Description:1. Material: Made of 10.9 grade carbon steel, black oxide coating finish, high strength, wear-resistant, anti-corrosion.2. Application: It is widely used in the assembly and maintenance of households, machine tools, construction, and DIY project. Such as the assembly and fixing of guardrails, home appliances, pipeline installations, equipment, steel-framed houses, etc.3. Design: There is a circular serrated flange under the head of the flange bolt, which acts as a gasket and has the function of distributing load and preventing loosening.4. Installation: A wrench is required for installation. Generally, with a hex nut to form a fastener device(Not in the package). It can also be used alone in components with a pre-threaded hole.Specification:Product Name: Hex Flange BoltsMaterial: Carbon SteelFinish: Black Oxide CoatingPerformance Grade: 10.9Thread Type: Fully ThreadDimension: M12 x 40mmRod Length(Under Head): 40mm / 1.57"Pitch: 1.75mm / 0.069"Flange Diameter: 26.6mm / 1.05"Hex Width: 18mm / 0.71"Hex Thickness: 10.4mm / 0.41"Package Content:6 x Hex Flange Bolts