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  RTJ - Ring Joint Gaskets  
 

Ring Joint Gaskets are precision machined metallic sealing rings, suitable for high temperature and high pressure applications. By applying pressure to the seal interface through bolt force, the softer metal of the gasket flows into the micro-fine structure of the harder flange material, creating a very tight and efficient seal. They are available in several common profiles to suit a variety of industry standard flanges.

We offer Styles R, RX, and BX as per As per API Standard

STYLE R
Dimensions in mm
Ring No. PRESSURE CLASS RATINGS

PITCH DIAMETER

OF RING

 WIDTHOF RING     APPROX.
DISTANCE
BETWEEN
MADE UP
FLANGES		    
ANSI, BS & MSS API (PSI) HEIGHT OF RING GASKET WEIGHTS, lbs
150 300/600 900 1500 2500 2000/3000 5000 OVAL OCTAGONAL OVAL OCTAGONAL
NOMINAL PIPE SIZE (INCHES)   P A B H    
R11 – 1/2 – – – – – 34.13 6.35 11.1 9.5 – . 111 .104
R12 – – 1/2 1/2 – – – 39.69 7.95 14.3 12.7 – . 216 .20
R13 – 3/4 – – 1/2 – – 42.86 7.95 14.3 12.7 – . 234 .216
R14 – – 3/4 3/4 – – – 44.45 7.95 14.3 12.7 – . 242 .224
R15 1 – – – – – – 47.63 7.95 14.3 12.7 – . 260 .24
R16 – 1 1 1 3/4 – – 50.80 7.95 14.3 12.7 – . 278 .256
R17 1 1/4 – – – – – – 57.15 7.95 14.3 12.7 – . 311 .288
R18 – 1 1/4 1 1/4 1 1/4 1 – – 60.33 7.95 14.3 12.7 – . 328 .304
R19 1 1/2 – – – – – – 65.09 7.95 14.3 12.7 – . 354 .328
R20* – 1 1/2 1 1/2 1 1/2 – – – 68.28 7.95 14.3 12.7 4.1 . 372 .344
R21 – – – – 1 1/4 – – 72.23 11.11 17.5 15.9 – . 660 .643
R22 2 – – – – – – 82.55 7.95 14.3 12.7 – . 450 .415
R23* – 2 – – 1 1/2 2 1/16•• – 82.55 11.11 17.5 15.9 4.8 . 755 .734
R24* – – 2 2 – 2 1/16 2 95.25 11.11 17.5 15.9 4.8 . 870 .846
R25 2 1/2 – – – – – – 101.60 7.95 14.3 12.7 – . 553 .510
R26* – 2 1/2 – – 2 2 9/16 – 101.60 11.11 17.5 15.9 4.8 . 930 .904
R27* – – 2 1/2 2 1/2 – (2 9/16) 2 9/16 107.95 11.11 17.5 15.9 4.8 1.050 .96
R28 – – – – 2 1/2 – – 111.13 12.70 19.1 17.5 – 1.255 1.23
R29 3 – – – – – – 114.30 7.95 14.3 12.7 – . 622 .575
R30*** – 3 – – – – – 117.48 11.11 17.5 15.9 – 1.075 1.047
R31* – 3 3 – – 3 1/8 – 123.83 11.11 17.5 15.9 4.8 1.130 1.10
R32 – – – – 3 – – 127.00 12.70 19.1 17.5 – 1.435 1.405
R33 3 1/2 – – – – – – 131.76 7.95 14.3 12.7 – . 718 .664
R34 – 3 1/2 – – – – – 131.76 11.11 17.5 15.9 – 1.200 1.17
R35* – – – 3 – – 3 1/8 136.53 11.11 17.5 15.9 4.8 1.250 1.21
R36 4 – – – – – – 149.23 7.95 14.3 12.7 – . 813 .735
R37* – 4 4 – – 4 1/16 – 149.23 11.11 17.5 15.9 4.8 1.360 1.33
R38 – – – – 4 – – 157.16 15.88 22.4 20.6 – 2.56 2.52
R39* – – – 4 – – 4 1/16 161.93 11.11 17.5 15.9 4.8 1.480 1.44
R40 5 – – – – – – 171.45 7.95 14.3 12.7 – . 935 .865
R41* – 5 5 – – – – 180.98 11.11 17.5 15.9 4.8 1.66 1.61
R42 – – – – 5 – – 190.50 19.05 25.4 23.9 – 4.21 4.16
R43 6 – – – – – – 193.68 7.95 14.3 12.7 – 1.055 .975
R44* – – – 5 – – – 193.68 11.11 17.5 15.9 4.8 1.77 1.73
R45* – 6 6 – – 7 1/16 – 211.14 11.11 17.5 15.9 4.8 1.93 1.88
R46* – – – 6 – – 7 1/16 211.14 12.70 19.1 17.5 4.8 2.39 2.33
