Discover the Customizable Precision of PTFE Composite Bushings, Custom-designed together
Maintenance-free Plain Bearings
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Self Lubricating Bearings，PTFE Composite Bushings, Working collaboratively. Solving together.
PTFE composite bushings, available in both straight and flanged types, are revolutionizing industries with their robust performance and versatile sizing options, including both metric and inch measurements. Known for their self-lubricating and maintenance-free nature, these bushings are an ideal choice for applications requiring minimal friction and long service life. Their ability to handle heavy radial loads despite their compact design makes them perfect for applications involving slow rotational or oscillating movements. Furthermore, their exceptional dimensional stability and thermal conductivity ensure reliable operation under varied environmental conditions.
We are committed to continuously introducing successful products to the market, including metal polymer, plain bearings and metal/bimetal plain bearings of various materials, and provide high-quality tribological optimization solutions for customers in many fields such as construction machinery, and energy. We manufacture an extensive range of standard inch and metric self-lubricating bearings, available in both journal and thrust configurations. This distinctive bearing product provides users with design flexibility and cost advantages due to its “maintenance-free” properties.
Coiled steel journal bearings are designed with a unique construction to meet industry standards for self-lubricating bushings.
Selection Guide, Coiled Steel Backing, Thin-Walled Coiled Steel Backing. Coiled steel journal bearings are designed to meet industry standards for self-lubricating bushings.The core structure of PTFE composite bushings features a sheet steel backing, onto which a porous layer of tin/bronze, ranging from 0.2 to 0.4 mm in thickness, is sintered. This is not just any layer; through a meticulous rolling process, the pores of this sintered layer are filled with a fine mixture of PTFE (polytetrafluoroethylene) and molybdenum disulphide. The outcome is a critical running-in layer that can vary from 5 to 50 μm in thickness, which significantly enhances the mechanical robustness of the tin/bronze and the superb sliding and lubricating properties of the PTFE blend.
A PTFE bushing serves as a thrust washer or cylindrical bearing for various valve types, such as butterfly or ball valves. It offers low and consistent friction over an extended lifetime and provides high corrosion resistance.
Metric Journal bearings, coiled steel backing, Optimized for Customization
Our bearings are metal-reinforced, self-lubricating plain bearings featuring a low-friction PTFE layer. They offer market-recognized performance across various applications.
One of the standout features of PTFE composite bushings is their adaptability to custom sizes, accommodating specific requirements for unique applications. Whether your engineering project demands peculiar dimensions or special performance criteria, these bushings can be tailored to meet precise specifications, providing an optimized solution that standard sizes cannot always offer.
This bearing is metal-reinforced and self-lubricated with a layer of low-friction PTFE, making it suitable for applications where plain and conventional rolling element bearings are typically used.
A PTFE bushing designed as a half-shell is utilized within axial piston pumps, offering high load capabilities and consistently low friction under lubricated conditions. The self-lubricating thrust and journal bearings are ideal for scenarios where regular lubrication is impractical or expensive. Designed for oscillating motion, intermittent start-stop, or axial movement, our PTFE-lined thrust and journal bearings excel under high loads paired with low surface speeds. Additionally, these PTFE bushings are suitable for use in environments where non-lubricating fluids are present.
Coefficient of friction, Design customization
Every new PTFE composite bushing undergoes a vital initial phase known as the running-in period. During this short duration, minute particles of the PTFE from the running-in layer are systematically transferred to the counter surfaces in contact with the bushing. This transfer is crucial as it allows the bushing to achieve its characteristic low friction and superior wear resistance, setting the stage for optimal performance throughout its lifespan.
PTFE, compared to other materials, boasts one of the low coefficients of friction. Designed to migrate onto the shaft, PTFE particles facilitate a smooth and consistent operation of the joint throughout the assembly’s lifespan. PTFE Bearings, in combination with a sizing procedure, can help to eliminate the issues that you may have with tolerance.
The hinges pivot employs a PTFE bearing to eliminate free play and maintain constant torque. The flanged PTFE bushings are designed to support both axial and radial loads, ensuring consistent operation throughout the entire lifecycle. Customized Bearings and tailor-made components.
Bushing Material, Material solutions end to end
From material to solution, we engage in thorough research and testing, collaborating closely with engineers to provide a customized design and perfect fit. This approach helps to address your specific challenges and enhance your applications across any industry. Our unique materials lead to smarter, more resilient systems.
PTFE Straight Bush and Flanged Bush: Key Features and Applications
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PTFE (Polytetrafluoroethylene) Characteristics:
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Self-lubricating: Reduces friction without external lubrication, ideal for maintenance-free operation.
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Chemical Resistance: Resists most chemicals and solvents.
