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Torque Rating (75 psi/5.5 bar)

228000 lb·in
25760 Nm

Maximum Speed

1400 rpm

Centrifugal Loss Cs

27 E-06 psi/rpm2|1.86 E-06 bar/rpm2


380 lb·ft²
15.96 kg·m²


430 lb
195 kg

Friction Area

940 in²
6063 cm²

Friction Lining Thickness


New Friction Lining Thickness


Worn Friction Lining Thickness


Air Tube Cavity >> in³ [Imperial]

510 in³
8.36 dm³

Minimum Drum Diameter

15.91 in
404 mm

Dimension D2

23.69 in
602 mm

Dimension D3

0.31 in
8 mm

Dimension D24


Dimension D25

0.63 in
16 mm

Dimension G

25.500 in
647.7 mm

Tolerance for Sizes (G)

+0.000/-0.005 in
+0.00/-0.13 mm

Dimension H2

24.375 in
619.1 mm

Dimension H6

16.22 in
412 mm

Dimension H7

24.38 in
619 mm

Number of Hole L


Diameter L


Dimension O3


Dimension O4 (Number)


Dimension O4 (Size)


Angle Q


Dimension V

0.78 in
20 mm

W Number


Friction Shoe Width (W)

22.13 in
562 mm


Ventilated Construction
Friction shoe backing plates have large air passages through their entire length. This construction coupled with scalloped side plates allows cooling air to flow through the element. In addition, the large exposed inside diameter assures the coolest possible operation. None of the heat is generated deep in the element’s internal parts where it can be trapped. The open construction assures rapid heat dissipation.
The VC clutch can be dismantled on the shaft to gain access to its component parts. All parts are available as replacement parts.
A limited number of element sizes are available in a split configuration. They are used in applications having limited axial access for element maintenance. The following pages give additional descriptive information, selection procedures and common clutch and brake arrangements for the complete VC product line.

Where Used

Grinding Mills
Marine Propulsion
Metal Forming Machinery
Oil Field Machinery




Air Applied

General Description

VC design and construction is different from the CB and CM elements in that the torque is transmitted by torque bars rather than the sidewalls of the actuating tube. The loose actuating tube is contained within a housing formed by a rim and two side plates. and is replaceable. The torque bars, which are held in position by the side plates, pass through cavities in the backing plates of the friction shoes. Pressurizing the actuating tube forces the friction shoes to engage around a cylindrical drum. Leaf springs in the torque bar cavities of the backing plates retract the friction shoes when the actuating tube pressure is released. Element torque capacity is dependent upon the applied pressure and rotating speed. Catalog ratings are given at 75 psi (5.2 bar) and zero rpm. Maximum recommended pressure is 125 psi (8.6 bar). Adjustment for pressure and speed is explained under Selection Procedure.
VC elements are available in 24 sizes which are identified by the drum diameter in inches on which they constrict and the width in inches of its friction lining. For a given drum diameter it is possible to have two different lining widths. For this reason, the elements are grouped by lining width into a narrow series and a wide series. As an example, the narrow series 20VC600 and the wide series 20VC1000 both constrict on a 20 inch diameter drum. But, the narrow unit has a lining width of 6 inches, and the wide unit has a lining width of 10 inches. The smallest VC element will constrict on a 11.5 inch (292 mm) diameter drum and the largest on a 76 inch (1930 mm) diameter drum.
Two elements of a narrow series can be bolted together to form a dual element having twice the torque capacity of a single element. With the exception of the 14VC1000 element, the wide series elements can also be dualed. The large drum hub diameter and small drum diameter restricts the radial space available for mechanically connecting the drums to the hub and makes dualing the 14VC1000 elements impractical.
The VC design offers the following features in addition to the constricting features described earlier in this section.


Part Number refers to basic part number only. When ordering, the number of air inlets and type of connection must be specified.

1 Maximum rpm is dependent upon operating conditions and varies for each application. Consult factory for applications exceeding these speeds.
2 Drum contact with worn shoes.