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This calculator calculates the tensile stress area
of a external screw thread of a fastener. Use this calculator for materials over 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.
Esmin = Basic Minimum Pitch Diameter of External Thread example;
For a 1/2 - 13 UNC - 2A, minimum pitch diameter = .4041 in
see Thread Chart
for pitch diameter data
n = Number of threads per inch
Equation:
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