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The type VC element assembly is specifically designed and built for severe clutch or brake applications in which large inertia loads and sustained slippage would normally result in loss of torque and reduced operating life.
Form VC-501




Torque Rating (75 psi/5.5 bar)

27 lb·in
3.05 Nm

Maximum Speed

1800 rpm

Centrifugal Loss Cs

23 E-06 psi/rpm2|1.59 E-06 bar/rpm2


43 lb·ft²
1.81 kg·m²


96 lb
43 kg

Friction Area

166 in²
1071 cm²

Friction Lining Thickness

0.32 in

New Friction Lining Thickness

8 mm

Worn Friction Lining Thickness

0.16 in
4 mm

Air Tube Cavity >> in³ [Imperial]

70 in³
1.15 dm³

Minimum Drum Diameter

11.41 in
290 mm

Dimension D2

6.13 in
156 mm

Dimension D3

0.23 in
6 mm

Dimension D24

2.38 in
60 mm

Dimension D25

0.38 in
10 mm

Dimension G

19.625 in
498.5 mm

Tolerance for Sizes (G)

+0.000/-0.005 in
+0.00/-0.20 mm

Dimension H2

18.875 in
479.4 mm

Dimension H6

11.63 in
295 mm

Dimension H7

18.88 in
479 mm

Number of Hole L


Diameter L

0.375 in
9.5 mm

Dimension O3

0.31 in
8 mm

Dimension O4 (Number)


Dimension O4 (Size)

3/8-18 NPT

Angle Q


Dimension V

0.56 in
0.56 mm

W Number


Friction Shoe Width (W)

5.00 in
127 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.