Composite Bushing – PTFE & POM Series | High-Performance Self-Lubricating Solutions
Discover our PTFE composite bushing and POM composite bushing series. Engineered for self-lubrication, high load capacity, and corrosion resistance. Custom sizes available. Request instant quote.
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Dry sliding composite bushing
PTFE & POM Solutions for Enhanced Performance
Composite bushings are an advanced bearing solution designed for high performance and durability across a wide range of industrial applications. They ensure stable, low-friction operation, even in environments where conventional lubrication is difficult or not feasible.
Built with a multi-layer construction—usually a steel backing for strength, a porous bronze layer for load support, and a low-friction PTFE or POM surface—composite bushings provide excellent wear resistance, reduced friction, and extended service life. Their self-lubricating design minimizes maintenance requirements and eliminates the need for external lubrication.
Composite bushings designed for heavy loads, dry running, and corrosion resistance. Ideal for automotive, construction, and machinery.
PTFE & POM lined composite bushing with steel backing
What is a Composite Bushing? Structure & Material Composition
A composite bushing is a type of metal-polymer composite plain bearing designed for self-lubricating or low-maintenance operation. Its robust construction typically comprises three distinct layers, each contributing uniquely to the bushing’s overall performance and durability:
- Steel Backing (Steel Backing): This foundational layer provides the primary mechanical strength and exceptional load-carrying capacity. Depending on the application requirements, this backing can be made from carbon steel, stainless steel, or even bronze, offering versatility in corrosive or specific environmental conditions.
- Sintered Bronze Interlayer (Sintered Bronze): A porous layer of sintered bronze powder is metallurgically bonded to the steel backing. This interlayer serves multiple critical functions: it ensures a strong, integral bond between the backing and the polymer sliding layer, effectively transfers heat away from the bearing surface to prevent overheating, and acts as a reservoir for the polymer material, enhancing its adhesion and stability.
- Polymer Sliding Layer (Polymer Layer, PTFE or POM): This outermost layer is crucial for the bushing’s tribological properties, providing low friction and wear resistance. The choice of polymer—Polytetrafluoroethylene (PTFE) or Polyoxymethylene (POM)—dictates the bushing’s lubrication requirements and performance characteristics.
PTFE Composite Bushing: PTFE Lined Composite Bushings (Dry Sliding)
PTFE Composite Bushings, often referred to as oil-free bearing solutions, are engineered for applications demanding completely dry running conditions. Their unique composition allows for exceptional performance without external lubrication.
- Material: Typically composed of a steel backing, a sintered bronze interlayer, and a PTFE/Lead mixture (or other PTFE-based compounds with fillers) as the sliding layer.
- Operation: Designed for dry sliding operation, meaning they can run effectively without any oil or grease. This makes them ideal for environments where lubrication is undesirable due to contamination risks or impracticality.
- Performance: Exhibits a remarkably low friction coefficient, excellent wear resistance, and a wide operational temperature range, typically from -195°C to +280°C. The PTFE layer creates a transfer film on the mating shaft during operation, which acts as a protective, low-friction interface.
- Best for: High load, low speed, and oscillating movements, particularly in inaccessible locations or applications where traditional oil lubrication is impossible or forbidden.
POM Lined Composite Bushings (Boundary Lubrication)
POM Composite Bushings, are designed for applications requiring boundary lubrication. While they are self-lubricating, they perform optimally with initial or intermittent grease lubrication.
- Material: Consists of a steel backing, a sintered bronze interlayer, and a Polyoxymethylene (POM, also known as Acetal) sliding layer. The POM layer is typically designed with specific grease pockets or oil indents.
- Operation: Requires initial grease (pre-lubricated) to establish a lubricating film. The surface features strategically placed grease pockets (oil indents) that retain lubricant, ensuring continuous lubrication under boundary conditions.
- Performance: Offers high load capacity and excellent impact resistance. With proper lubrication, it achieves a lower friction coefficient and superior wear resistance, making it highly durable in demanding environments.
- Best for: Heavy-duty applications, dirty or dusty environments, and chassis components where intermittent lubrication is acceptable and beneficial. Examples include agricultural machinery, construction equipment, and vehicle suspension systems.