R47* – – – – 6 – – 228.60 19.05 25.4 23.9 4.1 5.06 4.99
R48 8 – – – – – – 247.65 7.95 14.3 12.7 – 1.350 1.24
R49* – 8 8 – – 9 – 269.88 11.11 17.5 15.9 4.8 2.47 2.40
R50* – – – 8 – – 9 269.88 15.88 22.4 20.6 4.1 4.40 4.32
R51 – – – – 8 – – 279.40 22.23 28.6 27.0 – 8.05 8.17
R52 10 – – – – – – 304.80 7.95 14.3 12.7 – 1.66 1.53
R53* – 10 10 – – 11 – 323.85 11.11 17.5 15.9 4.8 3.00 2.88
R54* – – – 10 – – 11 323.85 15.88 22.4 20.6 4.1 5.29 5.18
R55 – – – – 10 – – 342.90 28.58 36.5 34.9 – 16.23 17.04
R56 12 – – – – – – 381.00 7.95 14.3 12.7 – 2.07 1.92
R57* – 12 12 – – 13 5/8 – 381.00 11.11 17.5 15.9 4.8 3.48 3.38
R58 – – – 12 – – – 381.00 22.23 28.6 27.0 – 11.00 11.13
R59 14 – – – – – – 396.88 7.95 14.3 12.7 – 2.16 2.00
R60 – – – – 12 – – 406.40 31.75 39.7 38.1 – 23.10 23.50
R61 – 14 – – – – – 419.10 11.11 17.5 15.9 – 3.83 3.73
R62 – – 14 – – – – 419.10 15.88 22.2 20.6 – 6.84 6.71
R63* – – – 14 – – – 419.10 25.40 33.3 31.8 5.6 16.20 16.67
R64 16 – – – – – – 454.03 7.95 14.3 12.7 – 2.47 2.29
R65* – 16 – – – 16 3/4** – 469.90 11.11 17.5 15.9 4.8 4.30 4.18
R66* – – 16 – – (16) – 469.90 15.88 22.2 20.6 4.1 7.67 7.53
R67 – – – 16 – – – 469.90 28.58 36.5 34.9 – 22.30 23.40
R68 18 – – – – – – 517.53 7.95 14.3 12.7 – 2.82 2.60
R69* – 18 – – – – – 533.40 11.11 17.5 15.9 4.8 4.87 4.74
R70* – – 18 – – (18) – 533.40 19.05 25.4 23.9 4.8 11.80 11.64
R71 – – – 18 – – – 533.40 28.58 36.5 34.9 – 25.20 26.50
R72 20 – – – – – – 558.80 7.95 14.3 12.7 – 3.04 2.81
R73* – 20 – – – 21 1/4** – 584.20 12.7 19.1 17.5 3.3 6.60 6.47
R74* – – 20 – – (20 3/4) – 584.20 19.05 25.4 23.9 4.8 12.95 12.75
R75 – – – 20 – – – 584.20 31.75 39.7 38.1 – 33.30 35.30
R76 24 – – – – – – 673.10 7.95 14.3 12.7 – 3.66 3.38
R77 – 24 – – – – – 692.15 15.88 22.4 20.6 – 11.30 11.10
R78 – – 24 – – – – 692.15 25.4 33.3 31.8 – 27.10 27.58
R79 – – – 24 – – – 692.15 34.93 44.5 41.3 4.8 48.70 49.75
R80 22 – – – – – – 615.95 7.95 – 12.7 – – 3.11
R81 – 22 – – – – – 635.00 14.29 – 19.1 – – 8.55
R82* – – – – – – – 57.14 11.11 – 15.9 4.8 – .508
R84* – – – – – – – 63.50 11.11 – 15.9 4.8 – .564
R85* – – – – – – – 79.38 12.70 – 17.5 3.3 – .978
R86* – – – – – – – 90.50 15.88 – 20.6 4.1 – 1.447
R87* – – – – – – – 100.03 15.88 – 20.6 4.1 – 1.597
R88* – – – – – – – 122.83 19.05 – 23.9 4.8 – 2.735
R89* – – – – – – – 114.30 19.05 – 23.9 4.8 – 2.528
R90* – – – – – – – 155.58 22.23 – 26.9 4.8 – 4.55
R91* – – – – – – – 260.25 31.75 – 38.1 4.1 – 15.05
R92 – – – – – – – 228.60 11.11 17.5 15.9 – 2.07 2.02
R93 – 26 – – – – – 749.30 19.05 – 23.9 – – 16.33
R94 – 28 – – – – – 800.10 19.05 – 23.9 – – 17.44
R95 – 30 – – – – – 857.25 19.05 – 23.9 – – 18.69
R96 – 32 – – – – – 914.40 22.23 – 27.0 – – 26.65
R97 – 34 – – – – – 965.20 22.23 – 27.0 – – 28.13
R98 – 36 – – – – – 1022.35 22.23 – 27.0 – – 29.79
R99* – – – – – – – 234.95 11.11 – 15.9 4.8 – 2.08
R100 – – 26 – – – – 749.30 28.58 – 34.9 –    
R101 – – 28 – – – – 800.10 31.75 – 38.1 –    
R102 – – 30 – – – – 857.25 31.75 – 38.1 –    
R103 – – 32 – – – – 914.40 31.75 – 38.1 –
    
