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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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 Retractable Pistons | 1/4 | Air | |
| 4251-0074 | P491DLR | Double Acting, Fixed Mount. Use Fixed or Floating Disc | Dual 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 Retractable Pistons | 1/2 | Air | |
| 4251-0038 | P491DJ | Double Acting, Fixed Mount. Use Fixed or Floating Disc | Dual Non-Retractable Pistons | 1/4 | Air | |
| 4251-0076 | P491DJR | Double Acting, Fixed Mount. Use Fixed or Floating Disc | Dual 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 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 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 Retractable Pistons | 1-1/8 | Air |