Flanges to American Standards (ANSI)
| NOM FLANGE SIZE | PN20 (CLASS 150) | PN50 (CLASS 300) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NOM FLANGE SIZE DN | NPS | PN20 (CLASS 150) DIA. | PCD | NO. BOLTS | DIA. BOLTS | STUD SIZE | BOLT SIZE | PN50 (CLASS 300) DIA. | PCD | NO. BOLTS | DIA. BOLTS | STUD SIZE | BOLT SIZE |
| NOM FLANGE SIZE 15 | 1/2 | PN20 (CLASS 150) 90 | 60.5 | 4 | 1/2 | 60 | 45 | PN50 (CLASS 300) 95 | 66.5 | 4 | 1/2 | 65 | 55 |
| NOM FLANGE SIZE 20 | 3/4 | PN20 (CLASS 150) 100 | 70 | 4 | 1/2 | 65 | 50 | PN50 (CLASS 300) 120 | 82.5 | 4 | 5/8 | 75 | 60 |
| NOM FLANGE SIZE 25 | 1 | PN20 (CLASS 150) 110 | 79.5 | 4 | 1/2 | 65 | 55 | PN50 (CLASS 300) 125 | 89 | 4 | 5/8 | 80 | 65 |
| NOM FLANGE SIZE 32 | 1(1/4) | PN20 (CLASS 150) 120 | 89 | 4 | 1/2 | 70 | 55 | PN50 (CLASS 300) 135 | 98.5 | 4 | 5/8 | 80 | 65 |
| NOM FLANGE SIZE 40 | 1(1/2) | PN20 (CLASS 150) 130 | 98.5 | 4 | 1/2 | 70 | 60 | PN50 (CLASS 300) 155 | 114.5 | 4 | 3/4 | 90 | 75 |
| NOM FLANGE SIZE 50 | 2 | PN20 (CLASS 150) 150 | 120.5 | 4 | 5/8 | 80 | 65 | PN50 (CLASS 300) 165 | 127 | 8 | 5/8 | 90 | 75 |
| NOM FLANGE SIZE 65 | 2(1/2) | PN20 (CLASS 150) 180 | 139.5 | 4 | 5/8 | 90 | 75 | PN50 (CLASS 300) 190 | 149 | 8 | 3/4 | 100 | 85 |
| NOM FLANGE SIZE 80 | 3 | PN20 (CLASS 150) 190 | 152.5 | 4 | 5/8 | 90 | 75 | PN50 (CLASS 300) 210 | 168.5 | 8 | 3/4 | 110 | 90 |
| NOM FLANGE SIZE 90 | 3(1/2) | PN20 (CLASS 150) 215 | 178 | 8 | 5/8 | 90 | 75 | PN50 (CLASS 300) 230 | 184 | 8 | 3/4 | 110 | 95 |
| NOM FLANGE SIZE 100 | 4 | PN20 (CLASS 150) 230 | 190.5 | 8 | 5/8 | 90 | 75 | PN50 (CLASS 300) 255 | 200 | 8 | 3/4 | 110 | 95 |
| NOM FLANGE SIZE 125 | 5 | PN20 (CLASS 150) 255 | 216 | 8 | 3/4 | 90 | 80 | PN50 (CLASS 300) 280 | 235 | 8 | 3/4 | 120 | 100 |
| NOM FLANGE SIZE 150 | 6 | PN20 (CLASS 150) 280 | 241.5 | 8 | 3/4 | 100 | 85 | PN50 (CLASS 300) 320 | 270 | 12 | 3/4 | 125 | 105 |
| NOM FLANGE SIZE 200 | 8 | PN20 (CLASS 150) 345 | 298.5 | 8 | 7/8 | 110 | 90 | PN50 (CLASS 300) 380 | 330 | 12 | 7/8 | 140 | 110 |
| NOM FLANGE SIZE 250 | 10 | PN20 (CLASS 150) 405 | 362 | 12 | 1 | 115 | 95 | PN50 (CLASS 300) 445 | 387.5 | 16 | 1 | 155 | 130 |
| NOM FLANGE SIZE 300 | 12 | PN20 (CLASS 150) 485 | 432 | 12 | 11/8 | 120 | 100 | PN50 (CLASS 300) 520 | 451 | 16 | 1(1/4) | 170 | 145 |
| NOM FLANGE SIZE 350 | 14 | PN20 (CLASS 150) 535 | 476 | 12 | 11/8 | 130 | 110 | PN50 (CLASS 300) 585 | 514.5 | 20 | 11/8 | 175 | 150 |
| NOM FLANGE SIZE 400 | 16 | PN20 (CLASS 150) 600 | 540 | 16 | 1(1/4) | 135 | 115 | PN50 (CLASS 300) 650 | 571.5 | 20 | 1(1/4) | 190 | 160 |
