Hex Flange Nut

As a factory with 19 years of experience in fastener manufacturing, we understand the importance of Hex Flange Nuts in the industrial, machinery, and automotive sectors. It's not just an upgraded version of a regular nut, but a high-performance fastener that combines stability, anti-loosening properties, corrosion resistance, and ease of installation.

Raw Material

Cold Forging

Threading

Auto Lathe

Auto Lathe

Table Lathe

CNC Lathe

Quality Checking

Inspection

Packing

What is a Hex Flange Nut?

A Hex Flange Nut is a nut that resembles a traditional hexagonal nut in shape, but with an integrated flange at the bottom. This structure significantly improves anti-loosening performance, increases the stress-bearing area, and reduces damage to the workpiece surface, making it a functional fastener that conventional nuts cannot replace.

Product Features

1. Integrated Flange Structure

Increased Stress-Bearing Area: The flange diameter is larger than the opposite dimensions of the nut, significantly increasing the contact area with the workpiece and resulting in more even load distribution.

Prevents Indentation on Workpiece Surface: Traditional nuts may leave indentations or scratches after tightening. The flange base reduces localized stress concentration, protecting surface coatings or substrates.

Replaces Washers: Reduces installation steps, lowers labor costs, and improves production line efficiency.

Prevents nuts from sinking into soft materials: Particularly suitable for soft workpieces such as wood, plastic, and thin sheets.

Suitable applications: Metal structure assembly, automotive chassis, impact and vibration equipment, etc.

2. Anti-slip design with serrated teeth:

The serrations are arranged radially outwards: When tightening, they "bite" into the workpiece surface, creating a mechanical locking effect. Stable locking force is maintained even under continuous strong vibration conditions.

Prevents nut reverse rotation: The toothed structure has an anti-reverse function, reducing the risk of loosening by approximately 3–5 times.

Increased coefficient of friction: Reduces the probability of nut loosening, especially suitable for: High-frequency vibration equipment, automotive suspension systems, motorcycle engine housings, and transmission and conveying machinery.

Longer service life: Less prone to fatigue failure than spring washers, suitable for long-term use.

3. High-Strength Structure and Material Selection

Common materials include:

Carbon Steel (Class 8/10/12)

High tensile strength

Suitable for high-load mechanical connections

High cost-effectiveness

Stainless Steel 304/316

304 Suitable for most outdoor equipment

316 Suitable for chemical, seawater, and severe salt spray environments

Corrosion resistance far superior to conventional electroplated products

Alloy Steel

Used for high-temperature, high-torque, and high-fatigue environments.

Performance parameters include:

Tensile strength: 600–1100 MPa

Hardness grade: HRC 26–36 (depending on material)

Coarse/fine thread options available

4. Multiple Surface Treatments

Different corrosion resistance levels are available depending on the environment.

Common Surface Treatments:

Zinc Plating (White Zinc / Color Zinc / Blue-White Zinc)

- Moderate rust resistance, suitable for indoor equipment.

Hot-Dip Galvanizing (HDG)

- Zinc layer thickness up to 40–80μm

- Strong corrosion resistance, used for outdoor/building structures.

Dacromet

- Superior salt spray resistance, up to 800–1200 hours

- Commonly used coating in the automotive industry.

Black Oxidation

- Moderate corrosion resistance, but strong mechanical appearance.

Nickel Plating, Chromium Plating

- Used for precision equipment or applications with high aesthetic requirements.

Stainless Steel Original Color

- No electroplating required, inherently corrosion-resistant.

5. Faster Installation

20%–30% faster installation compared to ordinary nut + washer combinations.

Advantages include:

* Installation requires only a hex wrench

* No need to determine washer orientation (saves time)

* Reduces the risk of missing or dropped parts

* Increases assembly speed in assembly line production.

Ideal for automotive factories, machinery production lines, and equipment assemblers.

6. Excellent Vibration Resistance

The toothed flange provides mechanical locking: withstands periodic vibrations/shocks.

Increased contact area at the flange bottom: improves clamping force stability.

High thread precision and low loosening rate: suitable for continuous and alternating load environments.

7. Compatible with Multiple Thread Specifications

The following thread types are available:

Metric threads (M5–M24)

American standard threads (UNC/UNF)

Coarse/Fine threads

Customizable thread tolerances (6H/6G)