A blind flange which is also known as a ‘closure plate flange’ is installed at the end of a pipe to close its end keeping in mind its future expansion and drainage requirements. It has no centre hole or bore, so there is no flow through the flange. They are mostly used for isolating a pipe, valve, or pressure vessel. Blind flanges are available in all sizes and classes, and may use a flat, raised, or ring-type joint face, according to type of gasket used.
150# Blind Flange Dimensions as per ASME B16.5
150# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 90 | 9.6 |
| 3/4 | 100 | 11.2 |
| 1 | 110 | 12.7 |
| 1-1/4 | 115 | 14.3 |
| 1-1/2 | 125 | 15.9 |
| 2 | 150 | 17.5 |
| 2-1/2 | 180 | 20.7 |
| 3 | 190 | 22.3 |
| 3-1/2 | 215 | 22.3 |
| 4 | 230 | 22.3 |
| 5 | 255 | 22.3 |
| 6 | 280 | 23.9 |
| 8 | 345 | 27 |
| 10 | 405 | 28.6 |
| 12 | 485 | 30.2 |
| 14 | 535 | 33.4 |
| 16 | 595 | 35 |
| 18 | 635 | 38.1 |
| 20 | 700 | 41.3 |
| 24 | 815 | 46.1 |
150# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 60.3 | 5/8 | 4 | 1/2 | 55 | NA | 50 |
| 3/4 | 69.9 | 5/8 | 4 | 1/2 | 65 | NA | 50 |
| 1 | 79.4 | 5/8 | 4 | 1/2 | 65 | 75 | 55 |
| 1-1/4 | 88.9 | 5/8 | 4 | 1/2 | 70 | 85 | 55 |
| 1-1/2 | 98.4 | 5/8 | 4 | 1/2 | 70 | 85 | 65 |
| 2 | 120.7 | 3/4 | 4 | 5/8 | 85 | 95 | 70 |
| 2-1/2 | 139.7 | 3/4 | 4 | 5/8 | 90 | 100 | 75 |
| 3 | 152.4 | 3/4 | 4 | 5/8 | 90 | 100 | 75 |
| 3-1/2 | 177.8 | 3/4 | 8 | 5/8 | 90 | 100 | 75 |
| 4 | 190.5 | 3/4 | 8 | 5/8 | 90 | 100 | 75 |
| 5 | 215.9 | 7/8 | 8 | 3/4 | 95 | 110 | 85 |
| 6 | 241.3 | 7/8 | 8 | 3/4 | 100 | 115 | 85 |
| 8 | 298.5 | 7/8 | 8 | 3/4 | 110 | 120 | 90 |
| 10 | 362 | 1 | 12 | 7/8 | 115 | 125 | 100 |
| 12 | 431.8 | 1 | 12 | 7/8 | 120 | 135 | 100 |
| 14 | 476.3 | 1-1/8 | 12 | 1 | 135 | 145 | 115 |
| 16 | 539.8 | 1-1/8 | 16 | 1 | 135 | 145 | 115 |
| 18 | 577.9 | 1-1/4 | 16 | 1-1/8 | 145 | 160 | 125 |
| 20 | 635 | 1-1/4 | 20 | 1-1/8 | 160 | 170 | 140 |
| 24 | 749.3 | 1-3/8 | 20 | 1-1/4 | 170 | 185 | 150 |
300# Blind Flange Dimensions as per ASME B16.5
300# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 95 | 12.7 |
| 3/4 | 115 | 14.3 |
| 1 | 125 | 15.9 |
| 1-1/4 | 135 | 17.5 |
| 1-1/2 | 155 | 19.1 |
| 2 | 165 | 20.7 |
| 2-1/2 | 190 | 23.9 |
| 3 | 210 | 27 |
