7/64" drill size
A 7/64 in drill is 0.1094 in (2.78 mm). It sits between 3/32 in and 1/8 in in the fractional series; the nearest metric drill is 2.8 mm.
7/64" 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 |
|---|---|---|---|---|
| 2.75 mm | 0.1083" | −0.028 mm | −0.0011" | Smaller |
| 2.8 mm | 0.1102" | +0.022 mm | +0.0009" | 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 7/64" 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).
Clearance for screws and bolts
Bolts and screws a 7/64" 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 |
|---|---|---|---|---|
| #1 screw | 0.0730" | 0.0364" | 0.0182" | – |
| #2 screw | 0.0860" | 0.0234" | 0.0117" | – |
| M2.5 bolt | 2.5 mm | 0.28 mm | 0.14 mm | Close fit (close 2.7, normal 2.9 mm) |
| #3 screw | 0.0990" | 0.0104" | 0.0052" | – |
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 7/64 in drill?
A 7/64 in drill is 0.1094 in, which is 2.78 mm (2.7781 mm exactly).
What is the metric equivalent of a 7/64 in drill?
The nearest metric drill is 2.8 mm, 0.022 mm larger. The other close size is 2.75 mm.
What thread can I tap with a 7/64 in drill?
It leaves about 71 % thread in #6-32 UNC.
Which number or letter drill is closest to 7/64 in?
#35 (0.1100 in) is the closest, 0.0006 in larger.
What does a 7/64 in drill clear?
It clears a #3 screw with 0.0104" total clearance (0.0052" per side).