ASME B16.20

ASME B16.20 METALLIC GASKETS FOR PIPE FLANGES Ring-Joint, Spiral-Wound, and Jacketed

ASME B16.20 covers materials, dimensions, tolerances, and markings for metal ring-joint gaskets, spiral wound metal gaskets,and metal-jacketed gaskets.These gaskets are dimensionally suitable for use with flanges described in reference flange standards ASME B16.5, ASMEB16.47, API Specification 6A, and ISO 10423. This Standard covers spiral-wound metal gaskets and metal jacketed gaskets for use with raised-face and flat-face flanges.


The outer surface of each gasket shall carry the manufacturer’s name or identification trademark and gasket number prefixed by the letters R, RX, or BX, followed by the gasket material identification. The gasket shall also be marked with an ASMEB16.20 designation. The marking shall be applied so as not to harmfully distort the gasket or affect the integrity of the seal.