Hexagonal bolt basic knowledge explanation of hexagonal bolt classification and model
Basic knowledge of hexagonal bolts.
Hello everyone, in daily life, the most common fasteners are hexagonal bolts, expansion screws, and diamond tail wires. Today, Guo’s screw diary will briefly talk about hexagonal bolts with you first. The hexagonal bolt is actually a fastener composed of a head with a screw. The bolts are mainly divided into iron bolts and stainless steel bolts according to the material. The words of iron are divided by grades. The common is level 4.8, level 8.8, and level 12.9. Stainless steel is made of stainless steel SUS201, SUS304, SUS316 bolt.
A complete set of hexagonal bolts consist of a bolt head and a snail flat pad
Hexagonal bolt is the hexagonal bolt (some thread) -C hexagonal bolts (full screw) -C level, also known as hexagonal bolts (coarse) hexagonal bolts, black iron screws. Common standards are: SH3404, HG20613, HG20634, etc.
Hexagonal bolts (referred to as hexagonal bolts) are composed of head and thread poles (
The comprehensive level of the material performance of the steel structure is 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, including more than 10 levels. Carbon steel is also known as high -strength bolts by related thermal treatment (quenching and recovery), and the rest is called ordinary bolts. The bolt performance level sign is composed of two parts, which represent the nominal tensile strength value and yield ratio of the bolt material. The following is an example.
Performance level 4.6 bolts, the meaning is:
1. The nominal tensile strength of the bolt material reaches 400MPA;
2. The flexion ratio of the bolt material is 0.6;
3. The nominal yield strength of the bolt material is 400 × 0.6 = 240MPA level
High -intensity bolts with performance level 10.9, after thermal treatment, the material reaches:
1. The nominal tensile strength of the bolt material reaches 1000MPa;
2. The flexion ratio of the bolt material is 0.9;
3. The nominal yield strength of the bolt material reaches 1000 × 0.9 = 900MPA level
The meaning of different levels of bolt performance is the standard of international universal. The bolts of the performance evaluation level of the same product. Regardless of the differences between the materials and the origin, their performance is the same. The design of the safety performance index is only available in design.
The above is the relevant knowledge about hexagonal bolts. I hope that you can have a reference when choosing hexagonal bolts. If you want to know more about the hexagonal bolt, you are also welcome to find “Guo’s screw diary” to communicate at any time
Product Recommendation: bolts hex