What are the specifications and usage of the hex wrench?

Both ends of the hexagonal wrench have working ends with hexagonal holes or twelve-angle holes, which are suitable for occasions where the working space is small and ordinary wrenches cannot be used. There are inner hexagonal wrenches and outer hexagonal wrenches. The Allen wrench is a common type of wrench, which is a tool for tightening screws or nuts. Allen wrenches are used to assemble and disassemble large hexagon screws or nuts. Due to the different specifications of fasteners, there are many specifications of allen wrenches.
The main specifications of hex wrenches are 1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 17mm, 19mm, 22mm, 27mm, etc. The hexagonal wrench is simple and lightweight, easy to use, not easy to damage, and can be used at both ends.
Allen wrenches are divided into imperial and metric systems. Although the metric and imperial hex keys have different dimensional standards, they are sometimes common. When installing or removing screws, it is also difficult to distinguish whether it is a metric screw eye or an inch screw eye. And some metric and inch sizes are very similar. For example, 5/64" is approximately equal to 1.98mm, which can be said to be the same as a 2mm wrench. In addition, there are tolerances during screw manufacturing, thermal expansion and contraction caused by temperature, and rust. , So that the slight difference is no longer a difference, usually based on experience with the wrench or screwdriver at hand to try, usually does not consider the metric or imperial system.
When using a hex wrench, first insert the hex head into the hexagonal hole of the hexagon socket screw, press down with your left hand and keep the relative position of the two to prevent slipping out of the hexagonal hole when rotating, turn the wrench with your right hand to drive the hexagon socket The screws are tightened or loosened.
The hexagonal wrench is simple and lightweight. There are six contact surfaces between the hexagon socket screw and the wrench. It is fully stressed and not easily damaged. It is one of the common hand tools. Hexagonal wrenches are very popular because they can be used to tighten screws in deep holes and very small screws. They are easy to manufacture, low cost, and both ends of the wrench can be used.