High load capacity and maintenance-free
PTFE bearings are ideal for applications with high loads and moderate speeds. The distinctive feature of these plain bearings is that they are maintenance-free. PTFE bearings are produced according to ISO 3547.
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Advantages of PTFE bearings
Main advantages of PTFE bearings include:
- High load capacity
- Low friction coefficient
- Minimal bearing play
- Operating temperature up to 250°C
Applications of PTFE bearings
PTFE bearings are best suited to applications with high loads and requiring self-lubricating operation. Common applications are:
- Textile machines
- Butterfly valves
- Consumer electronics
PTFE bearings are made with a steel or bronze backing as standard. A stainless steel backing is available on request. A sintered bronze layer is applied to the backing. This layer is provided with a PTFE-based self-lubricating lead-free sliding surface. The bronze intermediate layer ensures efficient heat dissipation and makes for a strong joint between the backing and the sliding surface. The steel backing has a layer of tin to prevent corrosion.
During a short run-in period, part of the run-in layer, the PTFE mixture, is transferred to the counter-material. During the run-in period of the PTFE bearing, the bearing surface usually takes on a gray/green color. The characteristic low friction and wear values are obtained at the end of the run-in period. Adding oil or other non-corrosive fluids can enhance the bearing's performance.
Specification overview of PTFE bearings
|Properties||TU (Steel)||TU-B (Bronze)||TU-I (Stainless steel)|
|Max. load (Dyn/stat), N/mm2||140 / 250||140 / 140||140 / 250|
|Max. sliding speed m/s||2.5||2.5||2.5|
|Max. PV value N/mm2 x m/s||1.8||1.8||1.8|
|Temperature range, oC||-200 / +280||-200 / +280||-200 / +280|
|Shaft tolerance||f7 - h8||f7 - h8||f7 - h8|
|Shaft roughness||Ra < 0.4||Ra < 0.4||Ra < 0.4|
|Shaft hardness||HB > 200||HB > 200||HB > 200|
Product finder plain bearings
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