| 3-1/2 | 230 | 28.6 |
| 4 | 255 | 30.2 |
| 5 | 280 | 33.4 |
| 6 | 320 | 35 |
| 8 | 380 | 39.7 |
| 10 | 445 | 46.1 |
| 12 | 520 | 49.3 |
| 14 | 585 | 52.4 |
| 16 | 650 | 55.6 |
| 18 | 710 | 58.8 |
| 20 | 775 | 62 |
| 24 | 915 | 68.3 |
300# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 66.7 | 5/8 | 4 | 1/2 | 65 | 75 | 55 |
| 3/4 | 82.6 | 3/4 | 4 | 5/8 | 75 | 90 | 65 |
| 1 | 88.9 | 3/4 | 4 | 5/8 | 75 | 90 | 65 |
| 1-1/4 | 98.4 | 3/4 | 4 | 5/8 | 85 | 95 | 70 |
| 1-1/2 | 114.3 | 7/8 | 4 | 3/4 | 90 | 100 | 75 |
| 2 | 127 | 3/4 | 8 | 5/8 | 90 | 100 | 75 |
| 2-1/2 | 149.2 | 7/8 | 8 | 3/4 | 100 | 115 | 85 |
| 3 | 168.3 | 7/8 | 8 | 3/4 | 110 | 120 | 90 |
| 3-1/2 | 184.2 | 7/8 | 8 | 3/4 | 110 | 125 | 95 |
| 4 | 200 | 7/8 | 8 | 3/4 | 115 | 125 | 95 |
| 5 | 235 | 7/8 | 8 | 3/4 | 120 | 135 | 110 |
| 6 | 269.9 | 7/8 | 12 | 3/4 | 120 | 140 | 110 |
| 8 | 330.2 | 1 | 12 | 7/8 | 140 | 150 | 120 |
| 10 | 387.4 | 1-1/8 | 16 | 1 | 160 | 170 | 140 |
| 12 | 450.8 | 1-1/4 | 16 | 1-1/8 | 170 | 185 | 145 |
| 14 | 514.4 | 1-1/4 | 20 | 1-1/8 | 180 | 190 | 160 |
| 16 | 571.5 | 1-3/8 | 20 | 1-1/4 | 190 | 205 | 165 |
| 18 | 628.6 | 1-3/8 | 24 | 1-1/4 | 195 | 210 | 170 |
| 20 | 685.8 | 1-3/8 | 24 | 1-1/4 | 205 | 220 | 185 |
| 24 | 812.8 | 1-5/8 | 24 | 1-1/2 | 230 | 255 | 205 |
400# Blind Flange Dimensions as per ASME B16.5
400# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 95 | 14.3 |
| 3/4 | 115 | 15.9 |
| 1 | 125 | 17.5 |
| 1-1/4 | 135 | 20.7 |
| 1-1/2 | 155 | 22.3 |
| 2 | 165 | 25.4 |
| 2-1/2 | 190 | 28.6 |
| 3 | 210 | 31.8 |
| 3-1/2 | 230 | 35 |
| 4 | 255 | 35 |
| 5 | 280 | 38.1 |
| 6 | 320 | 41.3 |
| 8 | 380 | 47.7 |
| 10 | 445 | 54 |
| 12 | 520 | 57.2 |
| 14 | 585 | 60.4 |
| 16 | 650 | 63.5 |
| 18 | 710 | 66.7 |
| 20 | 775 | 69.9 |
| 24 | 915 | 76.2 |
400# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 66.7 | 5/8 | 4 | 1/2 | 75 | 70 | 75 |
| 3/4 | 82.6 | 3/4 | 4 | 5/8 | 90 | 85 | 90 |
| 1 | 88.9 | 3/4 | 4 | 5/8 | 90 | 85 | 90 |
| 1-1/4 | 98.4 | 3/4 | 4 | 5/8 | 95 | 90 | 95 |
| 1-1/2 | 114.3 | 7/8 | 4 | 3/4 | 110 | 100 | 110 |
| 2 | 127 | 3/4 | 8 | 5/8 | 110 | 100 | 110 |
| 2-1/2 | 149.2 | 7/8 | 8 | 3/4 | 120 | 115 | 120 |
| 3 | 168.3 | 7/8 | 8 | 3/4 | 125 | 120 | 125 |
| 3-1/2 | 184.2 | 1 | 8 | 7/8 | 140 | 135 | 140 |
