Drill Reference Chart

Use the reference chart below to correctly size your holes for drills and hardware.

How to use this chart

Find your drill or hardware thread size. The recommended close/free fit will be the size of your hole. Use the free size for a looser fit and close for a tight fit.

If you are countersinking, the close/free fit sizes will apply to your minor diameter.

Imperial Drill Sizes

Screw/
Thread
Size
Thread
Size
Examples
Major
Diameter
Close/Free
Fit
44-40.112″.117″ – .129″
66-32.138″.144″ – .150″
88-32.164″.169″ – .177″
1010-32.190″.196″ – .201″
1/41/4-20, 1/4-28.250″.257″ – .266″
5/165/16-18, 5/16-24.313″.323″ – .332″
3/83/8-16, 3/8-24.375″.386″ – .397″
7/167/16-14,7/16-20, 7/16-28.438″.453″ – .469″
1/21/2-13, 1/2-20, 1/2-28.500″.516″ – .533″
9/169/16-12, 9/16-18.556″.578″ – .594″
5/85/8-11, 5/8-18, 5/8-24.625″.640″ – .659″
11/1611/16-18, 11/16-24.688″.703″ – .723″
3/43/4-10, 3/4-16, 3/4-20.750″.766″ – .795″
13/1613/16-16, 13/16-20.813″.828″ – .862″
7/87/8-9, 7/8-14, 7/8-20.875″.891″ – .925″
15/1615/16-16, 15/16-20.938″.953” – .990″
11-8, 1-121.000″1.016″ – 1.1065″

Imperial Drill Sizes

Screw/
Thread
Size
Thread
Size
Examples
Major
Diameter
(MM)
Close/Free
Fit
(MM)
44-402.8452.972 – 3.277
66-323.5053.658 – 3.810
88-324.1664.293 – 4.496
1010-324.8264.978 – 5.105
1/41/4-20, 1/4-286.3506.528 – 6.756
5/165/16-18, 5/16-247.9508.204 – 8.433
3/83/8-16, 3/8-249.5259.804 – 10.084
7/167/16-14,7/16-20, 7/16-2811.11311.506 – 11.913
1/21/2-13, 1/2-20, 1/2-2812.70013.106 – 13.538
9/169/16-12, 9/16-1814.12914.684 – 15.083
5/85/8-11, 5/8-18, 5/8-2415.87516.256 – 16.739
11/1611/16-18, 11/16-2417.46317.859 – 18.364
3/43/4-10, 3/4-16, 3/4-2019.05019.446 – 20.193
13/1613/16-16, 13/16-2020.63821.034 – 21.895
7/87/8-9, 7/8-14, 7/8-2022.22522.621 – 23.495
15/1615/16-16, 15/16-2023.81324.209 – 25.146
11-8, 1-1225.40025.796 – 27.051

Hardware insertion and hole features

Countersinking

For flush surfaces, there’s countersinking. Increase the lifespan of your part and preserve your hardware from long-term wear.

Hardware Insertion

Let SendCutSend and PEM fasteners set your parts up for success with self-clinching nuts, studs, and stand-offs.

Tapping

Utilizing specialized, automated equipment, we precisely laser-cut a hole, create some threading, and send you on your way with your completed part.

Start your first SendCutSend project today!

Upload your CAD design, or try one of our customizable part templates to get instant pricing on your custom laser cut parts. All delivered to your door in a matter of days.