THREAD MEASURING WIRE FORMULAS
show the screw to be larger than the true condition. The formulas are for any wire size which will fit in the thread. The approximate formula for Best Size Wires is: G = secant a 2n For 60° threads Best Size Wires G = .57735 or .57735p n For 55° threads Best Size Wires G = .56369 or .56369p n
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