Discussion
Which of the following are true for buttress threads?
Answer: D
All three are true, so the answer is All of the mentioned.
A buttress thread has one flank almost square to the axis and the other inclined, so it combines the low friction and high efficiency of a square thread with the strength at the root of a trapezoidal (V-type) thread.
Because only the square flank carries the load efficiently, it transmits power in one direction only. That is exactly what is needed in vices, screw jacks and breech mechanisms of guns, where heavy force acts one way.
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