Prevailing torque nut


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.

  1. 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).

Mechanical properties

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.

  • Material: Carbon Steel, Stainless steel
  • Type: Hex head, all metal locking nut
  • Thread Size: M3 ~ M39
  • Surface Finish: Plain, Black Oxidated, Zinc Plating, Yellow Plating
  • Class: 4.8, 6.8, 8.8, 10.9, 12.9
  • Packing: Small box, 25kgs bulk package

Prevailing torque nuts types

DIN 980-V

Single-piece metal nuts are nuts without an insert, in which increased friction is created by the appropriate deformation of the prevailing torque element of the nut.

DIN 980-M

Two-piece metal nuts are nuts, in which increased friction is created by an additional metal element inserted in the prevailing torque nut. This type dose not have full loadability

Prevailing torque nuts material:

Carbon steel, stainless steel, copper

Prevailing torque nuts grade

4.8, 6.8, 8.8, 10.9, 12.9, A2-70, A4-80. etc.

Surface Treatment of Prevailing torque nuts

Zinc Plated, Nickel plated, Passivated, Sandblast and Anodize, Polish, Electro Painting, Black Anodize, Plain, Chrome plated, Hot Deep Galvanize(H. D. G. ) etc.