Hex socket screws

Hex socket screws provide reliable and durable fastening solutions suitable for a wide range of applications. Their precisely designed cylindrical head (DIN 912), countersunk head (ISO 10642), and button head (ISO 7380) allow for versatile use and installation even in demanding conditions, making them an excellent choice especially for machine assembly, fastening components in engine assemblies, and industrial equipment assembly in general. Made from durable materials such as carbon steel, stainless steel, acid-resistant steel, and specialty materials, hex socket screws meet strict DIN and ISO quality standards and ensure a secure connection in all projects.
Cylindrical head hex socket screws (DIN 912) are used especially in screw joints that require recessed installation, where the screw head remains hidden in a recess. The head diameter of a cylindrical head hex socket screw is narrower than that of a standard hex head screw (so-called nut head), making it better suited for tight spaces and assemblies with precise dimensional requirements. A low-head version (DIN 7984) is also available for the cylindrical head type, expanding the product’s usability in different assemblies.
Other head styles include the countersunk head (ISO 10642), which sits flush with the installation surface, and the button head (ISO 7380), which has a low profile and is used in applications requiring both aesthetics and strength.

Materials and coatings
Steel
Use: A commonly used material that offers good strength and durability.
Coatings:

Zinc plating (standard zinc-plated hex socket screws) provides rust protection, but is not as durable as stainless steel.
Black passivated steel provides additional corrosion protection.
Stainless steel (A2 / A4)
Use: Suitable for environments where rust is a concern (e.g. outdoor use, proximity to seawater).
Coatings: Stainless steel generally does not require additional coatings.
A2 is the most common, but A4 (acid-resistant steel) is especially suitable for demanding environments, such as in the chemical industry.
Acid-resistant steel (A4)
Use: Especially resistant to corrosion and high temperatures, making it suitable for demanding industrial environments.
Coatings: Additional coatings are generally not needed, as it is highly durable on its own.