Suzhou Fuxinxin Metal Products Co., Ltd.
Contact person: Guan Jianwei
Mobile phone: 13771881206
Website: www.fx86.com
Tel: 0512-62805472
Fax: 0512-62758902
Q: 1499220162
The screw fastening part has a waterproof structure in which the first part with the bottom screw hole and the second part with the screw hole are fastened together by using the screw inserted into the screw hole and tightened to the screw hole. The screw is a flat head screw embossing nut, and an annular groove is formed on the outer surface of the gasket having an insertion hole, and a concave conical surface is formed in the insertion hole.
The gasket is assembled in the screw insertion hole to contact the conical surface of the head of the flat head screw. Annular groove and concave conical surface) coaxial. The O-ring is inserted into the annular groove, and the flat head screw is fastened by using the gasket arranged between the first part and the second part, so that the O-ring is pressed between the inner surface of the annular groove and the surface of the screw insertion hole of the second part. The waterproof structure can be reused without damaging the part and increasing the required space.
The main purpose is to make the industrial products fixed in one. In use, there are often problems such as the insensibility between teeth, the breakage of screw head due to excessive locking, or the inadequate locking of dental threads, which fail to meet the service conditions. These are all problems of quality accuracy. Screws are "quantity products", not handmade works of art. In mass production, in order to achieve high precision and stable quality and popular price supply to consumers. The accuracy of the screw is usually 6G (grade 2, IFI is 2A) and 8g (grade 3, IFI is 1A) for construction. The value of screw is very important. There are some examples of automobile factory bankruptcy due to poor quality of screw in the world. There are also examples of aircraft crash and vehicle subversion due to poor quality of screw.
Common Screw Types
A: Machine Screw: Mechanical Screw
B: Tapping Screw: Self tapping screw (for metal and 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 drill tail screw (stainless steel drill tail screw, composite drill tail screw)
F: Expansion screw, four expansion screw, also known as: four geckos. Expansion bolts are classified into 45, 50, 60, 70 and 80 grades. Expansion bolts are mainly made of austenite A1, A2 and A4.
Stainless steel plate, metal plate, galvanized steel plate, engineering installation.
2. Installation of metal light compartments of metal curtain walls indoors and outdoors.
3 General angle steel, channel steel, iron plate and other metal materials combined installation.
4. Assembly works of automobile trucks, container boxes, shipbuilding, refrigeration, screw machine equipment, etc.
Characteristic:
1. Drilling and tapping teeth, locking once, strong bonding force.
2. Save construction time and improve work efficiency.
E-1: STAINLESS STEEL SELF DRILLING SCREWS stainless steel tail screw
E-2:Bi-Metal Self Drilling Screws Composite Drilling Screws
Screws are indispensable industrial necessities in daily life: such as cameras, glasses, clocks and watches, electronics, etc., using micro-screw; general screw for TV, electrical products, musical instruments, furniture, etc; large screw and nut for engineering, construction and bridges; transportation equipment, aircraft, trolley cars, automobiles, etc. Screws are used together. The screw has an important task in industry. As long as there is industry on the earth, the function of the screw will always be important.
There are many types of screw, whether it is miniature screw for glasses or large screw for heavy electrical engineering. The accuracy of screw is usually 6G (grade 2, IFI is 2A) and 1g (grade 3, IFI is 1A) for construction.
Common Material
A. Low Carbon Steel: Carbon steel consists of low carbon steel, medium carbon steel, high carbon steel and alloy steel.
B. SS-304: Stainless Steel 304, 316 belong to stainless steel and so on.
C. SS-302: Stainless Steel 302: Structural toughness is good
D. Aluminum 5052: Aluminum alloy 5052
D. Brass: Brass
E. Bronze: Bronze
F. UNS C11000 Copper: Antimony Copper
Material knowledge
The standard parts in the former market are mainly carbon steel, stainless steel and copper.
1. Carbon steel. We distinguish low-carbon steel, medium-carbon steel, high-carbon steel and alloy steel by carbon content in carbon steel.
1 Low carbon steel C%<0.25% is commonly referred to as A3 steel in China. Foreign countries are basically called 1008, 1015, 1018, 1022, etc. Mainly used for 4.8 grade bolts and 4 grade nuts, small screws and other products without hardness requirements. (Note: Drilling tail nails are mainly made of 1022 materials.)
2. 0.25% carbon steel
3 High carbon steel C%>0.45%. It's basically not in use on the market.
Alloy steel: Alloy elements are added to ordinary carbon steel to increase some special properties of steel, such as 35, 40 chromium and molybdenum, SCM435, 10B38. The aromatic screw mainly uses SCM435 chromium-molybdenum alloy steel, the main components are C, Si, Mn, P, S, Cr, Mo.
Stainless steel. Performance Level: 45, 50, 60, 70, 80
1. Austenite (18% Cr, 8% Ni) has good heat resistance, corrosion resistance and weldability. A1, A2, A4
2. Martensite and 13% Cr have poor corrosion resistance, high strength and good wear resistance. C1, C2, C4 ferritic stainless steel. 18% Cr upsetting forging has better corrosion resistance than martensite. The main imported materials in the market are Japan. According to the level, they are SUS302, SUS304 and SUS316.
Three copper. Commonly used material is brass. Zinc-copper alloy. In the market, H62, H65 and H68 copper are mainly used as standard parts.
Screw marking
The labeling format of thread marking is as follows:
Thread Code - Thread Tolerance Belt Code (Medium Diameter, Top Diameter) - Turning Length
L) Tolerance band codes are denoted by numbers plus letters (inside)