DIN 125 is a standard that specifies the dimensions, materials, and technical delivery conditions for plain washers used in general engineering applications. These washers are designed to distribute the load of a threaded fastener, such as a screw or nut, and to reduce wear and deformation.Washers can be supplied with various surface finishes to enhance corrosion resistance or appearance. Common finishes include plain (oiled), zinc-plated, hot-dip galvanized, or black oxide.