Ring Joint Gaskets "RTJ" are available in two different cross
sections, oval or octagonal. Both have identical pitch diameters
for the particular RTJ groove they correspond with. RTJ Oval &
Octagonal can be used in pressures up to 10,000 PSI. The
octagonal type has a higher sealing coefficient than the oval.
Flanges with Octagonal grooves or flat bottom grooves will accept
either style. The oval type is the only type RTJ that will
fit oval or radius grooves.

Gaskets should not be reused once torqued.

 

 

 

 

 

 

 



STYLE R  TABLE 1 - DIMENSIONS IN INCHES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dimension Tables

R11-57

R58-105

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Ring
PRESSURE CLASS RATINGS
 Pitch
Height of Ring
Approx. Distance Between
Gasket Weights, lbs.
No.
ANSI, BS & MSS
API (psi )
Diameter
Width
150
300/600
900
1500
2500
2000/3000
5000
of Ring
of Ring
Oval
Octagonal
Oval
Octagonal
Nominal Pipe Size
P
A
B
H
Flanges
Rings
Rings
R11
-
½
-
-
-
-
-
1.344
0.25
0.44
0.38
-
0.111
0.104
R12
-
-
½
½
-
-
-
1.563
0.313
0.56
0.5
-
0.216
0.2
R13
-
¾
-
-
½
-
-
1.688
0.313
0.56
0.5
-
0.234
0.216
R14
-
-
¾
¾
-
-
-
1.75
0.313
0.56
0.5
-
0.242
0.224
R15
1
-
-
-
-
-
-
1.875
0.313
0.56
0.5
-
0.26
0.24
R16
-
1
1
1
¾
-
-
2
0.313
0.56
0.5
-
0.278
0.256
R17
1¼
-
-
-
-
-
-
2.25
0.313
0.56
0.5
-
0.311
0.288
R18
-
1¼
1¼
1¼
1
-
-
2.375
0.313
0.56
0.5
-
0.328
0.304
R19
1 1/2
-
-
-
-
-
-
2.563
0.313
0.56
0.5
-
0.354
0.328
 R20*
-
1 1/2
1 1/2
1 1/2
-
-
-
2.688
0.313
0.56
0.5
0.16
0.372
0.344
R21
-
-
-
-
1¼
-
-
2.844
0.438
0.69
0.63
-
0.66
0.643
R22
2
-
-
-
-
-
-
3.25
0.313
0.56
0.5
-
0.45
0.415
 R23*
-
2
-
-
1½
2 1/16**
-
3.25
0.438
0.69
0.63
0.19
0.755
0.734
 R24*
-
-
2
2
-
2 1/16
2
3.75
0.438
0.69
0.63
0.19
0.87
0.846
R25
2½
-
-
-
-
-
-
4
0.313
0.56
0.5
-
0.553
0.51
 R26*
-
2½
-
-
-
2 9/16
-
4
0.438
0.69
0.63
0.19
0.93
0.904
 R27*
-
-
2½
2½
-
2 9/16
2 9/16
4.25
0.438
0.69
0.63
0.19
1.05
0.96
R28
-
-
-
-
2½
-
-
4.375
0.5
0.75
0.69
-
1.255
1.23
R29
3
-
-
-
-
-
-
4.5
0.313
0.56
0.5
-
0.622
0.575
R30?
-
3
-
-
-
-
-
4.625
0.438
0.69
0.63
-
1.075
1.047
 R31*
-
3
3
-
-
3 1/8
-
4.875
0.438
0.69
0.63
0.19
1.13
1.1
R32
-
-
-
-
3
-
-
5
0.5
0.75
0.69
-
1.435
1.405
R33
3½
-
-
-
-
-
