Self drill screws to repair semi trailer floor

Did two trailers with the black ones.
Ended up pre drilling a hole with drill bit and went much better.
If you are using a battery powered drill have plenty of batteries charged,
Hammer drill works best on the screws.
Their is also the Bear claw decking fastener that work well in some applications.

 

I dont think the self drilling screws metal is hard enough to go thru the trailer metal,the way i did mine was using two drills with two sizes drill bits to drill a pre hole while lubricating with wd 40 to cool and preserve the sharpness of the bits,once all the holes are done i used an impact gun to drive the screws in.

 

Teks are Phillips head, so if you don't predrill the holes you're going to strip out the head. I've used them on a small bridge we have going over a drainage creek. Once the head strips out, your day just got worse.

 

The self drilling screws will dull too fast or snap. When I replaced flooring and bought like 150 of the screws they gave me 2 drill bits.

 

Use a bit just smaller than the screw head...
Dunk the screw tip in a bottle of Anti seize

 

Contact the manufacturer of the deck screws you bought for a drill bit size. You should be use'in self "Tapping" torx head screws.
One size drill bit to drill through the deck material and through the trailer steel.

 

The drill bit is just a tad smaller than the screw "shaft" ---not the screw head.