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DELTEX - torsionally flexible shaft coupling

The torsionally flexible DELTEX coupling transmits torque without the risk of breakdown and backlash-free. The crowned involute tooth of the sprocket allows compensation of radial and angular displacements of the two connected shafts. It consists of a thermoplastic polyurethane elastomer that is loaded exclusively under pressure, designed for high abrasion resistance and elasticity, has good damping characteristics, is resistant to oils, greases, many solvents, atmospheric effects and ozone, as well as having a good resistance to hydrolysis in tropical conditions.



DELTEX spiders

The hardness of the standard spider is 92° Shore A (yellow). Spiders with a hardness of 98° Shore A (red) can be used for higher torque values. For high torque values, a spider with 64° Shore D (green) is recommended; this is extremely hard and has only a slight damping effect. As deformation progresses, the crowned teeth of the spider absorb deformation energy at a disproportionally increasing rate. Consequently, the coupling action at low torque transmission rates is relatively soft, becoming harder as torque increases. The result is a progressive spring characteristic curve. A particular advantage of this progressive spring characteristic curve is the resonance behaviour of the DELTEX coupling.


  • Shaft coupling for power transmission with torsional vibration damping
  • Axial plug-in – easy assembly – maintenance-free
  • Operating temperature range from -40 °C to +100 °C, peak temperatures up to +120 °C
  • Compensates for axial/radial/angular shaft misalignments
  • Compact dimensions, low weight and low inertia
  • All-round precision finishing
  • Wide basic range of steel, stainless steel, aluminium and cast iron couplings

In this way, the progressive spring characteristic prevents, above all, any impermissible overloading of the coupling. The spring rigidity can also be influenced by selection of an appropriate Shore hardness. A higher Shore hardness shifts the natural frequency to a higher range, while a lower Shore hardness shifts it to lower range. If in doubt, we recommend that you calculate the system using the respective mass inertia moments of the driving and driven sides. 4 Standard DELTEX Wellenkupplung NBL spielfreie Ausführung

Hub A

  • Can be combined with hub B, D, C, E and F
  • For coupling sizes 14 - 100
  • Material: Steel, high-grade steel, GJL and Al

Hub B

  • Can be combined with hub A, D, C, E and F
  • For coupling sizes 14 - 100
  • Material: Steel, high-grade steel, GJL and Al

Flange (large) C

  • Can be combined with hub A, B and C
  • For coupling sizes 24 - 100
  • Material: Steel and GJL

Spacer D

  • Can be combined with hub A and B
  • For coupling sizes 19 - 90
  • Material: Steel

Flange (small) E

  • Can be combined with hub A, B, C and E
  • For coupling sizes 24 - 100
  • Material: GJL

Extension hub (2 parts) including screws F

  • For coupling sizes 24 - 100
  • Material: GJL

Standard spiders

NBL spiders


  • Torsionally flexible shaft coupling
  • Material: Polyurethane