-
5.188
0.313
0.56
0.5
-
0.718
0.664
R34
-
3½
-
-
-
-
-
5.188
0.438
0.69
0.63
-
1.2
1.17
 R35*
-
-
-
3
-
-
3 1/8
5.375
0.438
0.69
0.63
0.19
1.25
1.21
R36
4
-
-
-
-
-
-
5.875
0.313
0.56
0.5
-
0.813
0.735
 R37*
-
4
4
-
-
4 1/16
-
5.875
0.438
0.69
0.63
0.19
1.36
1.33
R38
-
-
-
-
4
-
-
6.188
0.625
0.88
0.81
-
2.56
2.52
 R39*
-
-
-
4
-
-
4 1/16
6.375
0.438
0.69
0.63
0.19
1.48
1.44
R40
5
-
-
-
-
-
-
6.75
0.313
0.56
0.5
-
0.935
0.865
 R41*
-
5
5
-
-
-
-
7.125
0.438
0.69
0.63
0.19
1.66
1.61
R42
-
-
-
-
5
-
-
7.5
0.75
1
0.94
-
4.21
4.16
R43
-
-
-
-
-
-
-
7.625
0.313
0.56
0.5
-
1.055
0.975
 R44*
-
-
-
5
-
-
-
7.625
0.438
0.69
0.63
0.19
1.77
1.73
 R45*
-
6
6
-
-
7 1/16
-
8.313
0.438
0.69
0.63
0.19
1.93
1.88
 R46*
-
-
-
6
-
-
7 1/16
8.313
0.5
0.75
0.69
0.13
2.39
2.33
 R47*
-
-
-
-
6
-
-
9
0.75
1
0.94
0.16
5.06
4.99
R48
8
-
-
-
-
-
-
9.75
0.313
0.56
0.5
-
1.35
1.24
 R49*
-
8
8
-
-
9
-
10.625
0.438
0.69
0.63
0.19
2.47
2.4
 R50*
-
-
-
8
-
-
9
10.625
0.625
0.88
0.81
0.16
4.4
4.32
R51
-
-
-
-
8
-
-
11
0.875
1.13
1.06
-
8.05
8.17
R52
10
-
-
-
-
-
-
12
0.313
0.56
0.5
-
1.66
1.53
 R53*
-
10
10
-
-
11
-
12.75
0.438
0.69
0.63
0.19
3
2.88
R54
-
-
-
10
-
-
11
12.75
0.625
0.88
0.81
0.16
5.29
5.18
R55
-
-
-
-
10
-
-
13.5
1.125
1.44
1.38
-
16.23
17.04
R56
12
-
-
-
-
-
-
15
0.313
0.56
0.69
-
2.07
1.92
 R57*
-
12
12
-
-
13 5/8
-
15
0.438
0.69
0.63
0.19
3.48
3.38
( * ) Denotes ring number specified in API 6A.                              
Nominal Pipe Sizes marked ( ** ) apply to class rating 2000 only.
 Nominal Pipe Sizes in brackets apply to class rating 3000 only.      
? Ring no. R30 is suitable for lapped flanges only.
Ring
PRESSURE CLASS RATINGS
 Pitch
Height of Ring
Approx. Distance Between
Gasket Weights, lbs.
No.
ANSI, BS & MSS
API (psi )
Diameter
Width
150
300/600
900
1500
2500
2000/3000
5000
of Ring
of Ring
Oval
Octagonal
Oval
Octagonal
Nominal Pipe Size
P
A
B
H
Flanges
Rings
Rings
 R20*
-
1 1/2
1 1/2
1 1/2
-
-
-
2.688
0.313
0.56
0.5
0.16
0.372
0.344
Ring
PRESSURE CLASS RATINGS
 Pitch
Height of Ring
Approx. Distance Between
Gasket Weights, lbs.
No.
ANSI, BS & MSS
API (psi )
Diameter
Width
150
300/600
900
1500
2500
2000/3000
5000
of Ring
of Ring
Oval
Octagonal
Oval
Octagonal
Nominal Pipe Size
P
A
B
H
