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ANSI/ASME B16.5-1996 Class 2500
Pipe Size	Outside Diameter	Inside Diameter	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1/2"	5-1/4	...	4	7/8	3-1/2
3/4"	5-1/2	...	4	7/8	3-3/4
1"	6-1/4	...	4	1	4-1/4
1-1/4"	7-1/4	...	4	1-1/8	5-1/8
1-1/2"	8	...	4	1-1/4	5-3/4
2"	9-1/4	...	8	1-1/8	6-3/4
2-1/2"	10-1/2	...	8	1-1/4	7-3/4
3"	12	...	8	1-3/8	9
4"	14	...	8	1-5/8	10-3/4
5"	16-1/2	...	8	1-7/8	12-3/4
6"	19	...	8	2-1/8	14-1/2
8"	21-3/4	...	12	2-1/8	17-1/4
10"	26-1/2	...	12	2-5/8	21-1/4
12"	30	...	12	2-7/8	24-3/8
Notes: This table is intended for estimating purposes only. Applications vary, confirm all dimensions with your engineering department prior to ordering. Refer to the ASME B16.5-1996 standard for complete engineering and applications information. All dimensions are in inches unless otherwise noted. Inside diameter and thickness dimensions are application specific. Recommended bolts are 1/8" smaller than the nominal bolt hole diameters shown.