#4-40 UNC tap drill size

#43 drill — 0.0890 in / 2.26 mm (71% thread)

Major Ø 0.1120 in · 40 threads per inch · coarse series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
#42	0.0935	2.37	57%
#43	0.0890	2.26	71%
#44	0.0860	2.18	80%
#45	0.0820	2.08	92%

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: #4-48 UNF