DIN stands for "Deutsches Institut für Normung" which is the German institute for standardization.
DIN125 specifies the dimensions and tolerances for plain washers, including the outer diameter, inner diameter, and thickness.
The standard covers a wide range of washer sizes, from very small washers with outer diameters around 3 mm up to larger washers around 200 mm.
DIN125 washers are made from various materials including steel, stainless steel, aluminum, and plastic depending on the application needs.
These standardized washers are widely used in mechanical assemblies, construction, and other industrial applications to distribute the load under a nut or bolt head.
Adhering to the DIN125 specifications ensures compatibility and interchangeability of these common hardware components across different manufacturers and products.