API Flanges

API Flange and Joint Dimensions



API
Pressure
Rating		 Flange Ring Groove Bolt Studs
Nominal
Size		 Outside
Diameter		 T P E
Width		 Ring
No		 D Bolt
Circle		 No. Size Stud
Length
in mm in mm in mm in mm in mm in mm in mm
2000 psi
13.8 MPa
(R or RX
Gasket)		 2-1/16 52.4 6-1/2 165 1-5/16 33.3 3-1/4 82.55 15/32 11.91 23 5 127.0 8 5/8 4-1/2 108
2-9/16 65.1 7-1/2 191 1-7/16 36.5 4 101.60 15/32 11.91 26 5-7/8 149.2 8 3/4 5 127
3-1/8 79.4 8-1/4 210 1-9/16 39.7 4-7/8 123.83 15/32 11.91 31 6-5/8 168.3 8 3/4 5-1/4 133
4-1/16 103.2 10-3/4 273 1-13/16 46.0 5-7/8 149.23 15/32 11.91 37 8-1/2 215.9 8 7/8 6 152
5-1/8 130.0 13 330 2-1/16 52.4 7-1/8 180.98 15/32 11.91 41 10-1/2 266.7 8 1 6-3/4 165
7-1/16 179.4 14 356 2-3/16 55.6 8-5/16 211.14 15/32 11.91 45 11-1/2 292.1 12 1 7 178
9 228.6 16-1/2 419 2-1/2 63.5 10-5/8 269.88 15/32 11.91 49 13-3/4 349.3 12 1-1/8 8 203
11 279.4 20 508 2-13/16 71.4 12-3/4 323.85 15/32 11.91 53 17 431.8 16 1-1/4 8-3/4 222
13-5/8 346.1 22 559 2-15/16 74.6 15 381.00 15/32 11.91 57 19-1/4 489.0 20 1-1/4 9 229
16-3/4 425.5 27 686 3-5/16 84.1 18-1/2 469.90 15/32 11.91 65 23-3/4 603.3 20 1-1/2 10-1/4 260
21-1/4 539.8 32 813 3-7/8 98.4 23 584.20 17/32 13.49 73 28-1/2 723.9 24 1-5/8 11-3/4 298
3000 psi
20.7 MPa
(R or RX
Gasket)		 2-1/16 52.4 8-1/2 216 1-13/16 46.0 3-3/4 95.25 15/32 11.91 24 6-1/2 165.1 8 7/8 6 152
2-9/16 65.1 9-5/8 244 1-15/16 49.2 4-1/4 107.95 15/32 11.91 27 7-1/2 190.5 8 1 6-1/2 165
3-1/8 79.4 9-1/2 241 1-13/16 46.0 4-7/8 123.83 15/32 11.91 31 7-1/2 190.5 8 7/8 6 152
4-1/16 103.2 11-1/2 292 2-1/16 52.4 5-7/8 149.23 15/32 11.91 37 9-1/4 235.0 8 1-1/8 7 178
5-1/8 130.0 13-1/4 350 2-5/16 58.8 7-1/8 180.98 15/32 11.91 41 11 279.4 8 1-1/4 7-3/4 195
7-1/16 179.4 15 381 2-1/2 63.5 8-5/16 211.14 15/32 11.91 45 12-1/2 317.5 12 1-1/8 8 203
9 228.6 18-1/2 470 2-13/16 71.4 10-5/8 269.88 15/32 11.91 49 15-1/2 393.7 12 1-3/8 9 229
11 279.4 21-1/2 546 3-1/16 77.8 12-3/4 323.85 15/32 11.91 53 18-1/2 469.9 16 1-3/8 9-1/2 241
13-5/8 346.1 24 610 3-7/16 87.3 15 381.00 15/32 11.91 57 21 533.4 20 1-3/8 10-1/4 260
16-3/4 425.5 27-3/4 705 3-15/16 100.0 18-1/2 469.90 21/32 16.67 66 24-1/4 616.0 20 1-5/8 11-3/4 298
20-3/4 527.1 33-3/4 857 4-3/4 120.7 23 584.20 25/32 19.84 74 29-1/2 749.3 20 2 14-1/2 368
5000 psi
34.5 MPa
(R or RX
