304/316/201 Stainless Steel Flange Hex Nuts, Serrated Anti-Loosening and Anti-Slip Flange Nuts A2-70/A4-80 Grade Conforming to DIN 6923 Standard Suitable for Industrial Fastening

Name: Flange Hex Nut (Serrated Flange Nut)
Material: AISI 304/316 stainless steel (corrosion resistant, rust resistant), 45# steel / 10B21 alloy steel
Standards: GB/T 6177.1, DIN 6923, ISO 4161, EN 1661
Grade: Stainless steel A2-70 (304) / A4-80 (316), carbon steel grade 8 / grade 10
Specifications: M3-M24 (customizable)
Surface Treatment: Natural polishing / Passivation treatment (no coating, corrosion resistant), electro-galvanizing (blue-white zinc/color zinc), hot-dip galvanizing, Dacromet treatment (optional, enhances rust prevention and wear resistance)
Design Features: One-piece flange molding, serrated anti-slip design, high-precision threads, corrosion-resistant stainless steel, easy installation
Applications: Automotive industry, machinery manufacturing, construction engineering, outdoor and marine, general assembly
Delivery Time: 15-30 days after receiving advance payment
Origin: China
Brand: JGD
Minimum Order Quantity: 10,000 pieces, negotiable
Samples: Available
Packaging: Boxed/Bulk/Pallet or customized packaging
OEM: Available

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Key Features

Our flange hex nuts (also known as serrated flange nut, Flange Hex Nut / Serrated Flange Nut) are manufactured from AISI 304/316/201 stainless steel or 45#/10B21 alloy steel, with strength grades covering stainless steel A2‑70 (304), A4‑80 (316) and carbon steel grades 8 / 10. The products are strictly manufactured in accordance with DIN 6923, GB/T 6177.1, ISO 4161 and other standards, with thread sizes M3‑M24 and non‑standard customization available. The core design features an integral flange + bottom serrated anti‑slip structure: the flange replaces a flat washer to distribute pressure and protect the workpiece surface; the serrations bite into the mating surface when tightened, effectively resisting vibration loosening. Ideal for high‑reliability applications such as automotive chassis, mechanical vibration components, outdoor railings, and marine equipment. No extra washers required – simply fit onto a bolt and tighten with a wrench; the flange automatically self‑centers. The 316 stainless steel variant offers salt spray resistance ≥720h, suitable for coastal and humid environments.

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Precision Manufacturing Process

Flange hex nuts are produced using a multi‑station cold heading process. Raw material wire is spheroidized annealed, then fed into a six‑station, six‑blow cold header to simultaneously forge the hexagon shape, flange, and bottom serrations in one operation, ensuring flange‑to‑thread axis perpendicularity ≤0.1mm, with uniform serrations and no burrs. Subsequently, automatic tapping machines with high‑speed spiral point taps (gun taps) cut internal threads, achieving 6H thread accuracy and surface roughness Ra ≤1.6μm.

Carbon steel grade 8 / 10 products undergo mesh‑belt furnace heat treatment (quenching + tempering) to obtain a uniform tempered martensite structure, reaching HRC 22‑32 (grade 8) and HRC 26‑36 (grade 10). Stainless steel A4‑80 receives vacuum solution treatment + passivation. Surface finishing: carbon steel can be electro‑galvanized (blue/white or yellow zinc, 8‑12μm), hot‑dip galvanized (≥50μm), or Dacromet coated (salt spray ≥720h); stainless steel is electropolished. Every batch is 100% inspected by go/no‑go thread gauges, with sample testing for torque‑axial force and vibration loosening performance.

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Transparency & Customization

We maintain full manufacturing transparency: customers can conduct live video inspections of production lines, and request raw material certificates or third-party test reports. Each batch comes with a unique traceability code linking back to coil heat numbers, operators, and inspection data. Customization includes: non-standard dimensions (M4–M30, flange OD/thickness per drawing) with mold tooling in ≤7 days; alternative materials such as 201 stainless steel or 35CrMo (grade 10.9); and surface finishes like Dacromet, Teflon, or Geomet. Minimum order quantity is 10,000 pieces, with 3D drawings and quotes provided within 48 hours. Full traceability is guaranteed.

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Integrated Serrations · Vibration Resistant · Anti-loosening

Stainless steel flange and nuts, DIN 6923 standard, A4-80 grade, salt spray resistance ≥720h. Integrated flange with bottom serrations, anti-loosening and washer-free, suitable for automotive chassis, mechanical vibration, and outdoor marine applications. Factory direct supply, non-standard customization supported.

