hex socket set screws 1.Material:carbon steel,stainless steel screw 2.Finishing:zinc,black oxide 3.Standard:DIN.ANSI/ASME.JIS steel hex socket set screws ... oxide7Heat treatmentsoft, case harden, Grade4.8,6.8, 8.8, 10.9, 12.9, andso on.8StandardDIN.ANSI/ASME.JIS.BA9CertificationISO ...