P491S | P491D

Single and 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 Disc Diameter Range, in.
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Model P491SEF

Quick Facts - Dynamic Torque (inch/lb) = Tangential Braking Force (lbf) x Braking Radius (in.) | Braking Radius = Disc Radius - 1.31 in.

Model Tangential Braking 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)
P491 352.5 (1572) 491 (2184) > 12 2.5 4.91 9.14 1500 (103)

P491S (Single Acting) Series

Product # Model Description Additional Info Disc Thick. (in.) Fluid Type
4251-0027 P491SBF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/4 Air
4251-0032 P491SLF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 3/8 Air
4251-0028 P491SEF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1/2 Air
4251-0029 P491STF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 3/4 Air
4251-0030 P491SOF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1.0 Air
4251-0031 P491SQF Single Acting, Floating Mount. Use Fixed Disc Single Non-Retractable Piston 1-1/8 Air

P491D (Double Acting) Series

Product # Model Description Additional Info Disc Thick (in.) Fluid Type
4251-0012 P491DB Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 1/4 Air
4251-0073 P491DBR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 1/4 Air
4251-0074 P491DLR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 3/8 Air
4251-0013 P491DE Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 1/2 Air
4251-0075 P491DER Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 1/2 Air
4251-0038 P491DJ Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 5/8 Air
4251-0076 P491DJR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 5/8 Air
4251-0014 P491DT Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 3/4 Air
4251-0077 P491DTR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 3/4 Air
4251-0015 P491DO Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 1.0 Air
4251-0070 P491DOR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 1.0 Air
4251-0016 P491DQ Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Non-Retractable Pistons` 1-1/8 Air
4251-0078 P491DQR Double Acting, Fixed Mount. Use Fixed or Floating Disc Dual Spring Retractable Pistons` 1-1/8 Air