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High-Temperature Tolerance: Operates effectively in a wide temperature range (-200°C to +260°C).
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Straight Bush:
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Design: Cylindrical sleeve without a flange, used for radial load support.
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Applications: Suitable for simple bearing applications where axial positioning is not critical, such as in hinges or pivots.
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Flanged Bush (ISO 3547 Compliant):
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Design: Includes a flange (protruding rim) for axial retention and load distribution. Combines a steel backing with a PTFE lining.
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Steel Backing: Provides structural strength, prevents deformation under high loads, and allows press-fit installation.
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ISO 3547: Specifies dimensions, materials, and performance for wrapped bushes, ensuring interoperability and durability. Typically involves a steel strip wrapped and bonded with PTFE.
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Maintenance-Free Advantage:
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PTFE’s self-lubricating properties eliminate the need for regular lubrication, reducing downtime and costs in hard-to-access applications.
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Applications:
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Automotive: Suspension systems, steering linkages.
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Industrial Machinery: Conveyors, pumps, and agricultural/construction equipment exposed to harsh environments.
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General Engineering: Where high load capacity and minimal upkeep are required.
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Installation Considerations:
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Press-Fit: Steel backing ensures secure installation into housings.
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Corrosion Resistance: Steel may be coated or stainless for moisture-prone environments.
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Performance Factors:
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Load Capacity: Steel backing supports higher radial/axial loads than polymer-only bushings.
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Thermal Stability: PTFE handles temperature extremes, while steel manages structural integrity.
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Conclusion: The PTFE flanged bush (ISO 3547) with steel backing is optimized for heavy-duty, maintenance-free applications requiring durability and reliability. The straight bush suits simpler radial bearing needs. Both leverage PTFE’s low friction and chemical resistance, enhanced by steel for mechanical robustness.
Design customization, Custom PTFE Composite Bushings, Flexible. Adaptable. Tailored.
Custom PTFE Composite Bushings: Design Flexibility & Tailored Solutions
PTFE composite bushings combine advanced engineering with material innovation to deliver adaptable, high-performance solutions for demanding applications. Their customizable design and layered structure make them ideal for industries requiring precision, durability, and compliance with strict standards. Below is a detailed breakdown of their features, benefits, and applications:
1. Multi-Layer Composite Structure
The triple-layer wall-wrapped bushing is engineered for optimal performance:
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Steel Backing: Provides structural rigidity, dimensional stability, and press-fit installation compatibility.
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Sintered Bronze Interlayer: Creates a porous matrix for improved bonding and load distribution.
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PTFE Surface Layer: Delivers ultra-low friction (µ as low as 0.02), wear resistance, and self-lubrication.
This layered design enhances load capacity, thermal stability, and corrosion resistance, even in harsh environments.
2. Key Advantages of Custom PTFE Composite Bushings
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Maintenance-Free Operation: Self-lubricating PTFE eliminates the need for external grease or oil (though trace lubrication can extend life in extreme conditions).
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Low Noise & Vibration: Ideal for applications requiring quiet operation (e.g., medical devices, automation).
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Lightweight & Compact: Reduces system weight while maintaining high strength-to-weight ratios.
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Cost-Effective: Long service life minimizes downtime and replacement costs.
3. Customization Capabilities
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Tailored Dimensions: Precision-engineered to match unique bore sizes, wall thicknesses, and flange configurations.
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Material Optimization: Adjust PTFE/bronze ratios or incorporate additives (e.g., glass fiber, carbon) for enhanced wear resistance, thermal conductivity, or electrical insulation.
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Surface Treatments: Optional coatings (e.g., MoS2, ceramic) to further reduce friction or improve corrosion resistance.
4. Industry Applications
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Automotive: Steering systems, suspension linkages, hydraulic cylinders.
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Industrial Machinery: Textile looms, tobacco processing equipment, agricultural machinery.
- Hydraulics/Pneumatics: Cylinder rods, piston guides.
5. Compliance & Testing
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Load Capacity: ISO 3547 standards.
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Chemical Resistance: Immersion testing in industry-specific media.
6. Why Choose Custom PTFE Bushings?
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Seamless Integration: Perfect fit reduces stress concentrations and premature wear.
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Enhanced Performance: Optimized for dynamic loads, oscillating movements, or high-speed rotation.
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Sustainability: Maintenance-free design reduces lubricant waste and environmental impact.
Conclusion: Custom PTFE composite bushings are a versatile, high-value solution for industries prioritizing reliability, noise reduction, and regulatory compliance. By leveraging tailored designs and PTFE’s unique properties, these components ensure longevity and efficiency in even the most aggressive operating environments.
For specialized applications, consult with engineers to validate material grades, dimensions, and testing protocols to meet exact operational needs.
