Spiral Wound ANSI Class 1500 Gasket, B16.20 (in)

Dimensions to ASME B16.20 - Metallic Gaskets for Pipe Flanges: Ring-Joint, Spiral-Wound, and Jacketed
Inner rings are recommended for all graphite filled gaskets, required for all PTFE filled gaskets , and for NPS 24" and larger in Class 900.
The gasket outside diameter tolerance for NPS 1/2" through NPS 8" is ±0.03"; for NPS 10" through NPS 24", +0.06", –0.03".
The gasket inside diameter tolerance for NPS 1/2" through NPS 8" is ±0.016"; for NPS 10" through NPS 24", ±0.03".
The centering ring outside diameter tolerance is ±0.03".
There are no Class 900 flanges in NPS 1/2" through NPS 2 1/2" (use Class 1500), or Class 2500 flanges NPS 14" and larger.
ASME B16.20 does not include gaskets with no internal ring dimensions for NPS 1/4", 3 1/2" or 41/2".

Pipe Size (NPS)	Inner Ring Inside Diameter A	Sealing Element Inside Diameter B	Sealing Element Outside Diameter C	Outer Ring Outside Diameter D
1/2	0.56	0.75	1.25	2.50
3/4	0.81	1.00	1.56	2.75
1	1.06	1.25	1.88	3.13
1 1/4	1.31	1.56	2.38	3.50
1 1/2	1.63	1.88	2.75	3.88
2	2.06	2.31	3.38	5.63
2 1/2	2.50	2.75	3.88	6.50
3	3.10	3.63	4.75	6.88
3 1/2	—	4.13	5.25	7.38
4	3.85	4.63	5.88	8.25
5	4.90	5.63	7.00	10.00
6	5.80	6.75	8.25	11.13
8	7.75	8.50	10.13	13.88
10	9.69	10.50	12.25	17.13
12	11.50	12.75	14.50	20.50
14	12.63	14.25	15.75	22.75
16	14.50	16.00	18.00	25.25
18	16.75	18.25	20.50	27.75
20	18.75	20.25	22.50	29.75
24	22.75	24.25	26.75	35.50