Ring Joint Gaskets are used with Ring Type Joint (RTJ) flanges. Ring gaskets are also known as RTJ gasket or O-ring Gaskets. These gaskets are used for high-pressure service.

Table below covers ring number of Ring Joint Gaskets up to ASME B16.5 class 2500 rating and API 6A Flanges up to 5000 psi rating.

Ring Joint Gasket

  Flange Pressure Class
Nominal
Pipe Size
(NPS)
150 300-600 900 1500 2500 API 6A (psi)
2000 3000 5000
1/2 -- R-11 R-12 R-12 R-13 -- -- --
3/4 -- R-13 R-14 R-14 R-16 -- -- --
1 R-15 R-16 R-16 R-16 R-18 -- -- --
1 1/4 R-17 R-18 R-18 R-18 R-21 -- -- --
1 1/2 R-19 R-20 R-20 R-20 R-23 -- -- --
2 R-22 R-23 R-24 R-24 R-26 -- -- --
2 1/16 -- -- -- -- -- R-23 R-24 R-24
2 1/2 R-25 R-26 R-27 R-27 R-28 -- -- --
2 9/16 -- -- -- -- -- R-26 R-27 R-27
3 R-29 R-31 R-31 R-35 R-32 -- -- --
3 1/8 -- -- -- -- -- R-31 R-31 R-35
3 1/2 R-33 R-34 R-34 -- -- -- -- --
4 R-36 R-37 R-37 R-39 R-38 -- -- --
4 1/16 -- -- -- -- -- R-37 R-37 R-39
5 R-40 R-41 R-41 R-44 R-42 -- -- --
5 1/8 -- -- -- -- -- R-41 R-41 R-49
6 R-43 R-45 R-45 R-46 R-47 -- -- --
7 1/16 -- -- -- -- -- R-45 R-45 R-46
8 R-48 R-49 R-49 R-50 R-51 -- -- --
9 -- -- -- -- -- R-49 R-49 R-50
10 R-52 R-53 R-53 R-54 R-55 -- -- --
11 -- -- -- -- -- R-53 R-53 R-54
12 R-56 R-57 R-57 R-58 R-60 -- -- --
13 5/8 -- -- -- -- -- R-57 R-57 --
14 R-59 R-61 R-62 R-63 -- -- -- --
16 R-64 R-65 R-66 R-67 -- -- -- --
16 3/4 -- -- -- -- -- R-65 R-65 --
18 R-68 R-69 R-70 R-71 -- -- -- --
20 R-72 R-73 R-74 R-75 -- -- -- --
20 3/4 -- -- -- -- -- -- R74 --
21 1/4 -- -- -- -- -- R-73 -- --
22 R-80 R-81 -- -- -- -- -- --
24 R-76 R-77 R-78 R-79 -- -- -- --
26 -- R-93 R-100 -- -- -- -- --
28 -- R-94 R-101 -- -- -- -- --
30 -- R-95 R-102 -- -- -- -- --
32 -- R-96 R-103 -- -- -- -- --
34 -- R-97 R-104 -- -- -- -- --
36 -- R-98 R-105 -- -- -- -- --

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