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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:
At = Tensile Strength Area of Screw Thread.
Esmin = Basic Minimum Pitch Diameter of External Thread
n = Number of threads per inch
Example; For a 1/2 - 13 UNC - 2A, see Thread Chart for pitch diameter data.
Esmin = .435
n = 13
At = 3.1416 (.4435/2 - 0.16238/13)2
At = .13757 = (Thread Stress Area)
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