Tap drill chart

Cutting-tap recommendations for the four sizes published so far. Each row opens its full sheet with source and conditions. Forming taps are not covered.

SHEET	THREAD	NOMINAL Ø	PITCH	TAP DRILL	DRILL Ø	CHECKED
FA-TD-1-4-20	1/4-20 UNC	0.25 in 6.35 mm	20 TPI	#7	0.2010 in 5.1054 mm	2026-09-09
FA-TD-10-32	10-32 UNF	0.190 in 4.826 mm	32 TPI	#21	0.1590 in 4.0386 mm	2026-09-09
FA-TD-8-32	8-32 UNC	0.164 in 4.1656 mm	32 TPI	#29	0.1360 in 3.4544 mm	2026-09-09
FA-TD-M6	M6 × 1.0	6 mm 0.23622 in	1.0 mm	5.0 mm	0.19685 in 5.0 mm	2026-09-09

4 OF 4 RELEASE-ONE RECORDS · NEXT CANDIDATES (10-24, 5/16-18, 6-32, 1/4-28) NOT PUBLISHED

Cutting taps only. Converted figures use 1 in = 25.4 mm exactly. Each linked sheet retains source conditions, attribution and checked date.

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