Dimensions for socket head cap screws — head diameter and height, counterbore and clearance holes — per ASME B18.3.
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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Counterbore & clearance
Head Ø and height are spec maximums. Counterbore Ø is the standard clearance counterbore (cut it to head-height + a few thou deep). Clearance shows close / normal hole. Source ASME B18.3. Tap a row to copy the counterbore Ø.