Screw fastening element for agricultural machines e.g. field sprayers and fertilizer distributor, comprises a corrosion protection coating layer, which is applied on the fastening element by nitro-oxidative treatment

摘要

The screw fastening element (2) comprises a corrosion protection coating layer, which is applied on the fastening element by nitro-oxidative treatment. A steel material with a higher quality finish is used to achieve the good surface hardness of the fastening element and the good quality without nitrocarburizing of the fastening elements. The screw fastening elements are screws, fitting collets and nuts (3) and/or threaded member of a hydraulic passage.