#10 drill size
A #10 drill is 0.1935 in (4.91 mm). It sits between #11 and #9 in the number series; the nearest metric drill is 4.9 mm.
#10 at a glance
Decimal, metric and the nearest sizes in the other series.
Nearest metric drills
Metric drills step by 0.05 mm below 3 mm and by 0.1 mm from 3 mm. Difference is metric minus inch size.
| Metric drill | Inch | Difference | In inches | Hole |
|---|---|---|---|---|
| 4.9 mm | 0.1929" | −0.015 mm | −0.0006" | Smaller |
| 5.0 mm | 0.1969" | +0.085 mm | +0.0034" | Larger |
Nearby inch drills
The next size down and up in each inch series, so you can pick a substitute from the drawer.
Threads a #10 drill can tap
Threads from the tap tables on this site that this drill can tap, with the thread percentage it leaves (55–85 % shown).
| Thread | Standard drill | Thread with this drill | Suits |
|---|---|---|---|
| M6 × 1 | 5 mm | 84 % | Soft metals, plastics |
Clearance for screws and bolts
Bolts and screws a #10 hole clears, with the diametral clearance and the gap each side. Metric sizes are compared with ISO 273.
| Fastener | Diameter | Clearance | Per side | ISO 273, metric only |
|---|---|---|---|---|
| #6 screw | 0.1380" | 0.0555" | 0.0277" | – |
| #8 screw | 0.1640" | 0.0295" | 0.0147" | – |
| #10 screw | 0.1900" | 0.0035" | 0.0018" | – |
Inch clearance is the drill size minus the basic major diameter. A drilled hole usually cuts slightly oversize.
Number drill index
Every size in the series, holes drawn to scale.
Common questions
What size is a #10 drill?
A #10 drill is 0.1935 in, which is 4.91 mm (4.9149 mm exactly).
What is the metric equivalent of a #10 drill?
The nearest metric drill is 4.9 mm, 0.015 mm smaller. The other close size is 5.0 mm.
What thread can I tap with a #10 drill?
It leaves about 84 % thread in M6 × 1.
Which fractional drill is closest to #10?
3/16 in (0.1875 in) is the closest, 0.0060 in smaller.
What does a #10 drill clear?
It clears a #10 screw with 0.0035" total clearance (0.0018" per side).