Full Face Gaskets - AWWA C207 & C228 Class B, D & E - Custom Gaskets: Gasketing products | Extruded plastic profiles | EDM & CNC Machining

The table below provides the gasket dimensions for American Water Works Association flanges of type C207 (steel flanges) and C228 (stainless steel flanges).

NPS 4 - 24

NPS 26 - 60

NPS 66 - 144

NPS 4 - 24

NPS	ID	OD	Hole Qty	Hole Size	BCD
4	4.5	9	8	0.75	7.5
5	5.56	10	8	0.88	8.5
6	6.62	11	8	0.88	9.5
8	8.62	13.5	8	0.88	11.75
10	10.75	16	12	1	14.25
12	12.75	19	12	1	17
14	14	21	12	1.13	18.75
16	16	23.5	16	1.13	21.25
18	18	25	16	1.25	22.75
20	20	27.5	20	1.25	25
24	24	32	20	1.38	29.5

NPS 26 - 60

NPS	ID	OD	Hole Qty	Hole Size	BCD
26	26	34.25	24	1.38	31.75
28	28	36.5	28	1.38	34
30	30	38.75	28	1.38	36
32	32	41.75	28	1.63	38.5
34	34	43.75	32	1.63	40.5
36	36	46	32	1.63	42.75
38	38	48.75	32	1.63	45.25
40	40	50.75	36	1.63	47.25
42	42	53	36	1.63	49.5
44	44	55.25	40	1.63	51.75
46	46	57.25	40	1.63	53.75
48	48	59.5	44	1.63	56
50	50	61.75	44	1.88	58.25
52	52	64	44	1.88	60.5
54	54	66.25	44	1.88	62.75
56	56	68.75	48	1.88	65
58	58	71	48	1.88	67.25
60	60	73	52	1.88	69.25

NPS 66 - 144

NPS	ID	OD	Hole Qty	Hole Size	BCD
66¹	66.25	80	52	1.88	76
72¹	72.25	86.5	60	1.88	82.5
78¹	78.25	93	64	2.13	89
84¹	84.25	99.75	64	2.13	95.5
90¹	90.25	106.5	68	2.44	102
96¹	96.25	113.25	68	2.44	108.5
102¹	102.25	120	72	2.69	114.5
108¹	108.25	126.75	72	2.69	120.75
114¹	114.25	133.5	76	2.94	126.75
120¹	120.25	140.25	76	2.94	132.75
126¹	126.25	147	80	3.19	139.25
132¹	132.25	153.75	80	3.19	145.75
144¹	144.25	167.25	84	3.44	158.25

NPS = Nominal Pipe Size
ID = Inner Diameter
OD = Outer Diameter
BCD = Bolt Circle Diameter

General Note:
All dimensions are in inches.
Larger sizes as well as customized sizes can be furnished.
Bolt diameter should be 1/8″ less than the bolt hole size.

Standards:
ASME B16.5 – Pipe flanges and flanged fittings: NPS 4 through 24
ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard
¹ For Reference Only

No liability or guarantee for the correctness and completeness of the information provided

NSP 4 - 24

NSP 26 - 60

NSP 66 - 114

NSP 4 - 24

NPS	ID	OD	Hole Qty	Hole Size	BCD
4	4.5	9	8	0.75	7.5
5	5.56	10	8	0.88	8.5
6	6.62	11	8	0.88	9.5
8	8.62	13.5	8	0.88	11.75
10	10.75	16	12	1	14.25
12	12.75	19	12	1	17
14	14	21	12	1.13	18.75
16	16	23.5	16	1.13	21.25
18	18	25	16	1.25	22.75
20	20	27.5	20	1.25	25
24	24	32	20	1.38	29.5

NSP 26 - 60

NPS	ID	OD	Hole Qty	Hole Size	BCD
26	26	34.25	24	1.38	31.75
28	28	36.5	28	1.38	34
30	30	38.75	28	1.38	36
32	32	41.75	28	1.63	38.5
34	34	43.75	32	1.63	40.5
36	36	46	32	1.63	42.75
38	38	48.75	32	1.63	45.25
40	40	50.75	36	1.63	47.25
42	42	53	36	1.63	49.5
44	44	55.25	40	1.63	51.75
46	46	57.25	40	1.63	53.75
48	48	59.5	44	1.63	56
50	50	61.75	44	1.88	58.25
52	52	64	44	1.88	60.5
54	54	66.25	44	1.88	62.75
56	56	68.75	48	1.88	65
58	58	71	48	1.88	67.25
60	60	73	52	1.88	69.25

NSP 66 - 114

NPS	ID	OD	Hole Qty	Hole Size	BCD
66¹	66.25	80	52	1.88	76
72¹	72.25	86.5	60	1.88	82.5
78¹	78.25	93	64	2.13	89
84¹	84.25	99.75	64	2.13	95.5
90¹	90.25	106.5	68	2.44	102
96¹	96.25	113.25	68	2.44	108.5
102¹	102.25	120	72	2.69	114.5
108¹	108.25	126.75	72	2.69	120.75
114¹	114.25	133.5	76	2.94	126.75
120¹	120.25	140.25	76	2.94	132.75
126¹	126.25	147	80	3.19	139.25
132¹	132.25	153.75	80	3.19	145.75
144¹	144.25	167.25	84	3.44	158.25

NPS = Nominal Pipe Size ID = Inner Diameter OD = Outer Diameter BCD = Bolt Circle Diameter General Note: All dimensions are in inches. Larger sizes as well as customized sizes can be furnished. Bolt diameter should be 1/8″ less than the bolt hole size. Standards: ASME B16.5 – Pipe flanges and flanged fittings: NPS 4 through 24 ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard ¹ For Reference Only No liability or guarantee for the correctness and completeness of the information provided

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