---
title: Overcoming High-Speed Challenges with Custom Spirolox Retaining Rings | TFC Europe
description: Our innovative self-locking design ensures stability at 17,000 rpm for automotive electric motor applications. Explore our Custom Spirolox Retaining Rings here.
image: https://blog.afceur.com/hubfs/Imported_Blog_Media/Overcoming-High-Speed-Challenges-Main-Image-min.png
---
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# Overcoming High-Speed Challenges with Custom Spirolox Retaining Rings
Simon Ward
### Simon Ward
Simon leads the UK technical team and specialises in the design and development of Smalley wave springs and spiral retaining rings. With over 25 years of experience, Simon develops bespoke parts for major clients around the world and across a wide range of industry sectors. He is now widely considered the leading authority on Smalley products.
June 18, 2018
## ~Innovative self-locking design ensures stability at 17,000 rpm for automotive electric motor applications~
#### An automotive challenge
**Our engineers were faced with a challenge when asked by one of our leading **automotive electric motor** OEM’s to supply a 33mm external retaining ring capable of withstanding rotational speeds in excess of 17,000 rpm. Conventional external retaining rings (circlips) are limited by centrifugal forces when the forces involved are sufficient to lift the ring out of the groove and, in this case, our standard Spirolox rings could only be considered suitable for rotational speeds of around 8,000 rpm.**
#### The Solution
The solution was found by supplying a special custom designed *‘Self-Locking’* ring that allowed the ring to function properly at **higher rpm’s**. The self-locking feature utilises a small tab on the inside turn of the ring that locks into a corresponding slot on the outside turn. In addition to withstanding higher rotational speeds, the ring is also capable of sustaining vibration, functioning under rapid acceleration and absorb a degree of impact loading.
#### What makes our Spirolox Rings unique?
All our Smalley Spirolox rings are manufactured using a unique *edge-winding process* which is as flexible as it is precise and accommodates design changes without the need for additional tooling or die modifications. This process facilitates the development of prototypes allowing the production of low quantity custom orders quickly and economically. Even after the initial prototypes are produced, the same process allows the design to be altered with simple machine adjustments or even a change of raw material size.
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