AWWA C207 Class F Ring Flange

Technical Drawing

The AWWA C207 Class E steel ring flanges (S/O plate flanges) are available in sizes 4″ through 48″. These flanges have the same OD and drilling pattern as Class 250 cast-iron flanges (ASME B16.1). In sizes 24″ and smaller, they also match ASME B16.5 Class 300 drilling for steel flanges.

Dimensions & Masses

NPS	A	B	T
4"	10.00	4.57	1.13
5"	11.00	5.66	1.21
6"	12.50	6.73	1.31
8"	15.00	8.73	1.31
10"	17.50	10.88	1.50
12"	20.50	12.88	1.63
14"	23.00	14.19	1.94
16"	25.50	16.19	2.14
18"	28.00	18.19	2.25
20"	30.50	20.19	2.33
22"	33.00	22.19	2.50
24"	36.00	24.19	2.69
26"	38.25	26.19	3.00
28"	40.75	28.19	3.13
30"	43.00	30.19	3.15
32"	45.25	32.19	3.25
34"	47.50	34.19	3.38
36"	50.00	36.19	3.46
38"	52.25	38.19	3.50
40"	54.25	40.19	3.63
42"	57.00	42.19	3.81
44"	59.25	44.19	4.00
46"	61.50	46.19	4.13
48"	65.00	48.19	4.50

*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	7.88	0.750
5"	8	9.25	0.750
6"	12	10.62	0.750
8"	12	13.00	0.875
10"	16	15.25	1.000
12"	16	17.75	1.125
14"	20	20.25	1.125
16"	20	22.50	1.250
18"	24	24.75	1.250
20"	24	27.00	1.250
22"	24	29.25	1.250
24"	24	32.00	1.500
26"	28	34.50	1.750
28"	28	37.00	1.750
30"	28	39.25	1.750
32"	28	41.50	1.750
34"	28	43.50	1.750
36"	32	46.00	2.000
38"	32	48.00	2.000
40"	36	50.25	2.000
42"	36	52.75	2.000
44"	36	55.00	2.000
46"	40	57.25	2.000
48"	40	60.75	2.000

*n: number of bolts; C: diameter of bolt circle; d: diameter of bolts; All dimensions are in inch unit.
*Bolt holes shall be drilled 1/8″ [3.2 mm] larger in diameter than the nominal diameter of the bolt.

NPS	Mass
4"	8.33
5"	10.13
6"	13.47
8"	18.10
10"	25.40
12"	37.77
14"	58.09
16"	75.74
18"	92.69
20"	112.34
22"	139.23
24"	175.97
26"	205.71
28"	242.69
30"	267.05
32"	299.77
34"	337.68
36"	365.58
38"	398.55
40"	427.36
42"	502.89
44"	563.86
46"	612.59
48"	782.95

*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.