Spring discs domed DIN 137 form A-stainless A2-1.4310 3,7

The material 1.4310 is an austenitic chrome-nickel steel with good formability. Due to its special mechanical properties, this material is the classic representative of stainless spring steels and is mainly used in the production of corrosion-resistant spring components. The material designation is X10CrNi18-8, X12CrNi177.

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.

Steel grade A1 is specifically intended for machining. Due to the high sulfur content, the steels of this type of steel have a lower corrosion resistance than corresponding steels with a normal sulfur content.