The main purpose is to make the industrial products form a fixed one. In use, it often occurs that the teeth cannot be closely attached, and the screw heads will be broken if they are tightened too hard, or the teeth will not be locked tightly and fail to meet the conditions of use, which are all problems of accuracy. . Screws are "mass products", not hand-made works of art. In mass production, they are supplied to consumers in order to achieve high precision, stable quality and popular prices. The accuracy of screws is usually 6g (class 2, the American standard "IFI" is 2A teeth), and the rough screws used in construction projects are 8g (class 3, "IFI" is 1A teeth).
Common types of screws
screw
A: Machine Screw: Machine Screw
B: Tapping Screw: Self-tapping screw (for metal and for plastic)
B-1: Sheet Metal Tapping Screw.
B-2: Plastic Tapping Screw.
C: Wooden Screw : Woodworking Screw
D: Drywall Screw : Cement Wall Screw
E: Self Drilling Screws (Stainless Steel Drilling Screws, Composite Drilling Screws)
F: Expansion screw, four-piece expansion screw, also known as: four-piece gecko. The grade of the expansion bolt is divided into: 45, 50, 60, 70, 80, The material of the expansion screw: mainly divided into austenite A1, A2, A4,
1Stainless steel plate, metal steel plate, galvanized steel plate, engineering installation.
2. Indoor and outdoor installation of metal curtain wall and metal light compartment.
3 Generally, angle steel, channel steel, iron plate and other metal materials are combined for installation.
4. Assembly engineering of car boxes, container boxes, shipbuilding, refrigeration, screw machine equipment, etc.
Features:
1. Drilling and tapping, locking is completed at one time, and the bonding force is strong.
2. Save construction time and improve work efficiency.
E-1:STAINLESS STEEL SELF DRILLING SCREWS
E-2: Bi-Metal Self Drilling Screws
Common materials
a.Low Carbon Steel: Carbon steel Carbon steel is divided into low carbon steel, medium carbon steel, high carbon steel and alloy steel.
b. SS-304 : Stainless Steel 304 and 316 belong to stainless steel
c. SS-302: Stainless Steel 302: better structural toughness
d. Aluminum 5052
d. Brass
e. Bronze
f. UNS C11000 Copper
