Steel 70# Rectangular Section Single Coil Spring Washers, Din 127 Type 'B', Hardness 430 - 530HV
The spring washer is widely used in the load-bearing and non-force-bearing structures of general mechanical products. It is characterized by low cost, convenient installation, and suitable for the parts with frequent installation and disassembly
Usually use 65 MN spring steel or 70 # carbon steel, 3 Cr 13, but also can use stainless steel material SUS304 or SUS316, and phosphorus bronze material.
The main function is under the nut to prevent the nut from loosening.