What's the difference between hexagon screws and inner hexagon screws?

Hex screws and inner hex screws are one of the fasteners, what's the difference?Hexagonal bolts are round on the outside and concave hexagonal on the middle, and hexagonal screws are the regular hexagonal sides of the heads.

The hexagonal screwdriver looks like "7", which is made by cutting and bending the hexagonal steel bar at both ends to form an inner hexagonal spanner, while the outer hexagonal screw is the hexagonal screw with more hexagonal edges on the head.

The biggest differences are:

Hexagon screws are often used in machinery, mainly for fastening, disassembly, not easy slip Angle and other advantages.Allen wrench is usually a square shape, 90 ° bend bend at one end of the long and short, with a short side of the screw, holding a long side can save a lot of strength and better tighten screw.The long end is divided into a round head (hexagonal cylinder is similar to a ball) and a flat head, which can be easily obliquely disassembled.The manufacturing cost of the outer hexagon screw is much lower than that of the inner hexagon, and its advantage is that the screw head (the spanner position) is thinner than the inner hexagon, which can not be replaced in some places.In addition, low cost, low dynamic strength, low precision requirements of the machine used hexagonal screws more than hexagon less.

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