Slotted Countersunk Head Screws Production Process

The earliest process for wood screws was turning. However, due to the relatively large diameter of the turning process, the process was improved by the navigation mark company through testing and named the shrinking rod process. This process reduces the raw materials by 20%, and the threads are sharper and embedded When wood is used, the wood is not easy to break. At the same time, the use efficiency is improved during use and the labor cost is reduced. The head cone of the countersunk screw has a 90° taper angle. Usually the top angle of a newly purchased drill bit is 118°-120°. Some workers who lack training do not know this angle difference, and often use a 120° drill bit directly. Reaming, which causes the conical surface of the head of the countersunk screw to be difficult to tighten, but the line at the bottom of the screw head is difficult, which is also one of the reasons why the so-called countersunk screw cannot be tightened. This is not the fault of the screw.