EVENONE Metal Screw

EVENONE Metal Screw
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$ 2.90 $2.90 -0%
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Description
There are many types of bolts, but in most cases, they are different from studs and bolt heads.
The thread of the stud can be divided into coarse thread, fine thread and inch thread, so it is called fine bolt and inch bolt.
According to the shape and purpose of the bolt head, it is divided into hexagon head bolts, square head bolts, half-round head bolts, countersunk head bolts, hole bolts, T-head bolts, hook head (foundation) bolts, etc. on.
The bolts are derived from the expansion bolts based on the attached expansion parts.
According to the materials used in production and manufacturing precision, bolts can be derived from high-strength bolts, high-precision bolts, anti-loosening bolts, etc.
Bolts are divided into more than 10 grades according to their performance grades, such as 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9. Bolts of grade 8.8 and above are made of low-carbon alloy steel or medium-sized steel. Carbon steel, after heat treatment (quenching, tempering), is usually called high-strength bolts, and the rest are usually called ordinary bolts. The bolt performance grade label consists of two numbers, which respectively indicate the nominal tensile strength value and yield ratio of the bolt material.

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