#8-32 UNC tap drill size

#29 drill — 0.1360 in / 3.45 mm (69% thread)

Major Ø 0.1640 in · 32 threads per inch · coarse series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
9/64	0.1406	3.57	58%
#28	0.1405	3.57	58%
#29	0.1360	3.45	69%
#30	0.1285	3.26	87%

Cut taps only — roll-form taps need a larger hole. 65–75% suits general work; drop toward 55% in tough material. Verify before you cut.

Same size, fine series: #8-36 UNF