product details

JGD Service

Manufacturing Process

• Multi Station Cold Heading Technology

• Intelligent Heat Treatment System

• Micron-Level Thread Rolling Process

• Fully Automatic Optical Sorting

• Environmentally Friendly Surface Treatment Line

• Metallographic And Mechanical Joint Laboratory

Quality Control System

• Raw Material Source Locking

• Furnace Number Batch Full Traceability

• Third Party Material Certification

• Process Parameters Open And Transparent

• Salt Spray Test Real Time Monitoring

• International Standard Compliance Declaration

Flexible Customization Capability

• Customizable head/slot Shapes

• Extreme Application Of Special Materials

• Breakthroughs In Extra Large/Long Specifications

• Integrated Assembly Of Components

• Customizable Surface Treatment Colors

• Personalized Packaging And Labeling

Technical Service

• On-Site Failure Analysis

• Selection Calculation And BOM Optimization

• Installation Tool Selection Guidance

• Inventory Management (VMI) Trusteeship

• Free Sample Making And Testing

• International Standard Translation And Interpretation

Multi-Material & Full Strength Series for All-Weather & Corrosion Resistance

Our flange hex nuts are made of AISI 304/316/201 stainless steel or 45#/10B21 alloy steel, with strength grades including stainless steel A2-70 (304), A4-80 (316), and carbon steel grades 8/10. The 316 stainless steel variant offers excellent chloride corrosion resistance, passing ≥720 hours of salt spray testing to withstand coastal and humid environments. Carbon steel options with electro galvanizing, hot-dip galvanizing, or Dacromet coating balance high strength and rust/wear protection. Thread sizes range from M3 to M24 with custom options available, delivering reliable fastening for automotive, machinery, and construction applications.

One-Piece Flange + Serrated Anti-Slip Design for High-Reliability Vibration Resistance

Manufactured to international standards including DIN 6923, GB/T 6177.1, and ISO 4161, our nuts feature an integrated flange and serrated anti-slip base. The flange replaces flat washers to distribute pressure evenly and protect workpiece surfaces, while the serrated teeth bite into the contact surface during tightening to create a mechanical lock against vibration-induced loosening. This dual-protection design ensures stable performance under alternating loads in high-dynamic applications such as automotive chassis and vibrating machinery, eliminating the risk of loosening or dislodgement.

Washerless Quick-Install Design for Efficient & Versatile Assembly

The one-piece structure eliminates the need for separate flat washers, simplifying installation: simply thread the nut onto the bolt and tighten with a standard wrench, with the flange providing automatic alignment. Stainless steel nuts with passivated/polished finishes are suitable for hygiene-sensitive applications without coating contamination, while galvanized carbon steel versions offer enhanced corrosion resistance for outdoor use. Widely applicable in general assembly, construction, and marine equipment, they provide exceptional versatility and assembly efficiency.

Application Scenarios

High-Quality Stainless Steel Flange Nut Display

Precision Fastening, Engineered for the Future – Chengdu Jingguda Trading Co., Ltd., Your Trusted High-Quality Fastener Expert

Chengdu Jingguda Trading Co., Ltd. is a professional fastener manufacturer integrating R&D, production, and sales. We specialize in high-precision, high-strength bolts, nuts, washers, and non-standard customized fasteners, covering international standards such as GB, DIN, ISO, ANSI, and ASME. Equipped with multi-station cold heading machines, high-speed thread rolling machines, fully automated heat treatment lines, and surface treatment equipment, we also operate an in-house laboratory featuring spectrometers, hardness testers, tensile testing machines, and salt spray testers to ensure strict quality control from raw materials to finished products. Our products are widely used in industrial machinery, renewable energy, automotive manufacturing, rail transportation, and more, known for their precision, corrosion resistance, and durability. Committed to “Fast Delivery, Professional Support,” we provide one-on-one customized solutions and efficient logistics, striving to be your ideal partner for reliable connections.

Industrial Capabilities

• Factory Area: 8,000 square meters

• Certifications: ISO, IATF, CE, RoHS, JIS, ASTM

• Manufacturing : 70+ internationally advanced production lines

• Testing: 30+ sets of precision quality testing equipment

• Annual Output: Up to 50,000,000 tons

Integrated Verification System: Ensuring Innovation with "Test Data"

The creative process is not confined to the drawing board. Using our in-house technical center, we provide one-stop verification from corrosion testing to prototype development. Through thorough simulated working condition tests, we use empirical data to confirm the performance stability of customized solutions. This significantly reduces project risks and achieves truly reliable cost reduction and efficiency enhancement.

Innovation Lab:

We are constantly searching for new solutions, and our advancement is driven by knowledge and collaboration. Are you working on a project? Let's get started now.

Collaborative R&D in Full Process: From "Pain Point Diagnosis" to "Customized Implementation"

We provide more than just standard parts. From the beginning, our multicultural engineering team actively contributes to your project. We accurately analyze the application scenario and customize solutions in the lab, seamlessly integrating technology and application, to guarantee that innovative ideas are quickly transformed into practical solutions that reduce overall lifetime costs.

Integrated Verification System: Guaranteeing Innovation with "Test Data"

Rapid Service Response

After confirmation, intelligently schedule production using digital quality control and agile supply chains to reduce bulk order delivery time by 30%. Self-developed molds and flexible production lines are used to complete sampling and delivery within 7 days. You can benefit from market opportunities for both standard bolts and custom-shaped parts with our "Demand-Solution-Sampling-Production" closed-loop solution.