Drill sizes and tap references, clearly sourced and easy to use.

Each sheet gives the answer first, then its conditions, the source it came from and the date it was checked. Compare any diameter against the chart. Print a sheet. No signup.

OPEN DRILL CHART HOW WE VERIFY

SHEETTITLETYPE

FA-TD-1-4-201/4-20 tap drill sizeTAP FA-TD-10-3210-32 tap drill sizeTAP FA-TD-8-328-32 tap drill sizeTAP FA-TD-M6M6 × 1.0 tap drill sizeTAP FA-DC-164Drill bit size chartfractional, number, letter, metric · compare ØCHART FA-TC-004Tap drill chartfour release-one sizesCHART

RELEASE ONE · 4 TAP SHEETS · 164 DRILL DESIGNATIONS · CUTTING TAPS ONLY

SOURCE Metric, Inch & Fractional Inch shop size table · v.2, 2007-02-12; Manufacturing Processes 4-5 — Unit 5: Tapping · Archived 2026-04-15; accessed 2026-09-09; bd_warehouse tap hole sizes · 4006fb03b2a022d11abd41fc4c24a3a042f25ea0 · 1 IN = 25.4 MM EXACTLY
CircuitousRoot shop size table v.2 (2007-02-12). Public Domain. Fractions and conversions recalculated.; Adapted from Unit 5: Tapping, LamNgeun Virasak, Open Oregon. CC BY 4.0: https://creativecommons.org/licenses/by/4.0/ . Selected rows; wording adapted.; bd_warehouse, Copyright 2024 Gumyr. Apache License 2.0. Selected Soft-column values; presentation adapted. Licence: fasteneratlas.com/licenses/bd-warehouse-Apache-2.0.txt.
DATASET 2026.09.09