Thread angles for different screws

Hi, all:
does anybody know any good reference book where I can find thread as
well as helix angles for different types of screws?
Thank you,
Edgar Lobachevskiy
Reply to
Edgar Lobachevskiy
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The helix angle is easy. If you know the diameter and the number of threads per inch you can calculate the helix angle with simple geometry.
The reciprocal of the threads-per-inch is the lead. The pitch diameter multiplied by pi is the circumference of one thread. Unwind one turn of thread and you have a triangle with the adjacent side equal to the circumference and the opposite side equal to the lead of the screw. You do the math.
Don Kansas City
Reply to
Don A. Gilmore

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