Question

A self-locking screw is one which

• A. Has locking arrangement
• B. Has a hole drilled through for inserting locking pin
• C. Has coefficient of friction equal to or greater than the tangent of the load angle
• D. Has fine pitch screw threads

Hint:

Efficiency of a self-locking screw is always less than 50%. If efficiency exceeds 50%, the screw is "overhauling" and will unwind under its own load.

Answer 1

The Correct Option is C