43/64" drill size
A 43/64 in drill is 0.6719 in (17.07 mm). It sits between 21/32 in and 11/16 in in the fractional series; the nearest metric drill is 17.1 mm.
43/64" 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 |
|---|---|---|---|---|
| 17.0 mm | 0.6693" | −0.066 mm | −0.0026" | Smaller |
| 17.1 mm | 0.6732" | +0.034 mm | +0.0014" | 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 43/64" 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 |
|---|---|---|---|
| 3/4-10 UNC | 21/32 | 60 % | Hard, tough metals |
Clearance for screws and bolts
Bolts and screws a 43/64" 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 |
|---|---|---|---|---|
| 5/8" bolt | 0.6250" | 0.0469" | 0.0234" | – |
| M16 bolt | 16 mm | 1.07 mm | 0.53 mm | Close fit (close 17, normal 17.5 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 43/64 in drill?
A 43/64 in drill is 0.6719 in, which is 17.07 mm (17.0656 mm exactly).
What is the metric equivalent of a 43/64 in drill?
The nearest metric drill is 17.1 mm, 0.034 mm larger. The other close size is 17.0 mm.
What thread can I tap with a 43/64 in drill?
It leaves about 60 % thread in 3/4-10 UNC.
What does a 43/64 in drill clear?
It clears a M16 bolt with 1.07 mm total clearance (0.53 mm per side); for metric bolts: close fit.