1, Hex Nut（DIN6330、DIN6334 ）- t use the most widely used, is generally one of the most common fasteners.

2 Hex Nut（DIN6330、DIN6334 ）socket head - is the most widely used of all screws, because he tightening force is relatively large, use hex wrench can be operated, the installation is very convenient, used in almost all kinds of structure, beautiful appearance and tidy, The disadvantage is that the tightening force tip below the outer hexagon, another repeated use easy to damage caused by hexagon socket can not be removed.
3, pan head Allen - rarely used machinery, mechanical properties above, are mostly used in the furniture, the main role is to increase the contact surface with the wooden material and increase the appearance of ornamental.
4, headless hex nut- must use some structure, such as a large top tight top wire force structure, or need to hide the cylinder head.
5, Hexagon Socket Countersunk Head - mostly used in power machinery, the main role with the same hexagonal
6, Hex Nylon Insert Nuts - in the hexagonal face set with nylon apron, to prevent screw loose structure, strong power machinery.
7, Hex Flange Nuts - mainly serve to increase contact with the workpiece surface, mostly used in pipes, fasteners stampings and castings.