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CoryPad and Scott, If both of you would be so kind to supply your e-mail addresses I will be able to provide more data than is conviently possible with these messages. A colleague plotted data and ran calculations that shows the ASTM equation overstates the effective area of applied stress. An...

I have derived the first equation, but have not had time to derive the second one. A real issue in determining the area to be used in calculating tensile stresses in fasteners is whether to include any of the thread area in the cross-sectional area. The first equation (used in ASTM F606, eq...

The equation to calculate the thread stress area in ASTM F606-95b if found in paragraph 3.4.2, equation (1): A= 0.7854[D- (0.9743)/n]squared In the 26th Edition of Machinery Handbook, Page 1490, a topic: "Formulas for stress areas and lengths of engagement of screw threads" The above...

ASTM F606 provides a method for calculating the stress area for tensile testing of fasteners. Machinery Handbook (26th Edition)shows two equations for the same calculation. The second equation is for steels with an ultimate tensile strength of greater than 100,00 psi. Who devised the second...