What are the standard specifications for high-strength bolts?

High strength bolts are bolts used to connect industrial equipment such as steel structures, bridges, and machinery. Due to the need to withstand extreme tensile and shear forces, high-strength bolts not only need to have high strength and hardness, but also must ensure corrosion resistance, wear resistance, and the ability to maintain long-term tightening. Internationally, there are several common standards for high-strength bolts:

1. ASTM A325 high-strength bolt

ASTM A325 high strength bolt is a kind of bolt used for steel structural join. It has high strength and corrosion resistance, and is widely used in large bridges, steel structure buildings, mining equipment and other fields. The diameter range of ASTM A325 bolts is from 1/2 inch to 1.5 inch, and they are usually treated with a bright surface or galvanized surface.

2. ASTM A490 High Strength Bolt

ASTM A490 high-strength bolts are a type of higher strength bolt commonly used in fields such as marine, aerospace, and national defense. Compared with A325 bolts, it has better corrosion resistance and higher strength, but it is also more expensive. The diameter range of ASTM A490 bolts is from 1/2 inch to 1.5 inch, and they are usually treated with a bright surface or galvanized surface.

3. DIN6914 High Strength Bolt

DIN6914 high-strength bolt is a high-strength bolt standard developed by the German Organization for Standardization. Its diameter ranges from M12 to M36, with strength levels of 10.9, 12.9, and 14.9, and can be used for connecting machine tools, reinforced concrete structures, and other fields.

4. ISO 4017/ISO 4032 high-strength bolts

ISO 4017/ISO 4032 high-strength bolts are high-strength bolt standards developed by the International Organization for Standardization, typically using diameter based dimensions such as M8, M10, M12, M14, etc. Its strength levels are 8.8, 10.9, and 12.9 respectively, making it suitable for various mechanical equipment, industrial construction, and other fields.

5. GB1228/GB1230 high-strength bolts

GB1228/GB1230 high-strength bolts are the high-strength bolt standards formulated by the Chinese National Organization for Standardization. Its specifications are similar to ISO standards, usually using diameter based dimensions such as M8, M10, M12, M14, etc. Its strength levels are 8.8, 10.9, and 12.9, which are applied to various mechanical equipment, industrial buildings, and other fields.

In short, there are various standard specifications for high-strength bolts, including American ASTM, German DIN, international ISO, and Chinese GB. It is very important to choose bolts with appropriate standard specifications for different usage scenarios and requirements.