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RS PRO Nylon Backnut, 3/4in


A hex nut, also known as a hexagon nut, hex bolt nut, or hex screw nut, is one of the most widely used types of fasteners. With its 6-sided shape, it’s designed to pair with a bolt or screw to secure components tightly through threaded engagement. Its design offers optimal grip, allowing hex nuts to be easily tightened or loosened from multiple angles using common tools like spanners, ratchets, or wrenches.

They work through a combination of friction on the thread and compression of the parts together. For full engagement, the hex nut should extend at least two threads beyond the bolt, ensuring stability and load distribution. 

To avoid corrosion or loosening, it’s generally recommended to match hex nut materials with those of the bolt or screw, such as using stainless steel nuts with stainless steel bolts.

## **Features & Benefits of Hex Nuts**

Hex nuts are highly valued for their durability, versatility, and ease of use across numerous applications. Their key advantages include:

- They are available in different materials.
- They are available with different finishes.
- They are easy to tighten and loosen.
- They are accessible from 360 degrees due to their shape.

### **Materials & Coatings**

The material and coating of hex nuts contribute to their performance, especially in environments where corrosion resistance, strength, and durability are essential.

- **Stainless Steel:** Known for its high corrosion resistance, stainless steel hex nuts are ideal for outdoor and marine applications where exposure to moisture is common.
- **Brass:** Brass hex nuts offer good corrosion resistance and conductivity, making them suitable for electrical and decorative applications.
- **Steel:** Regular steel hex nuts provide strength and are commonly used in general-purpose applications. However, they may require coatings for rust protection.
- **Zinc Plating:** A popular choice for general-purpose applications, hex nuts with zinc plating offer moderate corrosion resistance, making them suitable for indoor and dry environments.
- **Galvanisation:** Galvanised hex nuts provide superior corrosion resistance and are commonly used in outdoor applications, including construction and infrastructure projects.
- **Phosphate Coating:** This coating is often used for industrial applications where additional rust resistance is required. It also provides a matte finish, which can reduce glare and improve grip.

## **Standards & Specifications**

Hex nuts are manufactured to meet various standards ensuring consistency in quality, fit, and performance. These standards include:

- **ISO Standards:** ISO standards specify the characteristics of hex nuts and the marking and labelling of the product.
- **ASTM Standards:** ASTM standards apply to materials, testing, and quality requirements for hex nuts, particularly in critical applications such as construction and engineering.
- **DIN Standards:** Originating from Germany, DIN standards define precise specifications for hex nut dimensions and tolerances, which are widely adopted in European applications.

## **Hex Nuts Affecting Load Capacity**

Hex nuts help with joint strength and load distribution, especially in high-stress applications. Properly selected and installed hex nuts help secure bolts tightly, maintaining load-bearing capacity.

### **Load Distribution**

As hex nuts spread the load evenly across the bolt and connected surfaces, this helps reduce stress concentration. This distribution is essential for maintaining joint integrity in dynamic applications, such as in machinery or construction frameworks.

### **Joint Strength**

The joint’s overall strength is impacted by the material and coating of the hex nut. Stronger materials like stainless steel provide better support under high torque, while coatings like galvanisation protect against weakening due to corrosion.

## **Hex Nuts vs. Hex Bolts**

While hex nuts and hex bolts are often used together, they serve different purposes and have unique characteristics.

Hex nuts are designed to be used in conjunction with bolts to secure components. They rely on internal threading to create a strong hold when paired with a corresponding hex bolt.

On the other hand, hex bolts, or also referred as [hex socket screws](https://au.rs-online.com/web/c/fasteners-fixings/screws-bolts/socket-screws/), have external threading and are typically used to pass through a hex nut to create a tight assembly. They are commonly used in applications where one end needs to be anchored.

## **Industry Applications**

Hex nuts are widely used across multiple industries due to their reliability and versatility. Some of these applications include:

- **Automotive:** Hex nuts secure various automotive components, including engine parts, frames, and body panels, ensuring stability in high-vibration environments.
- **Construction:** In construction, hex nuts are essential for assembling structural frameworks, scaffolding, and roofing applications. They provide durability and support in demanding outdoor conditions.
- **Machinery and Manufacturing:** These fasteners are used in manufacturing equipment and industrial machinery to fasten critical components securely. Their strong hold and versatility make them suitable for high-stress environments.
- **Electronics:** In electronic devices, hex nuts, particularly brass ones, are often used due to their conductivity and corrosion resistance, ideal for connecting sensitive components.
- **DIY and Home Repairs:** Hex nuts are also popular among DIY enthusiasts for general home repairs, furniture assembly, and other applications where a reliable fastener is required.

## **Your Trusted Hex Nuts Supplier & Manufacturer**

RS is a trusted and widely used supplier and distributor of high-quality hex nuts in Australia. We offer a broad selection of hex nut fasteners, available in metric and imperial sizes, as well as a variety of materials and coatings to suit any application. With options across a range of price points, RS ensures you’ll find hex nuts that meet both your specific requirements and budget. 

Discover our extensive range of hex nuts and other essential components, including [hex keys](https://au.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/hex-keys/), [screwdrivers](https://au.rs-online.com/web/c/hand-tools/screwdrivers-hex-torx-keys/screwdrivers/), and more, at RS Australia today. For more details on our delivery services, please check our [delivery page](https://au.rs-online.com/web/content/support/all-articles/delivery).



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