Multiple Disc Mechanical Clutches (MMS/MMD)

Multiple Disc Clutches

Carlyle Johnson's Mechanical Multiple Disc mechanical clutches provide 3 to 6 times the torque produced by a single disc mechanical / friction clutch of the same package size, making them the ideal solution for high torque, limited space requirements.

Separator springs are used between each pair of inner discs on these mechanical clutches, providing the advantage of truly floating discs. This ensures that there is negligible drag, no abrasion, and consequently no heat generated when the clutch is in neutral. A locking plate on the disc end of each unit (two on double types) locks all discs against compression by the lever system.

As with all Carlyle Johnson products, our multiple disc mechanical clutches can be customized to meet your applications. Our engineering department can also custom-design and produce a mechanical or friction clutch to fit your exact requirements.

Features of MMS/MMS Multiple Disc Clutch Units

The MMS/MMD unit's clutch disc features a bronze or steel friction clutch surface for added life, superior consistency for indexing and for excellent torque transmission. Shipped fully-assembled CJM multiple disc mechanical clutches arrive ready to be slipped onto a shaft.

When needed, manual adjustment to the clutch is made by temporarily loosening the lock screw on the split type adjusting ring, then turning the ring to give the desired shifting pressure. Only a hex key wrench is required for this adjustment.

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Overview - MMS/MMD
Multiple Disc Clutches


  • Highest torque in the smallest space
  • High performance and long-life
  • Simplicity of design, greater adaptability
  • "Floating Disc Packs" - reduce drag, abrasion and heat build-up in neutral as well as provide consistent release
  • Easy on-line manual adjustment allows for fine-tuning of the device
  • Shipped assembled and ready to install


  • Torque range 10 lb. ft. - 2400 lb. ft.
  • 1 HP to 150 HP capacity
  • Positive engagement / disengagement possible at any speed
  • All units run in oil or dry applications


  • Available in single or double type
  • Custom designs and alterations available

Additional Information


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