| 4 | 200 | 1 | 8 | 7/8 | 140 | 135 | 140 |
| 5 | 235 | 1 | 8 | 7/8 | 145 | 135 | 145 |
| 6 | 269.9 | 1 | 12 | 7/8 | 150 | 145 | 150 |
| 8 | 330 | 1-1/8 | 12 | 1 | 170 | 165 | 170 |
| 10 | 387.4 | 1-1/4 | 16 | 1-1/8 | 190 | 185 | 190 |
| 12 | 450.8 | 1-3/8 | 16 | 1-1/4 | 205 | 195 | 205 |
| 14 | 514.4 | 1-3/8 | 20 | 1-1/4 | 210 | 205 | 210 |
| 16 | 571.5 | 1-1/2 | 20 | 1-3/8 | 220 | 215 | 220 |
| 18 | 628.6 | 1-1/2 | 24 | 1-3/8 | 230 | 220 | 230 |
| 20 | 685.8 | 1-5/8 | 24 | 1-1/2 | 240 | 235 | 250 |
| 24 | 812.8 | 1-7/8 | 24 | 1-3/4 | 265 | 260 | 280 |
600# Blind Flange Dimensions as per ASME B16.5
150# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 95 | 14.3 |
| 3/4 | 115 | 15.9 |
| 1 | 125 | 17.5 |
| 1-1/4 | 135 | 20.7 |
| 1-1/2 | 155 | 22.3 |
| 2 | 165 | 25.4 |
| 2-1/2 | 190 | 28.6 |
| 3 | 210 | 31.8 |
| 3-1/2 | 230 | 35 |
| 4 | 275 | 38.1 |
| 5 | 330 | 44.5 |
| 6 | 355 | 47.7 |
| 8 | 420 | 55.6 |
| 10 | 510 | 63.5 |
| 12 | 560 | 66.7 |
| 14 | 605 | 69.9 |
| 16 | 685 | 76.2 |
| 18 | 745 | 82.6 |
| 20 | 815 | 88.9 |
| 24 | 940 | 101.6 |
600# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 66.7 | 5/8 | 4 | 1/2 | 75 | 70 | 75 |
| 3/4 | 82.6 | 3/4 | 4 | 5/8 | 90 | 85 | 90 |
| 1 | 88.9 | 3/4 | 4 | 5/8 | 90 | 85 | 90 |
| 1-1/4 | 98.4 | 3/4 | 4 | 5/8 | 95 | 90 | 95 |
| 1-1/2 | 114.3 | 7/8 | 4 | 3/4 | 110 | 100 | 110 |
| 2 | 127 | 3/4 | 8 | 5/8 | 110 | 100 | 110 |
| 2-1/2 | 149.2 | 7/8 | 8 | 3/4 | 120 | 115 | 120 |
| 3 | 168.3 | 7/8 | 8 | 3/4 | 125 | 120 | 125 |
| 3-1/2 | 184.2 | 1 | 8 | 7/8 | 140 | 135 | 140 |
| 4 | 215.9 | 1 | 8 | 7/8 | 145 | 140 | 145 |
| 5 | 266.7 | 1-1/8 | 8 | 1 | 165 | 160 | 165 |
| 6 | 292.1 | 1-1/8 | 12 | 1 | 170 | 165 | 170 |
| 8 | 349.2 | 1-1/4 | 12 | 1-1/8 | 190 | 185 | 195 |
| 10 | 431.8 | 1-3/8 | 16 | 1-1/4 | 215 | 210 | 215 |
| 12 | 489 | 1-3/8 | 20 | 1-1/4 | 220 | 215 | 220 |
| 14 | 527 | 1-1/2 | 20 | 1-3/8 | 235 | 230 | 235 |
| 16 | 603.2 | 1-5/8 | 20 | 1-1/2 | 255 | 250 | 255 |
| 18 | 654 | 1-3/4 | 20 | 1-5/8 | 275 | 265 | 275 |
| 20 | 723.9 | 1-3/4 | 24 | 1-5/8 | 285 | 280 | 290 |
| 24 | 838.2 | 2 | 24 | 1-7/8 | 330 | 325 | 335 |
900# Blind Flange Dimensions as per ASME B16.5
150# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 120 | 22.3 |
