Material: A3 low carbon steel 35K high speed steel wire rod 45# steel 40CR 35Crmoa
    Hardness grade: 4th grade 5th grade 6th grade 8th grade 10th grade 12th grade
    Surface treatment: generally divided into three types: color galvanized, white galvanized, and black galvanized, and generally cold galvanized!
    Main specifications: M5 M6 M8 M10 M12 M16 M20 (flange nuts with specifications above M20 and M14 M18 are not commonly used)
    2. Related functions of flange nuts
    Flange nuts and general hexagon nuts are basically the same size as thread specifications, but compared with hexagon nuts, it is a gasket and nut that are integrated, and there are anti-slip tooth lines on the bottom, which increases the nut and workpiece. The contact surface area is stronger and stronger than the combination of ordinary nuts and washers.
    Generally, the specifications of common flange nuts are generally below M20, because most of the flange nuts are used on pipes and flanges, so due to the constraints of the workpiece, the specifications of flange nuts are less than those of nuts. Most of the flange nuts above M20 are flat flanges, that is, there is no tooth pattern on the flange surface. Most of these nuts are used in some special equipment and special places, and the general sales manufacturers do not have them in stock.