Threaded Inserts

Threaded inserts are essential components used to strengthen, repair, or create durable threaded holes in materials such as metal, wood, and plastic. They play a crucial role in repairing damaged threads, enhancing durability, and increasing the load-bearing capacity of joints.

RS Australia offers a broad selection of threaded inserts, including stainless steel threaded inserts and brass threaded inserts, suitable for a wide range of industrial and DIY applications.

Types of Threaded Inserts

Threaded Screw Inserts

Threaded screw inserts are specifically designed to accommodate screws rather than bolts. These inserts are ideal for lighter-duty applications in materials like wood, plastic, and light metals. They are commonly used in scenarios where screws are frequently inserted and removed, protecting the base material from thread damage or stripping over time.

Threaded Bolt Inserts

Threaded bolt inserts provide stronger, more durable threads designed for larger bolts. These inserts are built to handle higher load-bearing applications, making them perfect for metalworking, automotive repairs, and heavy-duty industrial equipment where maximum strength and reliability are required.

Shop Threaded Inserts for Wood, Plastic and Metal Applications

We offer a wide selection of threaded inserts in various materials and finishes to suit your specific needs. Choose from brass, steel, and stainless steel options, available in durable finishes like galvanised and zinc plated to ensure corrosion resistance and longevity. Whether you’re working with wood, plastic, or metal, our range helps you find the perfect insert for your application.

Threaded Inserts for Metal

External thread inserts designed specifically for metal applications.

• Installation: These inserts screw directly into existing threaded holes, providing a reliable repair or reinforcement.
• Benefits: They create a durable, strong connection that withstands heavy use and stress.
• Applications: Commonly used in machinery, automotive repairs, and industrial equipment maintenance.

Threaded Inserts for Wood

Designed to create strong, durable threads in wood materials.

• Installation: Available as press-in or thread-in types. For hardwoods, larger holes may be required, and adhesive can be applied to enhance grip.
• Benefits: Provide secure fastening and help prevent wood from splitting or cracking.
• Applications: Ideal for furniture making, cabinetry, and general carpentry projects.

**Threaded Inserts for Plastic **

Plastics are generally categorised into two main types: Thermoplastic and Thermoset. These have different physical characteristics, so the type of insert and installation method vary accordingly.

• Thermoset: Due to cross-linked polymers during curing, thermoset plastics are easier to mill and drill. For these, press-fit threaded inserts are the best option.
• Thermoplastic: For thermoplastic, installations require heating the metal insert to a specific temperature. Once the desired temperature is reached the threaded insert is pressed onto the plastic. The heat from the metal melts the plastic and the insert fits into the desired position. When the plastic cools, the insert is retained.
• Applications: Used widely in electronic housings, plastic enclosures, and other plastic components.

How to Fit a Threaded Insert

The installation process begins by drilling, milling, tapping, or cutting a hole to the recommended size in the material where the insert will be placed. The second step depends entirely on the type of insert, the material it will be used with and how the insert will be fitted.

Common installation options include:

• Press-fit inserts: Quickly installed by pressing into softer materials like wood or thermoset plastics.
• Thread-in inserts: Screwed into pre-tapped holes in harder materials such as metal or hardwood for a secure and durable fit.

Choosing the right installation method ensures a strong, long-lasting connection tailored to your application.

How to Choose the Right Threaded Insert

Selecting the correct threaded insert involves considering the material, thread size, and the demands of your application to ensure compatibility and durability.

Consider the Material of the Insert and Workpiece

Threaded inserts are available in various materials and finishes to suit every application. Common materials include:

• Brass
• Steel
• Stainless Steel (316 & 302)
• Bright zinc plated
• Clear passivated
• Galvanised
• Plain

For metal parts, choose brass, steel, or stainless steel inserts depending on the required strength and corrosion resistance. Brass or galvanised inserts are ideal for high-corrosion environments, offering reliable protection and longevity.

Select the Correct Thread Size for Your Application

Match the threaded insert size to your existing fasteners and holes to ensure a perfect fit. Common thread sizes include M3, M3.5, M4, M5, M6, M8 and M10

Always confirm that your fasteners and tools are compatible with the chosen thread size to avoid installation issues.

Decide Between Press-Fit or Thread-In Inserts

Choosing the right type ensures optimal performance and reliability for your project.

• Press-fit inserts offer quick and easy installation, making them ideal for softer materials such as wood and certain plastics. They rely on friction to stay securely in place without the need for threading.
• Thread-in inserts provide a more durable and load-bearing solution, designed to be screwed into pre-tapped holes. These are best suited for metal applications and high-stress environments where a strong, long-lasting connection is required.

Mistakes to Avoid when Buying Threaded Inserts

• Incorrect Thread Size Selection: Using the wrong thread size can cause loose fittings, poor load capacity, or damage to both the insert and surrounding material. Always measure accurately and ensure the insert matches the fastener and hole dimensions.
• Overlooking the Installation Method: Not every installation method suits all materials. Press-fit inserts work well in softer materials like wood and plastic but may fail in harder metals. Conversely, threaded inserts are ideal for metal but can cause splitting or cracking in softer woods if not installed correctly.
• Choosing the Wrong Material for the Application: Material choice impacts durability and corrosion resistance. Match the insert material to your environment: brass for corrosion resistance, stainless steel for strength and durability, and zinc-plated steel for cost-effective indoor use.

Common Use Applications of Threaded Inserts

Threaded inserts are widely used across various industries to provide strong, reliable fastening solutions, including:

• Discrete Manufacturing: Used in assembling machinery, equipment, and consumer products that require durable threaded connections.
• Process Manufacturing: Applied in industrial equipment and control systems where maintenance and part replacement demand secure, reusable threads.
• Energy and Utilities: Essential in power generation, transmission equipment, and infrastructure where reliable fastenings withstand harsh conditions.
• Facilities and Intralogistics: Used in building maintenance, conveyor systems, and warehouse equipment for easy repair and robust assembly.

Buy Threaded Inserts at RS Australia

RS is a trusted supplier and distributor of threaded inserts in Australia. We offer a wide range of fastening solutions from leading brands like Böllhoff, POP and AVK. Our competitively priced selection includes inserts for metal, wood, and plastic, supporting diverse applications across manufacturing, maintenance, and repair projects.

In addition to threaded inserts, we also stock components such as cable glands, cable ties, and ferrule connector, making it easy to source everything you need from one place.

Order your threaded inserts and accessories online today and enjoy fast, local delivery or convenient self-collection from your nearest RS branch. For details on placing your order, estimated delivery times, and service fees, please refer to our Delivery Page.