Screw To Drill Bit Size Chart
Reference page for using the correct size pilot drill per screw
When it comes to mechanics or even body work, I prefer using a welder. However there are times when sheet metal screws are required. There is nothing more aggravating when you just don't know what size drill bit to use for a pilot.
To help my readers out, I thought I would add this quick reference chart. This should help whenever you run into a situation you need to drill a pilot hole and are not sure the size bit.
I also have included the chart for drill bit size per tap size. In case you need to drill a hole and thread it for a screw or bolt.
Sheet Metal Screw to Drill Bit Size Table
Screw Size | Drill Bit Size |
|---|---|
2 | 3/32in |
4 | 1/8in |
6 | 5/32in |
8 | 3/16in |
10 | 13/64in |
12 | 1/4in |
1/4in | 9/32in |
5/16in | 21/64in |
3/8in | 25/64in |
Tap and Drill Size Chart (Standard)
Tap Size | Drill Bit | Drill Bit size inch |
|---|---|---|
0-80 | 3/64in | |
1-64 | 53 | 1/16in |
1-72 | 53 | 1/16in |
2-56 | 51 | |
2-64 | 50 | |
3-48 | 5/64in | |
3-56 | 46 | |
4-40 | 44 | |
4-48 | 42 | |
5-40 | 39 | |
5-44 | 38 | |
6-32 | 36 | |
6-40 | 33 | |
8-32 | 29 | 9/64 |
8-36 | 29 | 9/64 |
10-24 | 25 | 5/32 |
10-32 | 21 | 5/32 |
12-24 | 17 | |
12-28 | 15 | |
1/4-20 | 7 | 13/64 |
1/4-28 | 3 | 7/32 |
5/16-18 | F | 1/4 - 17/64 closest Match |
5/16-24 | I | 1/4 - 17/64 closest Match |
3/8-16 | 5/16 | |
3/8-24 | Q | |
7/16-14 | U | |
7/16-20 | 25/64 | |
1/2-13 | 27/64 | |
1/2-20 | 29/64 | |
9/16-12 | 31/64 | |
9/16-18 | 33-64 | |
5/8-11 | 17/32 | |
5/8-18 | 37/64 | |
3/4-10 | 21/32 | |
3/4-16 | 11/16 | |
7/8-9 | 49/64 | |
7/8-14 | 13/16 | |
1-8 | 7/8 | |
1-12 | 59/64 | |
1-14 | 15/16 | |
1-1/8—7 | 63/64 | |
1-1/8—12 | 1-3/64 | |
1-1/4—7 | 1-7/64 | |
1-1/4—12 | 1-11/64 | |
1-3/8—6 | 1-7/32 | |
1-3/8—12 | 1-19/64 | |
1-1/2—6 | 1-11/32 | |
1-1/2—12 | 1-27/64 |
Tap and Drill Size Chart (Metric)
Tap Size | Drill Bit | Drill Bit size |
|---|---|---|
M1.6 x .35 | 1.25mm | |
M2 x .4 | 1/16in | |
M2.5 x .45 | 2.05mm | |
M3 x .5 | 40 | |
M3.5 x .6 | 33 | |
M4 x .7 | 3.25mm | |
M5 x .8 | 4.2mm | |
M6 x 1 | 10 | |
m8 x 1.25 | 6.7mm | |
M10 x 1.5 | 8.4mm | |
M12 x 1.75 | 13/32in | |
M14 x 2 | 15/32in | |
M16 x 2 | 35/64in | |
M20 x 2.5 | 11/16in | |
M24 x 3 | 53/64in | |
M30 x 3.5 | 1-3/64in | |
M36 x 4 | 1-1/4in |
