Top Flange Nut Supplier in China

As a premier manufacturer based in China, we specialize in engineering and producing high-performance flange nuts that exceed industry expectations. Our commitment to quality is unwavering, with every nut precisely crafted to meet stringent international standards like DIN 6923 and ISO 4161. Available with serrated or smooth flanges, our nuts provide exceptional clamping force and vibration resistance, guaranteeing unmatched reliability for your most critical assemblies. Partner with a dependable flange nut supplier and ensure your projects are built with superior strength and security.

INSTANT QUOTE

Decades of Expertise

Certified Quality Assurance

Advanced Forging & Machining

Global Standards Compliance

What is a Flange Nut?

A flange nut is a one-piece hexagonal nut with a wide, integrated flange that functions as a built-in, non-spinning washer. This design serves to distribute the clamping pressure of the nut over a wider surface area, which helps prevent damage to the component being secured. The key advantage is the elimination of a separate washer, which streamlines assembly, reduces the part count, and simplifies inventory management. The flange can be plain for simple load distribution or serrated. A serrated flange bites into the mating surface, providing excellent resistance against loosening from vibration. Flange nuts are manufactured in various materials, including carbon steel and stainless steel, and adhere to strict international standards like DIN 6923 to guarantee their performance, safety, and interchangeability in critical applications.

What is a Flange Nut Used For?

Vibration-Resistant Fastening: The serrated flange locks against the mating surface, providing superior resistance to loosening in high-vibration applications like engines, machinery, and automotive assemblies.
Streamlined Assembly: Simplifies and accelerates the manufacturing process by combining the nut and washer into a single component, reducing part count and potential for installation errors.
Load Distribution & Surface Protection: The wide flange spreads the clamping force over a larger area, preventing damage to softer materials and effectively securing joints with oversized or slotted holes.
Automotive & Structural Applications: Used extensively in vehicle frames, suspension systems, and structural steel connections where a strong, secure, and reliable fastener is absolutely critical for safety and performance.

Why Choose Our Flange Nut?

Our manufacturing philosophy is centered on quality and precision. We combine advanced cold-forming techniques with rigorous quality control to produce flange nuts that consistently meet strict industry standards for strength, fit, and operational reliability.

Premium Material Selection

Our process begins with sourcing certified, high-grade steel. This ensures every flange nut possesses superior hardness and tensile strength, providing a secure and dependable hold for your most critical applications.

Exceptional Durability

From standard carbon steel to corrosion-resistant stainless steel and zinc-plated options, our products are built to withstand wear, rust, and harsh environmental conditions for a long service life.

Precision Threading

Utilizing state-of-the-art threading equipment, we guarantee clean, consistent threads on every nut. This precision ensures a smooth, non-galling fit and accurate torque application for reliable performance.

Advanced Locking Design

We offer flange nuts with optimally engineered serrations. This locking design bites into the mating surface to provide maximum resistance against loosening caused by vibration, ensuring joint integrity.

What Is The Difference Between Nut And Flange Nut?

Design & Structure: A standard nut is purely hexagonal, while a flange nut features an integrated, circular washer (flange) at its base.
Load Distribution: The flange provides a larger bearing surface area, distributing clamping pressure more evenly than a standard nut, which helps protect the mating surface from damage.
Assembly Efficiency: Flange nuts eliminate the need for a separate flat washer, reducing the number of parts required and speeding up the assembly process.
Locking Features: Flange nuts are often available with serrations on the flange base, providing enhanced resistance to loosening from vibration—a feature not standard on regular hex nuts.

How To Choose The Right Flange Nut For Your Application?

Determine Material & Finish: Select the material (e.g., Carbon Steel, Stainless Steel) and coating (e.g., Zinc Plating) based on the environmental exposure to ensure corrosion resistance and desired longevity.
Select The Correct Grade: Identify the required strength grade or property class (e.g., Class 8, Grade 5) to ensure the nut is compatible with the bolt strength and the application's load requirements.
Evaluate Flange Type: Choose between a smooth flange for general load distribution or a serrated flange if the assembly will be subject to vibration and requires a locking mechanism.
Verify Size & Standards: Ensure the flange nut matches the bolt's diameter and thread pitch (Metric or Imperial) and adheres to relevant industry standards (e.g., DIN 6923, ISO 4161).

