Attention: The DIN 980 standard has been officially withdrawn and replaced by DIN EN ISO 7042:2013-04 and DIN EN ISO 10513:2013-05. EV Group China specialists recommend using the current versions of the standards when designing new assemblies.
Technical requirements and scope of DIN 980
This regulatory document defines the design parameters for all-metal hexagon nuts with a prevailing torque (self-locking) function. The design of the products ensures secure fastening of the threaded connection, eliminating the risk of spontaneous loosening under the influence of vibration or shock loads. The standard covers metric threads with nominal diameters ranging from 3 to 39 mm. The fasteners are divided into two accuracy classes: class A (for products with a nominal diameter up to 16 mm) and class B (for fasteners with a diameter over 16 mm).
Classification of self-locking nuts
Self-locking hexagon nuts are high-performance hardware that ensures stable tension in the joint due to friction forces. The locking effect is achieved through the specific geometry of the clamping section, which creates the necessary radial or axial stress on the thread turns.
All-metal single-element nuts are fasteners in which the locking effect is implemented directly within the nut body through deformation or special profiling of the clamping part.
Two-element metal nuts are products consisting of a main body and an additional metal element integrated into the structure to create increased frictional resistance. This type of fastener has limited load-bearing capacity under extreme operating loads.