AWWA C207 Class E Ring Flange

Technical Drawing

The AWWA C207 Class E steel ring flanges (S/O plate flanges) are available in sizes 4″ through 144″. These flanges have the same OD and drilling pattern as Class 125 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 150 drilling for steel flanges.

Dimensions & Masses

NPS	A	B	T
4"	9.00	4.57	1.125
5"	10.00	5.66	1.188
6"	11.00	6.72	1.313
8"	13.50	8.72	1.500
10"	16.00	10.88	1.563
12"	19.00	12.88	1.750
14"	21.00	14.19	1.875
16"	23.50	16.19	2.000
18"	25.00	18.19	2.125
20"	27.50	20.19	2.375
22"	29.50	22.19	2.500
24"	32.00	24.19	2.625
26"	34.25	26.19	2.750
28"	36.50	28.19	2.750
30"	38.75	30.19	2.875
32"	41.75	32.19	3.000
34"	43.75	34.19	3.000
36"	46.00	36.19	3.125
38"	48.75	38.19	3.125
40"	50.75	40.19	3.250
42"	53.00	42.19	3.375
44"	55.25	44.19	3.375
46"	57.25	46.19	3.438
48"	59.50	48.19	3.500
50"	61.75	50.19	3.500
52"	64.00	52.19	3.625
54"	66.25	54.19	3.750
60"	73.00	60.19	3.875
66"	80.00	66.19	4.250
72"	86.50	72.19	4.375
78"	93.00	78.19	4.750
84"	99.75	84.19	4.750
90"	106.50	90.19	5.125
96"	113.25	96.19	5.125
102"	120.00	102.19	5.500
108"	126.75	108.19	5.500
114"	133.50	114.19	5.875
120"	140.25	120.19	5.875
126"	147.00	126.19	6.250
132"	153.75	132.19	6.250
144"	167.25	144.19	6.750

*A: OD of flange; B: ID of flange; T: thickness of flange; All dimensions are in inch unit.
*The purchaser shall specify the ID of the flange, dimension B, for NPS 26″ and larger. The diameter of the flange bore shall not exceed the pipe OD by more than 0.25″.

NPS	n	C	d
4"	8	7.50	0.625
5"	8	8.50	0.750
6"	8	9.50	0.750
8"	8	11.75	0.750
10"	12	14.25	0.875
12"	12	17.00	0.875
14"	12	18.75	1.000
16"	16	21.25	1.000
18"	16	22.75	1.125
20"	20	25.00	1.125
22"	20	27.25	1.250
24"	20	29.50	1.250
26"	24	31.75	1.250
28"	28	34.00	1.250
30"	28	36.00	1.250
32"	28	38.50	1.500
34"	32	40.50	1.500
36"	32	42.75	1.500
38"	32	45.25	1.500
40"	36	47.25	1.500
42"	36	49.50	1.500
44"	40	51.75	1.500
46"	40	53.75	1.500
48"	44	56.00	1.500
50"	44	58.25	1.750
52"	44	60.50	1.750
54"	44	62.75	1.750
60"	52	69.25	1.750
66"	52	76.00	1.750
72"	60	82.50	1.750
78"	64	89.00	2.000
84"	64	95.50	2.000
90"	68	102.00	2.250
96"	68	108.50	2.250
102"	72	114.50	2.500
108"	72	120.75	2.500
114"	76	126.75	2.750
120"	76	132.75	2.750
126"	80	139.25	3.000
132"	80	145.75	3.000
144"	84	158.25	3.250

*n: number of bolts; C: diameter of bolt circle; d: diameter of bolts; All dimensions are in inch unit.
*For flanges up to NPS 84″, bolt holes shall be drilled 1/8″ [3.2 mm] larger in diameter than the nominal diameter of the bolt. For flanges larger than 84″, bolt holes shall be drilled 3/16″ [4.8 mm] larger than the nominal bolt diameter.

NPS	Mass
4"	6.32
5"	7.42
6"	9.25
8"	15.17
10"	19.84
12"	32.37
14"	42.52
16"	54.53
18"	57.78
20"	76.15
22"	85.89
24"	106.40
26"	122.74
28"	134.65
30"	156.04
32"	191.84
34"	200.23
36"	227.89
38"	263.19
40"	284.11
42"	318.46
44"	339.00
46"	360.70
48"	389.61
50"	402.89
52"	445.91
54"	491.71
60"	596.39
66"	788.39
72"	910.52
78"	1078.02
84"	1234.84
90"	1451.89
96"	1640.90
102"	1909.96
108"	2134.06
114"	2449.70
120"	2711.78
126"	3076.61
132"	3379.57
144"	4220.86

*The unit of mass: kg.

AWWA C207 Pipe Flange Dimensions & Masses
Ring Flange	Class B | Class D Class E | Class F
Blind Flange	Class B | Class D Class E | Class F
Hub Flange	Class D | Class E

*Click to view more information about AWWA C207 steel flanges.