Countersunk head hexagon socket screws, also known as flat cup hexagon socket screws, are common in British and metric systems, and the commonly used materials are stainless steel and carbon steel. The screw head is round on the outside and hexagonal in the middle. Its head is a 90-degree cone. After installation, the screw head can be matched with the mounting surface to keep the mounting surface flat.
Countersunk hexagon socket screws are often used in machinery, mainly for fastening, disassembly, not easy to slip Angle and other advantages. Hexagonal wrench is generally "L" type, one end is long and the other side is short. When using the short side to turn the screw, hold the long side can save a lot of force and play a good fastening role.
Countersunk head hexagon socket screw is mostly used in the need to install, the surface of the parts can not have concave place, fastener parts and there are two kinds of thickness, the so-called thick, that is to say, the thickness of the fastening parts is greater than the thickness of the countersunk head hexagon socket screw head, after the screw tighten, there is still a part of the thread does not enter the thread hole. Countersunk hexagon socket screws can be tightened in this case. There is usually another case, that is, the thickness of the fastening parts is less than the high plating of the countersunk head hexagon socket screw head, which is common in sheet metal parts in mechanical equipment, such as the hinge of the case and the connection between the door and the box.
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