Need sheet metal screw 7.5*20, What else works?

[Mikael K.]

Hello!

I need to attach a sheet into a thicker sheet about 1mm and 3mm.

I need a sheet screw that is 7.5*20. (Pre-drilled hole 6.70 mm) Doesn't seem to be available that thick after googling...

What else works? Concrete screws are available in 7.5

Or should I drill new holes?

The issue arose because it was supposed to be a bolt with a nut but I can't access the back. Messed up...

 

[MultiMan]

Installing rivet nuts and screws for it? https://www.wurth.se/produkter/fastmaterial/blindnit--blindnitmuttrar

What is the load?

Edit: Sheet metal screws are available in 8x19mm: https://www.wurth.se/produkter/fast...platskruv-med-sexkantshuvud/skarmskruv-6kss2/

 

[ZipLock]

Edit: Screen screws are available in 8x19mm: [link]

Screen screws are made to be screwed into a speed nut. I can imagine that they are difficult to thread in 3 mm thick sheet metal.

Speed nut:
https://www.wurth.se/produkter/ford.../fastmaterial-fordon/platmutter/snabbmutter3/

 

[Matti_75]

Check out the gang pressing screw. You'll need to drill a bit and use M8 screw.

 

[Isakare]

We have screws similar to screen screws at 8 mm, drill 6.5 and it holds tight in 3 mm sheet metal.
Add a dab of grease or cutting paste on the screw, so it cuts better into the metal.
We use an impact driver.
The hole in the 1 mm sheet metal should preferably be enlarged to 8 mm.