Tension Control Brakes

Tension Control Brakes

SensiFlex® Patented Tension Control Technology

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


  • Friction brake engages with air pressure and is designed for continuous slip.
  • Brake is spring released when air is exhausted.
  • Torque is linear in response to air pressure applied.


  • Flange bolts to machine frame or other fixture, shaft inserts into bore and is fixed with set screws and customer supplied key.
  • Designed for horizontal or vertical mounting.


  • For applications requiring a brake to provide tension on and/or stopping of an unwind shaft.
  • Cooling sleeve rotates at speed of unwind shaft.
  • 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 Code Torque @ 80 PSIHeat Dissipation @ 1800 RPMMaximum Bore with Standard KeywayDetail SheetRequest 3D CAD Model
38BK-ULOW 81 lb-in0.14 tHP0.875 in (21 mm) View PDFRequest
38BK148 lb-in0.14 tHP0.875 in (21 mm)View PDFRequest
58BK-ULOW 225 lb-in0.47 tHP1.375 in (38 mm)View PDFRequest
58BK409 lb-in0.47 tHP1.375 in (38 mm)View PDFRequest
78BK-ULOW 547 lb-in0.81 tHP1.875 in (50 mm)View PDFRequest
78BK994 lb-in0.81 tHP1.875 in (50 mm)View PDFRequest
98BK-ULOW 1,068 lb-in1.13 tHP2.125 in (57 mm)View PDFRequest
98BK1,941 lb-in1.13 tHP2.125 in (57 mm) View PDFRequest