Product Information:

Name: Hexagon socket bolt

Material: Grade 12.9 high strength

Surface: Blackened

Packaging: Plastic bags/paper boxes

The specifications are composed of d * L, such as M4 * 40 (thread diameter 4mm * length 40mm), excluding head length

1. What material steel are used for grade 8.8, 10.9, and 12.9 bolts?

Grade 8.8 bolts are commonly made of 35 # or 45 # steel,

Grade 10.9 bolts are commonly used in 40Cr, 35CrMo, and 42CrMo;

Grade 12.9 screws are commonly used in 35CrMo and 42CrMo.

The material of high-strength bolts is 35 # steel or other high-quality materials, which undergo heat treatment after production to improve strength. High strength bolts can withstand a greater load than ordinary bolts of the same specification.

2. What are the specific meanings of grade 8.8, 10.9, and 12.9 in high-strength bolts?

Taking 10.9 as an example, it represents the mechanical performance level of bolts, where 10 represents a tensile strength of 1000MPa and 9 represents a yield strength ratio (0.9). There are clear standards in GB/T 3098.1, and the hardness value of bolts can also be found. That is to say, as long as the performance level of the bolt is provided, it is equivalent to defining the strength of the bolt

3. Will high-strength bolts rust?

High strength bolts can rust. High strength bolts are classified according to their strength level, not corrosion resistance, and can be used in general environments. However, they can also rust. If the corrosion resistance is important, it is recommended to use stainless steel bolts.