api5000The API 6A specification is a standard developed for the American Petroleum Institute and shares many characteristics with ASME flanges. They are similar in dimensions, but their minimumAPI6A (6BX) FLANGES Rating:- API 6BX-10000 PSI WP (With BX type Ring Gasket) Size OD T ØK PCD N Ød ØJ2 J3 BX 113⁄ 16 21⁄ 16 29⁄ 16 7.38 7.88 9.12 1.66 1.73 2.02