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ANSI/ASME B16.1-1989 Class 250
Pipe Size	Outside Diameter	Inside Diameter	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1"	4-7/8	...	4	3/4	3-1/2
1-1/4"	5-1/4	...	4	3/4	3-7/8
1-1/2"	6-1/8	...	4	7/8	4-1/2
2"	6-1/2	...	8	3/4	5
2-1/2"	7-1/2	...	8	7/8	5-7/8
3"	8-1/4	...	8	7/8	6-5/8
3-1/2"	9	...	8	7/8	7-1/4
4"	10	...	8	7/8	7-7/8
5"	11	...	8	7/8	9-1/4
6"	12-1/2	...	12	7/8	10-5/8
8"	15	...	12	1	13
10"	17-1/2	...	16	1-1/8	15-1/4
12"	20-1/2	...	16	1-1/4	17-3/4
14"	23	...	20	1-1/4	20-1/4
16"	25-1/2	...	20	1-3/8	22-1/2
18"	28	...	24	1-3/8	24-3/4
20"	30-1/2	...	24	1-3/8	27
24"	36	...	24	1-5/8	32
30"	43	...	28	2	39-1/4
36"	50	...	32	2-1/4	46
42"	57	...	36	2-1/4	52-3/4
48"	65	...	40	2-1/4	60-3/4
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 B16.1-1989 standard for complete engineering and applications information. All dimensions are in inches unless otherwise noted. Inside diameter and thickness dimensions are application specific.