Socket head screws are often used in machinery, mainly for easy fastening and disassembly, and not easy to slip corners. Allen wrenches are generally in the shape of a curved square with a 90° turn. The bent end is long and the other is short. When the short side is used to screw the screw, the long side can save a lot of force and can better tighten the screw. The long end is divided into a round head (a hexagonal cylinder is similar to a sphere) and a flat head. The round head can be easily slanted in and removed to install some parts that are inconvenient for the wrench to be installed. The manufacturing cost of the outer hexagonal screw is much lower than that of the inner hexagon. It also has the screw head (the force position of the wrench) is thinner than the inner hexagon. In some places, the inner hexagon can not be replaced. In addition, machines with low cost, low power strength, and low precision require much less socket head screws than external hexagons.
Hexagon socket bolts have more than many types of national standards, but there must be certain, they are all hexagon sockets. According to the head classification of hexagon socket bolts, there are cylindrical head hexagon socket bolts. This is commonly used, and there are many types of it. According to the material, there are iron, that is, carbon steel and stainless steel. Stainless steel hexagon socket bolts are also made of stainless steel SUS304 and SUS202. Hexagon socket head bolts with round head, this is also called pan head hexagon socket bolt. The countersunk head hexagon socket bolt has a flat head and a hexagon socket inside.
Hexagonal screws are common hexagonal screws with hexagonal heads. The manufacturing cost of the outer hexagonal screw is much lower than that of the inner hexagon. It also has the screw head (the position where the wrench is stressed) is thinner than the inner hexagon, and in some places it cannot be replaced by the inner hexagon. In addition, machines with low cost, low power strength and low precision requirements use fewer hexagonal socket screws than external hexagonal screws.
The difference between Socket head screws and Socket head screws is that the head of the socket head screw is hexagonal prism with a small height; the head of the socket head screw is cylindrical with a hexagonal hole in the middle, and screws of the same diameter The head of the hexagon socket screw should be thicker. The two types of screws are assembled and disassembled using different tools (common wrench and hex wrench). The load-bearing capacity of the two screws of the same material and the same rib are the same. They are mainly selected according to the requirements of the installation position on the screw head accommodation, for example, Where countersunk screws are used, it is much more convenient to use Socket head screws for tightening, but the depth of the counterbore that needs to accommodate the screw head is much larger, and a special Allen wrench is required, which can deal with different sizes than ordinary adjustable wrenches. The external hexagonal screw is troublesome; therefore, it is necessary to choose the hexagonal head or the internal hexagonal head according to the specific situation.
