api5000API6A (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 2.02API 5000, 10000 are used in reference to wellhead 'christmas tree' pressure ratings as well used for the wing valve, master valve ratings. There may be hher classes as