Are these self drilling screws for metal?

[Homervanderjazz]

Thanks

 

[JohnD]

yes

but they will go rusty and leave an annoying stain on the numberplate and a jagged hole in the car.

I'd use stainless but better, glue or the adhesive tapes/pads.

 

[Burnerman]

They are self tapping screws, not self drilling......you'll need a small pilot hole for the screws to start, and then they cut their own thread.
John

 

[SammyInnit]

No. You'll need to pilot metal first for these. Sell drilling for metal have a split point.

 

[Homervanderjazz]

No. You'll need to pilot metal first for these. Sell drilling for metal have a split point.

Which would be best to use? Would the hole be bigger

They are self tapping screws, not self drilling......you'll need a small pilot hole for the screws to start, and then they cut their own thread.
John

whay size pilot hole would you use? I.e. what size drill bit? Thanks

 

[Homervanderjazz]

No. You'll need to pilot metal first for these. Sell drilling for metal have a split point.

Thanks- what size pilot hole would you drill? Thanks

 

[SammyInnit]

Thanks- what size pilot hole would you drill? Thanks

1-2mm smaller than the screw diameter. Depends how soft the metal is. Personally I'd use self drilling screws and save myself the trouble.

 

[Doggit]

You use a drill that's the diameter of the screws shank, but not only will the screws rust, but the car body will also rust where you drill the hole.

 

[Burnerman]

For typical number plate screws, use a 3mm drill. Drill into the plastic bumper if you can, but if you have to go through steel then add a blob of grease to prevent corrosion.
Most number plates are secured with sticky pads these days.
John