What Are Threaded Inserts and Their Types?

In construction and manufacturing, threaded inserts are frequently used to add friction to a mounting hole so that a fastener will be less likely to loosen. Also known as threaded bushing, inserts can be pushed into a smooth hole to add internal threading designed to support a threaded fastener. These components come in a number of different types that adapt them to different surfaces and usages. In this blog, we will discuss the different types of threaded inserts and how they may best be used.

Externally Threaded Inserts

The vast majority of threaded inserts feature internal threading, but there are some which have both internal and external threading. These are known as externally threaded inserts, and they are employed for use in threaded holes to add additional strength, or otherwise minimize the depth or width of the hole.

Captive Threaded Inserts

Captive threaded inserts feature a built-in nut which can add greater strength to the fastening surface or make it easier to install. By incorporating a nut into the insert, there will be more surface area around the exterior of the hole which can better protect its edges. There are several varieties of captive threaded inserts to choose from depending on the needs of an application. Clip-nut captive threaded inserts, for example, feature a clip which can be used to clip them onto surfaces. Rather than drilling, clip-nuts can be clipped into place to protect delicate material from excessive wear during the installation process.

Press-Fit Threaded inserts

Also known as push-fit threaded inserts, press-fit inserts are installed simply by pushing them into the hole. You can easily place a press-fit threaded insert over a smooth hole and then press it into place. Due to their simple installation, press-fit threaded inserts are commonly used with composites and other softer materials, such as in the floor panels of an aircraft or wall panels on semi-trucks.

Helical Threaded Inserts

Distinguished by their helical design, these inserts consist of a spiral or helical piece of wire which can be inserted into a hole. Due to the way in which the coiled wire forms both internal and external threading, helical threaded inserts are typically classified as externally threaded inserts. As a result of their unique design, helical threaded inserts are ideal for metalworking and safety applications, alongside other operations where they may provide stronger threads in aluminum, zinc casting, wood, and other materials.

Conclusion

For many thin or soft surfaces, drilling may present an issue when looking for a way to create a threaded hole. In cases like this, threaded inserts may be used as an alternative solution. When placed in a hole, they can offer sturdy internal threading in materials that cannot provide it themselves or may simply benefit from a more secure installation process. At Procurement Aces, we are a leading distributor of aircraft parts, including a wealth of aviation-grade threaded inserts and other high quality fasteners. To begin the purchasing process on any items of interest, you may peruse our online catalog of available parts. Upon finding any items that suit your needs, we encourage you to submit a completed RFQ form online to receive a competitive quote for your comparisons.