A reference for the 14 GD&T (ASME Y14.5) characteristics, modifiers and datum rules.
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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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Characteristics & modifiers
ASME Y14.5 geometric characteristics and modifiers. “Datum” marks controls that reference a datum (form controls never do; profile may). Tap a row to copy the symbol.