Reference


Old API Nominal Flange Designation / ANSI Class * Current API Nominal Flange Sizes
2" SERIES / ANSI CLASS / 600 2-1/16" 2M
2" SERIES / ANSI CLASS / 1500 2-1/16" 3M
2" SERIES / ANSI CLASS / 1500 2-1/16" 5M
2" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
2-1/2" SERIES / ANSI CLASS / 600 2-9/16" 2M
2-1/2" SERIES / ANSI CLASS / 900 2-9/16" 3M
2-1/2" SERIES / ANSI CLASS / 1500 2-9/16" 5M
2-1/2" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
3" SERIES / ANSI CLASS / 600 3-1/8" 2M
3" SERIES / ANSI CLASS / 900 3-1/8" 3M
3" SERIES / ANSI CLASS / 1500 3-1/8" 5M
3" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
3-1/2" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
4" SERIES / ANSI CLASS / 600 4-1/16" 2M
4" SERIES / ANSI CLASS / 900 4-1/16" 3M
4" SERIES / ANSI CLASS / 1500 4-1/16" 5M
5" SERIES / ANSI CLASS / 600 5-1/8" 2M
5" SERIES / ANSI CLASS / 900 5-1/8" 3M
5" SERIES / ANSI CLASS / 1500 5-1/8" 5M
5" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
6" SERIES / ANSI CLASS / 600 7-1/16" 2M
6" SERIES / ANSI CLASS / 900 7-1/16" 3M
6" SERIES / ANSI CLASS / 1500 7-1/16" 5M
8" SERIES / ANSI CLASS / 600 9" 2M
8" SERIES / ANSI CLASS / 900 9" 3M
8" SERIES / ANSI CLASS / 1500 9" 5M
10" SERIES / ANSI CLASS / 600 11" 2M
10" SERIES / ANSI CLASS / 900 11" 3M
10" SERIES / ANSI CLASS / 1500 11" 5M
10" SERIES 2900 / NO ANSI FITS NO CURRENT FLG
12" SERIES / ANSI CLASS / 600 13-5/8" 2M
12" SERIES / ANSI CLASS / 900 13-5/8" 3M
14" SERIES / ANSI CLASS / 1500 FITS NO CURRENT FLG
16" SERIES / ANSI CLASS / 600 16-3/4" 2M
16" SERIES / ANSI CLASS / 900 16-3/4" 3M
20" SERIES / ANSI CLASS / 600 21-1/4" 2M
20" SERIES / ANSI CLASS / 900 20-3/4" 3M
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