Common Sense Of Hexagon Socket Head Bolt

  •    Hexagon Socket Head Bolt indicates that fasteners are a type of mechanical parts used for fastening connections, and are widely used. It is characterized by a wide variety of specifications, different performance and uses, and a high degree of standardization, serialization and generalization. Therefore, some people call a type of fasteners that have national (industry) standards as standard fasteners, or standard parts for short. Commonly used standards mainly include German standard DIN, international standard ISO, and Chinese standard GB.
        1. Mechanical properties: The strength grades of fasteners are usually 4.8, 5.6, 8.8, 9.8, 10.9, and 12.9. Anything not specified refers to 4.8. The code of the strength grade 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, the "4" of 4.8 represents 1/100 of the nominal tensile strength of 400N/mm2. The meaning of "?" in the mark code and the number part after the point indicates 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 through a certain mechanical or chemical method, the purpose of which is to enhance the corrosion resistance, wear resistance, and decoration or other special functional requirements of the fastener. According to the classification of coatings, there are mainly galvanizing (cold galvanizing, hot galvanizing, and color zinc, white zinc, and blue zinc according to the galvanizing color), phosphating, blackening, and dacromet.
        3. China Stud Supplier's fastener anti-loose: the commonly used anti-loose methods mainly include mechanical anti-loose, thread fastener anti-loose, and riveting anti-loose. The reasons for the loosening of fasteners are mainly due to excessive thread pre-tightening force, uneven tightening force and operating vibration. Yantai standard parts manufacturers remind the correct pre-tightening force and adopt the necessary anti-loosening form to be the key. The main anti-loosening methods used in the running part of the B1 type car on Line 3 include self-locking nuts (deformed self-locking, steel sheet self-locking), tapered washers, nylon slotted bolts, anti-loosing wire, split pins, etc. In addition, it should be noted that when installing large joint surfaces or evenly distributed parts, each bolt and nut should be evenly and symmetrically tightened to the specified torque in a certain sequence.