Thick nut ISO9001:2008 Grade :4.8,5.8,6. ... black,zinc Certificate:ISO9001:2008 Specification Long Thick nut ISO9001:2008 Size of nut:M3~M64 Materail :carbon steel Certificate : ... ,zincWe are a manufacturer specialized producing kinds of bolt and nut.Main products :hex blot(GB5782 GB5783 DIN931 DIN933),hex ... cap screws(GB70 GB71 DIN912),Flange bolt,Flange nut,hex nut(GB6170 GB6171 GB1229 DIN934),Thick ...