Spring Set Brakes Operation Spring set friction brake is engaged by spring pressure at a fixed torque and releases with the application of designated air pressure Mounting Spring set brake flange bolts to machine frame or other fixture, shaft inserts into bore and is fixed with a customer supplied key Can also be mounted mid-shaft Spring set brakes are designed for horizontal mounting. If vertical mounting is required, consult engineering for options Applications Spring set brakes are designed for Stopping and Holding applications Maximum RPM varies by model. Please consult the detail sheets (below). Consult engineering if the intended application exceeds the listed maximum RPM. Design Features Spring set brakes are bored to suit up to the maximum shown (US & Metric) for easy installation Drilled & slotted flange for variable installation arrangements Available with either high or low* coefficient friction linings for same price

Spring Set Brake Repair Kits & Parts Click here or view PDF detail sheets below for more information.

Product No. Friction Lining Coefficient Torque (Lb-In) Release Pressure (PSI) Maximum Bore with Standard Keyway (Inches / Millimeters) Length (Inches) Outside Diameter (Inches) Mounting Bolt Circle (Inches) Detail Sheet Request 3D CAD Model D3F3R-STH High 222 60-65 0.875 / 21 2.81 4.75 4.375 D3F3R-STL Low* 148 60-65 0.875 / 21 2.81 4.75 4.375 D4F3R-STH High 497 60-65 1.125 / 28 3.33 6.00 5.562 D4F3R-STL Low* 331 60-65 1.125 / 28 3.33 6.00 5.562 D5F3R-STH High 985 60-65 1.438 / 38 3.87 7.44 6.844 D5F3R-STL Low* 657 60-65 1.438 / 38 3.87 7.44 6.844 D6F3G-STH High 2296 60-65 2.000 / 52 5.27 9.53 8.906 D6F3G-STL Low* 1531 60-65 2.000 / 52 5.27 9.53 8.906 D8F3K-STH High 4326 60-65 2.375 / 66 6.50 11.75 10.875 D8F3K-STL Low* 2884 60-65 2.375 / 66 6.50 11.75 10.875 DAF3K-STH High 8775 60-65 2.750 / 72 6.94 14.84 13.750 DAF3K-STL Low* 5850 60-65 2.750 / 72 6.94 14.84 13.750

*Low coefficient lining models are offered for applications where a small amount of slip is required or a narrower torque range is necessary. For continuous slip or tension control applications, a SensiFlex® brake should be used.

Mach III spring set brakes are solidly constructed to provide reliable power transmission. Spring set brake models can be adapted to accommodate customer needs. See our Custom Design Solutions page for more information. Mach III encourages contact with our engineering department before purchasing a spring set brake for use in a new or retrofit application.