Tap Drill Size Chart

3.3 mm Drill Size

metric drill

3.3 mm 0.1299 in 3.30 mm

A 3.3 mm drill is the standard tap drill for M4 x 0.7.

What a 3.3 mm drill taps

Every thread this drill cuts between 50% and 85% of thread, deepest first. Outside that band it is the wrong drill for the job, so nothing below that line is listed.

Threads a 3.3 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
#8-32 84.0% #29 69.0%
M4 x 0.7 chart drill 77.0% 3.3 mm 77.0%

Drills either side

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3.3 mm drill: common questions

What size is a 3.3 mm drill?
0.1299 inches, which is 3.30 mm. It is a metric drill.
What can I tap with a 3.3 mm drill?
2 threads: #8-32 at 84.0%, M4 x 0.7 at 77.0%.
Is a 3.3 mm drill the standard tap drill for anything?
Yes, for M4 x 0.7 (77.0% thread). That is the size published tap and drill charts give.
What drill is next to a 3.3 mm?
Down: #30 at 0.1285 in. Up: 3.4 mm at 0.1339 in.