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 28CB525
Torque Rating (75 psi/5.5 bar)1 N/A 106000 lb·in12000 Nm
Maximum Speed2 N/A 1000 rpm

Centrifugal Loss Constant Cs

 N/A 2.55 E-06 bar/rpm2 37 E-06 psi/rpm2

Inertia

 N/A 252 lb·ft²10.58 kg·m²

Weight

 N/A 140 lb63 kg

Friction Area

 N/A 430 in²2774 cm²

New Friction Lining Thickness

 N/A 0.33 in8 mm

Worn Friction Lining Thickness

 N/A 0.06 in2 mm
Air Tube Cavity3 N/A 280 in³4.59 dm³

Minimum Drum Diameter

 N/A 27.81 in706 mm

Dimension D2

 N/A 6.94 in176 mm

Dimension D24

 N/A 2.50 in64 mm

Dimension D25

 N/A 0.25 in6 mm
Dimension G4 N/A 36.000 in914.4 mm

Dimension G1

 N/A 33.00 in838 mm

Dimension H2

 N/A 34.750 in882.7 mm

Dimension H6

 N/A 28.19 in716 mm

Dimension H7

 N/A 34.50 in876 mm

Number of Mounting Holes

 N/A 16

Bolt Hole Size L

 N/A 0.625 in16 mm

Dimension O3

 N/A 0.50 in13 mm

Air Inlet Thread

 N/A 1/2-14

Angle Q

 N/A 11.250 º

Dimension V

 N/A 0.84 in21 mm

Number of Friction Shoes

 N/A 17

Friction Shoe Width (W)

 N/A 5.25 in133 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)