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ANSI/ASME B16.5-1996 Class 300
Pipe Size	Outside Diameter	Inside Diameter	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1/2"	3-3/4	0.88	4	5/8	2-5/8
3/4"	4-5/8	1.09	4	3/4	3-1/4
1"	4-7/8	1.36	4	3/4	3-1/2
1-1/4"	5-1/4	1.70	4	3/4	3-7/8
1-1/2"	6-1/8	1.95	4	7/8	4-1/2
2"	6-1/2	2.44	8	3/4	5
2-1/2"	7-1/2	2.94	8	7/8	5-7/8
3"	8-1/4	3.57	8	7/8	6-5/8
3-1/2"	9	4.07	8	7/8	7-1/4
4"	10	4.57	8	7/8	7-7/8
5"	11	5.66	8	7/8	9-1/4
6"	12-1/2	6.72	12	7/8	10-5/8
8"	15	8.72	12	1	13
10"	17-1/2	10.88	16	1-1/8	15-1/4
12"	20-1/2	12.88	16	1-1/4	17-3/4
14"	23	14.14	20	1-1/4	20-1/4
16"	25-1/2	16.16	20	1-3/8	22-1/2
18"	28	18.18	24	1-3/8	24-3/4
20"	30-1/2	20.20	24	1-3/8	27
24"	36	24.25	24	1-5/8	32
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.