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On this page you will find API Spec 6A and API Spec 17D Flange information, dimensions, and a method of Flange identification. Included, you will find a chart comparing old API Series Flanges with many ANSI Flanges and current API Flanges. You can easily obtain Flange bolt sizes, bolt torque, and ring gasket numbers.
Identified Flanges
Choose the flange size and designation to view and download dimensions.
*obsolete, discontinued, or withdrawn flanges
Unidentified Flanges
Identify a flange you don’t recognize by comparing the dimensions to a standard. Select the flange by the measured outside diameter (O.D.) or the measured circumference (Cir.). The measurements may vary slightly due to tolerance. Because different flanges may have the same measured outside diameter or circumference, this method may require that you compare your flange measurements to one or more flanges for positive identification.
Click the dropdown menu to select a flange by it’s outside diameter and circumference.
Series Flanges
View any API Spec 6A Flange originally identified by old API size and series designation and determine which ANSI Flange it will directly connect with by selecting the correct size and series designation in this dropdown.
