TFC's familiar and popular Smalley Spirolox Retaining Rings can also be manufactured with a unique self-locking feature that make them ideal for applications where high rotational speeds are involved or, where the effects of vibration, rapid acceleration or impact loading is problematic.

Self-locking rings provide a mechanical interference via a small tab on the ring that locks into a corresponding slot in the opposite turn and prevents the ring from expanding out of the groove as a result of centrifugal forces at high rotational speeds.

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The location of the locking mechanism can be dictated by the application requirements. Internal and external locks are easier to install (especially when small diameters or heavy cross-section material is involved) and allow for a simple visual confirmation of proper installation.

Where tamper-proof applications are involved, 'centreline' locks are typically used and once the ring is removed from an application, the tab is broken and a new ring must be installed. This type of locking feature is also less likely to interfere with mating components within the assembly.

Aerospace and Automotive industries often use self-locking rings because the rotational capacity typically meets or exceeds the application requirements and can be found in transmission and clutch assemblies.

For more information, contact TFC's Technical Department on +44 (0)1435 866011 or via

sales@tfc.eu.com