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Wrapped composite sliding bearing steel/graphite bronze, incorporated solid lubricant

Technical details GAP-MET® / S

  • Wrapped composite sliding bearing
  • Steel / graphite bronze
  • DIN 1494 / ISO 3547
  • maintenance-free
  • Available with graphite film
  • Grooves or holes are available in different constructions

GAP-MET®/S: Why a sliding bearing can work maintenance-free

With GAP-MET®/S we supply you with a wrapped compound sliding bearing made from steel with homogeneously embedded graphite components. These ensure that our sliding bearing can perform their duties completely maintenance-free. In addition, GAP-MET®/S also operates without problems in a contaminated environment and does not absorb any external moisture. The product is used particularly in hydropower plants and plastic machinery.

GAP-MET®/S is composed of steel as the carrier material with a copper-tin alloy sliding surface with graphite components, thanks to which the sliding bearing operates maintenance-free. Under certain conditions, bronze (GAP-MET®/B) or stainless steel (Niro – GAP-MET®/N) are used as carrier material. It is also possible to integrate a graphite run-in film to exclude strong friction in the starting phase. Overall, GAP-MET®/S is distinguished by its high resistance to load and strength, as well as its good chemical resistance. The most important product characteristics are as follows:

  • specific load capacity static ≤260 Newtons/mm2
  • specific load capacity dynamic ≤80 Newtons/mm2
  • sliding speed <0.5 m/s
  • friction value 0.1 µ to 0.2 µ
  • temperature load -150ºC to +280ºC.

GAP-MET® / S operates optimally with a hardened steel shaft which should have a degree of hardness of more than 180 HB and a roughness depth of at most 4 Rz. The housing bore should be H7 and the shaft tolerance d7 or e7.

Everything runs smoothly with graphite – and the sliding bearing is maintenance-free

The graphite inclusions in the bronze sliding layer ensure that the sliding bearing can operate fully maintenance-free. Because the crystal planes in the carbon bonding slide past each other well, this allows so-called solid and dry lubrications, in which the continuous graphite abrasion supports the self-lubrication of the sliding bearing. The optional graphite run-in film also guarantees that everything runs smoothly from the first rotation. We can also provide a range of grooves and drillings to suit the application where you want to use the sliding bearing. These not only absorb particles of dirt, but also provide the optimal distribution of the graphite abrasion in the sliding bearing. Do you have any questions on the operation or optimum use of GAP-MET®/S? Then call us on 089 – 4614951-0 or use the contact form. Even if the sliding bearing works maintenance-free: We look forward to your feedback!


  • High load capacity and stability , suitable for all slow movements and contaminated environments, no moisture absorption, good chemical resistance.


  • Support material Steel*
  • Sliding layer CuSn **– Shake down layer: Graphite film
  • Stainless steel support material: GAP-MET®/N Bronze support material: GAP-MET®/B

Material properties

  • Specific load capacity static ≤ 260 [N/mm2]
  • Specific load capacity dynamic ≤ 80 [N/mm2]
  • Sliding speed < 0.5 [m/s]
  • Friction value ** 0.1 [µ] to 0.2 [µ] dry
  • Temperature strain -150 [°C] to +280 [°C]
  • Max. PV-value 1.0 [N/mm² x m/s] dry

Tolerance details

  • Housing Ø H7
  • Bushing inner-Ø after mounting H8/H9
  • Shaft tolerance d7/e7

Shaft material

  • Steel hardened > 180 HB, surface roughness Rz ≤ 4

Mounting advise

  • Housing: Mounting bevel min. 1.5mm x 15-45°
  • Shaft: Mounting bevel 5 mm x 15°, edges rounded
  • The application of an adequate force fitting mandrel is advisable. Grease lubrication of the outer surface may be necessary when mounting.


  • GAP-MET®/S is a maintenance-free composite sliding bearing. Oil or grease lubrication is possible.

Range of application

  • Hydropower plants, general power plants, plastics machines


* For special requirements, e.g. a higher temperature range, we can offer different types of materials.

** The above stated material properties are valid for optimal operating conditions. Through changes of the application conditions, eg. higher sliding speed or strain, these values are subject to change.