12-24X2 Square Recess Wafer Head Self Drill Screw #4 Point w/Wings Full Thread Zinc (Pack Qty 2,000) BC-1232KQWAFM4W

An externally threaded fastener with a machine screw thread pitch and an extended drill point which creates its own hole. The fastener also has two reaming wings located at opposite sides of the shank, below the threads and above the drill The unified thread pitch reduces friction and driving torques. Drill screws with this style thread are normally used with thicker materials, particularly when the materials being joined are thicker than a single spaced thread pitch. The reaming wings dril Offers similar advantages as the steel screw of the same design but with better corrosion resistance. It is important to remember that the hardness of the material to be drilled should be a minimum of 10-20 Rockwell hardness points LESS than the hardness