Home / Product / SF-1 Oilless Bearing / SF-1S Stainless Steel Backed PTFE Oilless Bushing, High Corrosion Resistant Self-lubricating Sliding Bearing for Chemical & Marine Equipment
Wholesale SF-1S Stainless Steel Bearing

SF-1S Stainless Steel Backed PTFE Oilless Bushing, High Corrosion Resistant Self-lubricating Sliding Bearing for Chemical & Marine Equipment

Product Description:

SF-1S is oil-resistant, acid-resistant, alkali-resistant, and seawater resistant. more over, there is no lead in the PTFE surface layer and so is particularly ft for bearings in food stuff machines, alkali flow meters, pumps motion elements in pharmaceutical machines, printing machines chemical engineering machines, and other ocean industries.

SF-1S

SF-1S Stainless Steel Backed PTFE Oilless Bushing, High Corrosion Resistant Self-lubricating Sliding Bearing for Chemical & Marine Equipment

Backing Stainless steel
Lining PTFE compound
Dynamic load 120 N/mm²
Supply To drawing
Product Overview

The SF-1S bushing is a stainless steel backed PTFE lined oilless plain bearing built for chemical processing and marine equipment where both the process medium and the ambient atmosphere attack conventional steel shells. The shell uses a stainless steel backing with a sintered bronze interlayer and a PTFE based sliding layer, so the outer diameter requires no plating and cannot develop rust creep at damaged edges, machined faces, or press fit witness marks. The PTFE lining supports dry running with a friction coefficient between 0.04 and 0.18. Because the stainless backing has a lower elastic modulus than carbon steel, dynamic load capacity is rated at 120 N/mm², with a maximum PV of 3.0 N/mm²·m/s in dry running. Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and groove or hole provisions, with material certificates available for project documentation.

A
Chemical Exposure Stainless backing withstands splash, vapour, and cleaning agents that would strip plating from carbon steel shells. Lining selection is reviewed against the specific medium.
B
Marine Atmosphere Salt laden air and seawater splash do not initiate rust on the shell surface. No coating integrity dependency at edges or machined faces.
C
Lower Modulus Backing Stainless steel has a lower elastic modulus than carbon steel. Interference and rated dynamic load are adjusted so the shell remains within its elastic range.
D
Hygiene Compatibility No plating layer to chip or flake into the process stream. Lining and backing records support material declaration and hygiene review.
Core Advantages
Stainless backing removes plating dependency and rust creep at edges PTFE lining permits dry running without lubricant in the process area Suitable for chemical splash, vapour, and marine atmosphere duty No coating to chip or flake into the process stream Stable friction from -200°C to 280°C Material certificates available for hygiene and project review
Product Characteristics
Structure: stainless backing, sintered bronze, PTFE lining Friction coefficient: 0.04 to 0.18 Static load capacity: up to 220 N/mm² Dynamic load capacity: up to 120 N/mm² Maximum PV value: 3.0 N/mm²·m/s dry running Bore tolerance: ISO H7 to H8 by size class
Application Scenarios Positions where the medium or atmosphere attacks the shell rather than the lining
Chemical Processing Pump shaft bushings, valve stem guides, and agitator pivot joints exposed to splash, vapour, and cleaning agents.
Marine Equipment Deck machinery pivots, davit bearings, and seawater exposed linkage bushings where plating fails at edges.
Pharmaceutical Plant Washdown exposed actuator bushings where chipped coating cannot be tolerated in the production area.
Water Treatment Chemical dosing pump linkages and valve actuation bushings in humid, vapour rich enclosures.
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and lubrication groove or hole positions. Batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, and lining adhesion, together with stainless steel grade records. Prototype quantities and volume orders are both accepted. Stainless grade can be specified to suit the medium, and lining formulation is reviewed where the process fluid requires confirmation.
ID: 3-200mm Backing: Stainless Steel Grade: To Specification Certificates: On Request
Frequently Asked Questions

A plated steel shell depends on coating integrity. Damage at edges, machined faces, or press fit contact areas exposes carbon steel and initiates rust creep. A stainless backing has no coating to damage, so corrosion resistance is not affected by handling or assembly.

Stainless steel has a lower elastic modulus than carbon steel, so the shell deforms more under the same load. Rated dynamic load is set at 120 N/mm² so that bore geometry and press fit interference remain within the elastic range.

Yes. The PTFE lining is designed for dry running. Where the pumped medium reaches the bearing through seal leakage, lining compatibility with that medium should be confirmed during selection. Where the cavity is fully dry, the 3.0 N/mm²·m/s PV limit and 2 m/s sliding speed limit apply.

Housing bore is machined to ISO H7. Interference is specified so the shell stays within its elastic range, taking the lower modulus of stainless into account. Press force is applied to the full face with a flat mandrel contacting the entire face rather than the bore edge.

Stainless grade records, lining composition data, and dimensional inspection records can be supplied with production batches. Where the application requires declaration of specific substances or contact suitability, this is reviewed during project selection.

SF-1S Stainless Backed PTFE Lined Oilless Chemical and Marine 120 N/mm² Dynamic Drawing Based Supply
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   42 W(m•k)-1
Coefficient of thermal expansion  11×10-⁶•K-1

Features
- Corrosion Resistance: Resistant to oil, acid, alkali, and seawater.
- Material Safety: No lead in the PTFE surface layer, ensuring safety.
 
Applications
- Food Industry: Suitable for bearings in food processing machines.
- Pharmaceutical and Printing: Used for motion elements in pharmaceutical and printing machines.
- Chemical and Ocean Industries: Applied in chemical engineering machines and other ocean - related industries.

Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-1S Stainless Steel Bearing Suppliers and Wholesale SF-1S Stainless Steel 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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