Flanges
Rings
Rings
R100
-
-
26
-
-
-
-
29.5
1.125
-
1.38
-
Ring
PRESSURE CLASS RATINGS
 Pitch
Height of Ring
Approx. Distance Between
Gasket Weights, lbs.
No.
ANSI, BS & MSS
API (psi )
Diameter
Width
150
300/600
900
1500
2500
2000/3000
5000
of Ring
of Ring
Oval
Octagonal
Oval
Octagonal
Nominal Pipe Size
P
A
B
H
Flanges
Rings
Rings
R58
-
-
-
12
-
-
-
15
0.875
1.13
1.06
-
11
11.13
R59
14
-
-
-
-
-
-
15.265
0.313
0.56
0.5
-
2.16
2
R60
-
-
-
-
12
-
-
16
1.25
1.56
1.5
-
23.1
23.5
R61
-
14
-
-
-
R
-
16.5
0.438
0.69
0.63
-
3.83
3.73
R62
-
-
14
-
-
-
-
16.5
0.625
0.88
0.81
-
6.84
6.71
R63*
-
-
-
14
-
-
-
16.5
1
1.31
1.25
0.22
16.2
16.67
R64
16
-
-
-
-
-
-
17.875
0.313
0.56
0.5
-
2.47
2.29
R65*
-
16
-
-
-
16¾**
-
18.5
0.438
0.69
0.63
0.19
4.3
4.18
R66*
-
-
16
-
-
-16
-
18.5
0.625
0.88
0.81
0.16
7.67
7.53
R67
-
-
-
16
-
-
-
18.5
1.125
1.44
1.38
-
22.3
23.4
R68
18
-
-
-
-
-
-
20.375
0.313
0.56
0.5
-
2.82
2.6
R69*
-
18
-
-
-
-
-
21
0.438
0.69
0.63
0.19
4.87
4.74
R70*
-
-
18
-
-
-18
-
21
0.75
1
0.94
0.19
11.8
11.64
R71
-
-
-
18
-
-
-
21
1.125
1.44
1.38
-
25.2
26.5
R72
20
-
-
-
-
-
-
22
0.313
0.56
0.5
-
3.04
2.81
R73*
-
20
-
-
-
21 ¼**
-
23
0.5
0.75
0.69
0.13
6.6
6.47
R74*
-
-
20
-
-
( 20¾ )
-
23
0.75
1
0.94
0.19
12.95
12.75
R75
-
-
-
20
-
-
-
23
1.25
1.56
1.5
-
33.3
35.3
R76
24
-
-
-
-
-
-
26.5
0.313
0.56
0.5
-
3.66
3.38
R77
-
24
-
-
-
-
-
27.25
0.625
0.88
0.81
-
11.3
11.1
R78
-
-
24
-
-
-
-
27.25
1
1.31
1.25
-
27.1
27.58
R79
-
-
-
24
-
-
-
27.25
1.375
1.75
1.63
0.19
48.7
49.75
R80
22
-
-
-
-
-
-
24.25
0.313
-
0.5
-
-
3.11
R81
-
22
-
-
-
-
-
25
0.563
-
0.75
-
-
8.55
R82*
-
-
-
-
-
-
-
2.25
0.438
-
0.63
0.19
-
0.508
R84*
-
-
-
-
-
-
-
2.5
0.438
-
0.63
0.19
-
0.564
R85*
-
-
-
-
-
-
-
3.125
0.5
-
0.69
0.13
-
0.978
R86*
-
-
-
-
-
-
-
3.563
0.625
-
0.81
0.16
-
1.447
R87*
-
-
-
-
-
-
-
3.938
0.625
-
0.81
0.16
-
1.597
R88*
-
-
-
-
-
-
-
4.875
0.75
-
0.94
0.19
-
2.735
R89*
-
-
-
-
-
-
-
4.5
0.75
-
0.94
0.19
-
2.528
R90*
-
-
-
-
-
-
-
6.125
0.875
-
1.06
0.19
-
4.55
R91*
-
-
-
-
-
-
-
10.25
1.25
-
1.5
0.19
-
15.05
R92
-
-
-
-
-
-
-
9
0.438
0.69
0.63
0.16
2.07
2.02
R93
-
26
-
-
-
-
-
29.5
0.75
-
0.94
-
-
16.33
R94
-
28
-
-
-
-
-
31.5
0.75
-
0.94
-
-
17.44
R95
-
30
-
-
-
-
-
33.75
0.75
-
0.94
-
-
18.69
R96
-
32