DIN 604 is a standard that specifies the dimensions and technical requirements for flat countersunk square neck bolts. These bolts are commonly used in various applications where a secure and flush fit is required. The standard provides detailed guidelines for the dimensions of the bolt, including the diameter, length, and thread pitch. It also outlines the requirements for the material, surface finish, and mechanical properties of the bolt. By adhering to the specifications outlined in DIN 604, manufacturers can ensure the quality and compatibility of these bolts, making them reliable and suitable for a wide range of industrial and construction purposes.