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Carbon and Stainless Steel Flanges - ASME/ANSI Class 2500

ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

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ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts for Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind flanges.

Carbon and stainless steel qualities according ASME B16.5 Table 1A.

Carbon and Stainless Steel Flanges - ASME/ANSI Class 2500
Pipe Size (inches)	Flange Outside Diameter (inches)	Pipe Outside Diameter (inches)	Number of Bolt Holes	Bolt Hole Diameter (inches) ¹⁾	Bolt Circle (inches)
1/2	5-1/4	0.84	4	7/8	3-1/2
3/4	5-1/2	1.05	4	7/8	3-3/4
1	6-1/4	1.32	4	1	4-1/4
1-1/4	7-1/4	1.66	4	1-1/8	5-1/8
1-1/2	8	1.90	4	1-1/4	5-3/4
2	9-1/4	2.38	8	1-1/8	6-3/4
2-1/2	10-1/2	2.88	8	1-1/4	7-3/4
3	12	3.50	8	1-3/8	9
4	14	4.50	8	1-5/8	10-3/4
5	16-1/2	5.56	8	1-7/8	12-3/4
6	19	6.63	8	2-1/8	14-1/2
8	21-3/4	8.63	12	2-1/8	17-1/4
10	26-1/2	10.75	12	2-5/8	21-1/4
12	30	12.75	12	2-7/8	24-3/8

¹⁾ Recommended bolts are 1/8 smaller than the nominal bolt hole diameters shown.

1 inch = 25.4 mm

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