Technical resources
Drilling holes for selftapping screws
Drilling holes for seftapping screws depend of the diameter of the screw, the kind of material the screw is turned in and the thickness of the material the screw is turened in . There may be quite big deviations depending on how the hole is produced (drilled, punched etc.?) Deviations in quality and tolerances on the material may be a reason to use different diameters of drilling holes . Finally the paractical tests will have to make you decide what dimensions will give you the best results.. The mentioned diameters are only advising dimensions.
| thread diameter | thickness of material | drilling hole in sheet of steel | drilling hole in sheet of aluminium |
|---|---|---|---|
| 2,2 | 0,0 - 0,56 | 1,6 | - |
| 0,56 - 0,75 | 1,7 | 1,6 | |
| 0,75 - 0,88 | 1,8 | 1,6 | |
| 0,88 - 1,13 | 1,85 | 1,6 | |
| 1,13 - 1,38 | 1,85 | 1,7 | |
| 1,38 - 1,5 | 1,9 | 1,8 | |
| 2,9 | 0,0 - 0,56 | 2,2 | - |
| 0,56 - 0,63 | 2,25 | - | |
| 0,63 - 0,75 | 2,25 | 2,2 | |
| 0,75 - 1,38 | 2,4 | 2,2 | |
| 1,38 - 1,75 | 2,5 | 2,25 | |
| 1,75 - 2,5 | 2,6 | 2,4 | |
| 3,5 | 0,0 - 0,56 | 2,6 | - |
| 0,56 - 0,75 | 2,7 | - | |
| 0,75 - 0,88 | 2,7 | 2,65 | |
| 0,88 - 1,38 | 2,8 | 2,65 | |
| 1,38 - 1,75 | 2,9 | 2,75 | |
| 1,75 - 2,5 | 3,0 | 2,85 | |
| 2,5 - 3,0 | 3,2 | 3,0 | |
| 3,0 - 6,0 | - | 3,0 | |
| 4,2 | 0,0 - 0,5 | - | - |
| 0,5 - 0,63 | 3,2 | - | |
| 0,63 - 0,88 | 3,2 | 2,95 | |
| 0,88 - 1,13 | 3,2 | 3,0 | |
| 1,13 - 1,38 | 3,3 | 3,2 | |
| 1,38 - 2,5 | 3,5 | 3,5 | |
| 2,5 - 3,0 | 3,8 | 3,7 | |
| 3,0 - 3,5 | 3,9 | 3,8 | |
| 3,5 - 10 | - | 3,9 | |
| 4,8 | 0,0 - 0,5 | - | - |
| 0,5 - 0,75 | 3,7 | - | |
| 0,75 - 1,13 | 3,7 | 3,7 | |
| 1,13 - 1,75 | 3,9 | 3,7 | |
| 1,75 - 2,5 | 4,0 | 3,8 | |
| 2,5 - 3,0 | 4,1 | 3,8 | |
| 3,0 - 3,5 | 4,3 | 3,9 | |
| 3,5 - 4,0 | 4,4 | 3,9 | |
| 4,0 - 4,75 | 4,4 | 4,0 | |
| 4,75 - 10 | - | 4,2 | |
| 5,5 | 0,0 - 1,13 | 4,2 | - |
| 1,13 - 1,5 | 4,3 | 4,1 | |
| 1,5 - 1,75 | 4,5 | 4,2 | |
| 1,75 - 2,25 | 4,6 | 4,4 | |
| 2,25 - 3,0 | 4,7 | 4,6 | |
| 3,0 - 3,5 | 5,0 | 4,6 | |
| 3,5 - 4,0 | 5,0 | 4,8 | |
| 4,0 - 4,75 | 5,1 | 4,8 | |
| 4,75 - 10 | - | 4,9 |