ALUMINUM SLEEVE NUT 1.ISO,ANSI,JIS,DIN,BS& ... 4.8 ,6.8,8.8,9.8.......... ALUMINUM SLEEVE NUT,ALUMINUM WELD NUT,NUT A good non-standard fastenerS ... ,Alloy steel,Copper,Aluminum are available.Carton steel is high quality iron,such as 1022,1018,1010,1008,1015...Medium ... brass , pure copper,such as H62,H65,H68...Aluminum is good Aluminum,R200...Meanwhile,we can use other materials accordingto customer ...