Hexagon socket head bolts
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4.8 level 8.8 level 10.9 level 12.9 level internal hexagon bolt cylindrical head internal hexagon
The cylindrical head hexagonal bolt is a high-strength bolt and also a type of standard component. Strong connection strength, widely used in machine tools and their accessory workpieces. Internal hexagonal bolts are classified into ordinary and high-strength according to their strength levels. Ordinary hexagonal bolts refer to grade 4.8, while high-strength hexagonal bolts refer to grades 8.8 and above, including grades 10.9 and 12.9. Grade 12.9 internal hexagonal bolts generally refer to black internal hexagonal cup head screws with knurled, natural color, and oil.
Black: Blackening is a common method of metal heat treatment. The principle is to form an oxide film on the surface of the metal to isolate air and achieve the purpose of rust prevention. Blackening is a common method of metal heat treatment. The principle is to form an oxide film on the surface of the metal to isolate air and achieve the purpose of rust prevention.
The materials of the hexagon socket bolts mainly include the following:
Carbon steel. Common carbon steel materials include 45 #, 40Cr, 35CrMo, etc. These materials have good plasticity and heat treatment performance, but poor corrosion resistance. one hundred and twenty-three thousand four hundred and fifty-six
Alloy steel. Alloy steel materials include 20CrMoTi, 42CrMo, 40CrNiMo, etc. These materials have high strength and wear resistance, and are suitable for bearing large loads.
Stainless steel. Stainless steel materials include 304, 316, and 316L, which have excellent corrosion resistance, high strength, and high temperature stability, and are suitable for fields such as food, medical, and chemical engineering. one million two hundred and thirty-four thousand five hundred and sixty-seven
Brass. Brass material is mainly used in special occasions that require anti-corrosion, conductive or thermal conductivity, such as electrical equipment, ships, and automobiles.
Similar to countersunk screws, the nail head is buried in the machine and has a high connection strength, but the screw must be installed and removed using a corresponding hex wrench. Generally used on various machine tools and their accessories.
The performance grades of internal hexagonal bolts used for steel structure connections are divided into more than 10 grades, including 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9, etc. Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium carbon steel and heat treated (quenched and tempered), commonly referred to as high-strength bolts, and the rest are called ordinary bolts. The bolt performance grade designation consists of two parts of numbers, representing the nominal tensile strength value and yield strength ratio of the bolt material.
Hexagonal bolts are widely used in various fields, and they play a crucial role in different engineering projects due to their high strength, stability, and reliability. Whether in automobile manufacturing, shipbuilding industry, furniture manufacturing, or construction engineering, hexagonal bolts can meet various needs and ensure the stability and safety of the required structure.
