The head of the external hexagonal bolt is hexagonal and the shaft is threaded. Generally, the shorter one is full thread and the longer one is half thread. The materials of external hexagonal bolts generally include carbon steel, stainless steel, brass, nylon plastic, etc. Hexagonal bolts made of carbon steel generally include grade 4.8, grade 8.8, grade 10.9, and grade 12.9. Grades 8.8 and above are all made of alloy steel. The hardness and tensile properties of alloy steel are much better. These are also called high-strength bolts.
Commonly the stainless steel hexagonal bolts include SUS201 / SUS316 / SUS304. The tensile strength grades are divided into 45, 50, 60, 70 and 80. Due to the material characteristics of stainless steel bolts, their anti-corrosion performance will be better and their appearance will be bright. Hexagonal bolts are widely used indoors and outdoors.
Stainless steel (SUS) hex bolts are used in a variety of industrial applications, including:
Construction: Used in the erection, repair, and maintenance of buildings, bridges, and road infrastructure
Oil and gas: Used in oil and gas applications
They are also mostly used indoors in mechanical equipment, medical equipment, electronic instruments, etc.
In the fields of electronic instruments, medical instruments, stainless steel hexagonal bolts are generally chosen because the surface color of stainless steel is brighter and has better anti-corrosion properties, so it can maintain its appearance for a long time.
This Standard of B18.2.1 covers the complete general and dimensional data for nine product types of inch series square and hex bolts and screws.
The specific parameters of this product are as follows:

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