5 Factors Related Standard Fasteners Selection: Beginner’s Guide

February 23, 2022
5 factors related standard fasteners selection

Standard fasteners have their own standards unlike custom fasteners.

Standard fasteners are widely used in various fields, such as machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments, chemicals, instruments and end systems, etc.

It is characterized by a wide variety of specifications, different performance uses, and a very high degree of standardization, serialization and generalization.

If you are the beginner of this field, you will be an expert through this guide.

It is mainly manifested in the following 5 aspects.

standard fasteners standards

For non-standard fasteners, which are non-standard parts, detailed drawings are required for new production.

For example, DIN912, the Chinese name is: hexagon socket head screw, which is the name of this product.

However, the most accurate way is to call the standard, because GB70 is also the same name; but the two standards are not consistent in size in many fields.

The most influential standards in the world are: German Standard (DIN), International Standard (ISO), Chinese National Standard (GB), American Standard (ANSI), and Japanese Standard (JIS).

2. Standard Fasteners Specifications

standard fasteners specifications

Generally, the name of the screw is the diameter of the tooth pattern * the length of the screw.

Tooth pattern name diameter, commonly used in metric system: M2, M3, M4, M5, M6, M8, M10, M12, etc.

In American system: 4#-40, 6#-32, 8#-32, 10#- 24, 1/4-20, 5/16-18, 3/8-16, 1/2-13, etc.

The length of the screw refers to the effective length of the embedded object.

For example: countersunk head screws are loaded with the total length, half countersunk head screws add half the length of the head, and cylindrical head screws do not include the head size.

For the specification, the full name is best to add the pitch of thread.

For example, M4-0.7×8, the outer diameter of 4 fingers is 4mm, 0.7 means the distance between the two peaks is 0.7mm, and the effective length of 8 fingers embedded in the loaded object is 8mm.

This is only available in the metric system, and American-made products still need to be marked with pitch of thread.

3. Standard Fasteners Raw Materials

standard fasteners raw materials

Standard fasteners materials are: carbon steel, stainless steel, copper, aluminum, etc.

Carbon steel is further divided into low carbon steel (such as C1008/C1010/C1015/C1018/C1022), medium carbon steel (such as C1035), high carbon steel (C1045/C1050), and alloy steel (SCM435/10B21/40Cr).

Generally, C1008 materials are used for ordinary grade products, such as 4.8 grade screws and ordinary grade nuts; C1015 is generally used for lifting ring screws; C1018 is generally used for machine screws, of course, it is also used for self-tapping screws; C1022 is generally used for self-tapping screws; C1035 hits grade 8.8 screws; C1045/10B21/40Cr hits grade 10.9 screws; 40Cr/SCM435 hits grade 12.9 screws.

Stainless steel material has grade SS302, SS304, SS316, SS904L and SS2205.

However, a large number of SS201 fasteners products are also popular now, and even products with lower nickel content, we call them non-authentic stainless steel products;

Although the appearance of SS201 grade looks similar to other stainless steel, the anti-corrosion performance is much different.

4. Standard Fasteners Strength Grade

standard fasteners strength grade

The strength grade mainly refers to the standard fasteners of carbon steel.

The common strength grades of carbon steel screws are: 4.8, 5.8, 6.8, 8.8, 10.9, 12.9.

The nuts are correspondingly: grade 4, grade 6, grade 8, grade 10, grade 12.

Generally, screws below grade 8.8 are called ordinary screws, while screws above grade 8.8 (including grade 8.8) are high-strength screws.

The difference is that high-strength screws need to be quenched and tempered.

5. Standard Fasteners Surface Treatment

standard fasteners surface treatment

The surface treatment is mainly to increase the anti-corrosion performance of standard fasteners, and some also take into account the color.

Carbon steel fasteners products generally require surface finishing process.

Common surface treatments are: blackening, zinc plating, copper plating, nickel plating, chrome plating, silver plating, gold plating, Dacromet, hot dip galvanizing, etc.

There are many types of galvanized, including blue and white zinc, blue zinc, white zinc, yellow zinc, black zinc, green zinc, etc.

At the same time, it is also divided into environmental protection and non-environmental protection. Each type of coating has a variety of coating thicknesses to meet different salt spray test results.


Clearly, there are other factors to consider when you purchase standard fasteners from China fasteners manufacturers.

The production process, suppliers service, fasteners quality and delivery time will have the huge impact on buyer’s purchasing decisions.

With a proper understanding of every concept in this article, you can easily get a full understanding of standard fasteners selection.


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