Fasteners are widely used in all walks of life, not only in a wide range of specifications but also with a high degree of standardization and generalization across different regions. As a result, in order to more accurately describe a fastener product, we will primarily describe some important fastener parameters.
For example, if you're looking for High Strength Full Thread Hex Bolts, you can tell us DIN933, M618, C1045, 12.9, and black.
Incredible! A fastener product can be fully described by a few simple parameters.
Then allow me to take you on a detailed tour of these parameters!
1. Standard And Name
Take DIN933 as an example again. Full Thread Hexagon Head Bolt is the product name, and DIN933 is the standard number.
The most accurate method, however, is to dial the product's standard number. Because ISO 4017 is also a product name, there are many inconsistencies between the two standards, such as size.
Standards are norms, and every country and industry has its own set of standards. The following are the most commonly used standards in our daily business at the moment:
GB—National Standard of China
DIN—Deutsches Institut für Normung
ISO—International Organization for Standardization
ANSI—American National Standards Institute
ASME—American Society of Mechanical Engineers
JIS—Japanese Industrial Standards
2. Particulars
In general, a screw is written as nominal diameter pitch length.
The nominal diameter is referred to as the thread's outer diameter. M3, M4, M5, M6, M8, M10, M12, and so on are common metric sizes, while imperial sizes are 4#, 6#, 8#, 10#, 12#, 1/4, 5/16, 3/8, and so on.
Pitch, also known as thread pitch in the metric system, is the distance between two adjacent thread crests. In imperial, it is expressed as thread per inch (4 mm), which is commonly abbreviated as TPI.
The effective length of the embedded object to be loaded is referred to as the fastener length. Countersunk head screws, for example, are loaded with the total length, whereas raised countersunk head screws must add the length of the head.
3. Substance
Carbon steel, stainless steel, stainless iron, copper, aluminum, titanium alloy, and other materials are commonly used.
Carbon steel is classified as low-carbon steel (C1008, C1010, C1015, C1018, C1022), medium-carbon steel (C1035), high-carbon steel (C1045, C1050), and alloy steel.
C1008 material is commonly used to make ordinary grade products, such as 4.8 Grade ordinary products; C1035 material is commonly used to make 8.8 Grade products; and C1045, 10B21, and 40Cr material is commonly used to make 10.9 Grade or 12.9 Grade high-strength grade products.
The most common stainless steel materials are SS302, SS304, and SS316. Of course, products made of SS201, as well as products with lower nickel content, are now popular. Although this product appears to be stainless steel, its anti-corrosion performance is vastly different.
4. Classification/Grades
Carbon steel fasteners are classified as 4.8, 5.8, 6.8, 8.8, 10.9, and 12.9.
The vast majority of stainless steel fasteners are manufactured and labeled in accordance with class 70 (minimum tensile strength of 700 MPa). If the product is not marked, it is assumed to be class 50.
5. Surface
The main purpose of surface treatment is to improve anti-corrosion performance and to color the product, so surface treatment is generally required for carbon steel products.
Black, zinc plate, copper plate, nickel plate, chrome plate, silver plate, gold plate, Dacromet, Geomet, hot dipped galvanized, phosphating, and other common surfaces are available.
Surface treatment is classified into two types: environmental protection and non-environmental protection. Each treatment method uses a different coating thickness to accommodate different salt spray test results.