The material you are describing seems to be a type of self-lubricating bearing or bushing, designed with a composite structure to provide high performance in various mechanical applications. This structure typically includes the following components:
- Steel Backing: Offers mechanical strength and durability.
- Sintered Porous Bronze Interlayer: Serves as a lubricant reservoir and enhances wear resistance.
- Calendered Mixture Surface Layer: Often made from materials like PTFE (polytetrafluoroethylene) mixed with fillers, this layer provides low friction properties.
These bearings offer several key advantages:
- Low Friction Coefficient: The PTFE surface allows for smooth operation with minimal resistance, making them ideal for applications where friction reduction is critical.
- Anti-Wear and Anti-Corrosion: The combination of bronze and PTFE provides excellent wear resistance and corrosion protection, thereby extending the bearing’s lifespan.
- Maintenance-Free Operation: Many of these bearings can operate without additional lubrication or with minimal lubrication, reducing maintenance needs and operational costs.
- Cost-Effectiveness: The materials and manufacturing processes used make these bearings relatively inexpensive compared to other types.
- Low Vibration and Noise: Their design helps reduce vibrations and noise during operation, which is especially beneficial in industrial applications.
- Compact and Lightweight Design: Their compactness and light weight make them suitable for a wide range of applications without adding significant weight to machinery.
These self-lubricating bearings are widely used in industries such as:
- Textile machinery
- Tobacco machinery
- Hydraulic vehicles
- Automobiles
- Agricultural and forestry machinery
The versatility and robust performance of these bearings make them ideal for applications where low maintenance and high durability are essential. They are particularly valuable in environments where traditional lubrication might fail or be impractical to use.
| Parameters | SF-1
Lead-Free |
SF-1W
Gear Pump |
SF-1P
Reciprocating |
SF-1B
Bronze-Based |
SF-1D
Hydraulic |
SF-1S
Stainless Steel |
|
| Load capacity(Dynamic) | 140 N/mm2 | 140 N/mm2 | 140 N/mm2 | 140 N/mm2 | 140 N/mm2 | 140 N/mm2 | |
| Load capacity(Static) | 250 N/mm2 | 250 N/mm2 | 250 N/mm2 | 250 N/mm2 | 250 N/mm2 | 250 N/mm2 | |
| Oscillating | 60 N/mm2 | 60 N/mm2 | 60 N/mm2 | 60 N/mm2 | 60 N/mm2 | 60 N/mm2 | |
| Speed limit(Oil) | 5 m/s | 10 m/s | 2.5 m/s | 5 m/s | 3 m/s | 4.5 m/s | |
| μ Friction Coef. |
0.04~0.20 | 0.04~0.20 | 0.04~0.20 | 0.03~0.18 | 0.04~0.20 | 0.04~0.20 | |
| PV limit(Dry) | 3.6 N/ mm2.m/s | 4.3 N/ mm2.m/s | 3.6 N/ mm2.m/s | 4.3 N/ mm2.m/s | 3.8 N/ mm2.m/s | 3.6 N/ mm2.m/s | |
| PV limit(Oil) | 50 N/ mm2.m/s | 60 N/ mm2.m/s | 50 N/ mm2.m/s | 60 N/ mm2.m/s | 50 N/ mm2.m/s | 50 N/ mm2.m/s | |
| Temp. Limit | -295℃ ~ +280℃ | -195℃ ~ +280℃ | -195℃ ~ +280℃ | -195℃ ~ +300℃ | -195℃ ~ +280℃ | -295℃ ~ +270℃ | |
| Thermal conductivity | 13 W/m·k | 13 W/m·k | 13 W/m·k | 18 W/m·k | 16 W/m·k | 16 W/m·k | |
| Linear expansion | 11 ×10-6/K | 11 ×10-6/K | 11 ×10-6/K | 21 ×10-6/K | 15 ×10-6/K | 15 ×10-6/K | |
Outer Diameter Tolerance for Bushing with Standard Metric Sizes (mm)
| Outside Diameter (d) mm | Tolerance (mm) |
|---|---|
| ≤ 10 | +0.055 / +0.025 |
| 10 < d ≤ 18 | +0.065 / +0.030 |
| 18 < d ≤ 30 | +0.075 / +0.035 |
| 30 < d ≤ 50 | +0.085 / +0.045 |
| 50 < d ≤ 80 | +0.100 / +0.055 |
| 80 < d ≤ 105 | +0.120 / +0.070 |
| 105 < d ≤ 180 | +0.170 / +0.100 |
| 180 < d ≤ 250 | +0.210 / +0.130 |
| 250 < d ≤ 305 | +0.260 / +0.170 |
