External Screw Thread Calculator

Learn how to calculate external screw thread dimensions with this easy-to-follow guide. Calculate pitch, major diameter, minor diameter, and more with our free calculator.

A mechanical calculator that calculates the shear area of an external thread (screw or fastener) based on the minor diameter of the tapped hole is available.

Min. Pitch Dia External Thread
Max. Minor Dia. Internal Thread
Fastener Thread Engagement
Threads per inch
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    3 Number of calculations
    A_s = \pi \times n \times L_c \times K_n (\frac{1}{2n}+0.57735(E_s min - K_n max))


    • Kn max = Maximum minor diameter of internal thread
    • Es min = Minimum pitch diameter of external thread
    • Le = Fastener thread engagement
    • n = Number of threads per inch