Trilo / Taptite & HexaLobular  screws from Rolling thread process with heat treatment

Machine screw with metric coarse thread and trilobular configuration. 

When threading into the substrate, the trilobular shape of the thread work hardens the substrate creating a smooth grain flow within the metal. This lowers the drive torque required for insertion and minimizes loosening caused by vibration. It also eliminates the formation of chips during insertion. 

Since these screws form mating threads, it eliminates the need for tapping resulting in huge saving in terms of money and time. Moreover, there is even no need for locking washers.