Daemar Inc. Style 574 Back Up Rings 574-340

Molded of a 90A Durometer Buna-N Rubber. The 574 Style dished Cross section back-up rings provide excellent extrusion resistance. Stretched for installation, they return quickly to their original size for easy installation. PLEASE NOTE: Sizes (Dash NO.) Corresponds to standard o-ring numbers Part Numbers                     T Reference                          A 574-004 thru 574-050          .049                         .045+/-.003 574-102 thru 574-178          .053                         .045+/-.003 574-201 thru 574-284          .050                         .040+/-.003 574-309 thru 574-395          .076                         .060+/-.004 574-425 thru 574-475          .117                         .096+/-.005