#10 Drill Bit Size and Diameter
A #10 drill bit measures 0.1935 in
4.91 mm · number-size drill · gauge bit, not a screw size
The #10 is a numbered drill bit in the American gauge series, measuring 0.1935 inches (4.91 mm). It sits between a #11 bit (0.1910 in) and a 13/64 in bit (0.2031 in). Careful: "#10" here is the bit gauge — the #10 screw size has its own pages for 10-24 and 10-32 threads.
At a glance
| Drill size | #10 |
|---|---|
| Diameter | 0.1935 in |
| Millimetres | 4.91 mm |
| Series | Number drill (gauge) 1–97 |
| Closest fractional | 3/16 in (0.1875 in, slightly smaller) |
What the #10 is used for
#10 is not the tap drill for a #10 screw thread. For 10-24 tapping use a #25 bit (0.1495 in). For 10-32 tapping use a #21 bit (0.1590 in). The #10 bit (0.1935 in) is a clearance/pilot gauge bit.
If you arrived looking for the drill for a #10 screw thread, follow the related cards below. The #10 bit itself is handy for close-clearance work on #10 screws and light pilot duty.
Related sizes
Other number drill bits
The neighbourhood of the #10 in the gauge series: