INTEGRATED FLANGE SERRATED BEARING FACE PREVAILING TORQUE DIN 6923

Flange Nuts

Self-aligning flange nut with integrated washer face · serrated bearing surface for vibration resistance

Flange nuts feature an integrated circular flange that functions as a built-in washer, distributing clamp load over a larger bearing area. This design reduces surface pressure, minimizes embedding in softer materials, and eliminates the need for separate washer components. The flange face is available with either a plain or serrated bearing surface—serrated flange nuts provide a mechanical locking effect that resists loosening under vibration.

Zhejiang Chance & Union supplies flange nuts in carbon steel, alloy steel, and stainless steel, with property classes 8, 10, and 12. Available in metric and inch sizes, with finishes including zinc plating, hot-dip galvanizing, and plain. Each batch undergoes dimensional verification and torque testing to ensure consistent clamping performance and reliable locking characteristics.

30,000 m²

Facility Area

80+

Cold Headers

800 t

Monthly Output

2,000 t

Warehouse Stock

Key Design Features

Integrated Flange

Built-in washer face eliminates separate components, reduces assembly steps, and prevents lost or misaligned washers. Larger bearing surface protects joint materials from embedding.

Serrated Bearing Face

Optional teeth on the flange surface increase friction against the joint material, providing a locking effect that resists loosening from vibration and dynamic loading.

Precision Thread Form

Rolled threads with consistent class fit ensure reliable torque-tension relationship. Available in coarse and fine thread series, metric and inch standards.

Product Specifications

Parameter	Range / Options
Diameter range	M4 – M48 · 1/4″ – 2″
Thread class	6H (metric) · 2B (UNC) · rolled threads
Flange type	Plain bearing · serrated bearing
Property classes	8 · 10 · 12 · stainless A2/A4
Materials	Carbon steel · alloy steel · stainless 304/316
Finish options	Zinc plated · HDG · plain · phosphate
Standards	DIN 6923 · ISO 4161 · custom

B2B Procurement Advantages

Supply Chain Reliability

Permanent stock of 5,000+ specifications across all flange types
Storage capacity exceeding 2,000 tons ensures continuous availability
24-hour order processing with 3-day shipping for standard items
Custom order lead time: 7–25 days, supporting production planning
80+ cold heading units provide production flexibility and redundancy

Quality Assurance

ISO 9001 and IATF 16949 certified quality systems
100% optical sorting for dimensional accuracy
Full traceability with material test reports and heat numbers
Torque and prevailing torque testing per applicable standards
Ex-factory pass rate: 99.9%

Engineering & Custom Support

With nearly 20 years of industry experience, our R&D team has developed over 1,000 custom fastener solutions for clients across 25 countries. We invest 5% of annual revenue into R&D, focusing on:

Flange geometry optimization: Custom flange diameter, thickness, and serration profile for specific joint designs
Thread development: Non-standard thread lengths and modified profiles for specialized applications
Material selection: Guidance on carbon steel, alloy steel, or stainless steel based on strength, temperature, and corrosion requirements
Prototyping: Rapid sample production for torque testing and assembly validation before volume production

Application Scenarios

Automotive: Engine mounts, suspension components, drivetrain assemblies, and chassis fastening
Heavy machinery: Excavator linkages, mining equipment, and conveyor systems
Industrial equipment: Pump and compressor mounting, gearbox assemblies, and motor bases
Structural connections: Steel framing, bridge components, and seismic bracing
Renewable energy: Wind turbine bolting, solar tracker mechanisms, and hydroelectric equipment

Selection Guide for Procurement

When sourcing flange nuts for production, consider these factors that impact joint integrity and total cost:

Flange type: Plain flange for standard applications where a larger bearing surface is sufficient; serrated flange for applications with vibration or dynamic loading where additional locking is required.
Property class: Grade 8 for general-purpose applications; Grade 10 for higher strength; Grade 12 for maximum load capacity. Stainless steel for corrosion resistance and hygienic environments.
Coating compatibility: Zinc plating for moderate corrosion protection; hot-dip galvanized for outdoor exposure; phosphate for oil retention and enhanced lubricity; plain for painted or coated assemblies.
Thread fit: Class 6H/2B for standard clearance; tighter fits available for applications requiring reduced play.
Standard compliance: DIN 6923 or ISO 4161 for metric applications; custom standards for specific project requirements.

Frequently Asked Questions

What is the advantage of a flange nut over a standard hex nut with a washer?

The integrated flange eliminates the need for a separate washer, reducing part count and assembly steps. It also ensures the washer cannot be lost or misaligned during assembly. The flange provides a larger bearing surface than a standard washer, distributing clamp load more effectively and reducing the risk of embedding in softer materials.

What is the difference between plain and serrated flange nuts?

Plain flange nuts have a smooth bearing surface that provides load distribution without additional locking. Serrated flange nuts feature teeth on the bearing face that increase friction against the joint material, providing a mechanical locking effect that resists loosening from vibration and dynamic loading.

What materials and finishes are available?

We supply flange nuts in carbon steel (property classes 8, 10, 12), alloy steel, and stainless steel (304, 316). Finishes include zinc plating, hot-dip galvanizing, phosphate coating, and plain. Selection depends on strength, temperature, and environmental requirements.

What is your typical lead time for flange nuts?

Standard sizes in stock can ship within 3 days. For custom dimensions, materials, or flange types, lead time is typically 7 to 25 days depending on order quantity and specification complexity. We support both small-batch prototyping and large-volume production orders.

Can you produce flange nuts to non-standard specifications?

Yes. Our R&D team has developed over 1,000 custom fastener solutions. We can accommodate non-standard flange diameters, serration profiles, custom thread sizes, and special material or coating requirements. We provide engineering consultation to optimize flange nut design for your specific application.

Quality Certifications

ISO 9001 · IATF 16949

Quality Metrics

99.9% pass rate · ≤30 min response

Documentation

MTR · torque reports · coating certificates

Company Profile

Fastening Chances, Strengthening Union

Zhejiang Chance & Union Import and Export Co., Ltd. (abbreviated as Chance & Union) is a family-owned China Flange Nuts company under SEA Monies Metal Co., Ltd., inheriting 20 years of family experience and quality heritage in metal manufacturing. Relying on Shengzhao Metal's strong production capacity and supply chain advantages, we specialize in the R&D, production and global sales of high-quality metal products. Adhering to the family's pursuit of precision, rigorous working attitude and long-term commitment, we deliver stable and reliable products and services to customers across the globe.

Leveraging the factory's robust R&D and production capabilities, we specialize in high-strength rivets bolts, nuts, washers, pins, screws, and various non-standard custom parts. As experienced Custom Flange Nuts Suppliers, we provide flexible manufacturing solutions for different customer requirements. Our product range covers materials including stainless steel, alloy steel, aluminum alloy, copper, and special alloys, utilizing processes such as cold heading, hot forging, and CNC machining. Our products are exported to over 25 countries, serving more than 200 clients.

Chance & Union is committed to seamlessly connecting "Manufactured in China" with the international market, providing global customers with one-stop fastening solutions from R&D to mass production through professional technology and exceptional quality.