Pilot Input Clutch-Brakes To Stop and Start the Shaft

Pilot Input Clutch-Brakes To Stop and Start the Shaft

Combination Air Applied Clutch and Spring Applied Brake

Function: Starting and Stopping / Holding The Shaft
Drive Arrangement: Pilot Mounted Component to Shaft


  • Applying air pressure releases the spring applied friction brake and engages the friction clutch.
  • Torque of the clutch is linear in response to air pressure applied above the brake release pressure.
  • Brake torque is fixed by spring pressure.


  • Through (Mid) Shaft or End of Shaft.
  • Clutch Brake slides on shaft and is fixed with set screws and a customer supplied key.
  • Anti-rotation arm required to react, brake, and prevent rotation of the air housing.
  • Clutch Brakes are designed for horizontal mounting. If vertical mounting is required, consult engineering for options.


  • Stop/Start, Cycling, Indexing with input from a constantly driven sprocket or pulley.
  • For applications with small brake torque requirement.
  • Maximum RPM varies by model and is listed on the PDF detail sheet (see table below). Consult engineering if the intended application exceeds the listed maximum RPM.

Design Features

  • Clutch and brake combined in one unit for simplified mounting and control.
  • Clutch brakes are bored to suit up to the maximum shown (US & Metric) for easy installation.
  • Machined pilot for easy mounting of pulley or sprocket.
Product No. Clutch Torque @ 80 PSISpring Set Brake TorqueBrake Release PressureMaximum Bore with Standard Keyway (Inches / Millimeters)Detail SheetRequest 3D CAD Model
X3A2H-STH 275 lb-in19 lb-in15-20 PSI0.625 in (16 mm)View PDFRequest
X4A2H-STH 712 lb-in62 lb-in20-25 PSI 1.250 in (31 mm)View PDFRequest
X5A2H-STH 1,482 lb-in163 lb-in20-25 PSI 1.438 in (38 mm) View PDFRequest
X6A2G-STH 2,706 lb-in256 lb-in20-25 PSI 2.000 in (52 mm) View PDFRequest