Cylinder screws hexagon socket partial threaded ISO 4762-D6-100 Duplex M16x90 mm

Stainless steel refers to alloyed or unalloyed steels that contain at least 10.5% chromium and less than 1.2% carbon. Colloquially, stainless steel is also referred to as stainless steel (NiRo), although not all stainless steel is the same as "stainless".

The term plain indicates a completely untreated, merely oiled, smooth surface for all DIN and ISO screws such as wood screws, hexagon head screws, threaded rods, nuts and many types of washers.

Compared with a Phillips-head screw of the same size, a hex socket screw can withstand around ten times the torque. Hex socket screws are well suited to bolted joints where the screw heads are difficult to access due to the design of the structure. Hex socket screws can be countersunk to save space if protruding screw heads are a problem.

Steel screws with underhead ribs: These have a minimum tensile strength of 1000 N/mm² and are case-hardened (surface hardness of at least 550 HV) to ensure that the ribs or locking teeth can fulfil their function. This is a key difference from standard screws in accordance with DIN 6921. Stainless steel screws and nuts: The stainless steel nuts and screws are available in the following strength classes: (50), 70, 80 and 100.