ISO 7412-1984 Class 8.8 and class 10.9 high strength steel structure bolts with large hexagonal head

Hexagon bolts for high-strength structural bolting with large width across flats-Property classes 8.8 and 10.9 are specifically designed for high-strength steel structure bolting, featuring large across flats and short threads. The bolt thread specifications range from M12 to M33, with a pitch varying from 1.75mm to 3.5mm. These bolts come in performance grades of 8.8 and 10.9, and their surfaces can undergo treatments such as blackening, hot-dip galvanizing, and dacromet, depending on specific requirements, to enhance corrosion resistance. 

Functional Characteristics

• High strength: ISO 7412-1984 bolt performance classes include classes 8.8 and 10.9, where bolts have been specially heat treated and materials selected for high tensile and yield strength.
• Large hexagonal head: the head of the bolt is designed to be hexagonal, which is easy to use tools such as wrenches to tighten and disassemble, improving work efficiency.
• Short thread: The threaded part of the bolt is relatively short, suitable for specific connection needs, such as space limited occasions.
• Standardization: ISO 7412-1984 is an international standard that ensures uniformity and interchangeability of bolts in terms of size, material and performance.

Application
These bolts are employed in applications requiring high load-bearing capacity and robust connections, including construction, bridges, machinery, and equipment.

• Construction: Used for the connection and fastening of steel structure buildings, such as Bridges, high-rise buildings, etc.
• Mechanical: Used in mechanical equipment to connect and fix key components to ensure the stable operation of the equipment.
• Transportation: Used in railway, road and other transportation facilities to connect and tighten tracks, Bridges and other structures.
• Aerospace: In the aerospace field, it is used to connect key parts such as aircraft structures and engine components.