Where does the confusion between terms come in? In many cases, the person specifying a this type of screw will interchange the terms self-tapping screw (or “Self-Tapper”) with self-drilling screw, but a screw is only a self-drilling screw when it will drill its own hole.

Self-tapping screw in solar mounting system,either in L foot, tile hook or trapezoidal roof hook, there is the self-tapping screw.

Self-tapping screws drill their own little tunnels by cutting precise threads when they are screwed into metal.

How to drill the self-tapping screw?

You use self-tapping screws, it’s helpful, although not mandatory, to drill a pilot hole through the material. This ensures the screw will go in easily and will be positioned correctly. Make sure to use a smaller drill bit than the self-tapping screw itself when drilling the pilot hole. 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). If the screw goes in crooked, it could cause the head to strip. Next, tighten the screw until it no longer turns easily. Be careful not to over-tighten the screw because it could cause the threads to strip.

Self-tapping screws come with a sharp, piercing tip or a flat, blunt tip. The sharp-tipped screws are designed for drilling their own hole into softer materials such as wood and plastic so they don’t need a pilot hole. The advantage of the flat tipped screw is that it won’t get stuck in the material and break off. When you’re drilling into harder material such as sheet metal you need to drill a pilot hole in advance. For thicker metal, it may require more than one screw to drill through the surface.