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Acme Thread

A screw thread having a 29 degree included angle. Used largely for feed and adjusting screws on machine tools.


The Acme thread is easier to machine and is stronger than the square thread.
Number of threads per inchDepth of thread [inches]Width at top of thread [inches]Width at bottom of thread [inches]Space at top of thread [inches]Thickness at root of thread [inches]
10.5100.3710.3660.6290.635
11/30.3850.2780.2730.4720.477
20.2600.1850.1800.3150.320
30.1770.1240.1180.2100.215
40.1350.0930.0880.1570.163
50.1100.0740.0690.1260.131
60.0930.0620.0570.1050.110
70.0810.0530.0480.0900.095
80.0730.0460.0410.0790.084
90.0660.0410.0360.0700.075
100.0600.0370.0320.0630.068

Note: all dimensions in the above table are in inches.

See also: British Association Threads, British Standard Whitworth, Thread.

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Mechanical Engineering
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