Carriage bolts with square nuts: 1) DIN603 ,ANSI,BSW,ISO, AS,JS ETC. 2) Plain,zinc,h ... .d.g.,black,stainless.Low carbon and etc. DIN603 bolts: sizesM5 and upfeatureslow carton,high tensile,stailessstandardDIN,ANSI,BSW, ... Our presence: ElectronicsHome & Industrial AppliancesIndustrial Tools and MachineriesAutomotiveMedical EquipmentsMilitaryTelecommunications Carriage bolts with square nuts