- Dimensions to ASME B16.21 - Nonmetallic Flat Gaskets for Pipe Flanges
| Pipe Size (NPS) | Gasket Inside Diameter | Gasket Outside Diameter |
|---|
| 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 |
| 5 |
5 9/16 |
7 3/4 |
| 6 |
6 5/8 |
8 3/4 |
| 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 |
| 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 |
| 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 |
