Threaded Rods And Eye Bolts indicates that Hexagon Flange Bolt is a type of mechanical part used for fastening connection, which is widely used. It is characterized by a variety of specifications, different performance and uses, and a high degree of standardization, serialization, and generalization. Therefore, some people refer to a type of Hexagon Flange Bolt that has existing national (industry) standards as a standard Hexagon Flange Bolt, or simply a standard part. The commonly used standards mainly include the German standard DIN, the international standard ISO, and the Chinese standard GB.
    1. Mechanical properties: The strength grades of Hexagon Flange Bolt are usually 4.8, 5.6, 8.8, 9.8, 10.9, and 12.9, all of which refer to grade 4.8 if not specified. The code of the intensity level mark consists of two numbers separated by "?". The meaning of the number part before the “?” in the mark code indicates the nominal tensile strength. For example, “4” in grade 4.8 indicates 1/100 of the nominal tensile strength of 400N/mm2. The “?” in the mark code and the number part after the point indicate the yield strength ratio, that is, the ratio of the nominal yield point or the nominal yield strength to the nominal tensile strength. For example, the yield point of grade 4.8 is 320 N/mm2.
    2. Surface treatment: It is the process of forming a covering layer on the surface of the workpiece by a certain mechanical or chemical method. Its purpose is to enhance the corrosion resistance, wear resistance, decoration and other special functional requirements of Hexagon Flange Bolt. According to the coating classification, there are mainly galvanized (cold galvanized, hot galvanized, according to the color of galvanized zinc zinc, white zinc, blue zinc), phosphating, blackening, dacromet.
    3. Threaded Rods And Eye Bolts anti-loosening: The commonly used anti-loosening methods are mainly mechanical anti-loosening, thread fastening agent anti-loosening, riveting and punching anti-loosening. The cause of the loosening of Hexagon Flange Bolt is mainly due to excessive thread pretension, uneven tightening force and running vibration. Yantai standard parts manufacturers remind the correct pretension and take the necessary anti-loosening form is the key. The anti-loosening methods adopted by the running part of the B1 car of Line 3 are self-locking nuts (deformation self-locking, steel sheet self-locking), tapered washers, nylon slotted bolts, anti-loosening wire, cotter pins, etc. In addition, it should be noted that when installing a large joint surface or uniformly distributed parts, each bolt and nut should be tightened evenly and symmetrically to a prescribed torque in a certain order in a certain order.