17/64" drill size
A 17/64 in drill is 0.2656 in (6.75 mm). It sits between 1/4 in and 9/32 in in the fractional series; the nearest metric drill is 6.7 mm.
17/64" 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 |
|---|---|---|---|---|
| 6.7 mm | 0.2638" | −0.047 mm | −0.0018" | Smaller |
| 6.8 mm | 0.2677" | +0.053 mm | +0.0021" | 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 17/64" 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 |
|---|---|---|---|
| M8 × 1.25 | 6.8 mm | 77 % | Soft metals, plastics |
| 5/16-18 UNC | F | 65 % | Hard, tough metals |
Clearance for screws and bolts
Bolts and screws a 17/64" 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 |
|---|---|---|---|---|
| #12 screw | 0.2160" | 0.0496" | 0.0248" | – |
| M6 bolt | 6 mm | 0.75 mm | 0.37 mm | Normal fit (normal 6.6, loose 7 mm) |
| 1/4" bolt | 0.2500" | 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 17/64 in drill?
A 17/64 in drill is 0.2656 in, which is 6.75 mm (6.7469 mm exactly).
What is the metric equivalent of a 17/64 in drill?
The nearest metric drill is 6.7 mm, 0.047 mm smaller. The other close size is 6.8 mm.
What thread can I tap with a 17/64 in drill?
It leaves about 77 % thread in M8 × 1.25 and 65 % in 5/16-18 UNC.
Which number or letter drill is closest to 17/64 in?
Letter H (0.2660 in) is the closest, 0.0004 in larger.
What does a 17/64 in drill clear?
It clears a 1/4" bolt with 0.0156" total clearance (0.0078" per side).