Tap Drill Size Chart

2.05 mm Drill Size

metric drill

2.05 mm 0.0807 in 2.05 mm

A 2.05 mm drill is the standard tap drill for M2.5 x 0.45.

What a 2.05 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 2.05 mm drill taps, with the percent of thread each one gets and the published chart drill for comparison.
Thread % thread Chart drill Chart %
#3-56 78.9% #45 73.3%
M2.5 x 0.45 chart drill 77.0% 2.05 mm 77.0%
#3-48 67.6% #47 75.7%

Drills either side

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

2.05 mm drill: common questions

What size is a 2.05 mm drill?
0.0807 inches, which is 2.05 mm. It is a metric drill.
What can I tap with a 2.05 mm drill?
3 threads: #3-56 at 78.9%, M2.5 x 0.45 at 77.0%, #3-48 at 67.6%.
Is a 2.05 mm drill the standard tap drill for anything?
Yes, for M2.5 x 0.45 (77.0% thread). That is the size published tap and drill charts give.
What drill is next to a 2.05 mm?
Down: #47 at 0.0785 in. Up: #46 at 0.081 in.