3/4-16 UNF tap drill size

11/16 drill — 0.6875 in / 17.46 mm (77% thread)

Major Ø 0.7500 in · 16 threads per inch · fine series. The chart pick targets 75% thread; nearby standard drills:

Drill	Decimal (in)	mm	Thread %
23/32	0.7188	18.26	38%
45/64	0.7031	17.86	58%
11/16	0.6875	17.46	77%
43/64	0.6719	17.07	96%

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: 3/4-10 UNC