H491S | H491D

Single or Double Acting Caliper Disc Brakes

  • Dynamic Torque (inch/lb) 352.5 lbf per 100 psi x Braking Radius
  • 9.14 sq. in. Total Friction Pad Area
  • > 12-inch Disc Diameter Range
  • 1500 PSI (103 Bar) Maximum Pressure
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Quick Facts - Dynamic Torque (inch/lb) = Tangential Brake Force (lbf) x Braking Radius (in.) | Braking Radius = Disc Radius - 1.31 in.

Model Tangential Brake Force lbf. (N) / 100 PSI Clamping Force, lbs. (N) / 100 PSI Disc Diameter Range, in. Bore Diameter, in. Piston Area, in. sq. Total Friction Pad Area, in. sq. Maximum Pressure, PSI (Bar)
H491S | H491D 352.5 (1572) 491 (2184) > 12 2.5 4.91 9.14 1500 (103)

H491S (Single Acting) Series

Product # Model # Description Additional Info Disc Thick. (in.) Fluid Type  
4251-0017 H491SBF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/4 Hydraulic Oil
4251-0018 H491SBFG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/4 Dot 3 Brake Fluid
4251-0019 H491SEF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/2 Hydraulic Oil
4251-0020 H491SEFG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/2 Dot 3 Brake Fluid
4251-0021 H491STF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 3/4 Hydraulic Oil
4251-0022 H491STFG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 3/4 Dot 3 Brake Fluid
4251-0023 H491SOF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1.0 Hydraulic Oil
4251-0024 H491SOFG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1.0 Dot 3 Brake Fluid
4251-0025 H491SQF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1-1/8 Hydraulic Oil
4251-0026 H491SQFG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1-1/8 Dot 3 Brake Fluid
4251-0033 H491SE Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston, Float Plates Not Included 1/2 Hydraulic Oil
4251-0034 H491SEG Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston, Float Plates Not Included 1/2 Dot 3 Brake Fluid
4251-0080 H491SBRF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 1/4 Hydraulic Oil
4251-0081 H491SLRF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 3/8 Hydraulic Oil
4251-0082 H491SERF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 1/2 Hydraulic Oil
4251-0083 H491SJRF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 5/8 Hydraulic Oil
4251-0084 H491STRF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 3/4 Hydraulic Oil
4251-0085 H491SORF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 1.0 Hydraulic Oil
4251-0086 H491SQRF Single Acting, Floating Mount. Use Fixed Disc Single Retractable Piston 1-1/8 Hydraulic Oil

H491D (Double Acting) Series

Product # Model # Description Additional Info Disc Thick. (in.) Fluid Type  
4251-0000 H491D Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons Custom Hydraulic Oil
4251-0001 H491DB Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1/4 Hydraulic Oil
4251-0002 H491DBG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1/4 Dot 3 Brake Fluid
4251-0003 H491DE Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1/2 Hydraulic Oil
4251-0004 H491DEG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1/2 Dot 3 Brake Fluid
4251-0005 H491DT Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 3/4 Hydraulic Oil
4251-0006 H491DTG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 3/4 Dot 3 Brake Fluid
4251-0007 H491DO Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1.0 Hydraulic Oil
4251-0008 H491DOG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1.0 Dot 3 Brake Fluid
4251-0009 H491DQ Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1-1/8 Hydraulic Oil
4251-0010 H491DQG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 1-1/8 Dot 3 Brake Fluid
4251-0035 H491DL Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 3/8 Hydraulic Oil
4251-0036 H491DLG Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons 3/8 Dot 3 Brake Fluid
4251-0060 H491DBR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 1/4 Hydraulic Oil
4251-0061 H491DLR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 3/8 Hydraulic Oil
4251-0062 H491DER Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 1/2 Hydraulic Oil
4251-0063 H491DTR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 3/4 Hydraulic Oil
4251-0064 H491DOR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 1.0 Hydraulic Oil
4251-0065 H491DQR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 1-1/8 Hydraulic Oil
4251-0066 H491DJR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Retractable Pistons 5/8 Hydraulic Oil

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