### Tensile Thread Stress Area Equation and Calculator less than 100 ksi

**Standard ANSI Hardware**

**Fastener - Bolt Design Calculations **

**This calculator requires a
java - enabled browser****)**

*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:

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:

** A_{t}** = 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

Equation:

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.

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