13/64" drill size
A 13/64 in drill is 0.2031 in (5.16 mm). It sits between 3/16 in and 7/32 in in the fractional series; the nearest metric drill is 5.2 mm.
13/64" 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 |
|---|---|---|---|---|
| 5.1 mm | 0.2008" | −0.059 mm | −0.0023" | Smaller |
| 5.2 mm | 0.2047" | +0.041 mm | +0.0016" | 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 13/64" 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 |
|---|---|---|---|
| 1/4-20 UNC | #7 | 72 % | Good in steel |
| M6 × 1 | 5 mm | 65 % | Hard, tough metals |
Clearance for screws and bolts
Bolts and screws a 13/64" 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 |
|---|---|---|---|---|
| #8 screw | 0.1640" | 0.0391" | 0.0196" | – |
| #10 screw | 0.1900" | 0.0131" | 0.0066" | – |
| M5 bolt | 5 mm | 0.16 mm | 0.08 mm | Tighter than close fit (5.3 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 13/64 in drill?
A 13/64 in drill is 0.2031 in, which is 5.16 mm (5.1594 mm exactly).
What is the metric equivalent of a 13/64 in drill?
The nearest metric drill is 5.2 mm, 0.041 mm larger. The other close size is 5.1 mm.
What thread can I tap with a 13/64 in drill?
It leaves about 72 % thread in 1/4-20 UNC and 65 % in M6 × 1.
Which number or letter drill is closest to 13/64 in?
#6 (0.2040 in) is the closest, 0.0009 in larger.
What does a 13/64 in drill clear?
It clears a M5 bolt with 0.16 mm total clearance (0.08 mm per side); for metric bolts: tighter than close fit.