An Acme Thread Tap creates a trapezoid-shaped thread used for rotary and motion transfer on machines. The acme thread, with a 29 degree included angle, is also used in in presses, jacks, valves or other mechanisms that move heavy loads. Because of the severity and nature of the cut needed to produce acme threads, North American Tool employs specialized engineering and design to manufacture its Acme Thread Taps.
A Trapezoidal Tap is the metric equivalent of Acme Taps but has a 30-degree included angle.
Acme and Trapezoidal Taps from North American Tool