With threads according to DIN 931. Requires a torque wrench or spanner. We offer a wide range of hex head screws in various thread sizes and lengths. Details can be found in the data sheet and the series overview, which can be downloaded as a file. If high tensile steel grade 8.8 is not what you are looking for, we also offer fasteners made from stainless steel. For details, see the selection guide for fasteners. High Tensile Bolts BZP Steel - metric threads. Hex screws have a partial thread and can be used with a nut or in a threaded hole. The screws are tightened with a wrench. RS Pro's high tensile hex screws are designed to simplify assembly. Features and benefits: good corrosion resistance, recyclable, non-magnetic. Typical applications: machine repairs, outdoor use.