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Bimetal tubes, Tokat 50

TOKAT - Bronze (Cu Pb 20 Sn) and steel (E235) form a single bimetallic part that combines the advantageous mechanical properties of the two materials: friction and mechanical strength. As a result, Swiss-made bimetallic tubes solve your friction and sliding problems in linear and rotary guides.

Bimetallic tubes are the ideal complement to hardened/ground shafts. They are suitable as plain bearings and can be used in combination with ground shafts for both longitudinal and rotary movements.

Avantages of bimetal tubes

Bimetal pipes were developed to meet extreme conditions:

  • High mechanical loads > 70 N/mm²
  • High speeds up to 30 m/sec
  • Wide temperature range -70° C to +250°C

This is made possible by the manufacturing process from which a bronze/steel interface is created by casting, characterised by an intermetallic diffusion zone of 3 to 5 μ without the appearance of a brittle phase. Bronze and steel form a single bimetallic part that combines the advantageous mechanical properties of the two materials: friction and mechanical strength.

The interface does not contain any anchoring elements, metallisations or underlays that weaken the intermetallic bond. The mechanical strength of the interface controlled by ultrasound is higher than that of the bronze itself: There is no risk of detachment, even under extreme loads. The coefficients of expansion of the two materials are similar.

After casting and cooling, the end faces of the tube and the inner diameter are machined to ensure a surface finish and tolerances that allow easy finishing for finishing. The outside diameter is shot peened.

Additional components can be added by welding without changing the bronze layer of the bimetal tube.

By varying the dimensions of the tubes, within the limits of the manufacturing programme, bimetallic tubes can be produced in an infinite range of diameters and wall thicknesses. The standard range available from stock and the wide range of special dimensions that can be produced on request allow savings in materials and machining.

The bronze used favours the formation of a solid lubricant under certain conditions (start-up in mixed operation or breaking up of the oil film).

Application of bimetal tubes

The application of bimetallic tubes successfully solves friction and sliding problems related to bearings in various industries and is used in the following areas, among others: 

    • presses
    • rolling mills
    • diesel engines
    • static or dynamic transmission devices
    • railway construction
    • road construction machinery

 Specifications and dimensions


  • ØD: -1/+0 mm
  • Ød: ± 0.6 mm
  • Hardness: HB 60 - 75 daN/mm2
  • The roughness of the blasted outer Ø: 12.5 µm Ra max.
  • The roughness of the machined surfaces and the inner Ø: 3.2 µm Ra.

Advice for use

The outer Ø should be peeled by 2 mm to obtain a clean functional surface.

For optimal use of the bimetal tube, we recommend a finished thickness of 1 mm +/- 0.2 bronze.

Size range

Bimetallic tubes are produced in a wide range of dimensions. In our range we offer the following selection of dimensions:

  • Outer diameter: from 32.00 to 170.00 mm
  • Inner diameter: up to 133.00 mm
  • Length: 500 mm +/- 2 mm 


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