Expansion Bolt

   The product details of the national standard expansion screw 8 * 80 are as follows:
Specifications and dimensions
Diameter: The diameter of the screw is 8mm.            Length: The overall length is 80mm.
structural composition
Screw: usually made of metal, such as carbon steel, stainless steel, etc., with threads on the surface, and one end is a hexagonal head or other shaped head, which is convenient for screwing with tools
Tight, the tail is conical.
Expansion tube: generally made of plastic, rubber or metal, sheathed on the screw, with an outer diameter slightly smaller than the diameter of the mounting hole. When the screw is tightened, the expansion tube will expand
Close to the hole wall.
Nut: Match with the screw thread, push the expansion tube to expand by rotation, and some are also equipped with washers to increase the contact area between the nut and the connected parts and improve the
Connection stability.
Materials and properties
Materials: Common materials are Q235 carbon steel, stainless steel, etc. Stainless steel materials are divided into austenitic A1, A2, A4, martensite and ferrite C1,
C2, C4, etc.
Performance grades: Common grades are 4.8, 10.9, etc. Grade 4.8 indicates that the nominal tensile strength of the material reaches 400MPa, and the yield ratio is 0.8, public
The yield strength is said to reach 400 × 0.8 = 320MPa level
Surface treatment: common galvanizing treatment, including color zinc plating, white zinc plating, etc., can improve rust resistance and aesthetics.
Scope of application
Building decoration: used to fix doors and windows, air conditioning brackets, water heaters, chandeliers and other building structures and decorative materials.
Mechanical installation: Fix the base of the mechanical equipment on the foundation ground to ensure the stable operation of the equipment.
Electrical installation: Fix electrical switches, sockets, distribution boxes, cable trays and other electrical equipment and line supports.
Installation points
Drilling: Select the alloy drill bit that matches the outer diameter specification of the expansion screw, and drill according to the length of the expansion screw. The hole depth is preferably 5 mm longer than the expansion tube
Right, clean the hole of impurities.
Protect the thread and insert the expansion bolt into the hole.
Installation: Install the flat pad, elastic pad and nut, and screw the nut to the screw
Tightening: Twist the wrench until the gasket is flush with the surface of the fixture. Generally, after tightening by hand, use the wrench to twist three to five times.