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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
This calculator will calculate the unknown for the given conditions.
Two (2) inputs
are required, See the application illustration at bottom of page.
Where:
A_{t} = Tensile Strength Area of Screw Thread.
E_{s}min = MinimumPitch Diameter of External Thread
 Thread Engineering Data Chart
n = Number of threads per inch
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
n = 13
A_{t} = 3.1416 (.4435/2  0.16238/13)^{2}
A_{t} = .13757 = (Thread Stress Area)
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