Gasket)		 2-1/16 52.4 8-1/2 216 1-13/16 46.0 3-3/4 95.25 15/32 11.91 24 6-1/2 165.1 8 7/8 6 152
2-9/16 65.1 9-5/8 244 1-15/16 49.2 4-1/4 107.95 15/32 11.91 27 7-1/2 190.5 8 1 6-1/2 165
3-1/8 79.4 10-1/2 267 2-3/16 55.6 5-3/8 136.53 15/32 11.91 35 8 203.2 8 1-1/8 7-1/4 184
4-1/16 103.2 12-1/4 311 2-7/16 61.9 6-3/8 161.93 15/32 11.91 39 9-1/2 241.3 8 1-1/4 8 203
5-1/8 130.0 14-3/4 375 3-3/16 81.0 7-5/8 193.68 15/32 11.91 44 11-1/2 292.1 8 1-1/2 10 255
7-1/16 179.4 15-1/2 394 3-5/8 92.1 8-5/16 211.14 17/32 13.49 46 12-1/2 317.5 12 1-3/8 10-3/4 273
9 228.6 19 483 4-1/16 103.2 10-5/8 269.88 21/32 16.67 50 15-1/2 393.7 12 1-5/8 12 305
11 279.4 23 584 4-11/16 119.1 12-3/4 323.85 21/32 16.67 54 19 482.6 12 1-7/8 13-3/4 349

API
Pressure
Rating		 Flange Ring Groove Bolt Studs
Nominal
Size		 A Outside
Diameter		 T G E
Width		 Ring
No		 D Bolt
Circle		 No. Size Stud
Length
in mm in mm in mm in mm in mm in mm in mm
5000 psi
34.5 MPa
(BX Gasket)		 13-5/8 346.1 26-1/2 673 4-7/16 112.7 16.063 408.00 0.786 19.96 BX-160 23-1/4 590.6 16 1-5/8 12-1/4 318
16-3/4 425.5 30-3/8 772 5-1/8 130.2 18.832 478.33 0.705 17.91 BX-162 26-5/8 676.3 16 1-7/8 14-1/2 368
18-3/4 476.3 35-5/8 905 6-17/32 165.9 22.185 563.50 1.006 25.55 BX-163 31-5/8 803.3 20 2 17-1/2 445
21-1/4 539.8 39 991 7-1/8 181.0 24.904 632.56 1.071 27.20 BX-165 34-7/8 885.8 24 2 18-3/4 476
10,000 psi
69.0 MPa
(BX Gasket)		 1-13/16 46.0 7-3/8 187 1-21/32 42.1 3.062 77.77 0.466 11.84 BX-151 5-3/4 146.1 8 3/4 5 127
2-1/16 52.4 7-7/8 200 1-47/64 44.1 3.395 86.23 0.498 12.65 BX-152 6-1/4 158.8 8 3/4 5-1/4 133
2-9/16 65.1 9-1/8 232 2-1/64 51.2 4.046 102.77 0.554 14.07 BX-153 7-1/4 184.2 8 7/8 6 152
3-1/16 77.8 10-5/8 270 2-19/64 58.3 4.685 119.00 0.606 15.39 BX-154 8-1/2 215.9 8 1 6-3/4 171
4-1/16 103.2 12-7/16 316 2-49/64 70.2 5.930 150.62 0.698 17.73 BX-155 10-3/16 258.8 8 1-1/8 8 203
5-1/8 130.2 14-1/16 357 3-1/8 79.4 6.955 176.66 0.666 16.92 BX-169 11-13/16 300.0 12 1-1/8 8-3/4 222
7-1/16 179.4 18-7/8 479 4-1/16 103.2 9.521 241.83 0.921 23.39 BX-156 15-7/8 403.2 12 1-1/2 11-1/4 286
9 228.6 21-3/4 552 4-7/8 123.8 11.774 299.06 1.039 26.39 BX-157 18-3/4 476.3 16 1-1/2 13 330
11 279.4 25-3/4 654 5-9/16 141.3 14.064 357.23 1.149 29.18 BX-158 22-1/4 565.2 16 1-3/4 15 381
13-5/8 346.1 30-1/4 768 6-5/8 168.3 17.033 432.64 1.279 32.49 BX-159 26-1/2 673.1 20 1-7/8 17-1/4 438
