Essential Knowledge: Bolt Material Selection Guide To Eliminate DIY Project Troubles
Mar 26, 2026
Common bolt materials include the following:
1. Carbon Steel: Carbon steel bolts are the most common type, featuring good strength and machinability. Common carbon steel bolt materials include ordinary carbon steel (such as Grade 4.8, Grade 8.8) and alloy carbon steel (such as 40Cr, 35CrMo, etc.).
2. Stainless Steel: Stainless steel bolts have corrosion resistance and oxidation resistance, suitable for applications in humid or corrosive environments. Common stainless steel bolt materials include 304 stainless steel, 316 stainless steel, etc. Among them, 316 stainless steel has better corrosion resistance than 304 stainless steel and is suitable for harsher corrosive environments.
3. High-Strength Alloy Steel: High-strength alloy steel bolts have higher strength and hardness, suitable for applications that need to bear high loads and vibrations. Common high-strength alloy steel bolt materials include 40CrNiMoA, 42CrMo, etc.
4. Copper: Copper bolts have good electrical conductivity and thermal conductivity, as well as a certain degree of corrosion resistance, often used in electrical equipment and occasions requiring high thermal conductivity.
5. Aluminum Alloy: Aluminum alloy bolts have the characteristics of light weight and corrosion resistance, with a high strength-to-weight ratio, often used in aerospace, automotive and other weight-sensitive fields.
When selecting bolt materials, it is necessary to comprehensively consider factors such as service environment, stress requirements, corrosion resistance, and operating temperature. For special application scenarios, bolts made of special materials such as titanium alloy and nickel alloy can also be selected. It is recommended to consult professionals or refer to relevant industry standards and guidelines according to specific application needs and technical requirements.
In addition to the common bolt materials mentioned above, there are some other common bolt materials as follows:
1. Titanium Alloy: Titanium alloy bolts have low density, high strength, good corrosion resistance and fatigue resistance, as well as excellent high-temperature performance, often used in aerospace, medical equipment and high-end engineering fields.
2. Nickel Alloy: Nickel alloy bolts have excellent corrosion resistance and high-temperature performance, can adapt to harsh chemical and high-temperature environments, and are suitable for chemical, energy, aerospace and other fields. Common nickel alloy bolt materials include Inconel, Hastelloy, etc.
3. Cast Iron: Cast iron bolts are usually used in applications with certain requirements for strength and wear resistance and relatively stable loads, such as mechanical equipment, large structural connectors, etc.
4. Brass: Brass bolts have good corrosion resistance, electrical conductivity and machinability, with an attractive appearance, often used in decoration, furniture and electronic equipment and other fields.
5. Polymer: In some special cases, polymer bolts are also widely used, for example, in applications requiring non-conductivity, excellent corrosion resistance, low friction coefficient or avoiding wear between metals. Common ones include nylon and polytetrafluoroethylene (PTFE) bolts.
It should be noted that when selecting appropriate bolt materials, a comprehensive evaluation and selection should be carried out according to the specific application needs, environmental conditions (such as humidity, corrosion, temperature) and performance requirements. In addition, relevant industry standards and technical guidelines should be followed to ensure that the quality and performance of bolt materials meet the project requirements. If you are not sure what kind of bolt fasteners your project needs, you can consult us.
