Trigonometry, powers, logarithms, and the numbers in between.
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Three-wire measurements for Unified inch and ISO metric threads.
Measure over wires
The default commercial-quality class for general fastening. Assume this grade unless a print says otherwise.
The best wire touches the flanks exactly on the pitch line, so a slightly off flank angle does not throw the reading. For this pitch that is 0.02887 in.
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