similar to ISO 7038 | DIN standard has been withdrawn
DIN 979 | steel | 04 | bright | Cr(VI) - free | metric fine thread
Note: Similar to ISO 7038 | DIN-standard has been withdrawn | changed spanner widths for M10, M12, M14 and M22
Castle nuts are mechanical locking elements. The slot in the castle is used to insert a split through a hole in the screw and fix it in its position. This ensures that the nut will not get lost even if the preload force is lost.