E Drill Size

letter drill

E 0.250 in 6.35 mm

A E drill measures 0.250 in. It taps 1 thread in this chart.

What a E 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 E drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread	% thread	Chart drill	Chart %
M7 x 1	50.0%	6 mm	77.0%

Drills either side

D 0.246 in · 6.25 mm Next size down
F 0.257 in · 6.53 mm Next size up

All drill sizes → · Open this drill in the calculator →

E drill: common questions

What size is a E drill?

0.250 inches, which is 6.35 mm. It is a letter drill.

What can I tap with a E drill?

1 thread: M7 x 1 at 50.0%.

What drill is next to a E?

Down: D at 0.246 in. Up: F at 0.257 in.