Tensile Thread Stress Area Equation and Calculator less than 100 ksi

Standard ANSI Hardware
Fastener - Bolt Design Calculations

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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.

The critical areas of stress of mating screw threads are:

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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 Thread Engineering Data Chart

n = Number of threads per inch
Thread stress area dimensions


Thread Stress Area

This equation provides an approximate result by extrapolation on the thread stress area of a fastener.This equation is adequate for design applications on engineering materials or less than 100 ksi ultimate strength.