#53 drill size
A #53 drill is 0.0595 in (1.51 mm). It is the standard tap drill for #1-64 UNC and #1-72 UNF; the nearest metric drill is 1.5 mm.
#53 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 |
|---|---|---|---|---|
| 1.5 mm | 0.0591" | −0.011 mm | −0.0004" | Smaller |
| 1.55 mm | 0.0610" | +0.039 mm | +0.0015" | 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 #53 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).
Number drill index
Every size in the series, holes drawn to scale.
Common questions
What size is a #53 drill?
A #53 drill is 0.0595 in, which is 1.51 mm (1.5113 mm exactly).
What is the metric equivalent of a #53 drill?
The nearest metric drill is 1.5 mm, 0.011 mm smaller. The other close size is 1.55 mm.
What tap uses a #53 drill?
A #53 drill is the standard tap drill for #1-64 UNC (about 67 % thread) and #1-72 UNF (about 75 % thread).
Which fractional drill is closest to #53?
1/16 in (0.0625 in) is the closest, 0.0030 in larger.