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.;
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.