DIN 933 and ISO 4017 refer to a specific set of international standards governing the dimensions, material specifications, and mechanical properties of hexagon head screws. These standards ensure uniformity, reliability, and compatibility across a wide range of engineering and construction applications. The designation DIN 933 originally comes from the German standards system (Deutsches Institut für Normung), indicating a fully threaded hexagon head screw. Meanwhile, ISO 4017 is its counterpart under the International Organization for Standardization, highlighting the global acceptance and applicability of this specification. These standards specify parameters such as thread size, pitch, length, and the materials from which the screws should be made, including various grades of steel and stainless steel. By adhering to these specifications, manufacturers and users can ensure that these fasteners provide the necessary mechanical strength, corrosion resistance, and durability required for their intended applications.