61/64" drill size
A 61/64 in drill is 0.9531 in (24.21 mm). It sits between 15/16 in and 31/32 in in the fractional series; the nearest metric drill is 24.2 mm.
61/64" 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 |
|---|---|---|---|---|
| 24.2 mm | 0.9528" | −0.009 mm | −0.0004" | Smaller |
| 24.3 mm | 0.9567" | +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 61/64" 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 |
|---|---|---|---|
| M27 × 3 | 24 mm | 72 % | Good in steel |
Clearance for screws and bolts
Bolts and screws a 61/64" 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 |
|---|---|---|---|---|
| M22 bolt | 22 mm | 2.21 mm | 1.10 mm | Normal fit (normal 24, loose 26 mm) |
| M24 bolt | 24 mm | 0.21 mm | 0.10 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 61/64 in drill?
A 61/64 in drill is 0.9531 in, which is 24.21 mm (24.2094 mm exactly).
What is the metric equivalent of a 61/64 in drill?
The nearest metric drill is 24.2 mm, 0.009 mm smaller. The other close size is 24.3 mm.
What thread can I tap with a 61/64 in drill?
It leaves about 72 % thread in M27 × 3.
What does a 61/64 in drill clear?
It clears a M24 bolt with 0.21 mm total clearance (0.10 mm per side); for metric bolts: tighter than close fit.