3/4" drill size
A 3/4 in drill is 0.7500 in (19.05 mm). It sits between 47/64 in and 49/64 in in the fractional series; the nearest metric drills are 19.0 and 19.1 mm, equally close.
3/4" 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 |
|---|---|---|---|---|
| 19.0 mm | 0.7480" | −0.050 mm | −0.0020" | Smaller |
| 19.1 mm | 0.7520" | +0.050 mm | +0.0020" | 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 3/4" 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 3/4" 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 |
|---|---|---|---|---|
| M18 bolt | 18 mm | 1.05 mm | 0.52 mm | Close fit (close 19, normal 20 mm) |
Inch clearance is the drill size minus the basic major diameter. A drilled hole usually cuts slightly oversize.
Fractional drill index
Every size in the series, holes drawn to scale.
Common questions
What size is a 3/4 in drill?
A 3/4 in drill is 0.7500 in, which is 19.05 mm (19.0500 mm exactly).
What is the metric equivalent of a 3/4 in drill?
The nearest metric drill is 19.0 mm, 0.050 mm smaller. The other close size is 19.1 mm.
What does a 3/4 in drill clear?
It clears a M18 bolt with 1.05 mm total clearance (0.52 mm per side); for metric bolts: close fit.