#5-44 UNF tap drill size

#37 drill — 0.1040 in / 2.64 mm (71% thread)

Major Ø 0.1250 in · 44 threads per inch · fine series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
#36	0.1065	2.71	63%
#37	0.1040	2.64	71%
#38	0.1015	2.58	80%
#39	0.0995	2.53	86%

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: #5-40 UNC