27/32" drill size
A 27/32 in drill is 0.8438 in (21.43 mm). It sits between 53/64 in and 55/64 in in the fractional series; the nearest metric drill is 21.4 mm.
27/32" 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 |
|---|---|---|---|---|
| 21.4 mm | 0.8425" | −0.031 mm | −0.0012" | Smaller |
| 21.5 mm | 0.8465" | +0.069 mm | +0.0027" | 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 27/32" 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 |
|---|---|---|---|
| M24 × 3 | 21 mm | 66 % | Good in steel |
Clearance for screws and bolts
Bolts and screws a 27/32" 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 |
|---|---|---|---|---|
| M20 bolt | 20 mm | 1.43 mm | 0.72 mm | Close fit (close 21, normal 22 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 27/32 in drill?
A 27/32 in drill is 0.8438 in, which is 21.43 mm (21.4312 mm exactly).
What is the metric equivalent of a 27/32 in drill?
The nearest metric drill is 21.4 mm, 0.031 mm smaller. The other close size is 21.5 mm.
What thread can I tap with a 27/32 in drill?
It leaves about 66 % thread in M24 × 3.
What does a 27/32 in drill clear?
It clears a M20 bolt with 1.43 mm total clearance (0.72 mm per side); for metric bolts: close fit.