16-3/4 425.5 34-5/16 872 6-5/8 168.3 18.832 478.33 0.705 17.91 BX-162 30-9/16 776.3 24 1-7/8 17-1/2 445
18-3/4 476.3 40-15/16 1040 8-25/32 223.0 22.752 577.90 1.290 32.77 BX-164 36-7/16 925.5 24 2-1/4 22-1/2 572
21-1/4 539.8 45 1143 9-1/2 241.3 25.507 6647.88 1.373 34.87 BX-166 40-1/4 1022.4 24 2-1/2 24-1/2 622
15,000 psi
103.5 MPa
(BX Gasket)		 1-13/16 46.0 8-3/16 208 1-25/32 45.2 3.062 77.77 0.466 11.84 BX-151 6-5/16 160.3 8 7/8 5-1/2 140
2-1/16 52.4 8-3/4 222 2 50.8 3.395 86.23 0.498 12.65 BX-152 6-7/8 174.6 8 7/8 6 152
2-9/16 65.1 10 254 2-1/4 57.2 4.046 102.77 0.554 14.07 BX-153 7-7/8 200.0 8 1 6-3/4 171
3-1/16 77.8 11-5/16 287 2-17/32 64.3 4.685 119.00 0.606 15.39 BX-154 9-1/16 230.2 8 1-1/8 7-1/2 191
4-1/16 103.2 14-3/16 360 3-3/32 78.6 5.930 150.62 0.698 17.73 BX-155 11-7/16 290.5 8 1-3/8 9-1/4 235
7-1/16 179.4 19-7/8 505 4-11/16 119.1 9.521 241.83 0.921 23.39 BX-156 16-7/8 428.6 16 1-1/2 12-3/4 324
9 228.6 25-1/2 648 5-3/4 146.1 11.774 299.06 1.039 26.39 BX-157 21-3/4 552.5 16 1-7/8 15-3/4 400
11 279.4 32 813 7-3/8 187.3 14.064 357.23 1.149 29.18 BX-158 28 711.2 20 2 19-1/4 489
13-5/8 346.1 34-7/8 886 8-1/16 204.8 17.033 432.64 1.279 32.49 BX-159 30-7/8 784.2 20 2-1/4 21-1/4 540
18-3/4 476.3 45-3/4 1162 10-1/16 255.6 22.752 577.90 1.290 32.77 BX-164 40 1016.0 20 3 26-3/4 679
20,000 psi
138.0 MPa
(BX Gasket)		 1-13/16 46.0 10-1/8 257 2-1/22 63.5 3.062 77.77 0.466 11.84 BX-151 8 203.2 8 1 7-1/2 191
2-1/16 52.4 11-5/16 287 2-13/16 71.4 3.395 86.23 0.498 12.65 BX-152 9-1/16 230.2 8 1-1/8 8-1/4 210
2-9/16 65.1 12-13/16 325 3-1/8 79.4 4.046 102.77 0.554 14.07 BX-153 10-5/16 261.9 8 1-1/4 9-1/4 235
3-1/16 77.8 14-1/16 357 3-3/8 85.7 4.685 119.00 0.606 15.39 BX-154 11-5/16 287.3 8 1-3/8 10 254
4-1/16 103.2 17-9/16 446 4-3/16 106.4 5.930 150.62 0.698 17.73 BX-155 14-1/16 357.2 8 1-3/4 12-1/4 311
7-1/16 179.4 25-16/16 656 6-1/2 165.1 9.521 241.83 0.921 23.39 BX-156 21-13/16 554.0 16 2 17-1/2 445
9 228.6 31-11/16 805 8-1/16 204.8 11.774 299.06 1.039 26.39 BX-157 27 685.8 16 2-1/2 22-3/8 568
11 279.4 34-3/4 883 8-13/16 223.8 14.064 357.23 1.149 29.18 BX-158 29-1/2 749.3 16 2-3/4 23-3/4 603
13-5/8 346.1 35-3/4 1162 11-1/2 292.1 17.033 432.64 1.279 32.49 BX-159 40 1016.0 20 3-1/8 30 762

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