R104 – – 34 – – – – 965.20 34.93 – 41.3 –    
R105 – – 36 – – – – 1022.35 34.93 – 41.3 –    
Ring No. PRESSURE CLASS RATINGS

PITCH DIAMETER

OF RING

 WIDTHOF RING     APPROX.
DISTANCE
BETWEEN
MADE UP
FLANGES		    
ANSI, BS & MSS API (PSI) HEIGHT OF RING GASKET WEIGHTS, lbs
150 300/600 900 1500 2500 2000/3000 5000 OVAL OCTAGONAL OVAL OCTAGONAL
NOMINAL PIPE SIZE (INCHES)   P A B H    
R11 – 1/2 – – – – – 1.344 0.250 0.44 0.38 - 111 .104
R12 – – 1/2 1/2 – – – 1.563 0.313 0.56 0.50 - 216 .20
R13 – 3/4 – – 1/2 – – 1.688 0.313 0.56 0.50 - 234 .216
R14 – – 3/4 3/4 – – – 1.750 0.313 0.56 0.50 - 242 .224
R15 1 – – – – – – 1.875 0.313 0.56 0.50 - 260 .24
R16 – 1 1 1 3/4 – – 2.000 0.313 0.56 0.50 - 278 .256
R17 1 1/4 – – – – – – 2.250 0.313 0.56 0.50 - 311 .288
R18 – 1 1/4 1 1/4 1 1/4 1 – – 2.375 0.313 0.56 0.50 - 328 .304
R19 1 1/2 – – – – – – 2.563 0.313 0.56 0.50 - 354 .328
R20* – 1 1/2 1 1/2 1 1/2 – – – 2.688 0.313 0.56 0.50 0.16 372 .344
R21 – – – – 1 1/4 – – 2.844 0.438 0.69 0.63 – 660 .643
R22 2 – – – – – – 3.250 0.313 0.56 0.50 – 450 .415
R23* – 2 – – 1 1/2 2 1/16•• – 3.250 0.438 0.69 0.63 0.19 755 .734
R24* – – 2 2 – 2 1/16 2 3.750 0.438 0.69 0.63 0.19 870 .846
R25 2 1/2 – – – – – – 4.000 0.313 0.56 0.50 – 553 .510
R26* – 2 1/2 – – 2 2 9/16 – 4.000 0.438 0.69 0.63 0.19 930 .904
R27* – – 2 1/2 2 1/2 – (2 9/16) 2 9/16 4.250 0.438 0.69 0.63 0.19 1.050 .96
R28 – – – – 2 1/2 – – 4.375 0.500 0.75 0.69 – 1.255 1.23
R29 3 – – – – – – 4.500 0.313 0.56 0.50 – 622 .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 1.130 1.10
R32 – – – – 3 – – 5.000 0.500 0.75 0.69 – 1.435 1.405
R33 3 1/2 – – – – – – 5.188 0.313 0.56 0.50 – 718 .664
R34 – 3 1/2 – – – – – 5.188 0.438 0.69 0.63 – 1.200 1.17
R35* – – – 3 – – 3 1/8 5.375 0.438 0.69 0.63 0.19 1.250 1.21
R36 4 – – – – – – 5.875 0.313 0.56 0.50 – 813 .735
R37* – 4 4 – – 4 1/16 – 5.875 0.438 0.69 0.63 0.19 1.360 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 1.480 1.44
R40 5 – – – – – – 6.750 0.313 0.56 0.50 – 935 .865
R41* – 5 5 – – – – 7.125 0.438 0.69 0.63 0.19 1.66 1.61
R42 – – – – 5 – – 7.500 0.750 1.00 0.94 – 4.21 4.16
R43 6 – – – – – – 7.625 0.313 0.56 0.50 – 1.055 .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 0.500 0.75 0.69 0.13 2.39 2.33
R47* – – – – 6 – – 9.000 0.750 1.00 0.94 0.16 5.06 4.99
R48 8 – – – – – – 9.750 0.313 0.56 0.50 – 1.350 1.24
R49* – 8 8 – – 9 – 10.625 0.438 0.69 0.63 0.19 2.47 2.40
R50* – – – 8 – – 9 10.625 0.625 0.88 0.81 0.16 4.40 4.32
R51 – – – – 8 – – 11.000 0.875 1.13 1.06 – 8.05 8.17
R52 10 – – – – – – 12.000 0.313 0.56 0.50 – 1.66 1.53
R53* – 10 10 – – 11 – 12.750 0.438 0.69 0.63 0.19 3.00 2.88
R54* – – – 10 – – 11 12.750 0.625 0.88 0.81 0.16 5.29 5.18
