#41 drill bit size
0.096 in
2.44 mm · number drill
| Inches | 0.096 in |
| Millimetres | 2.44 mm |
| Nearest metric drill | 2.4 mm |
| System | Number (#1 to #60) |
What #41 means
A bit marked #41 is a number drill, and the number is an index rather than a measurement — the higher the number, the smaller the bit. #1 is 0.228 inches and #60 is 0.04. That is the opposite of the fractional sizes stamped on a home set, which is why a number drill and a fraction of similar appearance can be very different holes.
The same hole in the other systems
Three drill systems overlap across this range and a workshop rarely has all three. The nearest bit of each other kind to #41:
| System | Nearest size | Difference |
|---|---|---|
| letter | A — 0.234 in | 0.138 in larger |
| fractional | 3/32" — 0.0938 in | 0.0023 in smaller |
| metric | 2.4 mm | 0.038 mm smaller |
One of those is within three thousandths of an inch, which is inside the tolerance of most hand-held work — substitute it and nobody will know.
What gets drilled at 0.096 inches
This is circuit-board and small-pin range — component leads, header pins, the holes a hobbyist drills in perfboard. It is also where the smallest machine-screw taps live, so a drill here is as likely to be preparing a thread as clearing a wire.
Either side of it
| Drill | Inches | Millimetres |
|---|---|---|
| #43 | 0.089 in | 2.26 mm |
| #42 | 0.0935 in | 2.37 mm |
| 3/32" | 0.0938 in | 2.38 mm |
| #41 | 0.096 in | 2.44 mm |
| #40 | 0.098 in | 2.49 mm |
| #39 | 0.0995 in | 2.53 mm |
| #38 | 0.1015 in | 2.58 mm |
Frequently asked questions
What size is a #41 drill bit?
0.096 inches, which is 2.44 mm. Number drills run from #1 at 0.228 inches down to #60 at 0.04, getting smaller as the number rises — the opposite of what most people expect the first time.
What is a #41 drill bit in mm?
2.44 mm. A metric index will offer 2.4 mm as the nearest stocked size, which is 0.038 mm smaller — enough to matter when tapping and not enough to matter for a clearance hole.
Is #41 a tapping drill size?
Not for any of the unified threads on this site. It sits between the sizes the standard taps call for, so it is a clearance or pilot drill rather than a tapping one.
What is the next size up from #41?
#40 at 0.098 inches — 0.002 inches larger. Below it is 3/32" at 0.0938.
Other sizes
- #40 drill bit — 0.098 in, 2.49 mm
- #39 drill bit — 0.0995 in, 2.53 mm
- #38 drill bit — 0.1015 in, 2.58 mm
- #37 drill bit — 0.104 in, 2.64 mm
- #36 drill bit — 0.1065 in, 2.71 mm
- 7/64" drill bit — 0.1094 in, 2.78 mm
- #35 drill bit — 0.11 in, 2.79 mm
- #34 drill bit — 0.111 in, 2.82 mm