POM Composite Bushing Size Chart
| Part No. | Nominal Diameter |
Wall thickness s3 |
Width B |
Shaft-ø DJ [h8] |
Housing-ø DH [H7] |
Bush-ø Di,a Ass. in H7 housing |
Clearance CD |
Oil hole-ø dL |
|||
| Di | Do | max. min. |
max. min. |
max. min. |
H7 | max. min. |
max. min. |
max. min. |
|||
| POM Composite 0808 | 8 | 10 | 0.980 0.955 |
8.25 7.75 |
h8 | 8.000 7.978 |
10.015 10.000 |
8.105 8.040 |
0.127 0.040 |
No hole | |
| POM Composite 0810 | 10.25 9.75 |
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| POM Composite 0812 | 12.25 11.75 |
||||||||||
| POM Composite 1010 | 10 | 12 | 10.25 9.75 |
10.000 9.978 |
12.018 12.000 |
10.108 10.040 |
0.130 0.040 |
3 | |||
| POM Composite 1012 | 12.25 11.75 |
4 | |||||||||
| POM Composite 1015 | 15.25 14.75 |
||||||||||
| POM Composite 1020 | 20.25 19.75 |
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| POM Composite 1210 | 12 | 14 | 10.25 9.75 |
12.000 11.973 |
14.018 14.000 |
12.108 12.040 |
0.135 0.040 |
3 | |||
| POM Composite 1212 | 12.25 11.75 |
4 | |||||||||
| POM Composite 1215 | 15.25 14.75 |
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| POM Composite 1220 | 20.25 19.75 |
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| POM Composite 1225 | 25.25 24.75 |
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| POM Composite 1415 | 14 | 16 | 15.25 14.75 |
14.000 13.973 |
16.018 16.000 |
14.108 14.0400 |
|||||
| POM Composite 1420 | 20.25 19.75 |
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| POM Composite 1425 | 25.25 24.75 |
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| POM Composite 1508 | 15 | 17 | 8.25 7.75 |
15.000 14.973 |
17.018 17.000 |
15.108 15.040 |
3 | ||||
| POM Composite 1510 | 10.25 9.75 |
||||||||||
| POM Composite 1512 | 12.25 11.75 |
4 | |||||||||
| POM Composite 1515 | 15.25 14.75 |
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| POM Composite 1520 | 20.25 19.75 |
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| POM Composite 1525 | 25.25 24.75 |
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| POM Composite 1615 | 16 | 18 | 15.25 14.75 |
16.000 15.973 |
18.018 18.000 |
16.108 16.040 |
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| POM Composite 1620 | 20.25 19.75 |
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| POM Composite 1625 | 25.25 24.75 |
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| POM Composite 1815 | 18 | 20 | 15.25 14.75 |
18.000 17.973 |
20.021 20.000 |
18.111 18.040 |
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| POM Composite 1820 | 20.25 19.75 |
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| POM Composite 1825 | 25.25 24.75 |
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| POM Composite 2010 | 20 | 23 | 10.25 9.75 |
20.000 19.967 |
23.021 23.000 |
20.131 20.050 |
0.164 0.050 |
6 | |||
| POM Composite 2015 | 15.25 14.75 |
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| POM Composite 2020 | 20.25 19.75 |
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| POM Composite 2025 | 25.25 24.75 |
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| POM Composite 2025 | 30.25 29.75 |
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For more detailed specification information, please contact our team at una@viiplus.com
PTFE Composite Bushing Size Chart
| Part No. | Nominal Diameter | Bush Wall S3 |
Length B |
Shaft-∅ DJ |
Housing−∅ DH | Ass. Inside-∅ Di,a |
Clearance CD |
|
| Di | Do | max. min. |
max. min. |
max. min. |
max. min. |
max. min. |
max. min. |
|
| PTFE Composite0203 | 2 | 3.5 | 0.745 0.725 |
3.25 2.75 |
2.000 1.994 |
3.508 3.500 |
2.058 2.010 |
0.064 0.010 |
| PTFE Composite0205 | 5.25 4.75 |
|||||||
| PTFE Composite0303 | 3 | 4.5 | 0.750 0.730 |
3.25 2.75 |
3.000 2.994 |
4.508 4.500 |
3.048 3.000 |
0.054 0.000 |
| PTFE Composite0305 | 5.25 4.75 |
|||||||
| PTFE Composite0306 | 6.25 5.75 |
|||||||
