FS38

Hydraulic Spring Applied Brake

Ideal for emergency stopping and holding of industrial machinery and off-highway vehicles.

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How do they work? Active minimum hydraulic pressure starting at 150 psi (depending on series type) releases the brake piston (pulls the brake piston away) from the brake disc rotor and stores that energy in a Belleville disc spring stack. Then, at loss of that hydraulic pressure the energy stored in the disc spring stack is emitted driving the brake piston and engaging the disc rotor for positive stopping.

Common features include: Cast aluminum construction | Hardcoated housings | Non-asbestos friction material | Replaceable friction pads | Buna-N seals | EPR seals for automotive brake fluid optional | Float mount | Belleville disc spring stack

Standard models for brake disc thicknesses of 5/32, 1/4, 3/8, 1/2, 5/8, 1 and 1-1/8 inches. Custom spacer sizes available including metric. Consult factory.

Engineering note: Spring applied brakes are intended for use as an emergency stop or static holding device. It is not suggested to use in continuous slip applications as torque capacity is directly related to friction pad wear.

Specifications FS38 Series:

  • Single Belleville Disc Spring Stack | 233 lb. Tangential Force at zero friction pad wear | 1719 in. lbs. F. braking torque using 16 inch disc diameter at maximum tangential force | 2.0 sq. in. total friction pad area | Unlimited disc diameter

FS38 Series

Product # Model Description Additional Info Disc Thick. (in.) Tangential Force
4004-0760 FS38SA Single Acting, Fixed Mount. Use Floating Disc Single Piston. Spring Applied 680 PSI Release 5/32 233 lbf, 1036 N
4004-0761 FS38SAF Single Acting, Floating Mount. Used Fixed Disc Single Piston. Spring Applied 680 PSI Release 5/32 233 lbf, 1036 N
4004-0762 FS38B Single Acting, Fixed Mount. Use Floating Disc Single Piston. Spring Applied 680 PSI Release 1/4 233 lbf, 1036 N
4004-0763 FS38SBF Single Acting, Floating Mount. Used Fixed Disc Single Piston. Spring Applied 680 PSI Release 1/4 233 lbf, 1036 N
4004-0766 FS38SL Single Acting, Fixed Mount. Use Floating Disc Single Piston. Spring Applied 680 PSI Release 3/8 233 lbf, 1036 N
4004-0767 FS38SLF Single Acting, Floating Mount. Used Fixed Disc Single Piston. Spring Applied 680 PSI Release 3/8 233 lbf, 1036 N
4004-0764 FS38SE Single Acting, Fixed Mount. Use Floating Disc Single Piston. Spring Applied 680 PSI Release 1/2 233 lbf, 1036 N
4004-0765 FS38SEF Single Acting, Floating Mount. Used Fixed Disc Single Piston. Spring Applied 680 PSI Release 1/2 233 lbf, 1036 N