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Flanges

Editorial · Engineering Reference

ANSI / ASME Flange Chart: Class 150 Dimensions

Class 150 flange dimensions for common pipe sizes, with a drilling-pattern diagram and links to Texas Flange charts.

NPS 4 Class 150 drilling pattern: 9 inch outside diameter, 7.5 inch bolt circle, eight 0.75 inch holes. — Original drilling-pattern diagram using Texas Flange reference dimensions; bore and facing omitted.