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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