10.8 mm Drill Size
metric drill
10.8 mm 0.4252 in 10.80 mm
A 10.8 mm drill is the standard tap drill for M12 x 1.25.
What a 10.8 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.
| Thread | % thread | Chart drill | Chart % |
|---|---|---|---|
| 1/2-13 | 74.9% | 27/64″ | 78.2% |
| M12 x 1.25 chart drill | 73.9% | 10.8 mm | 73.9% |
| M12 x 1.5 | 61.6% | 10.5 mm | 77.0% |
| M12 x 1.75 | 52.8% | 10.2 mm | 79.2% |
Other jobs for a 10.8 mm
- Hard-material tap drill
- The size to use in stainless or tool steel for M12 x 1.5, where it leaves a shallower thread than the standard drill and cuts tapping torque.
Drills either side
10.8 mm drill: common questions
What size is a 10.8 mm drill?
0.4252 inches, which is 10.80 mm. It is a metric drill.
What can I tap with a 10.8 mm drill?
4 threads: 1/2-13 at 74.9%, M12 x 1.25 at 73.9%, M12 x 1.5 at 61.6%, M12 x 1.75 at 52.8%.
Is a 10.8 mm drill the standard tap drill for anything?
Yes, for M12 x 1.25 (73.9% thread). That is the size published tap and drill charts give.
What drill is next to a 10.8 mm?
Down: 27/64 in at 0.4219 in. Up: 10.9 mm at 0.4291 in.