Dimension: M8 x 40mm; Rod Length(Under Head): 40mm / 1.57"; Pitch: 1.25mm / 0.049"; Flange Diameter: 18mm / 0.71"; Hex Width: 13mm / 0.51"; Hex Thickness: 8.1mm / 0.32". Material: Made of 10.9 grade carbon steel, black oxide coating finish, high strength, wear-resistant, anti-corrosion.. 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.. 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.. 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..
