### Tensile Thread Stress Area Equation and Calculator - 100 ksi and More

**Standard ANSI Hardware**

**Fastener - Bolt Design Calculations **

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

*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.*

This calculator will calculate the unknown for the given conditions.
**Two**__ (2) inputs
are required,__ See the application illustration at bottom of page.

**Where:**

**= Tensile Strength Area of Screw Thread.**

*A*_{t}*- Thread Engineering Data Chart*

**E**MinimumPitch Diameter of External Thread_{s}min =*= Number of threads per inch*

**n**This equation is a more conservative extimation of actual thread stress area as opposed to the equation for Tensile Thread Stress Area 100 ksi and Less.

**Example**; For a 1/2 - 13 UNC - 2A, see Thread Engineering Data Chart for minimum pitch diameter data.

* E_{s}min* = .4435

**= 13**

*n*A_{t} = 3.1416 (.4435/2 - 0.16238/13)^{2}

A_{t} = .13757 = (Thread Stress Area)

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