Pilot Input Tension Control Clutches

Pilot Input Tension Control Clutches

SensiFlex® Patented Tension Control Technology

Engineered to deliver precision control of web tension without sticking, pulsing or cogging.


  • Friction clutch engages with air pressure and is designed for continous slip.
  • Clutch is spring released when air is exhausted.
  • Torque is linear in response to air pressure applied.


  • Through/Mid Shaft or End of Shaft.
  • Anti-rotation arm required to prevent rotation of the air housing.
  • Designed for horizontal or vertical mounting.
  • Bored to suit up to the maximum shown (US & Metric) for easy installation.


  • For tension control applications requiring the clutch to drive the shaft when engaged.
  • Cooling sleeve rotates with the pilot mounted sprocket, pulley, or coupling at the speed of the drive input.
  • If clutch will drive a pilot mounted sprocket, pulley, or coupling when engaged, or if the clutch will be used as a brake, see the SensiFlex® Shaft Input (SI) model.
  • Maximum RPM varies by model. Please consult the detail sheets (below). Consult engineering if the intended application exceeds the listed maximum RPM.

Design Features

  • Exclusive, patented actuator engages smoothly at low pressures and provides maximum sensitivity to slight changes in air pressure for infinite control of torque output.
  • Radial cooling holes pull cooler, ambient air through the clutch or brake to dissipate the heat generated by constant slip, preventing friction lining fade and premature wear.
Product CodeTorque @ 80 PSIHeat Dissipation @ 1800 RPMMaximum Bore with Standard KeywayDetail Sheet Request 3D CAD Model
38PI-ULOW 36 in-lb0.19 tHP0.625 in (16 mm) View PDFRequest
38PI 66 in-lb0.19 tHP 0.625 in (16 mm)View PDFRequest
58PI-ULOW 122 in-lb0.57 tHP1.000 in (24 mm)View PDFRequest
58PI 222 in-lb0.57 tHP1.000 in (24 mm) View PDFRequest
78PI-ULOW 326 in-lb1.02 tHP1.375 in (38 mm)View PDFRequest
78PI 593 in-lb1.02 tHP1.375 in (38 mm) View PDFRequest
98PI-ULOW 668 in-lb1.36 tHP1.875 in (50 mm)View PDFRequest
98PI1,214 in-lb1.36 tHP1.875 in (50 mm)View PDFRequest
118PI-ULOW 1,296 in-lb1.90 tHP2.250 in (57 mm) View PDFRequest
118PI2,356 in-lb1.90 tHP2.250 in (57mm)View PDFRequest