Allen wrenches are also called Allen wrenches. Common English names include Allen Key (or Allen wrench) and Hex key (or Hexwrench). It exerts the force on the screw through the torque, greatly reducing the user’s strength of force, is an indispensable tool in the industrial manufacturing industry

Hexagon socket wrench specifications are divided into metric and British two. In the use of difference is not big, but the unit of measurement is different, hexagon wrench specifications are determined according to the screw, simply said, how much screw there is how much spanner. In general, hexagon socket wrench specifications will be one grade smaller than screws.

The inner hexagon wrench has the following four measurable lengths. The opposite distance s of the section, the diagonal distance E of the section, the length L of the short side, the length L of the long side.

The key to the spread of hexagonal wrench, and become an indispensable tool in industrial manufacturing industry, lies in its own unique and many advantages:

1. It’s simple and light.

2, there are six contact surfaces between hexagon socket screw and wrench, which are fully stressed and not easy to damage.

3, can be used to screw deep holes.

4. The diameter and length of the wrench determine its torsional force.

5, can be used to turn very small screws.

6, easy to manufacture, low cost.

7. Both ends of the spanner can be used.