Quenched and tempered medium carbon steel with Class 8.8 strength. The hexagon socket head cap screw features a cylindrical socket head that can be recessed to reduce external protrusion. Black oxide finish provides a matte black appearance and basic corrosion resistance suitable for dry indoor environments. Standards referenced: DIN 912, GB/T 70.1-2008 and ISO 4762.

Class 8.8 hardness is intended to provide the tensile and compression resistance required in assembly applications such as molds, automation equipment, machine tools and precision machinery. Please confirm required sizes, thread length and any additional finish or tolerance requirements when ordering.