What are the different types of wire thread insert?

Coil thread inserts are invaluable components in engineering, providing enhanced strength and reliability to mechanical joints. Their versatile design enables the integration of lighter and softer metals, making them indispensable in industries that seek to improve sustainability such as with automotive and aerospace. 

In this article, we will explore the various types of coil thread inserts. We unpack the different material compositions and surface treatments available to help you select the right one for your application. 

The two main types of coil thread inserts 

Tanged coil thread inserts

Tanged coil thread inserts are the traditional and most commonly used type, seeing widespread use for close to a century. They are an inexpensive joint solution that enhances shear strength whilst protecting parent materials from wear. They feature a distinctive tang that is broken off once the insert is correctly positioned, ensuring optimal installation. 

Key advantages

• Enhanced joint strength - Brings strength, durability and reliability to mechanical joints
  
• Cost-effective - Inexpensive with a simple design and installation process.
  
• Standards compliance - Widely accepted across various industries.
  

Tangless coil thread inserts

Tangless coil thread inserts are an innovative solution to the common issue associated with tanged types: foreign object debris (FOD). FOD from tangs can cause significant complications if left unchecked, requiring time and cost consuming processes to ensure each tang is retrieved. Tangless coil thread inserts prevent this by eliminating the need for a tang, further simplifying the installation and maintenance process. 

• No FOD risk - Eliminates the need for tang retrieval.
• Bi-directional design - Easier and faster to install and remove, enhancing maintenance efficiency.
  
• Equal strength - Offers the same strength and reliability as tanged inserts without the risk of tang-related issues.

Materials compositions for coil thread inserts 

After selecting the type of coil thread insert, the next step is choosing the right material composition. This choice of material is crucial as it determines the insert's performance under specific environmental conditions and loads. Here are some common materials used:

• 304 stainless steel: Provides a good balance of strength, corrosion resistance and temperature capability. Suitable for general use but not for extreme conditions.
• Phosphor bronze: Excellent corrosion resistance, making it ideal for use in saltwater and highly corrosive environments.
• Inconel X-750: Designed for high-temperature applications, capable of maintaining strength and integrity at temperatures up to 1000°F.
• Nitronic 60: Known for its superior resistance to wear, fretting and galling, as well as enhanced thermal resistance, making it suitable for applications involving softer parent materials.

Surface treatments and finishes for coil thread inserts

The final step in selecting the perfect coil thread insert is choosing the right surface treatment and/or finishes. This further enhances the performance of coil thread inserts in specific applications by providing additional protection against environmental factors such as corrosion, wear and high temperatures.

• Cadmium plating: Offers extra corrosion resistance and reduces friction between the insert and bolt, which helps prevent galling.
  
• Silver plating: Provides lubricity at high temperatures, maintaining performance in high-heat environments.
  
• Colour identification: Some inserts come with coloured finishes to serve as identifiers for specific applications, simplifying maintenance and ensuring the correct inserts are used.
  

Find the perfect coil thread insert for your design with KATO® Advanex

Coil thread inserts are a versatile and effective solution for creating strong, reliable joints in various engineering applications. By understanding the differences between tanged and tangless inserts, as well as specific material compositions and surface treatments, you can select the perfect insert to enhance the performance and longevity of your joints and designs. 

To make your life even easier, KATO® Advanex offers the best selection of high-quality coil thread inserts for you to choose from. Our inserts are trusted across industries for their ability to perform in a variety of environments without compromising on factors like ease of installation and maintenance. Our wide range of tanged and tangless options in specific material compositions and surface finishes makes it simple for you to find the exact fit for your project. 

To find out more about our products or to get additional pricing information, contact a member of our team today.