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Square thread standards

Square thread standards

Square thread standards

(OP)
I have recently been given the task of re-engineering a lead nut for a machine tool. The thread is a square section that doesn't seem to comform to any standard i am aware of or can find. The thread is Ø1.75" X .375" pitch, however the length of crown is not pitch/2. Any suggestions on a standard to follow?

RE: Square thread standards

ISO 2901, 2902, and 2003 cover metric trapezoidal screw threads.  It looks like you are interested in inch-based screw threads, which would be covered by ASME/ANSI.  I am not sure about the specific ASME/ANSI standards that would apply here.

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