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Double engagement design
Movable universal hub
Sizes: 3 - 10


CAD Size D1 D2 E Lmax L L1 l1 l2 S D4
    mm mm mm mm mm mm mm mm mm mm
  3 84 50.9 6.7 139.7 109.2 83 35.5 67 30.5 50
  4 95 60.4 9 141 117 90.5 41 67 24 60
  5 120 82.6 9 250.9 179.5 142.5 48.5 122 71.4 82
  6 140 100 10.2 253.5 186.2 143.5 51 125 67.3 100
  8 168 121 10.2 297.2 216.2 166.5 61 145 81 120
  10 190 143 11 342 263 169.5 102 150 79 140

General features

  • Torsionally rigid gear coupling made of high-quality steel
  • Compensates for angular,radial and axial shaft offset
  • Suitable for use in temperatures up to +130°C if special seals are used
  • Available with split sleeve (ZEA / ZEB - ZEA model range also available in ZEB design) and single-piece sleeve (ZEH)
  • The elastic ring can be replaced without having to move the coupled machines (multi-part models)
  • Bores up to 320 mm
  • Torques up to TKn = 290,000 Nm / TKmax = 580,000 Nm
  • Speeds up to nmax = 5,000 rpm

General description

The POSIFLEX® coupling is a torsionally rigid twin cardanic gear coupling.


The coupling housings have a straight internal toothing whilst the hubs have an external toothing with a chased variable radius. As a result, the hubs can move spatially within the housing and thus compensate angular, radial and axial shaft misalignment of the adjoined shaft ends within specified tolerances. Depending on coupling type and size, the standard toothing permits an angular misalignment of up to 0.75 degrees per toothing-plane and an axial movement of several millimetres. The max. possible radial shaft displacement is dependent on the distance between the two toothing planes. Other toothing geometries can be used for further specific applications.


High-grade tooth profiles and grease with ultra high-pressure additives guarantee low-restoring forces and a long serviceable life. The material used is forged steel with an apparent yielding point of at least 350 N/mm2. Special materials can be used for further specific applications. Sealing is carried out using O-rings and lip-seals of buna N. The housings are centred and held together by fit-bolts and self-locking nuts.


The use of special seals permits the temperature limit to be raised to 130 °C.


At peripheral speeds upwards of 30 m/s it is advisable to dynamically balance the coupling.

Special applications

If greater misalignements are anticipated at higher speeds and torques, an examination is necessary, performed with the assistance of a special computing programme. This is independent of the determined size. The value TKmax may not be exceeded in any state of operation (start-up, electrical short circuit, blocking, etc.).

Tolerances and standards

The bore tolerance is ISO H7, if not differently ordered. The bore diameters listed refer to keyways to DIN 6885/1.

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