... .finish:polishing, passivating,Ni-Plated,Zn-plated etc brass forging precision knurled brass nutsSpecificationsknurled nuts 1. smooth surface 2.precise dimension ... 20#,Q235 etc. Aluminum: AL6061-T6,6063-T6,AL7075 etc. Brass: C3604(C38000),C3602(36000),/Hpb59-3 etc. Plastic: POM(Delrin ... CNC lathe machineCertification:ISO9001:2008QC Control:100% Inspection before shipping brass forging precision knurled ...