Class 250 (extra heavy) iron flanges are manufactured to American National Standard ASME B16.1 and are marked 250. Class 250 iron flanges are available in both black painted and galvanized.
FIG 1021 1021 Blind Flange, Cast Iron
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1021 & 1030 Flanges Submittal
1025 Companion Flange Cast Iron
1030 Reducing Companion Flange Cast Iron