TFC Ltd

All Springs Are Not Equal
Wave Springs offer the unique advantage of space savings when used to replace coil springs. With their smooth, circular coiled sinusoidal wave form, and rolled round edges of pre-tempered wire, Smalley’s edgewound Wave Springs offer many advantages:

  • Reduced spring height by 50%
  • Same force and deflection as coil springs
  • Fit tight radial and axial spaces
  • Over 4,000 standard sizes in carbon and stainless steel.
  • No Tooling Charges for special designs
  • Exotic alloys for all environments 
High-Speed Electric Motor Demands Superior Retaining Ring Products

High-Speed Electric Motor Demands Superior Retaining Ring Products

Our engineers were faced with a problem 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 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.


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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