Explore Our Types of Flange Nuts

Serrated Flange Nuts

The premier choice for high-vibration environments, the serrated flange nut features sharp locking teeth under its base. When tightened, these serrations bite into the mating surface, creating a powerful anti-loosening effect that eliminates the need for a separate lock washer. It is the ideal fastener for engines, industrial machinery, and automotive applications.

Smooth Flange Nuts

Also known as a plain flange nut, this versatile fastener provides excellent clamping force without a locking feature. Its key advantage is the wide, flat bearing surface which distributes the load evenly to prevent damage to the component being secured. It is perfectly suited for applications with oversized holes or when fastening against soft materials.

12-Point Flange Nuts

Designed for high-performance and high-torque applications, the 12-point flange nut features a bi-hexagonal head. This design allows for greater tool engagement, enabling higher clamping forces while reducing the risk of stripping the head in tight spaces. It is the mandatory choice for performance engines, aerospace, and other critical, high-stress assemblies.

Nylon Insert Flange Nuts

This self-locking nut combines the load-distributing benefit of a flange with the proven reliability of a nylon insert. As the bolt threads pass through the nylon collar, it deforms and creates a tight, frictional grip that resists loosening from vibration. This design provides a secure lock without marring the mating surface, making it ideal for reusable connections.

Nominal Size (M)	Thread Pitch (mm)	Width Across Flats (mm)	Flange Diameter (mm)	Total Height (mm)
M5	0.8	8	11.8	5.1
M6	1	10	14.2	6
M8	1.25	13	17.9	8
M10	1.5	15	21.8	10
M12	1.75	18	26	12
M14	2	21	29.9	14
M16	2	24	34.5	16
M20	2.5	30	42.8	20

The data above is for reference purposes for standard DIN 6923 serrated flange nuts. We manufacture a full range of flange nuts covering metric and imperial sizes and comply with various international standards including ISO 4161 and IFI. For complete technical data sheets or custom requirements, please contact our engineering team.

Key Flange Nut Application Industries

Automotive Industry

Essential for vehicle assembly, securing engine mounts, chassis components, and suspension systems where their resistance to constant vibration is critical for safety and reliability.

Heavy Machinery & Construction

Applied extensively in construction and agricultural equipment to fasten frames, hydraulic systems, and attachments, providing a robust hold that withstands extreme shock and operational stresses.

Industrial Assembly & Automation

Used in conveyor systems, assembly lines, and robotic equipment. The one-piece design speeds up production while the locking flange ensures long-term joint integrity.

Structural & Racking Systems

Ideal for constructing metal frames, industrial shelving, and support structures. The wide flange distributes load effectively and prevents loosening, ensuring the stability and safety.

Why Choose Our Flange Nut?

Advanced Cold-Forming Technology: We utilize state-of-the-art cold-forming processes to manufacture flange nuts with superior grain structure and exceptional strength, ensuring maximum durability and resistance to stripping.
Rigorous Quality Assurance: Our ISO 9001 certified system mandates strict testing for thread tolerance, hardness, and serration effectiveness, guaranteeing every nut provides a secure and reliable lock.
Broad Material & Standard Compliance: We produce flange nuts in high-tensile carbon steel, stainless steel, and with various protective coatings, all adhering to major international standards like DIN 6923 and ISO 4161.
Optimized Locking Performance: Our serrated flange nuts are engineered with a precise tooth design that delivers maximum resistance to vibration, ensuring your critical joints stay tight in the most demanding applications.
Extensive Stock & Rapid Delivery: We maintain a comprehensive inventory of all standard metric and imperial sizes, enabling us to provide fast, dependable delivery to keep your projects on schedule.

