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Welding Neck Flanges Product Information Material: Gr1, Gr2, Gr5, Gr7, Gr12 Standard: ANSI B16.5, ASME B16.5, EN1092-1, JIS B2220, DIN2627-2628 Size: 1/2"~ 30"NB, NPS 1/2 - NPS 24 (DN 10 - 2000) . ...