M Series API Couplings | John Crane Power Transmission Couplings
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M Series

Diaphragm Membrane Coupling with Stainless Steel Discs in Factory-assembled Packs

M Series coupling range is particularly suited for electric motor and turbine drives in the oil and gas industry. Torque is normally transmitted through two sets of pre-assembled membrane units, separated by a spacer element. The coupling provides a good level of angular, lateral and axial misalignment, while maintaining a high level of balance integrity. In the unlikely event of membrane failure, due to a torque overload, the coupling will disconnect the drive, thus protecting the associated shafts. Standard options for spark resistance are available.

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  • California Residents: PROPOSITION 65 WARNING
  • Easy-to-fit cartridge and membrane units.
  • Meets ATEX 95, API 610, and can be supplied to meet API 671.
  • Intrinsic balance meets AGMA class 9.
  • High misalignment capability.
  • Stainless steel flexible membranes for maximum life.
  • Excellent power-to-weight ratio.
  • Cartridge membrane design reduces stock inventory.
  • The replaceable membrane units can be fitted to any length spacer to maximize the use of inventory held.
  • Low imposed forces on machinery leading to a reduced machinery vibration and maximized bearing life.
  • A bearing is fitted between the guard rings; in the very unlikely event of membrane failure, the spacer will freely rotate, giving no flow indication on the pump permitting the operators to shut down the machinery safely.
  • Anti-fly pretention of the spacer in the unlikely event of membrane failure.
  • Standard API puller holds incorporated into hubs.


Arbre de pompe maximum

De 12 po/300 mm

Couple maximum

95 500 Nm (845 000 lbf/po)

Limites de vitesse

24 000 tr/min

Limites de température

5 °F à 300 °F/-15 °C à 150 °C

Applications recommandées

  • Pompes de traitement
  • Moteurs électriques
  • Réducteurs
  • Turbines à vapeur
  • Turbines à gaz
  • Compresseurs centrifuges
  • Autres compresseurs
  • Autres équipements rotatifs
  • Générateurs
Fonctionne avec
Type 48HP Type 48HP
Type 48LP Type 48LP
Type 48MP Type 48MP
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