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This calculator calculates the tensile stress area
of a screw thread fastener. Use this calculator for materials less than 100,000 psi ultimate tensile strength.
Open
Calculator Negative Tolerance numbers indicate interference. This calculator will calculate the unknown for the given conditions.
Two (2) inputs
are required, See the application illustration at bottom of page. The following are definitions for the elements:
At = tensile strength area of screw thread.
D = Basic major diameter, example; .500 for a
1/2 - 13 UNC - 2B
n = Number of threads per inch
Equation:
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