2025-12-05 ASME B16.5 is a production standard for pipe flanges and flange fittings, which specifies the quality control and standardized design of forged steel flanges.Dimension:NPS 1/2 to NPS 24.Pressure:Class 150, 300, 400, 600, 900, 1500, and 2500.Types:weld neck flange, slip on flange, socket weld flange, threaded, lap joint flange, and blind flange.