What Our Client Says

Understand from our clients what they say about doing business with us and the unique value addition we provide.

"We switched to their serrated flange nuts on our heavy machinery assembly line. The locking grip is incredible, and we've seen a dramatic decrease in fastener-related failures from vibration. The product's consistency and strength give us complete confidence in our final build quality."

Alex Patel

LEAD MECHANICAL ENGINEER

"The one-piece design of these flange nuts has streamlined our production process, saving significant time by eliminating the need for separate washers. Their team is highly professional, and the product quality is always consistent. A reliable supplier that we depend on for all our fastening needs."

Jessica Brown

PROCUREMENT DIRECTOR

Comprehensive Guide to Flange Nut

What are the advantages of flange nuts?

The primary advantages of flange nuts are faster assembly due to their one-piece design and superior load distribution from the wide flange, which protects the mating surface. Serrated versions offer the added benefit of excellent resistance to loosening caused by vibration.

What is the difference between cone and flange lug nuts?

The key difference is the seating surface. Cone lug nuts have a tapered seat designed to center and secure a wheel with matching conical holes. Flange lug nuts have a flat base with an integrated washer that sits flush against a flat wheel mounting surface. Using the wrong type can be unsafe.

What is the purpose of a flange nut?

The purpose of a flange nut is to act as both a nut and a washer. Its integrated flange distributes the clamping force over a wider area to prevent damage to the fastened material. If serrated, it also serves the critical purpose of creating a locking mechanism to resist loosening from vibration.

How to remove a flange nut?

To remove a flange nut, use a correctly sized socket or spanner and turn it counter-clockwise. For serrated nuts, you may need to apply extra initial force with a breaker bar to overcome the locking grip of the serrations. Once broken loose, it should unscrew like a standard nut.

Can you reuse flange nuts?

For critical applications, reusing flange nuts, especially serrated types, is not recommended. The serrations become dull after the first use, significantly reducing their anti-vibration locking ability. For non-critical joints, reuse may be possible, but it’s always safest to use a new nut.

Latest Blog Posts

Maintain Inventiveness by Following The Blog for the Latest Best Practices, Techniques, Innovations, and Insights in the Field.

What is the Difference Between Flange Nut and Lock Nut

When it comes to fastening, choosing the wrong kind of nut can compromise everything. There are thousands of nuts on the market that differ simply because of their design...

August 5, 2025

Lap Joint Flange vs Slip On Flange: When to Use & Weld Necks

Selecting the appropriate flange type for piping systems means the difference between operating smoothly and suffering costly delays. There are numerous types of flanges, but lap joint and slip-on...

July 24, 2025

Do Flange Nuts Require Washers? Understanding Flange Nuts and Their Applications

When building machinery or fastening components, the choice of hardware could have a significant bearing on performance, durability, and ease of operation. Because of their distinct design, flange nuts...

August 4, 2025

How to Identify Weld Neck Flange: Types, Uses, and Wall Thickness Explained

Weld Neck Flanges are defined by a strong build that gives them durability in hostile environments, making them imperative components in several industries. This work primarily acts as an...

July 22, 2025

What is the Difference Between Slip-On and Weld Neck Flange?

Choosing the right type of flange is crucial for the piping and engineering systems so as to retain their structural integrity and reliability in operation throughout their life. Among...

July 17, 2025

Slip On vs Socket Weld Flanges: Welding Differences

For your piping system, occasionally the choice narrows to a slip-on and a socket-weld flange. Both commonly find application in industrial setups and, yet, are majorly different in design,...

July 25, 2025

How do I select the right Flange Manhole?

Selection of the appropriate flange manhole is critical for the successful operation, safety, and long service life of many industrial systems. The question arises as to what considerations come...

July 30, 2025

How Do Blind Flanges Work: Everything You Need to Know About Blind Flanges

Blind flanges are very important aspects for piping engineering yet seldom draw attention to themselves due to their utmost requirements. Blind flanges are mounted in various instances in oil...

