Discussion
Included angle between flanks of Acme thread is:
Answer: D
The included angle between the flanks of an Acme thread is 29 degrees.
The Acme thread is a trapezoidal power-transmission thread, used for lead screws on lathes and for screw jacks. Its 29 degree angle gives a stronger thread, easier to cut and engage with a split nut than a square thread.
60 degrees is the angle of ISO metric and unified threads. 45 degrees appears on one flank of a buttress thread. A 90 degree included angle is not used for screw threads.
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