Spring Engaged Brakes

Spring Engaged Brakes

Flange Mounted Friction Brakes for Power Off Holding

Function: Holding, Failsafe (Non-Cycling Applications)
Drive Arrangement: Machine Frame or Bracket to Shaft


  • Spring pressure compresses drive and friction discs to produce a fixed amount of torque.
  • The brake releases when energized with sufficient air pressure (see table below).


  • The brake flange bolts to a machine frame or other fixture, the shaft inserts into the bore and is fixed with a customer supplied key.
  • Brake can also be mounted mid-shaft with the flange connected to a bracket.
  • Spring engaged brakes are designed for horizontal mounting. If vertical mounting is required, consult engineering.


  • Spring engaged brakes are designed for holding applications.
  • Maximum RPM varies by model. Please consult the detail sheets (below). Consult engineering┬áif the intended application exceeds the listed maximum RPM.

Design Features

  • Spring engaged brakes are made-to-order with any bore size up to the maximum shown for easy installation.
  • Drilled and slotted flange allows for variable installation arrangements.
  • Low coefficient friction lining versions are available for applications requiring slip or a narrower torque range. Contact engineering for details.
Product CodeTorqueBrake Release PressureMaximum Bore with Standard KeywayDetail SheetRequest 3D CAD Model
D2F3R-STH91 lb-in 60 PSI0.500 in (12 mm)View PDFRequest
D3F3R-STH222 lb-in 60-65 PSI0.875 in (21 mm)View PDFRequest
D4F3R-STH497 lb-in 60-65 PSI1.125 in (28 mm)View PDFRequest
D5F3R-STH985 lb-in 60-65 PSI1.438 in (38 mm)View PDFRequest
D6F3G-STH2,296 lb-in 60-65 PSI2.000 in (52 mm)View PDFRequest
D8F3K-STH4,326 lb-in 60-65 PSI2.375 in (66 mm)View PDFRequest
DAF3K-STH8,775 lb-in 60-65 PSI2.750 in (72 mm)View PDFRequest