Copper MACHINE SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener supply 2.ROHS is capable 3.Grade:4.8 ,6.8,8 ... .8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non ... 35k,45#,10B21,1035,CH38F,1039,40ACR...Alloy steel are 35,40CrMo,SCM435,10B38...Stainless steel is SS201,202,302,304 ...