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ANSI/ASME B16.5-1996 Class 400
Pipe Size	Outside Diameter	Inside Diameter	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1/2"	see Class 600
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
3-1/2"
4"	10	4.57	8	1	8-7/8
5"	11	5.66	8	1	9-1/4
6"	12-1/2	6.72	12	1	10-5/8
8"	15	8.72	12	1-1/8	13
10"	17-1/2	10.88	16	1-1/4	15-1/4
12"	20-1/2	12.88	16	1-3/8	17-3/4
14"	23	14.14	20	1-3/8	20-1/4
16"	25-1/2	16.16	20	1-1/2	22-1/2
18"	28	18.18	24	1-1/2	24-3/4
20"	30-1/2	20.20	24	1-5/8	27
24"	36	24.25	24	1-7/8	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.