Grade: 4.8, 8.8, 10.9, 12.9, Material: Q235, 35K, 45K, 40Cr, 20Mn Tib, 35Crmo, 42Crmo, Surface Treatment: Blackened, Electrogalvanized, Dacromet, Hot-dip Galvanized, Galvanized, etc!
Internal hexagonal screws are commonly used in machinery, with the main advantages of being easy to tighten, disassemble, and less prone to slipping. Internal hexagonal wrenches are usually bent at a 90 ° angle, with one end long and the other short. When using the shorter end to tighten screws, holding the longer end can save a lot of force and better tighten the screws. The longer end has a round head (a hexagonal cylinder similar to a sphere) and a flat head, which can be easily inserted into the screw hole for easy disassembly. The manufacturing cost of the external hexagonal wrench is much lower than that of the internal hexagonal wrench. Its advantage is that the screw head (the position where the wrench is subjected to force) is thinner than the internal hexagonal wrench, and some places cannot be replaced by the internal hexagonal wrench. Machines with low cost, low power intensity, and low precision requirements use much fewer internal hexagonal screws than external hexagonal screws.