The Ultimate Guide to Choosing the Right Threaded Insert for Plastic Applications

March 27th, 2024By E-Z Lok

Threaded inserts for plastic offer robust, reusable threads in materials that traditionally struggle under the stress of repeated assembly and disassembly. Threaded inserts extend the life and boost the performance of plastic components across various applications.

By integrating a metal thread into plastic parts, threaded inserts forge a stronger, more reliable connection. This fortified bond promises to withstand the rigors of time and usage, ensuring your projects benefit from enhanced strength and longevity.

As we delve into the world of threaded inserts for plastic, we'll explore their significance, types, and the role they play in modern manufacturing and design. From the choice of insert for specific plastic types to the installation techniques, this guide aims to equip you with the knowledge to select and use threaded inserts effectively. Whether you're a professional in the field or a hobbyist looking to improve your projects, understanding the utility and application of these inserts is crucial for achieving optimal results.

Types of Threaded Inserts for Plastic and Their Applications

When it comes to threaded inserts for plastic, the variety available is vast, each designed to meet specific requirements and applications. These small but mighty components play a crucial role in enhancing the durability and functionality of plastic assemblies. By providing reinforced threads for screws and bolts, they enable strong, reliable connections in materials that might otherwise be too soft or brittle to support such fastenings.

From consumer electronics to automotive components, the right insert can significantly improve product performance and longevity. Let's delve into the most common types and their unique benefits:

Heat Set/Ultrasonic Inserts: Ideal for thermoplastics, these inserts are installed using two primary methods. One method is to use a soldering iron with brass installation tip to heat the insert and melt the plastic around the insert, ensuring a secure fit. The heat facilitates the plastic's flow around the insert's external features, creating a strong bond upon cooling. The second method uses an ultrasonic horn to generate vibrations that generate heat as the insert is installed. This heat then melts the plastic around the insert and locks the insert in place. Both installation methods result in a connection with excellent tensile and torque resistance.
Press Inserts: These inserts are pressed into pre-molded or drilled holes. As the insert is installed, it compresses slightly along the slot. As a fastener is threaded into the installed insert, the insert expands and OD diamond knurling grips the wall of the hole. Press inserts are versatile, offering both a strong hold in both thermoset and thermoplastic materials, and a quick and easy installation method.

Choosing the right insert depends on the material characteristics, application requirements, and desired performance outcomes. Understanding the nuances of each insert type is crucial for making informed decisions that lead to successful projects.

Choosing the Right Insert for Your Type of Plastic

Selecting the appropriate threaded insert for plastic hinges on understanding the distinct characteristics of the type of plastic you're working with. Identifying whether you're dealing with thermoset or thermoplastic materials is the first step. Thermoset plastics, known for their durability and heat resistance, are ideal candidates for press inserts. These inserts for thermoset plastics can withstand high temperatures without losing integrity. Conversely, thermoplastics benefit from the adaptability and strength of heat set and ultrasonic inserts, which meld seamlessly with the material to enhance performance. That makes them ideal inserts for thermoplastics. Key factors such as melting point, material strength, and the intended application of the plastic are critical in determining the most suitable insert.

When choosing a threaded insert for plastic, consider the following:

Type of plastic: Thermoplastics, like polypropylene and polyethylene, are versatile and can be remolded. Thermoset plastics, once set, cannot be reshaped.
Insert material: Commonly, brass is used, but stainless steel and aluminum are gaining popularity for their strength, corrosion resistance and lightweight properties.
Pullout force requirements: Ensure the insert can handle the necessary strength without failing or twisting, especially with repeated use.

Installation Techniques for Threaded Inserts

The key to a successful threaded insert for plastic installation lies in the details. Tips for a flawless installation include accurate hole sizing and careful temperature control for heat set/ultrasonic inserts, ensuring the plastic's integrity remains uncompromised.

Other tips for all inserts for plastics include:

Match insert type with plastic material requirements.
Accurately size holes based on type of insert used.
Control heat application for heat set inserts to prevent plastic damage.
Conduct thorough testing to confirm the insert's stability.

Frequently Asked Questions About Threaded Inserts for Plastic

Can Threaded Inserts Be Used in All Types of Plastic?

Threaded inserts can be utilized in a wide range of plastics, particularly those common in injection molding processes. These inserts are versatile and come with various features such as knurling and undercuts to enhance torque and pull-out resistance, making them suitable for most injection molding plastics. Different inserts, including press-in, self-tapping, molded-in, heat, and ultrasonic types, are designed for specific plastic types and installation requirements.

Where Can I Find Technical Specifications and Strength Ratings for Different Threaded Inserts?

Technical specifications and strength ratings for our threaded inserts can be found in our resources section and safety data sheets. These documents provide detailed information about insert materials, sizes, design features, and performance characteristics, helping users select the most appropriate insert for their application. For instance, inserts are available in materials like brass, stainless steel, and aluminum, each offering unique benefits such as corrosion resistance or reduced weight. Samples are also available for customers to test in their specific applications.

How Can I Test the Integrity of the Threaded Insert Installation in My Plastic Component?

Testing the integrity of threaded insert installation involves examining the insert's pull-out and torque resistance after installation. This can be achieved through manual testing methods or specialized equipment designed to measure the force required to dislodge the insert. For accurate testing, it's crucial to follow the manufacturer's guidelines on the proper installation techniques and conditions for the specific type of insert used, such as ensuring the correct hole size and installation pressure. We have a breakdown of the general mechanical testing data we obtained for each of our inserts to use as a guide.

Trust E-Z LOK for Threaded Inserts for Plastic

Choosing threaded inserts for plastic from E-Z LOK means opting for quality, reliability, and ease of use. E-Z LOK's inserts stand out for their innovative design, ensuring a secure fit and superior performance in various plastic applications. Whether you're working with thermoset or thermoplastic materials, E-Z LOK offers a range of inserts designed to meet your project's specific needs. Our user-friendly installation process eliminates the need for specialized tools, making us a preferred choice for professionals and hobbyists alike. By selecting E-Z LOK, you're not just choosing an insert; you're investing in the longevity and success of your project.

Browse our selection of threaded inserts and discover the difference we can make today.