... : carbon steel , stainless steel , alloy steel 2. Diameter: M1~M203. Lenght: 3mm~500mm4. Finish : plain , zinc plated , black , chromate , nickel plated5. Heat treatment : HRC58-626. Standard : DIN6325 ... , DIN7979 , the samples freeinterested buyers , please tell us your specifications or send us your drawings and samples Zinc Plated Carbon steel Parallel Pins ...