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Retaining Ring

Model / MPN: MIL-R-21248 | NSN: 5325-00-010-2509
ITAR Registered seal

A resilient metal item, circular or nearly circular, which is designed to be inserted into an internal or external groove and retained by its own spring action, or it may have external prongs or projections designed to be inserted into a hole and retained by spring action of the prongs which grip by embedding into the material. For items having internal prongs which perform the same function, see push on nut. It is used to keep and/or lock a par (s) in position, as a ball bearing on a shaft or in a housing. See also clip, retaining and pin, lock. Excludes ring, connecting, round.

Product Details
NATO Stock Number
Sold in multiples of
50 EA
Cross Sectional Shape
Inside Diameter
Between 0.142 inches and 0.146 inches
Casehardening Indicator
Not casehardened
Major Thickness
Between 0.023 inches and 0.028 inches
Ring Style
Usage Design
Material Hardness Rating
Between 48.0 Rockwell c and 53.0 Rockwell c
Steel, sae 1065 to 1090
Steel, sae 1065 to 1090
Surface Treatment
Cadmium and dichromate
Surface Treatment
Cadmium, dichromate treated
Solicitation Description Qty UOM Close Date
SPE5E417T3601 Ring, Retaining 334 EA 12/20/2016

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MIL-R-21248 Cross Reference
  • MS16633-1018
  • 9419254
  • 9419254
  • FD9005-3