Self-Drilling Hex Head Screw

Self-drilling hexagon head screws with a collar have a drill point that cuts its own hole. The collar sits under the head and can act as a washer.

A self-drilling hex head screw drills its own hole and forms a thread in one operation. It is used to join metal sheets and profiles to a supporting frame. It often has a collar or washer under the head to spread the load.

This kind of screw is often made in steel. The material can affect corrosion resistance and strength.

This is a general guide to checking this kind of part. It says nothing about any supplier's parts.

Ask for a certificate of conformance. On receipt, check the drill point, thread condition and that the collar is present and secure.