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.
| Screw/ Thread Size | Thread Size Examples | Major Diameter | Close/Free Fit |
|---|---|---|---|
| 4 | 4-40 | .112″ | .117″ – .129″ |
| 6 | 6-32 | .138″ | .144″ – .150″ |
| 8 | 8-32 | .164″ | .169″ – .177″ |
| 10 | 10-32 | .190″ | .196″ – .201″ |
| 1/4 | 1/4-20, 1/4-28 | .250″ | .257″ – .266″ |
| 5/16 | 5/16-18, 5/16-24 | .313″ | .323″ – .332″ |
| 3/8 | 3/8-16, 3/8-24 | .375″ | .386″ – .397″ |
| 7/16 | 7/16-14,7/16-20, 7/16-28 | .438″ | .453″ – .469″ |
| 1/2 | 1/2-13, 1/2-20, 1/2-28 | .500″ | .516″ – .533″ |
| 9/16 | 9/16-12, 9/16-18 | .556″ | .578″ – .594″ |
| 5/8 | 5/8-11, 5/8-18, 5/8-24 | .625″ | .640″ – .659″ |
| 11/16 | 11/16-18, 11/16-24 | .688″ | .703″ – .723″ |
| 3/4 | 3/4-10, 3/4-16, 3/4-20 | .750″ | .766″ – .795″ |
| 13/16 | 13/16-16, 13/16-20 | .813″ | .828″ – .862″ |
| 7/8 | 7/8-9, 7/8-14, 7/8-20 | .875″ | .891″ – .925″ |
| 15/16 | 15/16-16, 15/16-20 | .938″ | .953” – .990″ |
| 1 | 1-8, 1-12 | 1.000″ | 1.016″ – 1.1065″ |
| Screw/ Thread Size |
Thread Size Examples |
Major Diameter |
Close/Free Fit |
|---|---|---|---|
| 2 | M2x0.4 | .079″ | .087″ – .102″ |
| 3 | M2.5×0.45 | .098″ | .106″ – .122″ |
| 3 | M3x0.5, M3x0.35 | .118″ | .126″ – .142″ |
| 4 | M4x0.7, M4x0.5 | .157″ | .169″ – .189″ |
| 5 | M5x0.8, M5x0.5 | .197″ | .209″ – .228″ |
| 6 | M6x1, M6x0.75 | .236″ | .252″ – .276″ |
| 8 | M8x1.25, M8x1.00 | .315″ | .331″ – .394″ |
| 10 | M10x1.75, M10x1.5, M10x1 | .394″ | .413″ – .572″ |
| 12 | M12x1.75, M12x1.5, M12x1 | .472″ | .512″ – .591″ |
| 14 | M14x2, M14x1.5 | 551″ | .591″ – .669″ |
| 16 | M16x2, M16x1.5 | .630″ | .669″ – .748″ |
| 20 | M20x2.5, M20x1.5 | .787″ | .827″ – .945″ |
| 24 | M24x3, M24x2 | 945″ | .984″ – 1.102“ |
| Screw/ Thread Size | Thread Size Examples | Major Diameter (MM) | Close/Free Fit (MM) |
|---|---|---|---|
| 4 | 4-40 | 2.845 | 2.972 – 3.277 |
| 6 | 6-32 | 3.505 | 3.658 – 3.810 |
| 8 | 8-32 | 4.166 | 4.293 – 4.496 |
| 10 | 10-32 | 4.826 | 4.978 – 5.105 |
| 1/4 | 1/4-20, 1/4-28 | 6.350 | 6.528 – 6.756 |
| 5/16 | 5/16-18, 5/16-24 | 7.950 | 8.204 – 8.433 |
| 3/8 | 3/8-16, 3/8-24 | 9.525 | 9.804 – 10.084 |
| 7/16 | 7/16-14,7/16-20, 7/16-28 | 11.113 | 11.506 – 11.913 |
| 1/2 | 1/2-13, 1/2-20, 1/2-28 | 12.700 | 13.106 – 13.538 |
| 9/16 | 9/16-12, 9/16-18 | 14.129 | 14.684 – 15.083 |
| 5/8 | 5/8-11, 5/8-18, 5/8-24 | 15.875 | 16.256 – 16.739 |
| 11/16 | 11/16-18, 11/16-24 | 17.463 | 17.859 – 18.364 |
| 3/4 | 3/4-10, 3/4-16, 3/4-20 | 19.050 | 19.446 – 20.193 |
| 13/16 | 13/16-16, 13/16-20 | 20.638 | 21.034 – 21.895 |
| 7/8 | 7/8-9, 7/8-14, 7/8-20 | 22.225 | 22.621 – 23.495 |
| 15/16 | 15/16-16, 15/16-20 | 23.813 | 24.209 – 25.146 |
| 1 | 1-8, 1-12 | 25.400 | 25.796 – 27.051 |
| Screw/ Thread Size | Thread Size Examples | Major Diameter (MM) | Close/Free Fit (MM) |
|---|---|---|---|
| 2 | M2x0.4 | 2.0 | 2.2 – 2.6 |
| 2.5 | M2.5×0.45 | 2.5 | 2.7 – 3.1 |
| 3 | M3x0.5, M3x0.35 | 3.0 | 3.2 – 3.6 |
| 4 | M4x0.7, M4x0.5 | 4.0 | 4.3 – .4.8 |
| 5 | M5x0.8, M5x0.5 | 5.0 | 5.3 – 5.8 |
| 6 | M6x1, M6x0.75 | 6.0 | 6.4 – 7.0 |
| 8 | M8x1.25, M8x1.00 | 8.0 | 8.4 – 10.0 |
| 10 | M10x1.75, M10x1.5, M10x1 | 10.0 | 10.5 – 12.0 |
| 12 | M12x1.75, M12x1.5, M12x1 | 12.0 | 13.0 – 15.0 |
| 14 | M14x2, M14x1.5 | 14.0 | 15.0 – 17.0 |
| 16 | M16x2, M16x1.5 | 16.0 | 17.0 – 19.0 |
| 20 | M20x2.5, M20x1.5 | 20.0 | 21.0 – 24.0 |
| 24 | M24x3, M24x2 | 24.0 | 25.0 – 28.0 |
Select from our catalog of PEM press-fit hardware to add nuts, studs, and standoffs.
Quickly and easily add threading to allow for the addition of hardware to your parts.
