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Provides a visual test to determine if screw retains original applied torque in situations where ground wires or safety devices are required.
English (United States)
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A Multi-Colored Shear Head Drive to Assure Correct Torque Or Tightness
With Visual Assurance for Fail Safe Application
Provides a visual test to determine if screw retains original applied torque in
situations where ground wires or safety devices are required.
A screw (Figure 1) is driven by a molded colored drive head (2) which is
designed to shear or break off when the correct torque is reached. When the
molded head is broken off the tapered slot (3) will retain a colored slug (4)
(Figure 2). While the slug is in place, it indicates that correct torque has been
applied. When the slug is missing, it indicates that the screw is no longer at
correct torque and a potential hazard exists.