R55 – – – – 10 – – 13.500 1.125 1.44 1.38 – 16.23 17.04
R56 12 – – – – – – 15.000 0.313 0.56 0.69 – 2.07 1.92
R57* – 12 12 – – 13 5/8 – 15.000 0.438 0.69 0.63 0.19 3.48 3.38
R58 – – – 12 – – – 15.00 0.875 1.13 1.06 – 11.00 11.13
R59 14 – – – – – – 15.625 0.313 0.56 0.50 – 2.16 2.00
R60 – – – – 12 – – 16.000 1.250 1.56 1.50 – 23.10 23.50
R61 – 14 – – – – – 16.500 0.438 0.69 0.63 – 3.83 3.73
R62 – – 14 – – – – 16.500 0.625 0.88 0.81 – 6.84 6.71
R63* – – – 14 – – – 16.500 1.000 1.31 1.25 0.22 16.20 16.67
R64 16 – – – – – – 17.875 0.313 0.56 0.50 – 2.47 2.29
R65* – 16 – – – 16 3/4** – 18.500 0.438 0.69 0.63 0.19 4.30 4.18
R66* – – 16 – – (16) – 18.500 0.625 0.88 0.81 0.16 7.67 7.53
R67 – – – 16 – – – 18.500 1.125 1.44 1.38 – 22.30 23.40
R68 18 – – – – – – 20.375 0.313 0.56 0.50 – 2.82 2.60
R69* – 18 – – – – – 21.000 0.438 0.69 0.63 0.19 4.87 4.74
R70* – – 18 – – (18) – 21.000 0.750 1.00 0.94 0.19 11.80 11.64
R71 – – – 18 – – – 21.000 1.125 1.44 1.38 – 25.20 26.50
R72 20 – – – – – – 22.000 0.313 0.56 0.50 – 3.04 2.81
R73* – 20 – – – 21 1/4** – 23.000 0.500 0.75 0.69 0.13 6.60 6.47
R74* – – 20 – – (20 3/4) – 23.000 0.750 1.00 0.94 0.19 12.95 12.75
R75 – – – 20 – – – 23.000 1.250 1.56 1.50 – 33.30 35.30
R76 24 – – – – – – 26.500 0.313 0.56 0.50 – 3.66 3.38
R77 – 24 – – – – – 27.250 0.625 0.88 0.81 – 11.30 11.10
R78 – – 24 – – – – 27.250 1.000 1.31 1.25 – 27.10 27.58
R79 – – – 24 – – – 27.250 1.375 1.75 1.63 0.19 48.70 49.75
R80 22 – – – – – – 24.250 0.313 – 0.50 – – 3.11
R81 – 22 – – – – – 25.000 0.563 – 0.75 – – 8.55
R82* – – – – – – – 2.250 0.438 – 0.63 0.19 – .508
R84* – – – – – – – 2.500 0.438 – 0.63 0.19 – .564
R85* – – – – – – – 3.125 0.500 – 0.69 0.13 – .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 0.750 – 0.94 0.19 – 2.735
R89* – – – – – – – 4.500 0.750 – 0.94 0.19 – 2.528
R90* – – – – – – – 6.125 0.875 – 1.06 0.19 – 4.55
R91* – – – – – – – 10.250 1.250 – 1.50 0.16 – 15.05
R92 – – – – – – – 9.000 0.438 0.69 0.63 – 2.07 2.02
R93 – 26 – – – – – 29.500 0.750 – 0.94 – – 16.33
R94 – 28 – – – – – 31.500 0.750 – 0.94 – – 17.44
R95 – 30 – – – – – 33.750 0.750 – 0.94 – – 18.69
R96 – 32 – – – – – 36.000 0.875 – 1.06 – – 26.65
R97 – 34 – – – – – 38.00 0.875 – 1.06 – – 28.13
R98 – 36 – – – – – 40.125 0.875 – 1.06 – – 29.79
R99* – – – – – – – 9.250 0.438 – 0.63 0.19 – 2.08
R100 – – 26 – – – – 29.500 1.125 – 1.38 –    
R101 – – 28 – – – – 31.500 1.250 – 1.50 –    
R102 – – 30 – – – – 33.750 1.250 – 1.50 –    
R103 – – 32 – – – – 36.000 1.250 – 1.50 –    
R104 – – 34 – – – – 38.00 1.375 – 1.63 –    
R105 – – 36 – – – – 40.250 1.375 – 1.63 –    
* 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.
 
