What size should the hole be for the press-fit stud?
2025-12-11
What should the diameter of the hole in the plate be set during the installation of the press-fit stud?
Regarding the opening dimensions of the nut post, we have compiled the following table, with specifications ranging from M3 to M6, and US standard sizes from 440 to 0420.
The so-called plate aperture refers to this size (the aperture of a thin plate):
Metric press-fit nut post hole size table:
| Thread code | Plate aperture, unit: mm + 0.08 |
| M3 | 4.2 |
| 3.5M3 | 5.4 |
| M3.5 | 5.4 |
| 6.0M4 | 6.0 |
| M4 | 7.14 |
| M5 | 7.14 |
| M6 | 8.75 |
Table of opening dimensions for American standard press-fit nut studs:
| Thread specifications | Plate aperture, unit: mm + 0.003 |
| 440 | 0.166 |
| 6440 | 0.213 |
| 632 | 0.213 |
| 8632 | 0.281 |
| 832 | 0.281 |
| 032 | 0.281 |
| 0420 | 0.344 |
It's worth mentioning the difference between M3 and 3.5M3 stud specifications. The 3.5M3 press-fit stud has a 5.4mm pilot hole, while the M3 nut stud has a 4.2mm pilot hole.
