Tap Drill Size Chart

#68 Drill Size

number drill

#68 0.031 in 0.79 mm

A #68 drill measures 0.031 in. It taps 1 thread in this chart.

What a #68 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 #68 drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
M1 x 0.25 65.6% 0.75 mm 77.0%

Drills either side

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#68 drill: common questions

What size is a #68 drill?
0.031 inches, which is 0.79 mm. It is a number drill.
What can I tap with a #68 drill?
1 thread: M1 x 0.25 at 65.6%.
What drill is next to a #68?
Down: #69 at 0.0292 in. Up: #67 at 0.032 in.