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 information on the dimensions of the bolt, including the diameter, length, and thread size. It also outlines the specific requirements for the square neck and the countersunk head, ensuring proper functionality and compatibility with other components. By adhering to the DIN 604 standard, manufacturers and users can ensure the reliability and interchangeability of these bolts in their respective industries.