AWWA C207 Class B Blind Flange Dimensions

DIMENSIONAL DATA

NPS	OD of a Flange (A)	ID of a Flange (B)	Number of Bolts	Diameter of Bolt Circle (C)	Diameter of Bolts	Thickness of Flange Class B (T)
4	9.00	4.57	8	7.50	0.625	0.625
5	10.00	5.66	8	8.50	0.750	0.625
6	11.00	6.72	8	9.50	0.750	0.688
8	13.50	8.72	8	11.75	0.750	0.688
10	16.00	10.88	12	14.25	0.875	0.688
12	19.00	12.88	12	17.00	0.875	0.719
14	21.00	14.19	12	18.75	1.000	0.791
16	23.50	16.19	16	21.25	1.000	0.892
18	25.00	18.19	16	22.75	1.125	0.950
20	27.50	20.19	20	25.00	1.125	1.040
22	29.50	22.19	20	27.25	1.250	1.132
24	32.00	24.19	20	29.50	1.250	1.216
26	34.25		24	31.75	1.250	1.307
28	36.50		28	34.00	1.250	1.398
30	38.75		28	36.00	1.250	1.477
32	41.75		28	38.50	1.500	1.581
34	43.75		32	40.50	1.500	1.661
36	46.00		32	42.75	1.500	1.751
38	48.75		32	45.25	1.500	1.853
40	50.75		36	47.25	1.500	1.933
42	53.00		36	49.50	1.500	2.023
44	55.25		40	51.75	1.500	2.114
46	57.25		40	53.75	1.500	2.194
48	59.50		44	56.00	1.500	2.285
50	61.75		44	58.25	1.750	2.377
52	64.00		44	60.50	1.750	2.468
54	66.25		44	62.75	1.750	2.559
60	73.00		52	69.25	1.750	2.820
66	80.00		52	76.00	1.750	3.092
72	86.50		60	82.50	1.750	3.353

TABLE NOTE

1. Ring flanges may be overbored or counterbored to accommodate larger outside-diameter (OD) pipe than shown as nominal. This is done to allow a clear inside diameter (ID) after cement-mortar lining. Wrench clearance between the pipe OD and bolt circle, as well as sufficient gasket seating area, must be maintained.

2. Metric conversion—nominal pipe size: in. × 25 = mm; dimensions: in. × 25.4 = mm; psi × 6.895 = kPa.

AWWA C207 Class BBlind Flange

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AWWA C207 Class B
Blind Flange