Metric Hoopster Retaining Rings offer an innovative way to retain mechanical components when space is a problem. The minimal radial projection and shallow groove depth allow the Hoopsters to fit where regular stamped rings and retaining rings cannot.


The Hoopster’s low profile, precision circularity, and small radial size allow it to be an unobtrusive component in an assembly. Hoopster Retaining Rings are suitable for light to heavy loads and are ideal for thin-wall tubes. An additional advantage of the Hoopster is its potential for high thrust capacity. The low radial profile will not twist or deform under load as with conventional retaining rings. Over 150 rings are available from 10 to 76 mm in carbon and 302 stainless steel.


Hoopster Retaining Rings are easy to install and remove without any special tools. Specials can be made with No-Tooling-Charges. Internal housing rings are available with an optional bent end (removal provision) to simplify the process.

  • Standard in Carbon and 302 Stainless Steel
  • Coiled From Flat Wire - Not Stamped
  • Suitable for Medium or Light Loads
  • .375 to 3 in. (10 to 73 mm)
  • No Tooling Charges for Specials;
  • .200 to 120 in. (5 to 3000 mm)