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Sanwei:Your Professional Flange Nuts Manufacturer!

Hebei Sanwei Fasteners Co., Ltd. is a high-tech enterprise specializing in the research, development, production, and sale of fasteners, located in Hebei Province, China. Since its establishment,wei has been committed to providing customers with high-quality, high-performance fastener solutions, which are widely used in various fields such as construction, machinery manufacturing, automobile, and power communication.

Hex Flange Nut
Standard: DIN6923. Name: hexagonal flange nuts. Material: carbon steel and alloy steel, etc.. Grade: 4.8 grade, 5.8 grade, 8.8 grade
Flange Bolts And Nuts
Standard: DIN6921. Name: Flange bolts and nuts. Material: Carbon steel and alloy steel, etc.. Grade: Grade 4.8, 5.8, 8.8
Serrated Flange Nut
Standard: DIN6923. Name: Serrated flange nuts. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, Grade 5.8, Grade 8.8
Flange Lock Nut
Standard: DIN1664. Name: Flange Lock Nut. Material: carbon steel and alloy steel, etc.. Grade: Grade 4.8, Grade 5.8, Grade 8.8, Grade 10.9

Why Choose Us

OEM/ODM Service
Our customised fasteners are made to your special requirements. It can be fully threaded or partially threaded, and the thread, driving method, material, length, head shape, plating and all these can be specially designed according to your needs.

Good CNC machining technology
From material selection to finished products, Handan Sanwei provides you with comprehensive solutions when it comes to customised fasteners. The fasteners we make are high precision and strong. No matter what kind of precision you need, we can meet it and guarantee your satisfaction.

Strong engineering design team
Our company has an excellent and professional engineering team, and a number of technicians are elites in the industry. The staff always strives to explore new methods and technologies. From the selection of metals and special alloy materials to the finished fasteners, we can solve all aspects of the whole project engineering.

Professional Testing Laboratory
Quality assurance and testing is an important part of producing fasteners. Handan Sanwei has a specialised quality testing laboratory with spectrometers, hardness testers, tensile testers, salt spray test chambers and other equipment, where raw materials and final products are strictly tested. In addition, the company also has experienced testing experts who use professional methods to comprehensively test the fasteners and finally give you a detailed test report.

Digital Quality Control System
We rely on our self-developed full-process digital quality inspection system to strictly control every step from raw materials entering the factory to finished products being shipped. This system will always monitor the quality of the products to ensure that each batch of products meets the industry standards and complies with customer requirements. In addition, it collects and feeds back data in real time, giving you a clear understanding of product quality.

Advantages of Flange Nuts

Load Distribution:
The flange provides a larger bearing surface, helping to distribute the clamping load more evenly. This helps prevent damage to the material being fastened and reduces the risk of over-tightening, especially in delicate materials.

Vibration Resistance:
Flange nuts are particularly effective in environments where vibrations are a concern. The flange creates a locking effect that reduces the chances of the nut loosening over time, making them ideal for automotive, machinery, and other high-vibration applications.

Alignment Assistance:
The flange helps in aligning the fastener during installation. This feature simplifies the positioning of the nut, ensuring accurate placement and reducing installation time.

Sealing Properties:
In some applications, the flange nut also acts as a seal, preventing moisture, dust, or other contaminants from entering the joint and compromising its integrity.

Ease of Installation:
The integrated washer design of flange nuts simplifies the installation process. By eliminating the need for a separate washer, these fasteners reduce the number of components required, speeding up the assembly process. This streamlined installation is particularly beneficial in large-scale projects and high-volume production settings.

Corrosion Resistance:
Flange nuts are available in materials like stainless steel, brass, and nylon, which offer excellent corrosion resistance. This makes them ideal for harsh environments, like marine and chemical industries, where traditional fasteners might corrode.

Enhanced Clamping Force:
Flange nuts provide better clamping force due to their larger footprint compared to traditional nuts. This increased clamping force is particularly useful in applications with oversized holes, ensuring a secure and stable connection even under high loads.

Reduced Component Count:
By integrating the washer, flange nuts reduce components, lower costs, and minimize installation errors. This simplification not only reduces costs but also improves overall efficiency.

Application Versatility:
Flange nuts are versatile, used across industries like automotive, aerospace, construction, and machinery, providing secure connections in various conditions.

Specification

Standard	DIN
Name	Serrated flange nuts
Material	Carbon steel and alloy steel, etc.
Grade	Grade 4.8, Grade 5.8, Grade 8.8
Nominal Diameter	M2-M48
Pitch	0.4-5
Surface treatment	ZP,YZ,BLACK

Application of Flange Nuts

Automotive and Aerospace Applications

Automotive Applications: Flange nuts are commonly found in chassis assemblies, where their integrated washer design helps distribute load efficiently, reducing surface damage and simplifying installation.

Aerospace Applications: Flange nuts, particularly all-metal types, are used in landing gear assemblies and airframe joints, where high load distribution and corrosion resistance are essential.

Construction and Manufacturing Applications

Construction Industry: Flange nuts are crucial in building and infrastructure projects for assembling steel frameworks, bridges, and large structures. Their built-in washer design helps distribute load efficiently, reducing the risk of deformation and enhancing joint reliability.

