... be made of low carbon steel and high tensil spring washer sizesM5 and upfeatureslow carton,high tensile,stailessstandardDIN,ANSI, ... BSW,AS,JS,ISO,ETC.stype Flat washer and spring washerfinish bright,zinc plated,hot-dip galvanized,mechanical plated ... screws, anchors and threaded rods. Our strength: Can make custom-specific fastenersTimely reply your inquiry and doubtTimely production and deliveryWith ...