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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*obsolete, discontinued, or withdrawn flanges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.

Series 600

2-1/16″ 2M

Series 1500

2-1/16″ 3M

2-1/16″ 5M

Series 2900

1-5/8″ 10M

Series 600

2-9/16″ 2M

Series 900

2-9/16″ 3M

Series 1500

2-9/16″ 5M

Series 2900

2-1/16″  10M

Series 600

3-1/8″ 2M

Series 900

3-1/8″ 3M

Series 1500

3-1/8″ 5M

Series 2900

2-1/16″ 10M

Series 2900

2-9/16″ 10M

Series 600

4-1/16″ 2M

Series 900

4-1/16″ 3M

Series 1500

4-1/16″ 5M

2900

3-1/8″ 10M

Series 600

5-1/8″ 2M

Series 900

5-1/8″ 3M

Series 1500

5-1/8″ 5M

Series 2900

4-1/8″ 10M

Series 600

7-1/16″ 2M

Series 900

7-1/16″ 3M

Series 1500

7-1/16″ 5M

Series 600

9″ 2M

Series 900

9″ 3M

Series 1500

9″ 5M

Series 600

11″ 2M

Series 900

11″ 3M

Series 1500

11″ 5M

Series 2900

7-1/16″ 10M

Series 600

13-5/8″ 2M

Series 900

13-5/8″ 3M

Series 1500

13-5/8″ 5M

Series 600

16-3/4″ 2M

Series 900

16-34″ 3M

Series 600

21-1/4″ 2M

Series 900

20-3/4″ 3M