STYLE RX
Dimensions in mm
NO.  

PITCH DIAMETER

OF RING

 OUTSIDE
DIAMETER
OF RING		 WIDTH
OF
RING		 HEIGHT
OF
RING		 WEIGHT,
lbs.
PRESSURE CLASS RATINGS
2000 3000 5000  
NOMINAL PIPE SIZE (INCHES) P OD A H  
RX20 – – – 68.26 76.20 8.73 19.05 0.527
RX20*** – – 2 1/16 68.26 76.20 8.73 19.05 0.527
RX23 2 1/16 – – 82.55 93.27 11.91 25.40 1.15
RX24 – 2 1/16 2 1/16 95.25 105.97 11.91 25.40 1.33
RX25*** – – 3 1/8 101.60 109.54 8.73 19.05 1.42
RX26 2 9/16 – – 101.60 111.92 11.91 25.40 1.50
RX27 – 2 9/16 2 9/16 107.95 118.27 11.91 25.40 1.73
RX31 3 1/8 3 1/8 – 123.83 134.54 11.91 25.40 1.91
RX35 – – 3 1/8 136.53 147.24 11.91 25.40 2.09
RX37 4 1/16 4 1/16 – 149.23 159.94 11.91 25.40 2.27
RX39 – – 4 1/16 161.93 172.64 11.91 25.40 2.54
RX41 – – – 180.98 191.69 11.91 25.40 2.72
RX44 – – – 193.68 204.39 11.91 25.40 2.96
RX45 7 1/16 7 1/16 – 211.14 211.93 11.91 25.40 3.66
RX46 – – 7 1/16 211.14 222.25 13.49 28.58 8.56
RX47 – – – 228.60 245.27 19.84 41.28 3.79
RX49 9 9 – 269.88 280.59 11.91 25.40 5.36
RX50 – – 9 269.88 283.37 16.67 31.75 4.56
RX53 11 11 – 323.85 334.57 11.91 25.40 6.45
RX54 – – 11 323.85 337.34 16.67 31.75 5.36
RX57 13 5/8 13 5/8 – 381.00 391.72 11.91 25.40 26.40
RX63 – – – 419.10 441.72 26.99 50.80 6.63
RX65 16 3/4 – – 469.90 480.62 11.91 25.40 9.39
RX66 – 16 3/4 – 469.90 483.39 16.67 31.75 7.52
RX69 – – – 533.40 544.12 11.91 25.40 20.14
RX70 – – – 533.40 550.07 19.84 41.28 11.63
RX73 21 1/4 – – 584.20 596.11 13.49 31.75 22.10
RX74 – 20 3/4 – 584.20 600.87 19.84 41.28 0.790
RX82 – – – 57.15 67.87 11.91 25.40 0.880
RX84 – – – 63.50 74.22 11.91 25.40 0.880
RX85 – – – 79.38 90.09 13.49 25.40 1.79
RX86 – – – 90.49 103.58 15.08 28.58 1.98
RX87 – – – 100.01 113.11 15.08 28.58 3.22
RX88 – – – 123.83 139.30 17.46 31.75 2.98
RX89 – – – 114.30 129.78 18.26 31.75 6.82
RX90 – – – 155.58 174.63 19.84 44.45 17.10
RX91 – – – 260.35 286.94 30.16 45.24 3.31
* RX99 – – – 234.95 245.67 11.91 25.40 –
RX201*** – – 1 3/8 46.04 46.04 5.74 11.30 –
RX205*** – – 1 13/16 57.15 62.31 5.56 11.10 –
* RX210*** – – 2 9/16 88.90 97.63 9.53 19.05 –
* RX215 – – 4 1/16 130.18 140.89 11.91 25.40 –
* RX215*** – – 4 1/16 x 4 1/4 130.18 140.89 11.91 25.40  
NO.  

