Carriage bolts with square nuts: 1) DIN603 ,ANSI,BSW,ISO, AS,JS ETC. 2) Plain,zinc,h.d.g.,black,stainless ... -dip galvanized,mechanical plated ,nickel plated,blackgrades4.8,5.8,6.8,8.8,10.9,12.9widely using forindustris,constructions,electrical ... ElectronicsHome & Industrial AppliancesIndustrial Tools and MachineriesAutomotiveMedical EquipmentsMilitaryTelecommunications Carriage bolts with square nuts