Bolts are fundamental components in the world of construction, manufacturing, and various other industries, playing a crucial role in holding structures and objects together. As a bolts supplier, I’ve witnessed firsthand the diverse applications and requirements of different types of bolts. One significant categorization is between structural bolts and non – structural bolts. Understanding the differences between these two types is essential for anyone involved in projects where bolted connections are used. In this blog, I’ll delve into the distinct characteristics, applications, and performance requirements of structural and non – structural bolts. Bolts
1. Definition and General Purpose
Structural bolts are designed and manufactured to carry substantial loads and are used in critical applications where the integrity and safety of the structure are paramount. They are commonly found in building construction, bridges, and heavy machinery. The purpose of structural bolts is to provide a reliable and long – lasting connection that can withstand significant forces, such as tension, shear, and compression, without failure.
Non – structural bolts, on the other hand, are used for less critical applications where the load – bearing requirements are relatively low. These bolts are often used to hold components together in a more general sense, such as in furniture assembly, light – duty machinery, or for attaching decorative elements. They do not have to withstand the same level of stress as structural bolts and are typically used for maintaining the basic structure or functionality of an object.
2. Material and Manufacturing
Material
Structural bolts are usually made from high – strength steel alloys. These alloys are specifically formulated to have excellent mechanical properties, such as high tensile strength, yield strength, and toughness. For example, ASTM A325 and ASTM A490 are two common standards for structural bolts in the United States. ASTM A325 bolts are made from medium – carbon steel, while ASTM A490 bolts are made from a quenched and tempered alloy steel. The high – strength materials ensure that the bolts can handle the large loads encountered in structural applications.
Non – structural bolts can be made from a variety of materials, including lower – grade steels, brass, aluminum, and even plastic. The choice of material depends on the specific application requirements, such as corrosion resistance, cost, and weight. For example, brass non – structural bolts are often used in applications where corrosion resistance is needed, such as in marine environments or for decorative purposes.
Manufacturing
The manufacturing process of structural bolts is more strict and precise compared to non – structural bolts. Structural bolts often undergo heat treatment processes, such as quenching and tempering, to achieve the desired mechanical properties. They also need to meet strict dimensional tolerances and surface finish requirements. Quality control is of utmost importance during the manufacturing of structural bolts, as any defect could lead to catastrophic failure in a structural application.
Non – structural bolts can be manufactured using less – complex processes. For example, cold – heading is a common method for producing non – structural bolts, which is a relatively simple and cost – effective process. The dimensional tolerances and surface finish requirements for non – structural bolts are generally less strict than those for structural bolts.
3. Design and Performance Requirements
Design
Structural bolts are designed based on specific engineering calculations and standards. The design process takes into account factors such as the type of load (tension, shear, or a combination), the size and thickness of the connected members, and the environmental conditions. Engineers use complex formulas and design codes to determine the appropriate size, grade, and installation method of structural bolts.
Non – structural bolts do not require such detailed engineering design. They are often selected based on general guidelines or past experience. For example, in furniture assembly, the size of the non – structural bolt is usually chosen based on the thickness of the wood pieces being joined.
Performance Requirements
Structural bolts have high performance requirements. They must be able to withstand the design loads without yielding or breaking. In addition, they need to have good fatigue resistance, as they may be subjected to cyclic loads over their service life. For example, in a bridge, the structural bolts are constantly exposed to the dynamic loads caused by traffic.
Non – structural bolts have lower performance requirements. They only need to hold the components together securely under normal operating conditions. The fatigue resistance and long – term load – bearing capacity requirements are much less stringent compared to structural bolts.
4. Installation and Testing
Installation
The installation of structural bolts is a critical process that requires strict adherence to specific procedures. Structural bolts are often installed using a calibrated torque wrench or a tension – indicating method to ensure that the proper pre – tension is applied. The pre – tension in the bolt helps to prevent the joint from coming loose under load and ensures the integrity of the connection. In addition, the holes in the connected members need to be accurately drilled to the correct size and alignment.
Non – structural bolts can be installed using more straightforward methods. Hand tools such as screwdrivers or wrenches are commonly used for installing non – structural bolts. There is usually no need to apply a specific pre – tension, and the installation process is less critical compared to structural bolts.
Testing
Structural bolts need to undergo rigorous testing to ensure their quality and performance. This includes tensile testing, shear testing, and hardness testing. Samples are taken from each production batch and tested in a laboratory to verify that they meet the required standards. In addition, on – site inspections and tests are often carried out during the installation of structural bolts to ensure that the installation is done correctly.
Non – structural bolts may not require such extensive testing. In some cases, simple visual inspections may be sufficient to check the quality of non – structural bolts.
5. Cost
Due to the high – grade materials, strict manufacturing processes, and stringent performance requirements, structural bolts are generally more expensive than non – structural bolts. The cost also includes the additional engineering design, installation, and testing required for structural bolts.
Non – structural bolts are more cost – effective, as they are made from cheaper materials and can be manufactured using simpler processes. They also do not require the same level of engineering support and testing, which further reduces the overall cost.
Conclusion
In conclusion, the differences between structural bolts and non – structural bolts are significant in terms of material, manufacturing, design, performance, installation, testing, and cost. As a bolts supplier, I understand the importance of providing the right type of bolts for different applications. Whether you are working on a large – scale structural project or a small – scale DIY project, choosing the appropriate bolts is crucial for the success of your project.
Hex Nuts If you are in need of high – quality bolts, whether structural or non – structural, we are here to assist you. Our experienced team can help you select the right bolts based on your specific requirements and offer professional advice on installation and performance. We take pride in providing top – notch products and excellent customer service. Contact us today to start a procurement discussion and find the best bolt solutions for your projects.
References
- ASTM International. Standards related to structural and non – structural bolts.
- Mechanical Engineering Design textbooks, which cover bolt design and application.
- Engineering handbooks on construction and manufacturing materials.
Handan Jihao Fastener Co., Ltd.
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