31/32" drill size
A 31/32 in drill is 0.9688 in (24.61 mm). It sits between 61/64 in and 63/64 in in the fractional series; the nearest metric drill is 24.6 mm.
31/32" 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 |
|---|---|---|---|---|
| 24.6 mm | 0.9685" | −0.006 mm | −0.0002" | Smaller |
| 24.7 mm | 0.9724" | +0.094 mm | +0.0037" | 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 31/32" 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 |
|---|---|---|---|
| M27 × 3 | 24 mm | 61 % | Hard, tough metals |
Clearance for screws and bolts
Bolts and screws a 31/32" 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 |
|---|---|---|---|---|
| M22 bolt | 22 mm | 2.61 mm | 1.30 mm | Normal fit (normal 24, loose 26 mm) |
| M24 bolt | 24 mm | 0.61 mm | 0.30 mm | Tighter than close fit (25 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 31/32 in drill?
A 31/32 in drill is 0.9688 in, which is 24.61 mm (24.6062 mm exactly).
What is the metric equivalent of a 31/32 in drill?
The nearest metric drill is 24.6 mm, 0.006 mm smaller. The other close size is 24.7 mm.
What thread can I tap with a 31/32 in drill?
It leaves about 61 % thread in M27 × 3.
What does a 31/32 in drill clear?
It clears a M24 bolt with 0.61 mm total clearance (0.30 mm per side); for metric bolts: tighter than close fit.