Power-transmitting screw threads: best choice when power is transmitted in one direction only Select the thread form that is mechanically best suited for heavy load transmission predominantly in a single direction. Choose the correct option.
Mechanical Engineering
Machine Design
Difficulty: Easy
Choose an option
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ASquare threads
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BAcme threads
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CKnuckle threads
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DButtress threads
Answer
Correct Answer: Buttress threads
Explanation
ConceptButtress threads combine the high efficiency of a square thread in the load direction with a stronger tooth form, making them ideal where heavy force acts primarily in one direction (e.g., presses, jacks).
Why others are less suitableSquare is efficient but weaker at the root; Acme is stronger but less efficient; Knuckle is for rough/rolling engagement, not precision power screws.
Final AnswerButtress threads