Parallel pins h8 ISO 2338 stainless A1 1 h8x4

The tolerance grade is indicated by numbers ranging from 1 to 18. As the number increases, the size of the tolerance zone increases. The size of the tolerance depends on the nominal dimension. The tolerance system for internal and external dimensions is standardised in accordance with DIN EN ISO 286. The tolerance zones for external dimensions are indicated by lower-case letters followed by numbers.

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".

A1: This grade of steel is specifically intended for machining. Owing to their high sulphur content, steels of this grade have lower corrosion resistance than equivalent steels with a normal sulphur content.