AWWA C207 Class E Hub Flange

Technical Drawing

The working pressure limit at water service temperature for AWWA C207 Class E hub flange is 275 psi and the maximum pressure (test or transient) allowed can be up to 412.5 psi. The hub flange is a typical slip on flange. If desired by the purchaser, welding neck flanges may be designed and manufactured on this basis. The AWWA C207 Class E flanges have the same diameter and drilling pattern as ASME B16.1 Class 125 cast-iron flanges. In sizes 24″ and smaller, they also match ASME B16.5 Class 150 standard for steel flanges.

Dimensions & Masses

NPS	A	B	Mass
4"	9.00	4.57	5.55
5"	10.00	5.66	6.34
6"	11.00	6.72	7.73
8“	13.50	8.72	12.50
10”	16.00	10.88	17.02
12“	19.00	12.88	26.99
14”	21.00	14.19	35.31
16“	23.50	16.19	45.85
18”	25.00	18.19	49.77
20“	27.50	20.19	63.28
22”	29.50	22.19	73.34
24“	32.00	24.19	89.49
26”	34.25	26.19	106.82
28“	36.50	28.19	121.94
30”	38.75	30.19	137.71
32“	41.75	32.19	170.11
34”	43.75	34.19	182.12
36“	46.00	36.19	205.26
38”	48.75	38.19	239.56
40“	50.75	40.19	260.06
42”	53.00	42.19	294.37
44“	55.25	44.19	312.46
46”	57.25	46.19	332.88
48“	59.50	48.19	362.77
50”	61.75	50.19	375.46
52“	64.00	52.19	418.73
54”	66.25	54.19	464.91
60“	73.00	60.19	569.14
66”	80.00	66.19	625.24
72“	86.50	72.19	872.51
78”	93.00	78.19	1035.01
84“	99.75	84.19	1174.42
90”	106.50	90.19	1389.85
96“	113.25	96.19	1558.52

*A – outside diameter of flange, inch; B – inside diameter of flange, inch; Mass – weight of flange, kg.

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

*Drilling dimensions: n – number of bolts; C – diameter of bolt circle; d – diameter of bolts.
*For sizes ≤ 84″, Bolt holes shall be drilled 1/8″ [3.2 mm] larger in diameter than the nominal diameter of bolt; For sizes > 84″, bolt holes shall be drilled 3/16″ [4.8 mm] larger in diameter than the nominal diameter of bolt.

NPS	T	L	E
4"	0.938	1.312	5.312
5"	0.938	1.438	6.438
6"	1.000	1.562	7.562
8“	1.125	1.750	9.688
10”	1.188	1.938	12.000
12“	1.250	2.188	14.375
14”	1.375	2.250	15.750
16“	1.438	2.500	18.000
18”	1.562	2.688	19.875
20“	1.688	2.875	22.000
22”	1.812	3.125	24.000
24“	1.875	3.250	26.125
26”	2.000	3.375	28.500
28“	2.062	3.438	30.750
30”	2.125	3.500	32.750
32“	2.250	3.625	35.000
34”	2.312	3.688	37.000
36“	2.375	3.750	39.250
38”	2.375	3.750	41.750
40“	2.500	3.875	43.750
42”	2.625	4.000	46.000
44“	2.625	4.000	48.000
46”	2.688	4.062	50.000
48“	2.750	4.125	52.250
50”	2.750	4.125	54.250
52“	2.875	4.250	56.500
54”	3.000	4.375	58.750
60“	3.125	4.500	65.250
66”	3.375	4.875	71.500
72“	3.500	5.000	78.500
78”	3.875	5.375	84.500
84“	3.875	5.375	90.500
90”	4.250	5.750	96.750
96“	4.250	5.750	102.750

*T: thickness of flange, inch; L: through hub length, inch; E: diameter of hub.

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.