api5000We are a API 6A flange manufacturer,API 6A Type 6B 5000 psi(34.5 MPa) Weld Neck RTJ Flange,API 6 B 3000 psi WN RTJ Flange,API 6BX 10000 PSI Weld Neck Flange,API weld10,000 PSI - Type 6BX API 6A - Table E.4 . Nominal size of Flange: Maximum Bore: Outside Diameter of Flange: Max. Chamfer