Material Of 8.8 Grade Bolts Standard For 8.8 Grade Bolts

There is actually no specific regulation for the material of grade 8.8 bolts, only the allowable range of chemical composition is specified. As long as the material meets the requirements within this specified range, it can be used as a material for grade 8.8 high-strength bolts. However, many professionals still consider the standard for grade 8.8 bolts as an important reference for material selection.

In order to meet the performance requirements of 8.8 grade bolts with different requirements, the material must undergo special heat treatment to achieve the following characteristics:

1. The nominal tensile strength of the bolt material reaches up to 640MPa level;

2. The yield strength ratio of bolt material is 0.8;

3. The nominal yield strength of bolt material reaches 640 × 0.8=800MPa level;

4. When selecting materials, grade 8.8 hexagonal bolts can use materials such as 1035ACR (for M10 and below) and 1040ACR (for M12 and above), CH38F, 1045ACR, 1039, 10B21, 10B33, 10B38, etc;

5. 8.8 grade hexagonal bolts can use materials such as CH38F, 1039, 10B21 (for M10-M12), 10B33 (for M14), 10B38 (for M12-M24), 1035ACR (for M10 below), and 1040ACR (for M12 above);

6. The disc elements used in carbon steel products can be selected according to different types of materials. For example, 4.8 grade hexagonal bolts can be made of materials such as 1008K, 1010, and 1015K, 6.8 grade hexagonal bolts can be made of materials such as 1032, 1035, 1040, CH38F, and 1039, 8.8 grade hexagonal bolts can be made of materials such as 1035ACR (for M10 and below) and 1040ACR (for M12 and above), CH38F, 1045ACR, 1039, 10B21, 10B33, and 10B38, and 8.8 grade internal hexagonal bolts can be made of materials such as CH38F, 1039, 10B21 (for M10-M12 and above), and 10B38. Materials such as B33 (for M14), 10B38 (for M12-M24), 1035ACR (for M10 below), and 1040ACR (for M12 above) can be used for grade 10.9 hexagonal bolts. Materials such as 1045ACR and 10B38 can be used for grade 8 and above nuts. Materials such as 1015 (M<16) and CH38F (M ≥ 16) can be used for grade 10 nuts. Materials such as CH38F, 1039, 10B21, and 10B33 can be used for grade 12 nuts. Materials such as 1039, 10B21, 10B33, and 10B38 can be used for carriage screws. 1015 and other materials can be used for hexagonal protruding bolts, CH38F, 1039, 10B21, 10B33, 10B38 and other materials can be used. Hexagonal wood screws can be made of 1008K, 1010 and other materials, including self tapping nails, wall panel nails, drill tail nails, etc Plywood nails can be made of materials such as 1018, 1022, CH22A, etc.

Having a thorough understanding of the material and performance requirements of grade 8.8 bolts can help you better select suitable materials to meet your engineering needs.