Hexagon Nuts, Lock Nuts, Flange Nuts, Cap Nuts, Thumb Nuts, Square Nuts, Metric Slotted Round Nuts

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DIN980 metal locking nut type principle and mechanical properties&Introduction to all-metal lock nuts

1. Locking form 

All-metal locking nuts are also known as all-metal self-locking nuts; the primary locking forms are divided into two:

a. Relying on the nut's thread deformation position to play a locking and anti-loosening function, such nuts are collectively known as the 980-V type. Standard forms are as follows: end face three-point type, oval type, and side extrusion type.

b. Nuts embedded metal locking piece, by the locking ring to play a loosening role, such nuts are called 980-M type, standard forms are as follows:

2. Locking principle

a. The locking principle of the 980-V nut is that through the die stamping, the nut's thread is deformed by about three teeth, and the inner diameter of the nut thread after deformation is slightly smaller than the outer diameter of the bolt thread. Therefore, the friction force between the threads after tightening is much greater than that of ordinary lines, which can be influential in preventing loosening.

b. The locking principle of the 980-M nut is: the nut is embedded with a heat-treated metal sheet, the inner diameter of which is slightly smaller than the outer diameter of the bolt threads, and when the nut is tightened, the metal sheet catches the bolt threads, which can effectively play the role of anti-loosening and anti-vibration.

3. Installation method

Lock nut installation must be tightened with the help of tools (such as a ratchet), and stainless steel nuts are recommended to be pre-lubricated to prevent nut locking problems during rapid installation.

4. Use the advice

Locking nuts can be used repeatedly, but it is not recommended to frequently disassemble and install several times after repeated disassembly and installation will cause a significant drop in the nut locking torque (disassembly and installation of the fifth time to be significantly lower than the first disassembly).

5. Mechanical properties

The mechanical properties of all-metal locking nuts are the same as those of ordinary nuts, with standard grades of carbon steel generally 8, 10, and 12 and stainless steel generally 70 and 80.

Its carbon steel material nut load and hardness requirements concerning the standard implementation of ordinary carbon steel nuts can refer to the legal ISO 898-1 (carbon steel nuts mechanical properties requirements) for acceptance. Stainless steel nuts only refer to the carbon steel nut's required load-holding performance and do not require hardness.

Locking nuts need to refer to the implementation of ISO 2320 (pre-set torque locking nuts mechanical performance requirements) standard requirements of five screwing torque requirements to ensure its locking performance. Ordinary nuts do not have this particular requirement.