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Home / Product / SF-1 Oilless Bearing / SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems
Wholesale SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems
SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems
  • SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems

SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems

Product Description:

SF-1B is of high safety factor and is particularly appropriate for high-temperature environments where no oil is efficient and where the machine must be under successive long-period working conditions. This is widely used in the steel metallurgy industry such as bushes for roller grooves of successive casting machines. cement grouting pumps and screw conveyors for cement. It can also be composed in steel housing or fabricated into flanged bushes which can move both in radial and in axial directions.

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SF-1B

SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems

Bronze backed composite shell / PTFE lined / marine and hydraulic duty / drawing based supply
140 Dynamic load N/mm²
0.04-0.18 Friction coefficient
280 Max temp °C
Product Overview

The SF-1B bushing is a bronze backed PTFE lined oilless plain bearing developed for marine and hydraulic systems where the bearing shell is exposed to salt laden air, seawater splash, or hydraulic fluid leakage. The shell uses a bronze backing rather than steel, which removes the rust risk that governs service life in wet duty and provides inherent corrosion resistance without relying on plating integrity. A sintered bronze interlayer bonds the PTFE based sliding layer to the backing, giving dry running capability with a friction coefficient between 0.04 and 0.18 and dynamic load capacity up to 140 N/mm². Because the backing is bronze throughout, edge damage or coating wear at the housing interface does not initiate rust creep. Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and groove or hole provisions, with dimensional and material records available for project documentation.

Shell Backing SF-1B Bronze Steel Backed Variant
Corrosion at shell Inherent, no coating dependency Depends on plating integrity
Edge damage behavior No rust initiation Rust creep from exposed steel
Thermal conductivity Higher, better heat path Lower, heat retained at contact
Galvanic behavior Compatible with bronze housings Requires attention with bronze
Relative cost Higher material cost Lower material cost
Core Advantages
Bronze backing removes rust risk without depending on plating integrity PTFE lining permits dry running in hydraulic assemblies Higher thermal conductivity supports heat removal at the contact Stable friction from -200°C to 280°C Compatible with bronze and stainless housing materials Suitable for splash, spray, and condensation exposed positions
Product Characteristics
Structure: bronze backing, sintered bronze, PTFE lining Friction coefficient: 0.04 to 0.18 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 Positions where shell corrosion rather than lining wear limits life
Marine Deck Gear Davit pivots, winch support bushings, and hatch hinge points exposed to salt laden air and seawater splash.
Hydraulic Systems Rod guide bushings and pivot joints where fluid leakage or washdown moisture reaches the bearing shell.
Offshore Equipment Deck machinery and subsea tooling linkages where repair access is limited and corrosion allowance is small.
Washdown Machinery Food and beverage equipment cleaned with water jets, where plated steel shells degrade at damaged edges.
Supply and Customization Bushings are produced to drawing for inner diameter, outer diameter, wall thickness, length, chamfer, and lubrication groove or hole positions. Production batches are supported with dimensional inspection records covering bore tolerance, wall thickness variation, and lining adhesion, together with material composition records for the bronze backing. Prototype quantities and volume orders are both accepted, and packaging can be aligned with incoming inspection requirements.
ID: 3-300mm Backing: Bronze Grooves or Holes: Optional Documents: On Request
Frequently Asked Questions

A bronze backing is preferred where salt spray, seawater splash, or repeated washdown can damage plating at edges or during press fit. Where the shell corrosion path is not credible and cost is the deciding factor, a plated steel variant remains appropriate.

Housing bore is machined to ISO H7 as with steel backed variants. Bronze has a lower elastic modulus than steel, so interference is adjusted to remain within the elastic range of the backing. Press force is applied to the full face with a flat mandrel.

Yes. The PTFE lining is designed for dry running. Where seals allow film carryover, residual hydraulic fluid acts as a supplemental medium. Where the cavity is fully dry, the 3.6 N/mm²·m/s PV limit and 2 m/s sliding speed limit apply.

Bronze in contact with stainless steel is generally acceptable in marine positions. Where an aluminum housing is used, isolation or a compatible coating should be considered, and this can be reviewed during project selection.

Replace when the PTFE lining is worn through and the interlayer becomes visible, when radial clearance exceeds the assembly limit, or when friction and operating noise increase noticeably. Because the backing is bronze, shell corrosion is not part of the assessment.

SF-1B Bronze Backed PTFE Lined Oilless Marine and Hydraulic 140 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
- Safety: High safety factor
- Environment: Suited for high - temp, oil - inefficient conditions
- Workability: Withstands long - term continuous work
 
Applications
- Steel: Bushings for casting machine roller grooves
- Cement: In grouting pumps and screw conveyors
- Mechanics: In steel housings or as flanged bushings (radial/axial movement)

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Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd.
Zhejiang Shuangnuo Bearing Technology Co., Ltd. is China SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems Suppliers and Wholesale SF-1B Bronze Backed PTFE Lined Oilless Bushing, Corrosion Resistant Self-lubricating Sliding Bearing for Marine & Hydraulic Systems 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.
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    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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