9/64" drill size
A 9/64 in drill is 0.1406 in (3.57 mm). It sits between 1/8 in and 5/32 in in the fractional series; the nearest metric drill is 3.6 mm.
9/64" 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 |
|---|---|---|---|---|
| 3.5 mm | 0.1378" | −0.072 mm | −0.0028" | Smaller |
| 3.6 mm | 0.1417" | +0.028 mm | +0.0011" | 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 9/64" 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 9/64" 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 |
|---|---|---|---|---|
| #2 screw | 0.0860" | 0.0546" | 0.0273" | – |
| #3 screw | 0.0990" | 0.0416" | 0.0208" | – |
| #4 screw | 0.1120" | 0.0286" | 0.0143" | – |
| M3 bolt | 3 mm | 0.57 mm | 0.29 mm | Normal fit (normal 3.4, loose 3.6 mm) |
| #5 screw | 0.1250" | 0.0156" | 0.0078" | – |
| M3.5 bolt | 3.5 mm | 0.07 mm | 0.04 mm | Tighter than close fit (3.7 mm) |
| #6 screw | 0.1380" | 0.0026" | 0.0013" | – |
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 9/64 in drill?
A 9/64 in drill is 0.1406 in, which is 3.57 mm (3.5719 mm exactly).
What is the metric equivalent of a 9/64 in drill?
The nearest metric drill is 3.6 mm, 0.028 mm larger. The other close size is 3.5 mm.
What thread can I tap with a 9/64 in drill?
It leaves about 66 % thread in M4 × 0.5 and 65 % in #8-36 UNF.
Which number or letter drill is closest to 9/64 in?
#28 (0.1405 in) is the closest, 0.0001 in smaller.
What does a 9/64 in drill clear?
It clears a #6 screw with 0.0026" total clearance (0.0013" per side).