a) General purpose nuts: There are many varieties, such as hex nuts and square nuts. Hexagon nuts with hexagon bolts are the most common applications, and are classified into A, B, and C grades according to manufacturing precision and product quality. The hexagonal thin nut acts as a secondary nut in the lockout device, acts as a lock, or is used where the threaded connection is primarily subjected to shear forces. Hexagonal thick nuts are often used in connections that are often removed. The square nut is used with the square head bolt, the wrench is stuck and it is not easy to slip, and the multi-purpose
In a rough, simple structure. See GB41, GB6170~6177, etc.;
b) Slotted nut: mainly refers to the hex slotted nut, that is, the groove is machined above the hex nut. It is used with the screw with hole bolt and the split pin to prevent the bolt and the nut from rotating relative to each other, see GB6178～6181;
c) Lock nut: refers to the nut with locking function, nylon insert hexagon lock nut and all metal hexagon lock nut. The hexagonal nylon ring lock nut has a very reliable anti-loose ability. It has a little damage to the bolts and the connected parts and can be frequently loaded and unloaded under the use temperature of -60 to +100 ° C and certain media conditions. See GB889, GB6182~6187, etc.;
d) Special purpose nuts: such as wing nuts, cap nuts, knurled nuts and insert nuts. The wing nut can usually be disassembled without tools. It is usually used in places where it needs to be frequently disassembled and not stressed. The cap nut is used where the end screw needs a cover. See GB62, GB63, GB802, GB923, GB806, GB807, GB809, etc.