PTFE plain bearings

PTFE bearings

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.

Materials

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.

Lubrication

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.

Cross-section of PTFE bearings

Cross-section PTFE bearings

Advantages

PTFE bearings

Main advantages of PTFE bearings include:

  • Self-lubricating
  • Maintenance-free
  • High load capacity
  • Low friction coefficient
  • Minimal bearing play
  • Operating temperature up to 250°C

PTFE bearings

Applications

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PTFE bearings are best suited to applications with high loads and requiring self-lubricating operation. Common applications are:

  • Elevators
  • Hydraulics
  • Textile machines
  • Butterfly valves
  • Consumer electronics

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Specification overview

PropertiesTU (Steel)TU-B (Bronze)TU-I (Stainless steel)
Max. load (Dyn/stat), N/mm2140 / 250140 / 140140 / 250
Max. sliding speed m/s2.52.52.5
Max. PV value N/mm2 x m/s1.81.81.8
Temperature range, oC-200 / +280-200 / +280-200 / +280
Shaft tolerancef7 - h8f7 - h8f7 - h8
Housing toleranceH7H7H7
Shaft roughnessRa < 0.4Ra < 0.4Ra < 0.4
Shaft hardnessHB > 200HB > 200HB > 200

Download brochure

Download plain bearing brochure

You will find everything about our range of plain bearings in THN’s plain bearing brochure. From an overview of the plain bearings, an overview of the specifications, to installation instructions and complete dimension tables.

Download the plain bearing brochure

Download plain bearing brochure

Customer service

THN Customer Service

Are you looking for plain bearings and you want direct contact with one of our plain bearing specialists? Give us a call, we’ll be happy to help.

Call our customer services on: +33 (0)3 72 39 51 51

THN Customer Service

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