PITCH DIAMETER

OF RING

 OUTSIDE
DIAMETER
OF RING		 WIDTH
OF
RING		 HEIGHT
OF
RING		 WEIGHT,
lbs.
PRESSURE CLASS RATINGS
2000 3000 5000  
NOMINAL PIPE SIZE (INCHES) P OD A H  
RX20 – – – 2.688 3.000 0.344 0.750 0.527
RX20*** – – 2 1/16 2.688 3.000 0.344 0.750 0.527
RX23 2 1/16 – – 3.250 3.672 0.469 1.000 1.15
RX24 – 2 1/16 2 1/16 3.750 4.172 0.469 1.000 1.33
RX25*** – – 3 1/8 4.000 4.313 0.344 0.750 1.42
RX26 2 9/16 – – 4.000 4.406 0.469 1.000 1.50
RX27 – 2 9/16 2 9/16 4.250 4.656 0.469 1.000 1.73
RX31 3 1/8 3 1/8 – 4.875 5.297 0.469 1.000 1.91
RX35 – – 3 1/8 5.375 5.797 0.469 1.000 2.09
RX37 4 1/16 4 1/16 – 5.875 6.297 0.469 1.000 2.27
RX39 – – 4 1/16 6.375 6.797 0.469 1.000 2.54
RX41 – – – 7.125 7.547 0.469 1.000 2.72
RX44 – – – 7.625 8.047 0.469 1.000 2.96
RX45 7 1/16 7 1/16 – 8.313 8.734 0.469 1.000 3.66
RX46 – – 7 1/16 8.313 8.750 0.531 1.125 8.56
RX47 – – – 9.000 9.656 0.781 1.625 3.79
RX49 9 9 – 10.625 11.047 0.469 1.000 5.36
RX50 – – 9 10.625 11.156 0.656 1.250 4.56
RX53 11 11 – 12.750 13.172 0.469 1.000 6.45
RX54 – – 11 12.750 13.281 0.656 1.250 5.36
RX57 13 5/8 13 5/8 – 15.000 15.422 0.469 1.000 26.40
RX63 – – – 16.500 17.391 1.063 2.000 6.63
RX65 16 3/4 – – 18.500 18.922 0.469 1.000 9.39
RX66 – 16 3/4 – 18.500 19.031 0.656 1.250 7.52
RX69 – – – 21.000 21.422 0.469 1.000 20.14
RX70 – – – 21.000 21.656 0.781 1.625 11.63
RX73 21 1/4 – – 23.000 23.469 0.531 1.250 22.10
RX74 – 20 3/4 – 23.000 23.656 0.781 1.625 0.790
RX82 – – – 2.250 2.672 0.469 1.000 0.880
RX84 – – – 2.500 2.922 0.469 1.000 0.880
RX85 – – – 3.125 3.547 0.531 1.000 1.79
RX86 – – – 3.563 4.078 0.594 1.125 1.98
RX87 – – – 3.938 4.453 0.594 1.125 3.22
RX88 – – – 4.875 5.484 0.688 1.250 2.98
RX89 – – – 4.500 5.109 0.719 1.250 6.82
RX90 – – – 6.125 6.875 0.781 1.750 17.10
RX91 – – – 10.250 11.297 1.188 1.781 3.31