| 3/4 | 130 | 25.4 |
| 1 | 150 | 28.6 |
| 1-1/4 | 160 | 28.6 |
| 1-1/2 | 180 | 31.8 |
| 2 | 215 | 38.1 |
| 2-1/2 | 245 | 41.3 |
| 3 | 240 | 38.1 |
| 4 | 290 | 44.5 |
| 5 | 350 | 50.8 |
| 6 | 380 | 55.6 |
| 8 | 470 | 63.5 |
| 10 | 545 | 69.9 |
| 12 | 610 | 79.4 |
| 14 | 640 | 85.8 |
| 16 | 705 | 88.9 |
| 18 | 785 | 101.6 |
| 20 | 855 | 108 |
| 24 | 1040 | 139.7 |
900# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 82.6 | 7/8 | 4 | 3/4 | 110 | 100 | 110 |
| 3/4 | 88.9 | 7/8 | 4 | 3/4 | 115 | 110 | 115 |
| 1 | 101.6 | 1 | 4 | 7/8 | 125 | 120 | 125 |
| 1-1/4 | 111.1 | 1 | 4 | 7/8 | 125 | 120 | 125 |
| 1-1/2 | 123.8 | 1-1/8 | 4 | 1 | 140 | 135 | 140 |
| 2 | 165.1 | 1 | 8 | 7/8 | 145 | 140 | 145 |
| 2-1/2 | 190.5 | 1-1/8 | 8 | 1 | 160 | 150 | 160 |
| 3 | 190.5 | 1 | 8 | 7/8 | 145 | 140 | 145 |
| 4 | 235 | 1-1/4 | 8 | 1-1/8 | 170 | 165 | 170 |
| 5 | 279.4 | 1-3/8 | 8 | 1-1/4 | 190 | 185 | 190 |
| 6 | 317.5 | 1-1/4 | 12 | 1-1/8 | 190 | 185 | 195 |
| 8 | 393.7 | 1-1/2 | 12 | 1-3/8 | 220 | 215 | 220 |
| 10 | 469.9 | 1-1/2 | 16 | 1-3/8 | 235 | 230 | 235 |
| 12 | 533.4 | 1-1/2 | 20 | 1-3/8 | 255 | 250 | 255 |
| 14 | 558.8 | 1-5/8 | 20 | 1-1/2 | 275 | 265 | 280 |
| 16 | 616 | 1-3/4 | 20 | 1-5/8 | 285 | 280 | 290 |
| 18 | 685.8 | 2 | 20 | 1-7/8 | 325 | 320 | 335 |
| 20 | 749.3 | 2-1/8 | 20 | 2 | 350 | 345 | 360 |
| 24 | 901.7 | 2 5/8 | 20 | 2-1/2 | 440 | 430 | 455 |
1500# Blind Flange Dimensions as per ASME B16.5
1500# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 120 | 22.3 |
| 3/4 | 130 | 25.4 |
| 1 | 150 | 28.6 |
| 1-1/4 | 160 | 28.6 |
| 1-1/2 | 180 | 31.8 |
| 2 | 215 | 38.1 |
| 2-1/2 | 245 | 41.3 |
| 3 | 265 | 47.7 |
| 4 | 310 | 54 |
| 5 | 375 | 73.1 |
| 6 | 395 | 82.6 |
| 8 | 485 | 92.1 |
| 10 | 585 | 108 |
| 12 | 675 | 123.9 |
| 14 | 750 | 133.4 |
| 16 | 825 | 146.1 |
| 18 | 915 | 162 |
| 20 | 985 | 177.8 |
| 24 | 1170 | 203.2 |
1500# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 82.6 | 7/8 | 4 | 3/4 | 110 | 100 | 110 |
| 3/4 | 88.9 | 7/8 | 4 | 3/4 | 115 | 110 | 115 |
| 1 | 101.6 | 1 | 4 | 7/8 | 125 | 120 | 125 |
| 1-1/4 | 111.1 | 1 | 4 | 7/8 | 125 | 120 | 125 |
| 1-1/2 | 123.8 | 1-1/8 | 4 | 1 | 140 | 135 | 140 |
| 2 | 165.1 | 1 | 8 | 7/8 | 145 | 140 | 145 |
