DIN 558 Full Thread Hexagon Screws and Bolts - ISO 4018 Hex Head Screws, Product Class C

Fully threaded hexagonal screws and bolts, as defined in the DIN 558 standard published by the German Institute for Standardization (DIN), have threads that extend along the entire length of the shaft from the face under the head to the tip. Fully threaded screws and bolts are frequently used in assemblies where gripping force is a critical characteristic, as there is a greater number of threads and surface area in contact with the assembled parts. Typically, a fully threaded bolt is tightened into a fully threaded hole in the assembled parts. Because the bolt is fully threaded, gripping is applied along the entire length of the bolt. Once fully tightened, the holding pressure generated at the head where it engages with the assembly is significant and strongly resists loosening.

Similarly, the ISO 4018 standard published by the International Standards Organization (ISO) describes the properties of hex head screws with threads from M5 to M64, product class C (ISO 4018 Hex head screws - Product class C). This product type is identical to screws covered by the ISO 4016 standard, except for head threading. 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.

The ISO 4018 standard belongs to a group of product standards developed by ISO on hex drive fasteners. This product group includes:

• hex head bolts
• hex head screws
• hex nuts
• flanged hex bolts
• flanged hex nuts

Requirements for hex head screws are included in the DIN 558 standard under the following headings:

• Mechanical properties of stainless steel for hex head screws
• Chemical composition of stainless steel for hex head screws
• Mechanical properties of steel for hex head screws
• Chemical composition of steel for hex head screws

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, provides hex head screws for fully threaded hexagonal screws and bolts within the scope of DIN 558 standard and within the scope of ISO 4018 standard. (product class C) also provides testing services.