#36 Drill Bit Size and Diameter
A #36 drill bit measures 0.1065 in
2.71 mm · number-size drill · used as the 6-32 tap drill
The #36 is a numbered drill bit in the American gauge series, measuring 0.1065 inches (2.71 mm). It sits between a #37 bit (0.1040 in) and a #35 bit (0.1100 in). It is best known as the standard tap drill for a 6-32 UNC machine screw thread.
At a glance
| Drill size | #36 |
|---|---|
| Diameter | 0.1065 in |
| Millimetres | 2.71 mm |
| Series | Number drill (gauge) 1–97 |
| Closest fractional | 7/64 in (0.1094 in, slightly larger) |
What the #36 is used for
6-32 tap drill: drillØ = major − (pitch × 0.75) = 0.1380 − (0.0313 × 0.75) = 0.1145 in → nearest standard bit = #36 (0.1065 in)
A #36 hole before a 6-32 tap gives the standard ~75% thread engagement. For a slightly looser thread in soft material a #33 bit (0.1130 in) works; for a clearance hole a #23 bit is the close fit.
Related sizes
Other number drill bits
The neighbourhood of the #36 in the gauge series: