Tips for screwing into car body.

**SwapMeet** · 03-03-2005, 02:51 PM

Before I start drilling holes into my car's trunk for attachment points for my sub and amp, as well as making a nice hole for my battery cable in my firewall, just wanted to get some tips from you guys.

-Is there a better way besides trial and error to determine which drill bit to match with a certain type of screw? I have screws labeled #8, which drill bit does that correspond to?
-I've got some metal screws from Home Depot, will these work?
-What's the deal with self-tapping screws? I hear about them all the time on car audio sites. Where do I find them and how do I use them?
-Any other tips that will help me not drill through a fuel line.

**mpattonm** · 03-03-2005, 02:58 PM

I have got one: do not drill through cables conecting your airbags.

**Dudes99** · 03-03-2005, 03:03 PM

Try here it's basically a drill and tap guide. Same rules apply for screws. Look at the guide and a #8 tap would use a #29 drill for the hole......

**Dudes99** · 03-03-2005, 03:05 PM

oh and use COMMON SENSE and check behind what you are drilling in to!!!!

**MatrixPC** · 03-03-2005, 03:08 PM

Oh yeah, you better watchout for that time bomb (fuel tank).

**xdjxklusivex** · 03-03-2005, 05:35 PM

i agree with dudes99 and matrix pc lol commen sence is a good thing :-D ive seen guys tape over the location they drill through so it will be smooth... i do it it works good :-D... just watch out for flying metal going into ur eyes... happend to my friend drilling through a screw head on our dj rack his eye was bleeding not a pritty sight :-P

**silencery** · 03-03-2005, 09:36 PM

wear goggles and drill pilot holes with good bits.

**GRUNT** · 03-03-2005, 09:45 PM

Any hole you drill in your car, I suggest you apply some waxoil to the hole.
Helps prevent rust.
If you are drilling a hole greater than say 8mm always drill pilot holes,
if you are wanting a nice 13mm hole i would drill a 5mm then 8-9mm then the 13mm. this will make a nice round hole.