Calculate the 3-wire measurement and pitch-diameter limits for Unified (UNC/UNF/UN) external threads, with best-wire sizes and class 1A/2A/3A tolerances per ASME B1.1.
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Reference aid — verify before you cut. Thread data per ASME B1.1 (Unified), ASME B1.8 (Stub Acme) and ISO 965 (metric M profile); charts cite their source in each tool. Formulas and data are checked against published standards, but errors and edge cases are possible — always confirm critical dimensions against the controlling standard or a calibrated gage before machining. No warranty; use at your own risk. Tap the star on a tool to favorite it.
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