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Products » O-Rings » Back Up Rings » Standard Back Up Ring
Standard Back-Up Ring


Primarily an anti-extrusion device, standard back-up rings are used in both static and dynamic sealing. Made of materials that are resistant to pressure induced flow, back-up rings prevent a seal from extruding into the clearance gap between mating parts.

RT Dygert's standard Hytrel® back-up rings are equivalent to AN6224, AN6246, MS28774, MS28782, and MS28783 specifications.  Our PTFE back-up rings feature a scarf cut to facilitate installation and are precisely machined to MS28774 specifications.  Both types of back-up rings share a common rectangular cross-section.

Stock Materials are PTFE & Hytrel®. The temperatures ranges are -300°F to +500°F for PTFE and -60°F to +275°F for Hytrel®.

MS28774 Sizes