====== Various dimensions of Hardware I often use in 3D printed Projects ======
This is going to be a collection of various dimensions I often use in my CAD Projects for 3D Printing.. I've spent way too much time looking at old projects to look up what dimensions worked best for screw holes etc., so i finally started to list them here. All measurements are **in millimeters** unless otherwise stated

====== Screws ======
^ Type ^ nominal diameter ^ Diameter with clearance ^ Diameter to screw into ^ Head diameter ^
| Counter sunk Wood Screw | 3 | 3.5 | 2.5 | 6 |
|  | 2.5 | 2.8 | 2 | 5 |
| Counter sunk Metal Screw | M4 | 4.3 | tbd | 8 |
|  | M6 | 6.3 | tbd | 12 |
|  | M3 | 3.3 | tbd | 6 |
|  | M2 | 2.8 | 1.7 | 3.8 | 
| Flat Head Metal Screw | UNC 4-40 | 3.0 | tbd | 5 |
|  | M3 | 3.3 | tbd | 6 (head height: 3mm) |
====== Nuts ======
**tight** and **loose** are the circumscribed Polygon radius for a tight fit, where the Nut needs to be pulled in and will stay in, or loose, where it is easy to slide the nut in and out. 
^ Nominal Size ^ tight ^ loose ^ Thickness ^
| M3 | 2.8 | 2.9 | 2.5 | 
| M4 | 3.45 | 3.6 | 3 |
| M5 | 3.95 | 4.2 | 4 (nylock: 5 ) |
| M6 | 4.9 | 5.2 | 5 |
| UNC 4-40 | 2.5 | x | 1.9 |

====== Hole Drill Size for inner Threads ======
For more dimensions see [[https://schraube-mutter.de/bohrtabelle-fuer-metrisches-iso-gewinde/|Source]]
^ Screw Size ^ Thread spacing ^ drill size ^
^ M1 | 0,25 mm | 0,75 mm |
^ M2 | 0,40 mm | 1,60 mm |
^ M3 | 0,50 mm | 2,50 mm |
^ M4 | 0,70 mm | 3,30 mm |
^ M5 | 0,80 mm | 4,20 mm |
^ M6 | 1,00 mm | 5,00 mm |
^ M7 | 1,00 mm | 6,00 mm |
^ M8 | 1,25 mm | 6,80 mm |
^ M9 | 1,25 mm | 7,80 mm |
^ M10 | 1,50 mm | 8,50 mm |
^ M12 | 1,75 mm | 10,50 mm |
^ M14 | 2,00 mm | 12,00 mm |
^ M16 | 2,00 mm | 14,00 mm |