Spiral Wound Gaskets Dimensions

DIMENSIONS
By Pressure Class per ASME
B16.20b-1997 Flanges (Dimensions in inches)

Nominal Pipe Size Gasket O.D.

150, 300
400, 600 900
1500, 2500

1/2 1.25 1.25

3/4 1.56 1.56

1 1.88 1.88

1 1/4 2.38 2.38

1 1/2 2.75 2.75

2 3.38 3.38

2 1/2 3.88 3.88

3 4.75 4.75

4 5.88 5.88

5 7.00 7.00

6 8.25 8.25

8 10.38 10.13

10 12.50 12.25

12 14.75 14.50

14 16.00 15.75

16 18.25 18.00

20 22.75 22.50

24 27 26.75

Nominal Pipe Size Gasket I.D.

150 300 400 600 900 1500 2500

1/2 0.75 0.75 0.75 0.75 0.75 0.75 0.75

3/4 1.00 1.00 1.00 1.00 1.00 1.00 1.00

1 1.25 1.25 1.25 1.25 1.25 1.25 1.25

1 1/4 1.88 1.88 1.88 1.88 1.56 1.56 1.56

1 1/2 2.13 2.13 2.13 2.13 1.88 1.88 1.88

2 2.75 2.75 2.75 2.75 2.31 2.31 2.31

2 1/2 3.25 3.25 3.25 3.25 2.75 2.75 2.75

3 4.00 4.00 4.00 4.00 3.75 3.63 3.63

4 5.00 4.75 4.75 4.75 4.75 4.63 4.63

5 6.13 6.13 5.81 5.81 5.81 5.63 5.63

6 7.19 7.19 6.88 6.88 6.88 6.75 6.75

8 9.19 9.19 8.88 8.88 8.75 8.50 8.50

10 11.31 11.31 10.81 10.81 10.88 10.50 10.63

12 13.38 13.38 12.88 12.88 12.75 12.75 12.50

14 14.63 14.63 14.25 14.25 14.00 14.25 -

16 16.63 16.63 16.25 16.25 16.25 16.00 -

18 18.69 18.69 18.50 18.50 18.25 18.25 -

20 20.69 20.69 20.50 20.50 20.50 20.25 -

24 24.75 24.75 24.75 24.75 24.75 24.25 -

Nominal Pipe Size Centering Ring O.D.

150 300 400 600 900 1500 2500

1/2 1.88 2.13 2.13 2.13 2.50 2.50 2.75

3/4 2.25 2.63 2.63 2.63 2.75 2.75 3.00

1 2.63 2.88 2.88 2.88 3.13 3.13 3.38

1 1/4 3.00 3.25 3.25 3.25 3.50 3.50 4.13

1 1/2 3.38 3.75 3.75 3.75 3.88 3.88 4.63

2 4.13 4.38 4.38 4.38 5.63 5.63 5.75

2 1/2 4.88 5.13 5.13 5.13 6.50 6.50 6.63

3 5.38 5.88 5.88 5.88 6.63 6.88 7.75

4 6.88 7.13 7.00 7.63 8.13 8.25 9.25

5 7.75 8.50 8.38 9.50 9.75 10.00 11.00

6 8.75 9.88 9.75 10.50 11.38 11.13 12.50

8 11.00 12.13 12.00 12.63 14.13 13.88 15.25

10 13.38 14.25 14.31 15.75 17.13 17.13 18.75

12 16.13 16.63 16.50 18.00 19.63 20.50 21.63

14 17.75 19.13 19.00 19.38 20.50 22.75 -

16 20.25 21.25 21.13 25.25 22.63 25.25 -

18 21.63 23.50 23.38 24.13 25.13 27.75 -

20 23.88 25.75 25.50 26.88 27.50 29.75 -

24 28.25 30.50 30.25 31.13 33.00 35.50 -

NOTES:

1. Nominal gasket thickness is .175"
Nominal centering ring thickness is 1/8". 2. Gaskets within color shaded areas use
the same gasket for a given size.

