What is Hexagon Socket Head Cap Screw?

Commonly used hexagon socket head screws also have 4.8, 8.8, 10.9, and 12.9. Also called hexagon socket screws, also called hexagon socket bolts. Its head is hexagonal and cylindrical. According to the material, there are stainless steel and iron. Stainless steel has stainless steel SUS202 hexagon socket head screw. This is a common stainless steel material. There are stainless steel SUS304 hexagon socket head screw and stainless steel SUS316 hexagon socket head screw. The iron is classified according to the strength grade of the hexagon socket head screw. There are 4.8 grade hexagon socket head screws, 8.8 grade hexagon socket head screws, 10.9 grade hexagon socket head screws, and 12.9 grade hexagon socket head screws. Class 8.8-12.9 hexagon socket head screws are called high-strength, high-grade hexagon socket bolts.

Hardness of Hexagon Socket Head Cap Screw

Hexagon socket bolts are classified according to the hardness of the screw wire, tensile force, yield strength, etc., which is the grade of the hexagon socket bolt and what is the grade of the hexagon socket bolt. Different product materials require different grades of hexagon socket bolts to correspond to them. All hexagon socket bolts have the following grades:
Hexagon socket bolts are divided into ordinary and high-strength according to their grade strength. Ordinary hexagon socket bolts refer to grade 4.8, and high-strength hexagon socket bolts refer to grades 8.8 and above, including grades 10.9 and 12.9. Class 12.9 hexagon socket bolts generally refer to knurled, natural black hexagon socket head screws with oil.

The performance grades of hexagon socket bolts for steel structure connection are divided into more than 10 grades such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, among which the bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel. After heat treatment (quenching and tempering), they are generally called high-strength bolts, and the rest are generally called ordinary bolts. The bolt performance grade label consists of two numbers, which respectively represent the nominal tensile strength value and the yield ratio of the bolt material.

Crafting process of Hexagon Socket Head Cap Screw

1. Drill holes according to the diameter of the opposite side of the inner hexagon to the requirements.
2. Upsetting the inner hexagon with a cold heading machine.
3. A single piece can be punched out with a hex punch.

Application of Hexagon Socket Head Cap Screw

Similar to countersunk screws, the Hexagon Socket Head Cap Screw is buried in the machine, and the connection strength is greater, but the screw must be assembled and disassembled with the corresponding specification Allen wrench. Generally used on various machine tools and their accessories.

Performance requirements of Hexagon Socket Head Cap Screw

1. The nominal tensile strength of bolt material reaches 400MPa;
2. The yield ratio of the bolt material is 0.6; the nominal yield strength of the bolt material reaches 400×0.6=240MPa.
Performance grade 10.9 grade high-strength bolts, after heat treatment, can reach:
1. The nominal tensile strength of bolt material reaches 1000MPa;
2. The yield ratio of the bolt material is 0.9; the nominal yield strength of the bolt material reaches 1000×0.9=900MPa.
The meaning of the performance grade of hexagon socket bolts is an international standard. The performance of the bolts of the same performance grade is the same regardless of the difference in material and origin. Only the performance grade can be selected in the design.
The classification of hexagon socket bolts is basically like this, and the price on the market is definitely different for different grades. The price of general high-strength hexagon socket bolts is definitely higher than that of ordinary hexagon socket bolts. Generally used in the market are 4.8 grades, 8.8 grades, 10.9 grades, and 12.9 grades.