| 2-1/2 | 190.5 | 1-1/8 | 8 | 1 | 160 | 150 | 160 |
| 3 | 203.2 | 1-1/4 | 8 | 1-1/8 | 180 | 170 | 180 |
| 4 | 241.3 | 1 | 8 | 1-1/4 | 195 | 190 | 195 |
| 5 | 292.1 | 1-3/8 | 8 | 1-1/2 | 250 | 240 | 250 |
| 6 | 317.5 | 1-1/2 | 12 | 1-3/8 | 260 | 255 | 265 |
| 8 | 393.7 | 1-3/4 | 12 | 1-3/8 | 290 | 285 | 325 |
| 10 | 482.6 | 2 | 12 | 1-7/8 | 335 | 330 | 345 |
| 12 | 571.5 | 2-1/8 | 16 | 2 | 375 | 370 | 385 |
| 14 | 635 | 2-3/8 | 16 | 2-1/4 | 405 | 400 | 425 |
| 16 | 704.8 | 2-5/8 | 16 | 2-1/2 | 445 | 440 | 470 |
| 18 | 774.7 | 2-7/8 | 16 | 2-3/4 | 495 | 490 | 525 |
| 20 | 831.8 | 3-1/8 | 16 | 3 | 540 | 535 | 565 |
| 24 | 990.6 | 3-5/8 | 16 | 3-1/2 | 615 | 610 | 650 |
2500# Blind Flange Dimensions as per ASME B16.5
2500# Flange Body Dimensions
| NPS | O Flange OD | tf Flange Thickness |
|---|---|---|
| 1/2 | 135 | 30.2 |
| 3/4 | 140 | 31.8 |
| 1 | 160 | 35 |
| 1-1/4 | 185 | 38.1 |
| 1-1/2 | 205 | 44.5 |
| 2 | 235 | 50.9 |
| 2-1/2 | 265 | 57.2 |
| 3 | 305 | 66.7 |
| 4 | 355 | 76.2 |
| 5 | 420 | 92.1 |
| 6 | 485 | 108 |
| 8 | 550 | 127 |
| 10 | 675 | 165.1 |
| 12 | 760 | 184.2 |
| NPS | O Flange OD | tf Flange Thickness |
2500# Bolts Template
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
|---|---|---|---|---|---|---|---|
| 1/2 | 88.9 | 7/8 | 4 | 3/4 | 120 | 115 | 120 |
| 3/4 | 95.2 | 7/8 | 4 | 3/4 | 125 | 120 | 125 |
| 1 | 108 | 1 | 4 | 7/8 | 140 | 135 | 140 |
| 1-1/4 | 130.2 | 1-1/8 | 4 | 1 | 150 | 145 | 150 |
| 1-1/2 | 146 | 1-1/4 | 4 | 1-1/8 | 170 | 165 | 170 |
| 2 | 171.4 | 1-1/8 | 8 | 1 | 180 | 170 | 180 |
| 2-1/2 | 196.8 | 1-1/4 | 8 | 1-1/8 | 195 | 190 | 205 |
| 3 | 228.6 | 1-3/8 | 8 | 1-1/4 | 220 | 215 | 230 |
| 4 | 273 | 1-5/8 | 8 | 1-1/2 | 255 | 250 | 260 |
| 5 | 323.8 | 1-7/8 | 8 | 1-3/4 | 300 | 290 | 310 |
| 6 | 368.3 | 2-1/8 | 8 | 2 | 345 | 335 | 355 |
| 8 | 438.2 | 2-1/8 | 12 | 2 | 380 | 375 | 395 |
| 10 | 539.8 | 2-5/8 | 12 | 2-1/2 | 490 | 485 | 510 |
| 12 | 619.1 | 2-7/8 | 12 | 2-3/4 | 540 | 535 | 560 |
| NPS | BCD Bolt Circle Dia. | BHD Bolt Hole Dia | BOLTS Number of Bolts | BD Dia. Of Bolt | SBL RF Stud Bolt Length (RF) | SBL RJ Stud Bolt Length (RJ) | MBL RF Machine Bolt Length (RF) |
General Notes
Dimensions are in millimeters, except for diameters of bolts and bolt holes, which are in inch units.
