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Multi-part design with screw-in flange, internally centered

The TSCHAN® TNM KG couplings are torsionally flexible, puncture proof claw couplings. They compensate for angular, radial and axial shaft misalignments within defined limits. The coupling transmits torque through elastic buffers loaded in compression. These buffers come in Perbunan (Pb), and are connected to each other to form an intermediate buffer ring. The buffer ring dampens shocks and torsional vibrations. It is resistant to oil and electrically conductive. One of the coupling halves consists of two parts which allows for the easy separation of the coupled machines. The direction of rotation can be checked after having retracted the claw ring. It is also possible to radially remove a coupling half. The buffer ring can be replaced without having to displace the machines. The coupling is suitable for use in both directions of rotation and any installation position.


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metric inch
CAD Identifier A TKNPb82 nmax d1kmax D1 d7 DPC7 C1 L L2 Gwub
    mm Nm 1/min mm mm mm mm mm mm mm kg
  WN1116-254 254 980 4000 75 168 13,5 228 87 142 52,5 14,6
  WN1119-290 290 1650 3500 85 194 13,5 265 97 159 60 22,1
  WN1121-334 334 2400 3000 95 214 13,5 310 107 175 66,5 30,1
  WN1124-390 390 3700 2750 100 240 14 360 117 192 75,5 41,9
  WN1126-470 470 5800 2500 115 265 18 420 137 220 88 62,7
Identifier A TKNPb82 nmax d1kmax D1 d7 DPC7 C1 L L2 Gwub
inch ft-lbs rpm inch inch inch inch inch inch inch lbs
WN1116-254 10.000 723 4000 6.614 0.531 8.976 3.425 5.591 2.067 32.19
WN1119-290 11.417 1217 3500 7.638 0.531 10.433 3.819 6.260 2.362 48.72
WN1121-334 13.150 1770 3000 8.425 0.531 12.205 4.213 6.890 2.618 66.36
WN1124-390 15.354 2729 2750 9.449 0.551 14.173 4.606 7.559 2.972 92.37
WN1126-470 18.504 4278 2500 10.433 0.709 16.535 5.394 8.661 3.465 138.23


Multi-part design, to change the intermediate ring without axial movement of the driven parts with flange, internally centred. Elastic intermediate ring in different hardnesses: standard Pb72, hard Pb82.

General features

  • Torsionally flexible, compensate for angular, radial and axial shaft misalignment
  • Intermediate rings loaded in compression
  • Elastomers available in various shore hardness degrees
  • Suitable for temperatures from –30°C to +100°C
  • The elastic ring can be replaced without having to move the coupled machines (multi-part models)
  • Bores up to max. 280 mm
  • Torques up to TKn = 41,000 Nm / TKmax = 97,500 Nm
  • Speeds up to nmax = 5,000 rpm


The rotationally resilient coupling of the TSCHAN® TNM series is flexible in all directions and therefore compensates for angular, parallel and axial shaft misalignments of the connected machines. Misalignments can be caused, for example, by inaccurate assembly, heat movements or settling phenomena.

Avoiding Torsional Vibration

By virtue of the rotational resilience of the coupling, dangerous torsional vibrations from the operational range of plant machinery can be transferred to rotational speed ranges in which no negative effects are to be expected. The elastic intermediate rings possess a high material damping capability which makes it possible for the couplings to keep the resonance enhancements within limits when passing through dangerous speed ranges, thereby protecting the coupled machines against damage. The couplings also mitigate torque shocks and cause a vibrating system that has been excited by an impact to come to rest very quickly due to the material damping qualities. The conduction of structure-borne noise is prevented.

Elastomer Materials

Synthetic rubbers are used as base material for the elastic elements of the TNM couplings. As a rule these are electrically conductive and therefore prevent undesirable static charges. For the elastic elements of the TSCHAN® TNM coupling series, there are two different material hardnesses available as standard.

  1. Perbunan (Pb 72) with nitrile rubber (NBR) as the basic material and a hardness of 72 Shore A.
  2. Perbunan (Pb 82) with nitrile rubber (NBR) as the basic material and a hardness of 82 Shore A.

The resilience of the individual elastomer materials is designated by their Shore hardness. From these values an indirect conclusion can be drawn with respect to the torques the coupling is able to transmit and its spring stiffness. For further details, please see the technical data sheet.

Environmental conditions

The employed elastomer materials operate reliably in ambient temperature ranges of –30° to +100°C. Please contact RINGFEDER POWER TRANSMISSION if higher ambient temperatures are involved. The influence of the temperature on the coupling size selection is explained in more detail in the below-mentioned design directives. It is only allowed to operate the coupling in normal industrial air. Aggressive media may attack the coupling components, bolts and elastic elements, and, therefore, present a danger to the operational safety of the coupling. The coupling can be certified in accordance with the European Directive 94/9/EC, also known as ATEX 95. Please contact RINGFEDER POWER TRANSMISSION regarding the declaration of conformity according to 94/9/EC and the effects of aggressive ambient media.

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