37/64" drill size
A 37/64 in drill is 0.5781 in (14.68 mm). It is the standard tap drill for 5/8-18 UNF; the nearest metric drill is 14.7 mm.
37/64" at a glance
Decimal, metric and the nearest sizes in the other series.
- Decimal inch
- 0.5781"
- Millimetres
- 14.68 mm 14.6844
- Nearest metric drill
- 14.7 mm +0.016 mm
- Hole area
- 0.263 in² 169.4 mm²
- Tap drill for
- 5/8-18 UNF
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 |
|---|---|---|---|---|
| 14.6 mm | 0.5748" | −0.084 mm | −0.0033" | Smaller |
| 14.7 mm | 0.5787" | +0.016 mm | +0.0006" | 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 37/64" 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 |
|---|---|---|---|
| 5/8-18 UNF | 37/64 | 65 % | Standard drill |
| M16 × 1.5 | 14.5 mm | 68 % | Good in steel |
Clearance for screws and bolts
Bolts and screws a 37/64" 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 |
|---|---|---|---|---|
| M14 bolt | 14 mm | 0.68 mm | 0.34 mm | Tighter than close fit (15 mm) |
| 9/16" bolt | 0.5625" | 0.0156" | 0.0078" | – |
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 37/64 in drill?
A 37/64 in drill is 0.5781 in, which is 14.68 mm (14.6844 mm exactly).
What is the metric equivalent of a 37/64 in drill?
The nearest metric drill is 14.7 mm, 0.016 mm larger. The other close size is 14.6 mm.
What tap uses a 37/64 in drill?
A 37/64 in drill is the standard tap drill for 5/8-18 UNF (about 65 % thread).
What does a 37/64 in drill clear?
It clears a 9/16" bolt with 0.0156" total clearance (0.0078" per side).