Air Engaged Flexible Clutch Couplings

Air Engaged Flexible Clutch Couplings

Connect Two Supported Shafts with Slight Angular Misalignment and/or Parallel Offset

Function: Connect, Disconnect
Drive Arrangement: Shaft to Shaft, Slight 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.
  • 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 flexible coupling half.


  • Flexible 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

  • Elastomeric element compensates for up to 3 degrees of angular misalignment and up to 0.040 parallel offset between shafts.
  • Both clutch mechanism and coupling 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 CodeTorque @ 80 PSIMaximum Bore with Standard KeywayDetail SheetRequest 3D CAD Model
C2H2R-STH190 lb-in0.500 in (12 mm)View PDFRequest
C3H2R-STH555 lb-in1.000 in (24 mm)View PDFRequest
C4H2R-STH1,317 lb-in1.250 in (31 mm)View PDFRequest
C5H2R-STH2,587 lb-in1.438 in (38 mm)View PDFRequest
C5H2K-STH3,320 lb-in1.438 in (38 mm)View PDFRequest
C6H2G-STH5,397 lb-in2.000 in (52 mm)View PDFRequest
C6H2K-STH5,397 lb-in2.000 in (52 mm)View PDFRequest