#11 drill size
A #11 drill is 0.1910 in (4.85 mm). It sits between #12 and #10 in the number series; the nearest metric drill is 4.9 mm.
#11 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 |
|---|---|---|---|---|
| 4.8 mm | 0.1890" | −0.051 mm | −0.0020" | Smaller |
| 4.9 mm | 0.1929" | +0.049 mm | +0.0019" | 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 #11 drill can tap
No thread in the tap tables on this site falls between 55 and 85 % thread with this drill, so it is not a useful tap drill for them. Drills this size are mostly used for clearance, pilot and pin holes.
Clearance for screws and bolts
Bolts and screws a #11 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" | 0.0530" | 0.0265" | – |
| #8 screw | 0.1640" | 0.0270" | 0.0135" | – |
| #10 screw | 0.1900" | 0.0010" | 0.0005" | – |
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 #11 drill?
A #11 drill is 0.1910 in, which is 4.85 mm (4.8514 mm exactly).
What is the metric equivalent of a #11 drill?
The nearest metric drill is 4.9 mm, 0.049 mm larger. The other close size is 4.8 mm.
Which fractional drill is closest to #11?
3/16 in (0.1875 in) is the closest, 0.0035 in smaller.
What does a #11 drill clear?
It clears a #10 screw with 0.0010" total clearance (0.0005" per side).