The Rowland Company
The Rowland Company
4900 North 20th St.
Philadelphia, PA 19144
Toll Free: (800) 925-8824
Phone: (215) 455-4900
Fax: (215) 455-8888
Email: rowland@rowland2.com
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Section B
Form CB-402
Unit of Measure

Specifications

Size

 N/A 20CB500
Torque Rating (75 psi/5.5 bar)1 N/A 53600 lb·in6060 Nm
Maximum Speed2 N/A 1300 rpm

Centrifugal Loss Constant Cs

 N/A 1.73 E-06 bar/rpm2 25 E-06 psi/rpm2

Inertia

 N/A 90 lb·ft²3.78 kg·m²

Weight

 N/A 88 lb40 kg

Friction Area

 N/A 288 in²1858 cm²

New Friction Lining Thickness

 N/A 0.26 in7 mm

Worn Friction Lining Thickness

 N/A 0.06 in2 mm
Air Tube Cavity3 N/A 170 in³2.79 dm³

Minimum Drum Diameter

 N/A 19.87 in505 mm

Dimension D2

 N/A 6.63 in168 mm

Dimension D24

 N/A 2.50 in64 mm

Dimension D25

 N/A 0.19 in5 mm
Dimension G4 N/A 27.500 in698.5 mm

Dimension G1

 N/A 24.75 in629 mm

Dimension H2

 N/A 26.375 in669.9 mm

Dimension H6

 N/A 20.19 in513 mm

Dimension H7

 N/A 26.38 in670 mm

Number of Mounting Holes

 N/A 12

Bolt Hole Size L

 N/A 0.500 in13 mm

Dimension O3

 N/A 0.38 in10 mm

Air Inlet Thread

 N/A 3/8-18

Angle Q

 N/A 15.000 º

Dimension V

 N/A 0.81 in21 mm

Number of Friction Shoes

 N/A 12

Friction Shoe Width (W)

 N/A 5.00 in127 mm

Note

N/A Refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified.

  • 1 Dynamic torque shown, static torque approximately 25% greater. Torque in each application is dependent upon air pressure and speed.
  • 2 Maximum rpm is dependent upon operating conditions and varies for each application. Consult factory for applications exceeding these speeds.
  • 3 Drum contact with worn shoes.
  • 4 Tolerance for sizes:
    3 thru 5
    +0.000/-0.003 in (+0.00/-0.08 mm)
    6 and larger
    +0.000/-0.005 in (+0.00/-0.13 mm)