Air Engaged Clutch Mechanisms With Couplings

Connect Two Supported Shafts with No Angular Misalignment and/or Parallel Offset

Function: Connect, Disconnect
Drive Arrangement: Shaft to Shaft, No Angular Misalignment and/or Parallel Offset


  • Friction clutch coupling engages with air pressure, spring released when air is exhausted
  • Torque is linear in response to air pressure applied.


  • Set screws and customer supplied key connect the clutch mechanism to one shaft and the coupling hub to a second, fully supported shaft.
  • Shafts must be accurately aligned to prevent premature failure.
  • Anti-rotation arm required to prevent rotation of the air housing.
  • Clutch couplings are designed for horizontal mounting. If vertical mounting is required, consult engineering for options.
  • Note: Clutch coupling mechanism DOES NOT support coupling half.


  • Clutch couplings connect/disconnect two fully supported shafts.
  • Maximum RPM varies by model. Please consult the detail sheets (below). Consult engineering if the intended application exceeds the listed maximum RPM.

Design Features

  • Both clutch mechanism and coupling half bored to suit up to the maximum shown (US & Metric) to accept differing shaft sizes.
  • Low coefficient friction lining versions are available for applications requiring slip or a narrower torque range. Contact engineering for details.
Product Code Torque @ 80 PSIMaximum Bore with Standard KeywayDetail Sheet Request 3D CAD Model
M2G2R-STH 190 lb-in0.500 in (12 mm)View PDF Request
M3G2R-STH 555 lb-in1.000 in (24 mm) View PDF Request
M4G2R-STH 1,317 lb-in1.250 in (31 mm) View PDF Request
M5G2R-STH 2,587 lb-in1.438 in (38 mm) View PDF Request
M5G2K-STH3,320 lb-in1.563 in (40 mm)View PDF Request
M6G2G-STH 5,397 lb-in2.000 in (52 mm) View PDF Request
M6G2K-STH 5,397 lb-in 2.000 in (52 mm)View PDF Request
M8G2K-STH9,212 lb-in2.500 in (66 mm)View PDF Request
MAG2K-STH 14,755 lb-in2.750 in (72 mm) View PDF Request
MBG2K-STH 21,204 lb-in3.500 in (95 mm) View PDF Request