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Reference PDF

Products > Aluminum/Steel Parts(Fastener, Stamping, Die-Casting) > Reference PDF

Reference PDF

Bolt: mechanical part, cylindrical threaded fastener with nut.
A kind of fastener composed of head and screw (cylinder with external thread), which is used to connect two parts with through-hole by matching with nut.
This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection.

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According to relevant standards, the performance grade of carbon steel and alloy steel bolts can be divided into more than 10 grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9 and 12.9. Among them, bolts of grade 8.8 and above are made of low-carbon alloy steel or medium carbon steel and heat treated (quenching and tempering), which are generally called high-strength bolts, and the rest are commonly referred to as ordinary bolts.

The bolt performance grade label consists of two parts, which respectively represent the nominal tensile strength and yield strength ratio of bolt material.

Stainless steel bolts are divided into a1-50, a1-70, a1-80, a2-50, A2-70, a2-80, a3-50, a3-70, a3-80, a3-80, a4-50, a4-70, A4-80, a5-50, a5-70, c1-50, c1-50, c1-110, c4-50, c4-70, c3-80, f1-45, f1-60.

The first letter and number represent the stainless steel group, and the second and third numbers represent 1 / 10 of the tensile strength.