Like the hole opener, the hexagonal wrench has been used until now and has become an indispensable tool in industrial manufacturing due to its unique features and advantages. Firstly, it is simple and lightweight. Due to the six contact surfaces between the hex screw and the wrench, it is not easily damaged under full force. The diameter and length of the wrench also determine its twisting force, and it can also be used to tighten screws in deep holes or very small screws. The most important point is that the cost of an Allen wrench is low and easy to manufacture, and both ends of the wrench can be used.
The origin of hex wrenches can be traced back to hex screws. Due to the high price of imported internal four corner screws by SP at that time, in order to save costs, they decided to manufacture them themselves. However, similar products manufactured by oneself are not popular in the local market, so it was decided to add hexagonal holes to the screws. Afterwards, hex screws gradually replaced hex screws as the new industry standard, widely used in manufacturing industries such as automobiles, airplanes, machinery, and furniture. And a matching hexagonal wrench has also been manufactured.