zinc nut,nut bolt,lock nut Features: 1) From M6 to M30 in cold heading 2) class 4,5,6,8,10,12 etc. ISO 9001:2000 zinc nut,nut bolt,lock nutFeatures: 1) From M6 to M30 in cold heading2)class 4,5,6,8,10,12 3)Low-carbon ,mid-carbon steel,alloyNormal packing: bulking in cartons,25kgs/Carton, 36ctns/pallet. zinc hex nut