#4-48 UNF tap drill size

#42 drill — 0.0935 in / 2.37 mm (68% thread)

Major Ø 0.1120 in · 48 threads per inch · fine series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
#41	0.0960	2.44	59%
3/32	0.0938	2.38	67%
#42	0.0935	2.37	68%
#43	0.0890	2.26	85%

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, coarse series: #4-40 UNC