* RX99 – – – 9.250 9.672 0.469 1.000 –
RX201*** – – 1 3/8 1.813 2.026 0.226 0.445  
RX205*** – – 1 13/16 2.250 2.453 0.219 0.437 –
* RX210*** – – 2 9/16 3.500 3.844 0.375 0.750 –
* RX215 – – 4 1/16 5.125 5.547 0.469 1.000 –
* RX215*** – – 4 1/16 x 4 1/4 5.125 5.547 0.469 1.000 –
* API allows more liberal tolerances on RX 201–215
***Denotes API Ring Type Joint gaskets for segmented flanges for dual completions to API Standard 6A.
 
STYLE BX
Dimensions in mm
NO.  

OUTSIDE
DIAMETER
OF RING

 HEIGHT
OF
RING		 WIDTH
OF
RING		 HOLE SIZE GASKET WEIGHT,
lbs.FOR API 6BX FLANGES
PRESSURE CLASS RATINGS
5000 10000 15000 20000  
NOMINAL PIPE SIZE (INCHES) OD H A D  
BX150 – – – – 72.19 9.30 9.30 1.59 0.295
BX151 – 1 13/16 1 13/16 1 13/16 76.40 9.63 9.63 1.59 0.337
BX152 – 2 1/16 2 1/16 2 1/16 84.68 10.24 10.24 1.59 0.425
BX153 – 2 9/16 2 9/16 2 9/16 100.94 11.38 11.38 1.59 0.632
BX154 – 3 1/16 3 1/16 3 1/16 116.84 12.40 12.40 1.59 0.875
BX155 – 4 1/16 4 1/16 4 1/16 147.96 14.22 14.22 1.59 1.22
BX156 – 7 1/16 7 1/16 7 1/16 237.92 18.62 18.62 3.18 4.14
BX157 – 9 9 9 294.46 20.98 20.98 3.18 6.55
BX158 – 11 11 11 352.04 23.14 23.14 3.18 9.60
BX159 – 13 5/8 13 5/8 13 5/8 426.72 25.70 25.70 3.18 14.41
BX160 13 5/8 – – – 402.59 23.83 13.74 3.18 6.75
BX161 16 3/4 – – – 491.41 28.07 16.21 3.18 –
BX162 16 3/4 16 3/4 16 3/4 – 475.49 14.22 14.22 1.59 –
BX163 18 3/4 – – – 556.16 30.10 17.37 3.18 –
BX164 – 18 3/4 18 3/4 – 570.56 30.10 24.59 3.18 –
BX165 21 1/4 – – – 624.71 32.03 18.49 3.18 –
BX166 – 21 1/4 – – 640.03 32.03 26.14 3.18 –
BX167* – – – – 759.36 35.87 13.11 1.59 –
BX168*** – – – – 765.25 35.87 16.05 1.59 –
BX169** – – – – 173.51 15.85 12.93 1.59 –
BX170 – – – – 218.03 14.22 14.22 1.59 –
BX171 – – – – 267.44 14.22 14.22 1.59 –
BX172 – – – – 333.07 14.22 14.22 1.59 –
BX303***- – – – – 852.75 37.95 16.97 1.59 –
NO.  

