Threaded inserts are specialized fasteners designed to create strong, reusable threads in materials that cannot support direct tapping—such as plastics, wood, aluminum, or thin sheet metal. By reinforcing the threaded connection, they significantly improve joint strength, durability, and serviceability. Threaded inserts are widely used in automotive, aerospace, electronics, industrial equipment, and furniture manufacturing, providing dependable fastening points where traditional threads would fail.
Understanding Threaded Inserts
Threaded inserts provide internal machine threads within softer or brittle materials. Once installed, they allow bolts or screws to be inserted repeatedly without degrading the base material. This makes threaded inserts essential in applications requiring frequent assembly and disassembly or where the parent material lacks adequate thread strength.
For related blind-thread solutions, see: Rivet Nuts
Types of Threaded Inserts
Helical Inserts (Heli-Coil)
Wire-coil inserts that provide strong, wear-resistant internal threads in metals. Ideal for repairing stripped threads and reinforcing softer alloys.
Key Locking Inserts
Feature mechanical keys that lock the insert in place, preventing rotation and pull-out. Common in high-strength and high-vibration applications.
Press-In Inserts
Designed for plastics and soft metals. Installed by pressing them into prepared holes to form a friction-fit mechanical bond.
Thread-Cutting Inserts
Have cutting slots that allow them to tap their own threads as they are driven into the material, reducing installation steps.
Thread-Molding Inserts
Used in plastic molding operations. Inserted into the mold before injection, becoming an integral part of the finished component.
Materials and Finishes
Threaded inserts are available in steel, stainless steel, brass, and aluminum. To enhance corrosion resistance or improve aesthetics, finishes such as zinc plating, nickel plating, and anodizing may be applied.
For more material options, see:
Material Rivets
Applications of Threaded Inserts
Automotive
Used in engine components, electronics housings, dashboards, and structural attachments requiring repeated servicing.
Aerospace
Provide strong threads in lightweight materials where durability, vibration resistance, and weight reduction are essential.
Electronics
Ideal for small enclosures, mounting points, and assemblies that require reliable fastening without damaging thin casings.
Furniture Manufacturing
Strengthen joints in wood, particle board, and composite materials for improved durability and easier assembly.
Advantages of Threaded Inserts
Enhanced Strength
Reinforces weak materials to support machine screws and bolts securely.
Wear Resistance
Prevents thread stripping and degradation during repeated use.
Versatility
Offered in numerous styles, materials, and sizes to suit nearly any fastening need.
Ease of Installation
Many inserts can be installed with simple hand tools or standard assembly equipment.
Installation Techniques
Installation varies by insert type, but most follow a similar process:
Prepare the Hole
Drill, tap, or mold a hole to match the insert’s specifications.
Install the Insert
Depending on style, the insert may be pressed in, threaded in, molded in, or installed using specialized equipment.
Secure the Insert
Some inserts require heat, torque application, or tool-driven expansion to lock them in place.
Conclusion
Threaded inserts provide durable, reusable threads that significantly strengthen fastening points in materials that cannot support tapped threads alone. Their ability to withstand repeated assembly, enhance load capacity, and prevent material damage makes them indispensable in modern manufacturing. From automotive engineering to electronics and furniture production, threaded inserts ensure long-lasting, reliable connections across a broad spectrum of applications.
