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.

characteristic

Q235 wire is commonly used for hex screws, and of course, iron screw wire is also used. The wire used for these screws can determine some of the characteristics of hex screws.

The first one is that the hardness of stainless steel screws is relatively high, but if it is made of iron, the hardness is significantly worse, which is related to the wire of the iron itself. The texture of iron itself belongs to a relatively soft category, which cannot be compared to stainless steel wire. However, in order to achieve the required hardness for iron screws, heat treatment is generally used to harden them. During the heat treatment process, it is necessary to ensure that the screws are uniformly heated. Otherwise, not only will the hardness of the screws not meet the requirements, but it will also make them easy to bend, greatly increasing the production cost of hexagonal screws. After heat treatment, it is possible to increase the hardness of iron hexagonal screws, but due to wire issues, it is still not possible to compare the quality with stainless steel wire.

One thing to note for hex screws is to try not to let the screw head slip during use, otherwise it will be difficult to remove the screw in the future.