Principles of selection of fastener bolts nuts

Principles of selection of fastener fastener bolts nuts

Fasteners are a kind of connection often used in industrial manufacturing structure connections; they are mainly used for two or more parts by fixing, connecting, clamping, or sealing each other firmly linked together. For different application scenarios and requirements, we need to choose the correct fasteners to ensure the firmness and stability of the connection. The following are some principles of fastener selection:

1. Load requirements: The selection of fasteners should consider the load requirements between the connected parts. The load can be static, dynamic, or impact. According to the actual situation, select the appropriate fastener materials and specifications to ensure sufficient strength and withstand the load capacity.

2. Working environment: different working environments have different requirements for fasteners. For example, if the fastener is used in a high-temperature environment, high temperature should be selected to withstand high-temperature materials; if used in corrosive environments, it should be chosen to have the ability to be corrosion-resistant materials, such as stainless steel and so on.

3. Connection method: Select the appropriate fasteners, such as threaded connections, key connections, and spring connections, according to the characteristics of the connected parts and the requirements of the connection method.

4. Installation and maintenance requirements: different fasteners require different installation and maintenance methods. Fasteners should be selected for easy installation and maintenance to improve efficiency and reduce maintenance costs.

5. Economy: The economy should also be considered when choosing fasteners. Select the appropriate fastener materials and specifications according to the actual needs to avoid excessive design, which can lead to cost waste, and to ensure the reliability of the connection.

6. Standardization and normalization: The selection of fasteners should follow the relevant national and industry standards to ensure that the quality and performance of fasteners meet the specified requirements. Following the standardization and normalization of the selection principle can improve the interchangeability and versatility of fasteners and reduce maintenance difficulties.

7. Durability: Fasteners need to have a certain degree of durability to maintain the stability of the connection in the long-term use of the process to prevent loosening and wear. Therefore, when selecting fasteners, one should consider their durability and life and choose durable fasteners.

8. Loosening resistance: fasteners are easy to loosen in the working process, so choosing fasteners with good loosening resistance is essential. You can choose to have a damper, washers, and other additional structures of the fastener to increase the stability of the fastener and anti-loosening performance.

In short, the selection of fasteners should be based on the actual needs and requirements, taking into account the load requirements, working environment, connection mode, installation and maintenance requirements, economy, standardization and normalization, durability and anti-loosening, and other factors. It should also follow the relevant standards and norms to ensure firmness, stability, and reliability.

Stainless Steel Flanged Hex Head Screws for Wood: These 316 stainless steel screws have excellent resistance to chemicals and salt water and are a good choice for ACQ-treated (arsenic-free) lumber. The flange reduces the risk of crushing material, and the hex head provides a secure grip with a wrench. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. Screws may be mildly magnetic. Head height includes the flange. Length is measured from under the head.

Metric 18-8 Stainless Steel Button Head Hex Drive Screws: Made from 18-8 stainless steel, these button head screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head.

Passivated stainless steel screws provide added protection against oxidation and corrosion.

Black-oxide stainless steel screws have a matte-black finish.

18-8 Stainless Steel Pan Head Phillips Screws:18-8 stainless steel pan head screws have good chemical resistance and may be mildly magnetic. Length is measured from under the head. For partially threaded screws, thread length may vary from the minimum thread length published to fully threaded.

Passivated stainless steel screws provide added protection against oxidation and corrosion.

Chrome-plated stainless steel screws have a decorative, mirror-like finish.

PTFE-coated stainless steel screws won’t stick or bind as you thread them into a hole.

Black-oxide stainless steel screws have a matte-black finish.

JIS Stainless Steel Pan Head Screws: Made to Japanese Industrial Standards, these screws have narrower and shorter heads than standard Phillips pan head screws. They are chemical resistant and may be mildly magnetic. Length is measured from under the head.

18-8 Stainless Steel Extra-Wide Truss Head Phillips Screws:18-8 stainless steel screws have good chemical resistance and may be mildly magnetic. These screws have an extra-wide truss head that distributes holding pressure to reduce the likelihood of crushing thin material. Length is measured from under the head.

Passivated stainless steel screws have added protection against oxidation and corrosion.

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