Hex nut Size:M6-M64 Finish:black or zinc plated Grade:4-8-10 Material:carbon steel . Pack:carton or bag with pallet Hex nutsSize:M8-M64 standard:DIN,GB,JIS,ANSI,ASME,NON-STANDARDsurface treatment:electro-galvanized,hot dip galvanized,black,  plain colorfull,blue-whiterank:4,5,6,8,10,material:carton steel,low-carton steel,Q235 and 45#steel,35Crmopacking:carton+pallet            sack+pallet            according to customers'requirementOur company mainly produces:hex bolts,hex nuts,socket cap bolts,anchor bolts,tower bolts,dorble-headed bolts,galvanized bolts,and a variety of special bolts ,falt washers,spring washers,threaded rod

G.I hex nut M20