DIN 125A, which is harmonized with ISO 7089, specifies the characteristics of flat washers of product grade A, with a nominal diameter range primarily from 1 mm to 150 mm. These washers are designed for general-purpose applications to distribute the load of a threaded fastener, such as a screw or nut, thereby preventing damage to the surface being fastened and reducing the risk of loosening due to vibration. Manufactured from a variety of materials, including but not limited to steel, stainless steel, and non-ferrous metals, these washers are a fundamental component in a wide array of mechanical assemblies. The standard ensures compatibility and interchangeability by defining precise dimensions, tolerances, and material properties. This facilitates their universal application across various industries, including automotive, construction, and machinery manufacturing, making them indispensable in ensuring structural integrity and operational reliability.