... experience 1,Name: Carbon steel stamping part with black oxide coating;Carbon steel stamping part;Stamping part with balck oxide coating 2,For ... ?(1), Ability for the material of this kind of stamping part: Grade3.6,4.6,4.8,5.6,6.8 ... avoid lots of risks.P.S:For us,the most competitive industry is machined hardware fastener ,especially the cutting/turning parts ...