... quality iron,such as 1022,1018,1010,1008,1015...Medium carbon steel are 35k,45#,10B21,1035,CH38F,1039,40ACR...Alloy ... steel are 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304,316...copper ... years experiences in screw,bolt,nut,washer,rivet, stud, pin,wrench and so on .2.Our company had good reputation with ...