| PTFE Composite0403 | 4 | 5.5 | 3.25 2.75 |
4.000 3.992 |
5.508 5.500 |
4.048 4.000 |
0.056 0.000 |
|
| PTFE Composite0404 | 4.25 3.75 |
|||||||
| PTFE Composite0406 | 6.25 5.75 |
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| PTFE Composite0410 | 10.25 9.75 |
|||||||
| PTFE Composite0505 | 5 | 7 | 1.005 0.980 |
5.25 4.75 |
4.990 4.978 |
7.015 7.000 |
5.055 4.990 |
0.077 0.000 |
| PTFE Composite0508 | 8.25 7.75 |
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| PTFE Composite0510 | 10.25 9.75 |
|||||||
| PTFE Composite0604 | 6 | 8 | 4.25 3.75 |
5.990 5.978 |
8.015 8.000 |
6.055 5.990 |
||
| PTFE Composite0606 | 6.25 5.75 |
|||||||
| PTFE Composite0608 | 8.25 7.75 |
|||||||
| PTFE Composite0610 | 10.25 9.75 |
|||||||
| PTFE Composite0710 | 7 | 9 | 10.25 9.75 |
6.987 6.972 |
9.015 9.000 |
7.055 6.990 |
0.083 0.003 |
|
composite Bushing Manufacturer | PTFE & POM Series | Steel Backed
Please get in touch with una@viiplus.com to receive a professional and fast quotation
Why Choose Composite Bushings?
Composite bushings offer a compelling array of advantages over traditional bearing solutions, making them a preferred choice for modern engineering challenges:
- Maintenance-Free Operation: Especially the PTFE series, these bushings are ideal for inaccessible locations or applications where routine maintenance is difficult or costly. Their self-lubricating properties significantly reduce downtime and operational expenses.
- High Load Capacity: Thanks to the robust steel backing, composite bushings can withstand significantly higher loads compared to pure plastic bearings, bridging the gap between metallic and plastic solutions.
- Compact Design: The thin wall thickness of composite bushings allows for smaller housing dimensions, contributing to more compact and lightweight designs in machinery and equipment.
- Cost-Effective: In many applications, composite bushings provide a more economical alternative to expensive bronze bearings, offering comparable or superior performance with reduced maintenance needs.
- Chemical Resistance: Both PTFE and POM layers exhibit excellent resistance to a wide range of industrial fluids, chemicals, and gases, ensuring reliable performance in harsh chemical environments.
Industrial Applications Of composite
The versatility and robust performance of composite bushings make them indispensable across numerous industries:
- Automotive: Widely used in door hinges, shock absorbers, wiper systems, seat mechanisms, and pedal assemblies, contributing to smoother operation and extended vehicle life.
- Hydraulics: Essential components in gear pumps, cylinders, and vane pumps, where their low friction and high load capacity ensure efficient and reliable fluid power transmission.
- Agriculture & Construction: Critical for heavy-duty machinery such as tractors, excavators, and forklift trucks, particularly in pivot points, linkages, and boom mechanisms that operate in challenging, dirty environments.
- General Industry: Found in a broad spectrum of equipment, including textile machines, packaging machinery, fitness equipment, and material handling systems, where they enhance efficiency and reduce maintenance.
Specifications & Custom Solutions
Composite bushings are available in a variety of standard configurations to meet diverse industrial needs. These include:
- Standard Models: Metric & Imperial sizes are readily available, ensuring compatibility with global design standards.
- Primary Forms: Common forms include cylindrical bushes, flanged bushes (for axial location), thrust washers (for axial loads), and strips (for custom designs or sliding plates).
At BronzeOilless.com, we understand that standard solutions may not always fit unique requirements. Therefore, we offer custom dimensions and material combinations based on your drawings, ensuring a perfect fit and optimal performance for specialized applications.
