About Pan Head (Countersunk) Machine Head Screws Pan head (countersunk) machine head screws have a flat top that tapers to a taper that can be flush with the countersunk hole and provide a full appearance. They are known for their efficient application performance and Known for their durability, they are used in a wide variety of industries such as construction, manufacturing, engineering, assembly, aircraft, and are widely used by professionals, hobbyists, landlords, repairmen and DIYers
Notice:
The length of a grub (countersunk) machine screw is measured from the top of the thread to the end of the thread, and the thread length is the total length minus the height of the head.