DIN 125 refers to a specific standard established by the Deutsches Institut für Normung (DIN), which outlines the dimensions and specifications for flat washers. These washers are typically used in conjunction with bolts and nuts to distribute the load of the fastener, thereby preventing damage to the surface being fastened and ensuring a secure connection. The standard provides detailed information regarding the various sizes, thicknesses, and material specifications that are acceptable for flat washers, ensuring compatibility and reliability in mechanical applications. Adhering to DIN 125 is crucial for manufacturers and engineers to maintain quality and safety in their products, as it helps to standardize components across different industries.