July 29, 2025

Partner With a Trusted Flange Nut Supplier

With decades of manufacturing experience and a commitment to quality, we are your reliable partner for all flange nut requirements. From standard serrated nuts to complex custom designs, our team is here to provide the high-performance fasteners and expert service you need to succeed. Contact us today to discuss your project.

Get in Touch Today

Frequently Ask Questions

Q: How does a serrated flange nut provide its locking action?

A: A serrated flange nut has sharp, angled teeth on the underside of its flange. When tightened, these serrations dig into the material surface, creating a powerful frictional grip that acts as a locking mechanism to prevent the nut from backing off due to vibration.

Q: Why is a flange nut standard important?

A: Adhering to a flange nut standard like DIN 6923 or ISO 4161 is critical because it governs key dimensions, thread tolerances, and material strength. This ensures consistency, interchangeability, and reliable performance across different manufacturers and applications.

Q: What should I look for in flange nuts suppliers?

A: When choosing from flange nuts suppliers, look for a company with ISO quality certifications, the ability to provide material traceability reports, a wide range of standard and custom products, and a strong reputation for consistent quality and reliable delivery.

Q: Can I use a flange nut on a painted or soft surface?

A: For painted or soft surfaces where marring is a concern, a smooth (non-serrated) flange nut is the best choice. A serrated flange nut will dig into and damage the surface to achieve its lock, which may not be desirable in these applications.

Q: Is there a difference between a "flange lock nut" and a "serrated flange nut"?

A: A serrated flange nut is a specific type of flange lock nut. The term “flange lock nut” is a broader category that can also include other locking designs, like nylon insert flange nuts, while “serrated” refers specifically to the locking teeth on the flange.

Q: Can I use a flange hex nut to replace a standard nut and washer?

A: Absolutely. The primary purpose of a flange hex nut is to replace a standard nut and washer combination. This reduces part count, simplifies inventory, and speeds up assembly, making it a more efficient fastening solution.

Q: Do swivel flange nuts provide a locking feature?

A: Typically, standard swivel flange nut assemblies do not provide a locking feature themselves, as their main purpose is alignment. For applications requiring both alignment and vibration resistance, they would need to be used in conjunction with a separate locking mechanism, such as a thread-locking adhesive.

Q: What is the most common type, a flange hex nut?

A: Yes, the flange hex nut is the most common form. It combines a standard six-sided hexagonal nut with an integrated, non-spinning washer (flange) at its base. This one-piece design simplifies assembly and is compatible with standard tools.

Top Flange Nut Supplier in China

What is a Flange Nut?

What is a Flange Nut Used For?

Why Choose Our Flange Nut?

Premium Material Selection

Exceptional Durability

Precision Threading

Advanced Locking Design

What Is The Difference Between Nut And Flange Nut?

How To Choose The Right Flange Nut For Your Application?

Explore Our Types of Flange Nuts

Serrated Flange Nuts

Smooth Flange Nuts

12-Point Flange Nuts

Nylon Insert Flange Nuts

Flange Nut Specifications Chart

Key Flange Nut Application Industries

Automotive Industry

Heavy Machinery & Construction

Industrial Assembly & Automation

Structural & Racking Systems

Why Choose Our Flange Nut?

What Our Client Says

Comprehensive Guide to Flange Nut

What are the advantages of flange nuts?

What is the difference between cone and flange lug nuts?

What is the purpose of a flange nut?

How to remove a flange nut?

Can you reuse flange nuts?

Latest Blog Posts

Partner With a Trusted Flange Nut Supplier

Frequently Ask Questions

Q: How does a serrated flange nut provide its locking action?

Q: Why is a flange nut standard important?

Q: What should I look for in flange nuts suppliers?

Q: Can I use a flange nut on a painted or soft surface?

Q: Is there a difference between a "flange lock nut" and a "serrated flange nut"?

Q: Can I use a flange hex nut to replace a standard nut and washer?

Q: Do swivel flange nuts provide a locking feature?

Q: What is the most common type, a flange hex nut?

Products

Useful Links

Contact Form

Contents