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2022/11/08

Introduction to bolt strength classes

Strength grades are classified according to mechanical properties. According to the relevant standards, the bolt performance grade is divided into 3.6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 and more than 10 grades, of which 8.8 and above bolts made of low-carbon alloy steel or medium carbon steel and heat treatment (quenching, tempering), commonly known as high-strength bolts, the rest are commonly known as ordinary bolts. The bolt performance grade number has two parts consisting of numbers, which indicate the nominal tensile strength value of the bolt material and the flexural strength ratio. For example.

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2022/11/08

Bolt manufacturing process

The first is the punching of the head, where the head of the screw is punched out of the wire and the wire is cut. The second is thread rolling, where two files are used to thwart the threads on top of the previous process.

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2022/11/08

Performance grades for hexagonal flange bolts

The bolt performance grade is composed of two numerical parts, which indicate the nominal tensile strength value and the flexural strength ratio of the bolt material.

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2022/11/08

What are the common automotive fasteners

Generally we use most of the fasteners belong to the type of general-purpose parts, its standard type is still quite high, the common fastener parts are the following 12 kinds:

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2022/11/08

What is the purpose of the vibration damping bolts?

Shock-absorbing bolt; consisting of a screw, a rubber column, said screw has a screw head larger than its diameter, said screw head of the screw is embedded in the two ends of the rubber column, the end face of the screw head near the thread is flush or slightly convex with the end face of the rubber column, and the screws at both ends of the rubber column are coaxial.

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2022/11/08

What are the fasteners made of brass screws, brass nuts, brass bolts and brass?

Copper has a long history of use, with our ancestors having mastered the smelting and processing of copper as early as the Shang and Zhou dynasties. Today, copper as an excellent conductive material can be found everywhere in everyday life.

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2022/11/08

What are high strength bolts

What is a high strength bolt and what is the difference between it and an ordinary bolt? When we purchase high strength bolts, we will ship bolts with the number "8.8" or "12.9" printed on the head, these are the more commonly used high strength bolt markings, we usually refer to the bolts above 8.8 strength as high strength bolts The difference between high strength bolts and ordinary bolts is mainly in the following areas.

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2022/11/08

Automotive fasteners

What is an automotive fastener? This question is well answered. Retail components used in automobiles with a threaded coupling function are called automotive fasteners. Although automotive fasteners are not regulated as a special industry, they are an industry that requires high safety and quality standards.

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2022/11/08

What are the materials used to produce stainless steel screws

Why say the material of stainless steel screws? Because the price mechanism of stainless steel screws, material costs account for a large part, while the material of carbon steel screws stand for a small ratio, are some heat treatment costs or galvanic zinc costs. So the material of stainless steel screws is much more important than other materials.

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2022/11/08

What are the bolts for?

Hardware standard parts, there are some fasteners are called bolts, some fasteners are called screws, and some fasteners are called studs, so what are the differences, they refer to the same product? Is it possible to call a bolt a screw or a stud at will? Today's article, I will mainly call the bolt products listed, do a detailed analysis, so you know what is the bolt, the bolt and what uses, and other products called this screw or stud, I will use a separate article to analyze. We start with the common bolts.

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