Common application of screws
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- Time of issue:2019-09-25 21:01
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The main purpose is to make the industrial products into a fixed unit. In use, it often occurs that the teeth and the teeth cannot be tightly sealed, if the screws are too tightly locked, or the screw heads are broken, or the dents are not tightly locked, etc., the quality is Precision problem. Screws are "quantity products", not hand-made artworks. In mass production, they are supplied to consumers with high-precision and stable quality and popular prices. The accuracy of the screw is usually 6g (level 2, American standard "IFI" is 2A), and the coarse screw for construction engineering is 8g (level 3, "IFI" is 1A). The value of the screw is very important. There are examples of the bankruptcy of the car factory due to poor screw quality in the world. There are also examples of airplane crashes and vehicle subversion caused by poor screw quality.
Common screw types
A: Machine Screw: Machine Screw
Screw
Screw
B: Tapping Screw: self-tapping screws (used in metal and used in plastic)
B-1: Sheet Metal Tapping Screw.
B-2: Plastic Tapping Screw. (Plastic, self-tapping screws)
C: Wooden Screw : Wood Screws
D: Drywall Screw: cement wall screw
E: Self Drilling Screws (stainless steel self-drilling screws, composite self-drilling screws)
F: expansion screw, four expansion screws, also known as: four gecko. The grades of expansion bolts are divided into: 45, 50, 60, 70, 80. Materials of expansion screws: mainly divided into austenite A1, A2, A4,
1 stainless steel plate, metal steel plate, galvanized steel plate, engineering installation.
2 metal curtain wall metal light compartment and other indoor and outdoor installation.
3 General angle steel, channel steel, iron plate and other metal materials are installed together.
4. Assembly work of automobile car, container box, shipbuilding industry, freezing, screw machine equipment, etc.
Features:
1. Drilling and tapping, the locking is completed once, and the bonding force is strong.
2. Save construction time and improve work efficiency.
Previous :
Screw standard tightening torque table
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