AWWA C207 Class D 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 D (T)
4	9.00	4.57	8	7.50	0.625	0.625
5	10.00	5.66	8	8.50	0.750	0.650
6	11.00	6.72	8	9.50	0.750	0.693
8	13.50	8.72	8	11.75	0.750	0.812
10	16.00	10.88	12	14.25	0.875	0.953
12	19.00	12.88	12	17.00	0.875	1.117
14	21.00	14.19	12	18.75	1.000	1.133
16	23.50	16.19	16	21.25	1.000	1.265
18	25.00	18.19	16	22.75	1.125	1.331
20	27.50	20.19	20	25.00	1.125	1.448
22	29.50	22.19	20	27.25	1.250	1.568
24	32.00	24.19	20	29.50	1.250	1.661
26	34.25		24	31.75	1.250	1.786
28	36.50		28	34.00	1.250	1.906
30	38.75		28	36.00	1.250	2.008
32	41.75		28	38.50	1.500	2.150
34	43.75		32	40.50	1.500	2.252
36	46.00		32	42.75	1.500	2.370
38	48.75		32	45.25	1.500	2.506
40	50.75		36	47.25	1.500	2.609
42	53.00		36	49.50	1.500	2.729
44	55.25		40	51.75	1.500	2.849
46	57.25		40	53.75	1.500	2.952
48	59.50		44	56.00	1.500	3.072
50	61.75		44	58.25	1.750	3.196
52	64.00		44	60.50	1.750	3.315
54	66.25		44	62.75	1.750	3.435
60	73.00		52	69.25	1.750	3.779
66	80.00		52	76.00	1.750	4.136
72	86.50		60	82.50	1.750	4.480

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 DBlind Flange

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AWWA C207 Class D
Blind Flange