Socket Head

These are strongest and robust of all types of screws heads and are recognized for their durability and quality, therefore made of high grade carbon and stainless steel. These are generally found on the screws with a hex drive on the top of their head. The screws have cylindrical heads and long vertical sides. They have equal head height and shank diameter which allows them to consider at critically high strength application.
They are used where endurance is the main factor of consideration such as automotive, construction etc.