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ANSI/ASME B16.5-1996 Class 900
Pipe Size	Outside Diameter	Inside Diameter	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1/2"	see Class 1500
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"	9-1/2	3.57	8	1-1/8	7-1/2
4"	11-1/2	4.57	8	1-1/4	9-1/4
5"	13-3/4	5.66	8	1-3/8	11
6"	15	6.72	12	1-1/4	12-1/2
8"	18-1/2	8.72	12	1-1/2	15-1/2
10"	21-1/2	10.88	16	1-1/2	18-1/2
12"	24	12.88	20	1-1/2	21
14"	25-1/4	14.14	20	1-5/8	22
16"	27-3/4	16.16	20	1-3/4	24-1/4
18"	31	18.18	20	2	27
20"	33-3/4	20.20	20	2-1/8	29-1/2
24"	41	24.25	20	2-5/8	35-1/2
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.