Hexagon socket bolts, hexagon socket head screws, and h […]
Hexagon socket bolts, hexagon socket head screws, and hexagon socket screws. Although the names of these words are different, they all have the same meaning, and they all mean a kind of screw. Hexagon socket screws are classified according to the hardness, tensile strength, yield strength, etc. of the screw wire, that is, hexagon socket screws. Different product materials require different grades of hexagon socket bolts to correspond to them. What are the different types of hexagon socket screws?
The types of hexagon socket screws are divided into ordinary and high-strength according to their grade strength.
Ordinary hexagon socket screws refer to grade 4.8, and high-strength hexagon socket screws refer to grades above 8.8, including grades 10.9 and 12.9. Class 12.9 hexagon socket screws generally refer to knurled, natural black hexagon socket head screws with oil.
Hexagon socket screws for steel structure connection are divided into more than 10 grades. The bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-carbon steel and are heat-treated (quenched and tempered). They are commonly referred to as high-strength bolts, and the rest are commonly referred to as high-strength bolts. Ordinary bolts.
Different types of hexagon socket screws The performance grade label of hexagon socket screws consists of two parts, which respectively represent the nominal tensile strength value and yield ratio of Shanghai hexagon socket screws. For example, a bolt with a performance level of 4.6, its meaning is:
1. The nominal tensile strength of the bolt material reaches 400MPa;
2. The yield strength ratio of the bolt material is 0.6; the nominal yield strength of the bolt material reaches 400×0.6=240MPa.
The types of hexagon socket screws are distinguished by performance grade 10.9 high-strength bolts. After heat treatment, the material can reach:
1. The nominal tensile strength of bolt material reaches 1000MPa;
2. The different types of hexagon socket screws have a yield ratio of 0.9; the nominal yield strength of the bolt material is up to 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.