Hex socket screws are used in assemblies where space is limited and tightening is done with an internal hex key. The range from SWEBOLT & BOTNIA BOLT includes screws with cylindrical, countersunk, low and domed heads. Materials cover carbon steel in strength classes 8.8, 10.9 and 12.9, stainless steel A2, A4 and A4-80, as well as special grades such as Bumax 88, Bumax 109, duplex and polyamide PA 6.6. Available with metric threads according to ISO standards and inch threads UNC and UNF according to ANSI B18.3.