Manufacturing Applications: High-speed assembly lines benefit from flange nuts due to their ease of installation, which reduces assembly time and parts count.

Heavy Machinery and Equipment

Agriculture: In agricultural machinery, flange nuts help secure components like plows and harvesters, distributing load evenly and preventing wear on softer materials.

Energy Sector: Power generation equipment, such as turbines and windmills, requires fasteners that can handle dynamic forces and environmental exposure. Flange nuts are favored for their corrosion resistance in outdoor environments.

Industrial Equipment and Machinery

Machinery Assemblies: Serrated flange lock nuts are widely used in rotating machinery, such as compressors and pumps, to prevent vibrations from loosening standard fasteners.

High-Temperature Environments: In furnaces, boilers, and engines, Tri-Loc nuts are preferred for their all-metal construction and resistance to thermal expansion, ensuring secure fastening even in extreme heat.

Types of Flange Nuts

There are several types of flange nuts, each designed for specific applications. The two most common types are:

Serrated Flange Nuts: These flange nuts have serrations (small ridges or teeth) on the underside of the flange. The serrations grip the surface of the material, providing increased resistance to loosening due to vibrations. Serrated flange nuts are often used in automotive and machinery applications. See specifications below.

Non-Serrated Flange Nuts: Unlike serrated flange nuts, non-serrated flange nuts have a smooth underside. They are commonly used in applications where marring or damaging the surface of the material is a concern. See specifications below.

Bolts Used with Flange Nuts

Flange nuts are typically used with bolts or threaded fasteners that have a compatible thread pitch and size. The choice of bolt depends on the specific application's requirements. Common types of bolts used with flange nuts include:

Hex Head Bolts: Hexagonal head bolts, often referred to as hex bolts, are a common choice when paired with flange nuts. They provide a sturdy and reliable connection and are widely used in construction, machinery, and structural applications.

Socket Cap Screws: Socket cap screws are another option when using flange nuts. They have a recessed hexagonal socket in their head, allowing for secure tightening with an Allen wrench or hex key. Socket cap screws are often used in precision equipment and machinery.

Carriage Bolts: Carriage bolts have a round head with a square shoulder just beneath it. Flange nuts are used with carriage bolts when a smooth and finished appearance is desired. These are commonly found in outdoor furniture and wooden structures.

Stud Bolts: In applications where flange connections are prevalent, stud bolts and flange nuts are used together to create a reliable and leak-proof joint. This combination is commonly employed in the oil and gas industry for connecting pipelines and flanges.

Installation Best Practices for Flange Nuts

To maximize the performance and reliability of flange nuts, adhering to installation best practices is crucial:

Cleaning the Surface

Before installation, ensure that the surfaces to be joined are free of dirt, grease, and contaminants. This promotes better contact and load distribution.

Proper Torque Settings

Utilize a torque wrench to apply the correct torque as specified by the manufacturer. This prevents over-tightening, which can damage components, or under-tightening, leading to loosening.

Inspecting the Components

Always inspect flange nuts and the connected surfaces for signs of wear or damage before installation. Replacing worn components enhances overall reliability.

Packaging and Shipping

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FAQ

Q: I need a customized fastener, but it's not on your website. What do I do?

A: Please send us your request with detailed drawings or photos, then we will make the quotation for you accordingly.

Q: In general, how long can delivery be made after receiving an order?

A: Regular orders can be completed and shipped within 15-20 working days after receiving the deposit and confirming product details.

Q: During the product usage process, if we encounter technical problems, can you provide technical support?

A: Sure. We have a professional technical team that can provide you with technical consultation and guidance through methods such as telephone, email, or video conference.

Q: What is the packaging method of the product?

A: 50KG bag and pallet.

Q: Are flange nuts and washers interchangeable?

A: Not necessarily. Flange nuts contain an integrated washer flange so they can often serve the same purpose of spreading load as a separate washer. However, there are applications where one item may be better suited than the other.

Q: Do you need a washer with a flange nut?

A: Usually not, since the flange acts as a washer surface. However, in some cases using an additional thin lower washer can help compensate for an uneven fastening surface.

Q: What’s the difference between a flange nut and lock nut?

A: A flange lock nut combines the flange surface of a flange nut with a nylon locking element that resists vibration loosening. Lock nuts don’t have a flange.

Q: Are flange nuts reusable?

A: Flange nuts become damaged during removal so they generally should not be reused. The integrated flange gets marred by wrenches so its integrity is compromised.

Q: How does a flange nut work?

A: The integrated washer of a flange nut works in the same way as a standard washer, providing a greater area to distribute the nut's pressure over the part being secured. If the flange has serrations, these serrations bite into the material installed, making the nut less likely to loosen over time due to vibrations.

Q: How do you install a flange nut?

A: First, check whether the position of the nut support surface on the back of the hexagonal flange should be parallel and smooth. If there are scratches, nicks, mud, corrosion and burrs, the flange nuts must be replaced or reworked. When installing the hex nut flange, first find the hole where the nut can be installed, then align the hole and insert it, and then slowly turn it clockwise until it is tightened.

We're professional flange nuts manufacturers and suppliers in China, specialized in providing high quality products and service. We warmly welcome you to wholesale customized flange nuts made in China here from our factory. Contact us for quotation.

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