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Hex bolts and hex screws

Hexagonal head screws and large hexagonal bolts, as the name suggests, are externally threaded fasteners with a hexagonal head, designed to be turned with a wrench. According to the ASME B18.2.1 standard, hexagonal head screws have a smaller tolerance for head height and stem length compared to general large hexagonal bolts. Therefore, ASME B18.2.1 hexagonal head screws are suitable for installation in all areas where hexagonal bolts can be used, as well as in areas where large hexagonal bolts are too large to be used.

The outer edge of the screw head of an internal hexagonal screw is circular, and the middle is a concave hexagonal shape, while a hexagonal screw is the commonly seen type of screw head with hexagonal edges. The hexagonal screwdriver looks like a ’7′, which is made by cutting two sections of hexagonal steel bars and bending them to 90 degrees to create a hexagonal screwdriver wrench. It is sold in hardware tool stores.

The hexagonal screwdriver is not a so-called “mobile phone specific screwdriver”. Mobile phone specific screwdrivers can be purchased from repair tool stalls in the electronic market.

Hexagonal screws are commonly used in machinery, with the main advantages of being easy to tighten, disassemble, and not prone to slipping. Hexagonal wrenches are usually bent at a 90 ° angle, with one end long and the other short. When using the short end to screw, holding the long end can save a lot of effort and better tighten the screw. The long end has a split round head (a hexagonal cylinder resembling a sphere) and a flat head, which can be easily angled for disassembly and installation in certain areas where it is not convenient to lower the wrench. The manufacturing cost of the outer hexagon is much lower than that of the inner hexagon, and its advantage is that the screw head (where the wrench is subjected to force) 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 intensity, and low precision requirements use much fewer internal hexagonal screws than external hexagonal screws

Hexagonal socket head screws, also known as socket head screws or Allen bolts, are screws with a hexagonal inner hole on the head that can only be tightened or loosened after inserting a hexagonal ruler into the inner hole. The most commonly used hexagon socket head screws are cylindrical head screws, with a head diameter of approximately 1.5 times the main diameter of the thread (1960 series). Other head types include half round head screws that make the surface aesthetically pleasing and flat head screws suitable for conical screw holes. The counterbore design allows the screw head to rotate even without being exposed to the surface of the fixed object, so it is often used in areas with small surfaces that are inconvenient for traditional wrenches to use.


Post time: May-19-2023