1. DIN 126 is a standard set forth by the Deutsches Institut für Normung (DIN), which outlines the specific dimensions and tolerances for slotted set screws. These screws are commonly used in mechanical assemblies where precise alignment and fastening are required. The standard details the nominal diameters, thread pitches, and slot dimensions for these screws, ensuring compatibility and consistency across various applications. Adhering to DIN 126 specifications is crucial for maintaining quality and reliability in mechanical systems, as deviations can lead to improper fitment and potential failure. Overall, DIN 126 plays a crucial role in promoting standardization and reliability in engineering practices.