DIN 980 lock nuts, all metal lock nut is also known as all metal self-locking nut. There are two main locking forms:
a. This kind of nut is called 980-v type, and the common forms are as follows: end face three-point type, elliptical type, side extrusion type.
b. The nut is embedded with a metal locking plate, which can prevent loosing by the locking ring. This kind of nut is called 980-m
DIN 980 Product Details
DIN 980 Locking principle
a. The locking principle of 980-v type nut is as follows: through die stamping, the screw thread of the nut itself has about 3 teeth deformed, and after deformation, the inner diameter of the nut thread is slightly smaller than the outer diameter of the bolt thread. Therefore, the friction force between the threads after the nut is tightened is far greater than that of the common thread, which can play an effective role in preventing loosing.
b. The locking principle of 980-m nut is as follows: the nut is embedded with a metal sheet after heat treatment, the inner diameter of the metal sheet is slightly smaller than the outer diameter of the bolt thread. After the nut is tightened, the metal sheet will block the bolt thread, which can effectively play the role of anti loose and anti-seismic.
DIN 980 Installation method
The lock nut must be tightened with tools (such as ratchet spanner) during installation. It is recommended to pre coat the stainless steel nut with grease to prevent the nut from locking during rapid installation.
DIN 980 Suggestions for use
The locking nut can be used repeatedly, but it is not recommended to disassemble and install repeatedly. After many times of disassembly and installation, the locking torque of the nut will decrease significantly (the fifth disassembly is significantly lower than the first disassembly).
The mechanical performance requirements of all metal lock nuts are the same as those of ordinary nuts. The common grades of carbon steel are generally grade 8, grade 10 and grade 12, while those of stainless steel are generally grade 70 and Grade 80.
Among them, the carbon steel nut’s load retention and hardness requirements shall refer to the standard of ordinary carbon steel nut, which can refer to the standard ISO 898-1 (mechanical property requirements of carbon steel nut) for acceptance. Stainless steel nuts only refer to carbon steel nuts for load holding performance, and hardness is not required.
To ensure the locking performance, the locking nut shall refer to the torque requirements for five times of screwing in and out specified in ISO 2320 (mechanical performance requirements for pre torque locking nuts). Ordinary nuts do not have this special requirement.