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Gaskets Size Chart

Ring Gaskets for 125/150# ANSI Pipe Flanges | Ring Gaskets for 250/300# ANSI Pipe Flanges | Full Face Gaskets for 250/300# ANSI Flanges | Dimensions for API Standard 605 (Class A) - 150# Flanges

Ring Gaskets for 125/150# ANSI Pipe Flanges

Nominal Pipe Size	ID	OD
1/2"	27/32	1-7/8
3/4"	1-1/16	2-1/4
1"	1-5/16	2-5/8
1-1/4"	1-21/32	3
1-1/2"	1-29/32	3-3/8
2"	2-3/8	4-1/8
2-1/2"	2-7/8	4-7/8
3"	3-1/2	5-3/8
3-1/2"	4	6-3/8
4"	4-1/2	6-7/8
4-1/2"	5	7
5"	5-9/16	7-3/4
6"	6-5/8	8-3/4
7"	7-5/8	10
8"	8-5/8	11
10"	10-3/4	13-3/8
12"	12-3/4	16-1/8
14"	14	17-3/4
16"	16	20-1/4
18"	18	21-5/8
20"	20	23-7/8

Nominal Pipe Size	ID	OD
22"	22	26
24"	24	28-1/4
26"	26	30-1/2
28"	28	32-3/4
30"	30	34-3/4
32"	32	37
34"	34	39
36"	36	41-1/4
38"	38	43-5/8
40"	40	45-5/8
42"	42	48
46"	46	52-1/8
48"	48	54-1/2
50"	50	56-1/2
52"	52	58-3/4
54"	54	61
60"	60	67-1/2
66"	66	74-1/4
72"	72	80-3/4
84"	84	93-1/2
96"	96	106-1/4

Ring Gaskets for 250/300# ANSI Pipe Flanges

Nominal Pipe Size	ID	OD
1/2"	27/32	2-1/8
3/4"	1-1/16	2-5/8
1"	1-5/16	2-7/8
1-1/4"	1-21/32	3-1/4
1-1/2"	1-29/32	3-3/4
2"	2-3/8	4-3/8
2-1/2"	2-7/8	5-1/8
3"	3-1/2	5-7/8
3-1/2"	4	6-1/2
4"	4-1/2	7-1/8
4-1/2"	5	7-5/8
5"	5-9/16	8-1/2
6"	6-5/8	9-7/8
7"	7-5/8	10-7/8

Nominal Pipe Size	ID	OD
8"	8-5/8	12-1/8
10"	10-3/4	14-1/4
12"	12-3/4	16-5/8
14"	14	19-1/8
15"	15	20-1/8
16"	16	21-1/4
18"	18	23-1/2
20"	20	25-3/4
22"	22	27-5/8
24"	24	30-1/2
30"	30	37-1/2
36"	36	44
42"	42	50-3/4
48"	48	58-3/4

Full Face Gaskets for 250/300# ANSI Flanges

Nominal Pipe Size	Gasket ID	Gasket OD	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
1"	1-5/16	4-7/8	4	3/4	3-1/2
1-1/4"	1-21/32	5-1/4	4	3/4	3-7/8
1-1/2"	1-29/32	6-1/8	4	7/8	4-1/2
2"	2-3/8	6-1/2	8	3/4	5
2-1/2"	2-7/8	7-1/2	8	7/8	5-7/8
3"	3-1/2	8-1/4	8	7/8	6-5/8
3-1/2"	4	9	8	7/8	7-1/4
4"	4-1/2	10	8	7/8	7-7/8
5"	5-9/16	11	8	7/8	9-1/4
6"	6-5/8	12-1/2	12	7/8	10-5/8
8"	8-5/8	15	12	1	13
10"	10-3/4	17-1/2	16	1-1/8	15-1/4
12"	12-3/4	20-1/2	16	1-1/4	17-3/4
14"	14	23	20	1-1/4	20-1/4
16"	16	25-1/2	20	1-3/8	22-1/2
18"	18	28	24	1-3/8	24-3/4
20"	20	30-1/2	24	1-3/8	27
22"	22	33	24	1-5/8	29-1/4
24"	24	36	24	1-5/8	32
26"	26	38-1/4	28	1-7/8	34-1/2
28"	28	40-3/4	28	1-7/8	37
30"	30	43	28	1-7/8	39-1/4
32"	32	45-1/4	28	1-7/8	41-1/2
34"	34	47-1/2	28	1-7/8	43-1/2
36"	36	50	32	2-1/8	46
38"	38	52-1/4	32	2-1/8	48
40"	40	54-1/2	36	2-1/8	50-1/4
42"	42	57	36	2-1/8	52-3/4
44"	44	59-1/4	36	2-1/8	55
46"	46	61-1/2	40	2-1/8	57-1/4
48"	48	65	40	2-1/8	60-3/4

Dimensions for API Standard 605 (Class A) - 150# Flanges

Nominal Pipe Size	Flange OD	Raised Face Diameter	Ring Gasket OD	Number of Bolt Holes	Bolt Hole Diameter	Bolt Circle
26"	30.94	28.00	28.56	36	0.88	29.31
28"	32.94	30.00	30.56	40	0.88	31.31
30"	34.94	32.00	32.56	44	0.88	33.31
32"	37.06	34.00	34.68	48	0.88	35.44
34"	39.56	36.25	36.81	40	1.00	37.69
36"	41.62	38.25	38.88	44	1.00	39.75
38"	44.25	40.25	41.13	40	1.12	42.12
40"	46.25	42.50	43.13	44	1.12	44.12
42"	48.25	44.50	45.13	48	1.12	46.12
44"	50.25	46.50	47.13	52	1.12	48.12
46"	52.81	48.62	49.44	40	1.25	50.56
48"	54.81	50.75	51.44	44	1.25	52.56
50"	56.81	52.75	53.44	48	1.25	54.56
52"	58.81	54.75	55.44	52	1.25	56.56
54"	61.00	56.75	57.63	56	1.25	58.75
56"	63.00	58.75	59.63	60	1.25	60.75
58"	65.94	60.75	62.19	48	1.38	63.44
60"	67.94	63.00	64.19	52	1.38	65.44

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