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Helical Wire Vs. Key-Locking Insert: What’s The Difference?

By October 18, 2021No Comments

Nowadays, there are different types of fasteners, but what is appropriate for you? Helical Wire Thread Inserts or Key-locking inserts. A threaded insert is also a well-known fastener element that inserts into an object for adding a threaded hole, commonly known as a threaded bushing. Moreover, a helical insert is a suitable way to repel strip threads. They are best for soft or light resources, such as wood, magnesium, plastic, aluminum, and zinc die castings.

Also, both of these inserts are appropriate for repairing a stripped threaded hole, gives a durable threaded hole. They are ideal for a soft material, placing a thread on a material too thin to accept it, molding or casting reads into a workpiece removing the machining process, or simplifying. Though Helical Wire inserts and Key-locking threads are both famous for their fastener, which is more suitable?

Today, you will see a comparison of fastener products that are beneficial for repairing damaged threads or supporting a weaker parent substantial like aluminum: Helical Wire Inserts and Key-locking Inserts. Both are applicable in precision industrial and aerospace applications. Let’s have a closer look at the fasteners and find out the best one for your work.

Helical Insert Wire Insert

Helical wire inserts are precision-formed unceasing wire coils that offer enduring, wear-resistant threads that surpass the parent stuff’s strength. Unfortunately, these Helical Wire Thread Inserts are underestimated as people believe they are intended solely for thread repair, but they have other substantial uses. Not to be jumbled with different types of threaded inserts or rivet nuts. Helical wire inserts look like springs and refer to Helical, Screw Thread Inserts, or generally Heli-Coil.

Three typical uses of Helical wire inserts are

1) they help repair damaged threads and protect them from scraping

2) to support threads against damages and flaws due to seizing, stripping, or corrosion;

3) to change threads between inch and metric sizes.

Key-locking insert

This insert is a solid bushing style insert and has wedges or “keys” attached to the upper of the insert. The Key-locking is threaded on both the side (inside and outside). These outwardly threaded inserts help distribute loads and repair or strengthen threads in contrast to failures due to corrosion, stripping, or seizing. Key-locking inserts are beneficial for high torque and high-temperature situations and in applications where fasteners may be recurrently removed and reconvened.

Key-locking inserts are popular in aerospace assemblies. Typical uses of these inserts are electronic equipment, transmission housings, and suspension units. Also, they are appropriate for Heavy Duty inserts, including a thick and heavy-duty thread wall.

The three main difference

There are three main alterations between Key-locking inserts and Helical wire inserts:

  1. Strength: Key-locking inserts are more robust than Helical wire inserts
  2. Ease of installation: Key-locking inserts are simple, more accessible, and quick to install than Helical wire inserts
  3. Price: Key-locking inserts are more costly than Helical wire inserts!

So, when your priority is reducing costs and minimizing space go for Helical wire inserts. On the other hand, if high vibration, heavy wear, and high heat conditions are required and saving space is not a priority, and hole depth is limited, then Key-locking inserts are ideal.

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