Crown nut these are nuts that are used on various types of axles and shafts, where there are vibration and dynamic loads. Holes are drilled in these axles, in which, after tightening the nut, cotter pins are inserted, which in turn pass through the vertical slots in the nut. This allows you to securely lock the nut and prevents it from unscrewing when vibrating.
Scope DIN 935 is used in mechanical engineering, construction.
Material Stainless Steel. Strength class A4 allows the use of bolts at significant temperature differences and in aggressive and humid environments.
No coating.
Analogs GOST 5918-73. GOST 5932-73. ISO 7035