Copper MACHINE SCREW 1.ISO,ANSI,JIS,DIN,BS& non-standard fastener supply ... ,6.8,8.8,9.8... ..... Copper MACHINE SCREW, brass shoulder bolt screw ,BRASS ALLEN SCREW. A good non-standard fastenerS manufacturer for your ... steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium carbon steel ...