Multiple choice general knowledge

A screw having co-efficient of friction equal to or greater than the tangent of the load angle is known as

  1. Machine screw

  2. Ball-bearing type screw

  3. Self-locking screw

  4. Set screw
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A self-locking screw is designed so that the coefficient of friction is greater than or equal to the tangent of the lead angle. This condition ensures that the screw will not loosen or rotate under load - friction alone prevents backward motion. Machine screws, ball-bearing screws, and set screws do not have this self-locking property by design.

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