That makes total sense, doesn’t it? Apparently, for one nation and some other small country on this boulder we live on, it does.
So I needed a small mounting bolt for my american made, weapon. Silly me assumed that this was standard thread that everyone is using, but no. Eventually, after a lot of measuring, I figured out that the cut of the thread was Whitworth G40-1/8 and the estimated width of the bolt was 4,20mm and the length was 3,18mm. After a long search, I now know that i need to search for the following bolt:
#8-40 x 1/8
- #8 means that the gauge is 0.164 in. or 4.17 mm
- 40 stands for the threads per inch, in this case classified as “fine”.
TPI 40 = 0,025″ Pitch in Inches or 0,635 Pitch in Millimeter. - 1/8 stands for the length of the bolt. (Actual size 0.1255″ or 3.1877mm)
So I just ordered #8-40 x 1/4 because I need longer bolts. And I was unable to find them here in The Netherlands. So AliExpress came to the rescue!
| Self Tapping Screw Gauge (g) | Size (mm) |
|---|---|
| 4 | 2.9 |
| 6 | 3.5 |
| 8 | 4.2 |
| 10 | 4.8 |
| 12 | 5.5 |
| 14 | 6.3 |
| 18 | 8.0 |
