#12-28 UNF tap drill size

#14 drill — 0.1820 in / 4.62 mm (73% thread)

Major Ø 0.2160 in · 28 threads per inch · fine series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
#13	0.1850	4.70	67%
#14	0.1820	4.62	73%
#15	0.1800	4.57	78%
#16	0.1770	4.50	84%

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: #12-24 UNC