Bolts are common mechanical parts and are often used in many places. It is a type of fastener consisting of two parts, the head and the screw. It needs to be used with a nut. It is mainly used to fasten and connect two parts with through holes. Maybe you don't know anything about the grade of the bolt. Hex Bolt China Supplier will introduce you to the bolt material and grade.
What is the grade and material of the bolt?
The bolt grade refers to the bolt grade of 4.8, 8.8, 10.9 and so on.
The material refers to the material used for the bolt, such as 45# steel, 35CrMo steel, and 304 stainless steel.
The grade and material of the bolt are related to each other. Low carbon steel can only produce low-strength grade bolts, carbon steel can produce medium-strength grade bolts, and alloy steel can produce high-strength grade bolts. Some bolt grades specify the corresponding chemical composition and mechanical properties, and the materials are specified.
So, how to distinguish the bolts on the hand from high-strength bolts in real life? If the bolt head is marked with 4.8 or 8.8, it can be directly judged whether it is a high-strength bolt. Secondly, it can be divided from the color. If it is black, it can be estimated to be a high-strength screw. Moreover, the sound of the torture can also be divided, and the sound of the high-strength bolt is relatively crisp. You can also use a sander to grind and see the spark to judge. In short, to judge whether a bolt is high-strength, there are still many methods.