kg
Product Overview

The SF-1W bushing is a lead-free metal-polymer composite plain bearing developed for food processing and pharmaceutical machinery, where lubricant leakage, material traceability, and restricted substances control are decisive selection criteria. The construction combines a steel backing, a sintered bronze interlayer, and a PTFE sliding layer formulated without lead additions. The lead-free formulation retains the low friction behavior of the SF-1 family, with a coefficient between 0.04 and 0.18 and dry running capability that removes grease from the hygiene zone. The steel backing carries dynamic loads up to 140 N/mm² and holds bore geometry stable in thin-wall housings. Bushings are produced to drawing with documentation support covering material composition and RoHS conformity, and custom inner diameter, wall thickness, length, flange, and plating configurations are accepted for project programs.

01
Lead-Free PTFE Sliding Layer PTFE compound formulated without lead additions. Provides dry running capability and a friction coefficient of 0.04 to 0.18.
Sliding surface
02
Sintered Bronze Interlayer Porous bronze structure bonds the PTFE layer to the steel backing and conducts frictional heat away from the contact zone.
Bonding and heat path
03
Steel Backing Cold rolled steel base provides structural rigidity, press fit stability, and high static load capacity in thin wall sections.
Structural base
04
Corrosion Protection Layer Tin or copper plating on the outer diameter for washdown environments and improved press fit behavior.
Outer diameter
Core Advantages
Lead-free PTFE formulation supports RoHS conformity and restricted substance programs Dry running removes grease from food contact and cleanroom areas Steel backing maintains bore geometry under load in thin wall housings Stable friction across a wide temperature range from -200°C to 280°C Washdown compatible when supplied with outer diameter plating Batch geometry control supports automated press fit assembly
Product Characteristics
Structure: steel backing, sintered bronze, lead-free PTFE layer 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 PV value: 3.6 N/mm²·m/s dry running Bore tolerance: ISO H7 to H8 by size class
Application Scenarios
Food Processing Filling and dosing machine linkages Conveyor guide and tensioner bushings Packaging jaw pivot joints Bottle handling guide elements
Pharmaceutical Machinery Tablet press guide bushings Blister packaging pivot points Cleanroom actuator linkages Sterile filling line joints
General Industrial RoHS restricted product assemblies Office and laboratory equipment Medical device pivot bushings Custom composite bearing projects
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, flange configuration, plating, and packaging. Production batches are supported with dimensional inspection records and material composition declarations covering RoHS conformity. Packaging and labeling can be aligned with incoming inspection requirements and production line presentation.
ID: 3-300mm Wall: 0.5-5mm Plating: Tin or Copper Documents: RoHS Declaration
Frequently Asked Questions Selection and validation inquiries from OEM engineering teams

The PTFE sliding layer is formulated without lead additions. Material composition declarations can be supplied with production batches to support RoHS conformity documentation. Where specific restricted substance thresholds apply, these can be confirmed during project review.

Yes. The lead-free PTFE lining is designed for dry running. During the initial operating period, PTFE transfers to the mating shaft and forms a low friction film. Dry running limits are 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. Hard chrome plated or stainless shafts with suitable hardness are common in washdown positions. Soft stainless grades should be evaluated during prototype testing.

Tin or copper plating improves corrosion resistance and press fit behavior. Housing bore is machined to ISO H7. Press fit reduces the bore diameter slightly depending on wall thickness, so specify the post installation clearance requirement where tight tolerances apply.

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 and then applied to maintenance planning.

Series SF-1W
Structure Steel / Bronze / Lead-Free PTFE
Compliance RoHS Declaration Available
Dynamic Load 140 N/mm²
Customization Drawing Based
Max.load Static   250N/mm²
Very low speed   140N/mm²
Roatating oscilating   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
Thermalconductivity   42 W(m•k)-1
Coefficient of thermal expansion   11×10-6•K-1

Features
1. Material: Triple - layer composite (steel, bronze, PTFE - mixture)
2. Traits: Low friction, anti - wear, anti - corrosion
3. Operation: Oil - free or minimal oil
4. Cost & Physicals: Low - cost, low - vibration, low - noise, compact, light
 
Applications
Textile, tobacco, hydraulic, automotive, agriculture and forestry machines

Our Product //
Related Product
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery Suppliers and Wholesale SF-1W Lead-Free PTFE Composite Bushing, RoHS Compliant Self-lubricating Oilless Plain Bearing for Food & Pharma Machinery 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.

  • 0+
    Happy Clients

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

Our News //
News & Insights.
VIEW MORE
Our Honor //
Honor.
VIEW MORE