What is the difference between high-strength bolts and ordinary bolts?

From the name, high-strength bolts can usually withstand greater loads than ordinary bolts of the same specification.

Ordinary bolts are made of Q235 (i.e. A3).

The material of high-strength bolts is 45# steel, alloy steel (such as 20MnTiB, 35VB) or other high-quality materials, which are heat treated after being made to improve the strength.

The difference between the two is the difference in material strength.

The first point: From the raw material point of view:

High-strength bolts are made of high-strength materials. The screw, nut and washer of high-strength bolts are all made of high-strength steel, commonly 45# steel, 40 boron steel, 20 manganese titanium boron steel. Ordinary bolts are often made of Q235 steel.

The second point: From the strength grade point of view:

Commonly used are two strength grades of 8.8 and 10.9, of which 10.9 is the most common. The strength grade of ordinary bolts is lower, generally 4.4, 4.8, and 5.6. (8.8S and 10.9S are for steel structures only)

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