OUTSIDE
DIAMETER
OF RING

 HEIGHT
OF
RING		 WIDTH
OF
RING		 HOLE SIZE GASKET WEIGHT,
lbs.FOR API 6BX FLANGES
PRESSURE CLASS RATINGS
5000 10000 15000 20000  
NOMINAL PIPE SIZE (INCHES) OD H A D  
BX150 – – – – 2.842 0.366 0.366 0.06 0.295
BX151 – 1 13/16 1 13/16 1 13/16 3.008 0.379 0.379 0.06 0.337
BX152 – 2 1/16 2 1/16 2 1/16 3.334 0.403 0.403 0.06 0.425
BX153 – 2 9/16 2 9/16 2 9/16 3.974 0.448 0.448 0.06 0.632
BX154 – 3 1/16 3 1/16 3 1/16 4.600 0.488 0.488 0.06 0.875
BX155 – 4 1/16 4 1/16 4 1/16 5.825 0.560 0.560 0.06 1.22
BX156 – 7 1/16 7 1/16 7 1/16 9.367 0.733 0.733 0.12 4.14
BX157 – 9 9 9 11.593 0.826 0.826 0.12 6.55
BX158 – 11 11 11 13.860 0.911 0.911 0.12 9.60
BX159 – 13 5/8 13 5/8 13 5/8 16.800 1.012 1.012 0.12 14.41
BX160 13 5/8 – – – 15.850 0.938 0.541 0.12 6.75
BX161 16 3/4 – – – 19.347 1.105 0.638 0.12 –
BX162 16 3/4 16 3/4 16 3/4 – 18.720 0.560 0.560 0.06 –
BX163 18 3/4 – – – 21.896 1.185 0.684 0.12 –
BX164 – 18 3/4 18 3/4 – 22.463 1.185 0.968 0.12 –
BX165 21 1/4 – – – 24.595 1.261 0.728 0.12 –
BX166 – 21 1/4 – – 25.198 1.261 1.029 0.12 –
BX167* – – – – 29.896 1.412 0.516 0.06 –
BX168*** – – – – 30.128 1.412 0.632 0.06 –
BX169** – – – – 6.831 0.624 0.509 0.06 –
BX170 – – – – 8.584 0.560 0.560 0.06 –
BX171 – – – – 10.529 0.560 0.560 0.06 –
BX172 – – – – 13.113 0.560 0.560 0.06 –
BX303***- – – – – 33.573 1.494 0.668 0.06 –
* BX167 is suitable for 26 3/4 Nominal Pipe Size 2,000 psi rating.
** BX169 is suitable for 5 3/4 Nominal Pipe Size 10,000 psi rating.
*** BX168 is suitable for 26 3/4 Nominal Pipe Size 3,000 psi rating.
***- BX303 is suitable for 30 Nominal Pipe Size 2,000 and 3,000 psi ratings.
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