29/64" drill size
A 29/64 in drill is 0.4531 in (11.51 mm). It is the standard tap drill for 1/2-20 UNF; the nearest metric drill is 11.5 mm.
29/64" at a glance
Decimal, metric and the nearest sizes in the other series.
- Decimal inch
- 0.4531"
- Millimetres
- 11.51 mm 11.5094
- Nearest metric drill
- 11.5 mm −0.009 mm
- Hole area
- 0.161 in² 104.0 mm²
- Tap drill for
- 1/2-20 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 |
|---|---|---|---|---|
| 11.5 mm | 0.4528" | −0.009 mm | −0.0004" | Smaller |
| 11.6 mm | 0.4567" | +0.091 mm | +0.0036" | 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 29/64" 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 |
|---|---|---|---|
| 1/2-20 UNF | 29/64 | 72 % | Standard drill |
Clearance for screws and bolts
Bolts and screws a 29/64" 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 |
|---|---|---|---|---|
| M10 bolt | 10 mm | 1.51 mm | 0.75 mm | Normal fit (normal 11, loose 12 mm) |
| 7/16" bolt | 0.4375" | 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 29/64 in drill?
A 29/64 in drill is 0.4531 in, which is 11.51 mm (11.5094 mm exactly).
What is the metric equivalent of a 29/64 in drill?
The nearest metric drill is 11.5 mm, 0.009 mm smaller. The other close size is 11.6 mm.
What tap uses a 29/64 in drill?
A 29/64 in drill is the standard tap drill for 1/2-20 UNF (about 72 % thread).
What does a 29/64 in drill clear?
It clears a 7/16" bolt with 0.0156" total clearance (0.0078" per side).