
The DIN 601 standard published by the German Institute for Standardization (DIN) describes the requirements for hex head bolts with threads from M5 to M52.

Similarly, the ISO 4016 standard published by the International Standards Organization (ISO) describes the characteristics of hex head bolts with threads from M5 to M64, product class C (ISO 4016 Hex head bolts - Product class C). In special cases, if specifications other than those listed in this standard are required, international standards such as ISO 724, ISO 888, ISO 898-1, ISO 965-1 and ISO 4759-1 should be followed.
Requirements for hex head bolts are included in the DIN 601 standard under the following headings:
Hex head screws are hex head screws that can be tightened with a wrench or socket. Such tools merge with the outer faces of the hexagonal head. Hex heads always have an external hex head. A screw is a mechanical fastener with a threaded shaft that screws directly into a part. The term hex head generally refers to a machine screw with a preformed machine thread. Machine screws are similar to bolts but have a threaded shaft. Some hex head screws have slotted screws along with standard hex head screws so a screwdriver can be used instead of a wrench or socket.
The ISO 4016 standard belongs to a group of product standards developed by ISO on hex drive fasteners. This product group includes:
Among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, our organization, with its trained and expert staff and advanced technological equipment, within the scope of DIN 601 standard, for M5 to M52 hex head bolts (product class C) and ISO 4016 standard. It also provides testing services for hex head bolts (product class C).