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Nominal Pipe Size	Gasket O.D.
Nominal Pipe Size	150, 300 400, 600	900 1500, 2500
1/2	1.25	1.25
3/4	1.56	1.56
1	1.88	1.88
1 1/4	2.38	2.38
1 1/2	2.75	2.75
2	3.38	3.38
2 1/2	3.88	3.88
3	4.75	4.75
4	5.88	5.88
5	7.00	7.00
6	8.25	8.25
8	10.38	10.13
10	12.50	12.25
12	14.75	14.50
14	16.00	15.75
16	18.25	18.00
20	22.75	22.50
24	27	26.75

Nominal Pipe Size	Gasket I.D.
Nominal Pipe Size	150	300	400	600	900	1500	2500
1/2	0.75	0.75	0.75	0.75	0.75	0.75	0.75
3/4	1.00	1.00	1.00	1.00	1.00	1.00	1.00
1	1.25	1.25	1.25	1.25	1.25	1.25	1.25
1 1/4	1.88	1.88	1.88	1.88	1.56	1.56	1.56
1 1/2	2.13	2.13	2.13	2.13	1.88	1.88	1.88
2	2.75	2.75	2.75	2.75	2.31	2.31	2.31
2 1/2	3.25	3.25	3.25	3.25	2.75	2.75	2.75
3	4.00	4.00	4.00	4.00	3.75	3.63	3.63
4	5.00	4.75	4.75	4.75	4.75	4.63	4.63
5	6.13	6.13	5.81	5.81	5.81	5.63	5.63
6	7.19	7.19	6.88	6.88	6.88	6.75	6.75
8	9.19	9.19	8.88	8.88	8.75	8.50	8.50
10	11.31	11.31	10.81	10.81	10.88	10.50	10.63
12	13.38	13.38	12.88	12.88	12.75	12.75	12.50
14	14.63	14.63	14.25	14.25	14.00	14.25	-
16	16.63	16.63	16.25	16.25	16.25	16.00	-
18	18.69	18.69	18.50	18.50	18.25	18.25	-
20	20.69	20.69	20.50	20.50	20.50	20.25	-
24	24.75	24.75	24.75	24.75	24.75	24.25	-

Nominal Pipe Size	Centering Ring O.D.
Nominal Pipe Size	150	300	400	600	900	1500	2500
1/2	1.88	2.13	2.13	2.13	2.50	2.50	2.75
3/4	2.25	2.63	2.63	2.63	2.75	2.75	3.00
1	2.63	2.88	2.88	2.88	3.13	3.13	3.38
1 1/4	3.00	3.25	3.25	3.25	3.50	3.50	4.13
1 1/2	3.38	3.75	3.75	3.75	3.88	3.88	4.63
2	4.13	4.38	4.38	4.38	5.63	5.63	5.75
2 1/2	4.88	5.13	5.13	5.13	6.50	6.50	6.63
3	5.38	5.88	5.88	5.88	6.63	6.88	7.75
4	6.88	7.13	7.00	7.63	8.13	8.25	9.25
5	7.75	8.50	8.38	9.50	9.75	10.00	11.00
6	8.75	9.88	9.75	10.50	11.38	11.13	12.50
8	11.00	12.13	12.00	12.63	14.13	13.88	15.25
10	13.38	14.25	14.31	15.75	17.13	17.13	18.75
12	16.13	16.63	16.50	18.00	19.63	20.50	21.63
14	17.75	19.13	19.00	19.38	20.50	22.75	-
16	20.25	21.25	21.13	25.25	22.63	25.25	-
18	21.63	23.50	23.38	24.13	25.13	27.75	-
20	23.88	25.75	25.50	26.88	27.50	29.75	-
24	28.25	30.50	30.25	31.13	33.00	35.50	-

NOTES:
1. Nominal gasket thickness is .175" Nominal centering ring thickness is 1/8".	2. Gaskets within color shaded areas use the same gasket for a given size.