If the screw threads contact the surface of the metal before the hole is bored the screw will snap leaving a portion of the screw embedded in the metal.
How to sheet metal screws.
If these screws are being used the screw can merely be fitted to the drill bit and driven.
Unlike wooden rivets which are threaded only partially the above mentioned screw s shank is entirely threaded.
Self tapping screws come with a notched tip that acts as a drill bit to drive the screw and keep thin metal from denting.
Moving on to sheet metal screws and there use.
Make sure to use a smaller drill bit than the self tapping screw itself when drilling the pilot hole.
A self drilling screw has a chisel tip similar to a drill bit.
For example a screw listed as 8 32 x 1 has a diameter of size 8 contains 32 threads per inch and is one inch 2 5 cm long.
Sheet metal screw size is commonly given using a series of three numbers which represent the diameter thread count and length of each screw.
A sheet metal screw is a kind of hardware supply which is used for tightening metal objects.
This kind of fastener features a threaded shank along with a flat rounded head.
Otherwise if the hole is too large the screw threads won t have anything to attach to.
Then position the screw straight and screw it in place with a flat head or phillips screwdriver depending on the screw head.
This allows you to skip pre drilling a hole into thinner gauges of sheet metal.