| NOM FLANGE SIZE 450 | 18 | PN20 (CLASS 150) 635 | 578 | 16 | 1(1/4) | 150 | 125 | PN50 (CLASS 300) 710 | 628.5 | 24 | 1(1/4) | 195 | 170 |
| NOM FLANGE SIZE 500 | 20 | PN20 (CLASS 150) 700 | 635 | 20 | 1(1/4) | 160 | 135 | PN50 (CLASS 300) 775 | 686 | 24 | 15/8 | 205 | 180 |
| NOM FLANGE SIZE 600 | 24 | PN20 (CLASS 150) 815 | 749.5 | 20 | 1(1/2) | 175 | 145 | PN50 (CLASS 300) 915 | 813 | 24 | 1(1/2) | 230 | 195 |
| NOM FLANGE SIZE 750 | 30 | PN20 (CLASS 150) 985 | 914 | 28 | 1(3/4) | 190 | 160 | PN50 (CLASS 300) 1090 | 997 | 28 | 1(3/4) | 290 | 250 |
| NOM FLANGE SIZE 900 | 36 | PN20 (CLASS 150) 1170 | 1086 | 32 | 2 | 215 | 180 | PN50 (CLASS 300) 1270 | 1168 | 32 | 2(1/2) | 325 | 280 |
| NOM FLANGE SIZE | PN100 (CLASS 600) | |||||
|---|---|---|---|---|---|---|
| NOM FLANGE SIZE DN | NPS | PN100 (CLASS 600) DIA. | PCD | NO. BOLTS | DIA. BOLTS | STUD SIZE |
| NOM FLANGE SIZE 15 | 1/2 | PN100 (CLASS 600) 95 | 66.5 | 4 | 1/2 | 80 |
| NOM FLANGE SIZE 20 | 3/4 | PN100 (CLASS 600) 120 | 82.5 | 4 | 5/8 | 90 |
| NOM FLANGE SIZE 25 | 1 | PN100 (CLASS 600) 125 | 89 | 4 | 5/8 | 90 |
| NOM FLANGE SIZE 32 | 1(1/4) | PN100 (CLASS 600) 135 | 98.5 | 4 | 5/8 | 100 |
| NOM FLANGE SIZE 40 | 1(1/2) | PN100 (CLASS 600) 155 | 114.5 | 4 | 3/4 | 105 |
| NOM FLANGE SIZE 50 | 2 | PN100 (CLASS 600) 165 | 127 | 8 | 5/8 | 105 |
| NOM FLANGE SIZE 65 | 2(1/2) | PN100 (CLASS 600) 190 | 149 | 8 | 3/4 | 120 |
| NOM FLANGE SIZE 80 | 3 | PN100 (CLASS 600) 210 | 168.5 | 8 | 3/4 | 125 |
| NOM FLANGE SIZE 90 | 3(1/2) | PN100 (CLASS 600) 230 | 184 | 8 | 7/8 | 140 |
| NOM FLANGE SIZE 100 | 4 | PN100 (CLASS 600) 275 | 216 | 8 | 7/8 | 145 |
| NOM FLANGE SIZE 125 | 5 | PN100 (CLASS 600) 330 | 267 | 8 | 1 | 165 |
| NOM FLANGE SIZE 150 | 6 | PN100 (CLASS 600) 355 | 292 | 12 | 1 | 170 |
| NOM FLANGE SIZE 200 | 8 | PN100 (CLASS 600) 420 | 349 | 12 | 11/8 | 195 |
| NOM FLANGE SIZE 250 | 10 | PN100 (CLASS 600) 510 | 432 | 16 | 1(1/4) | 215 |
| NOM FLANGE SIZE 300 | 12 | PN100 (CLASS 600) 560 | 489 | 20 | 1(1/4) | 220 |
| NOM FLANGE SIZE 350 | 14 | PN100 (CLASS 600) 605 | 527 | 20 | 13/8 | 235 |
| NOM FLANGE SIZE 400 | 16 | PN100 (CLASS 600) 685 | 603 | 20 | 1(1/2) | 255 |
| NOM FLANGE SIZE 450 | 18 | PN100 (CLASS 600) 745 | 654 | 20 | 15/8 | 275 |
| NOM FLANGE SIZE 500 | 20 | PN100 (CLASS 600) 815 | 724 | 24 | 15/8 | 290 |
| NOM FLANGE SIZE 600 | 24 | PN100 (CLASS 600) 940 | 838 | 24 | 17/8 | 330 |
| NOM FLANGE SIZE 750 | 30 | PN100 (CLASS 600) 1130 | 1022 | 28 | 2 | 355 |
| NOM FLANGE SIZE 900 | 36 | PN100 (CLASS 600) 1315 | 1194 | 28 | 2(1/2) | 400 |
| PN150 (CLASS 900) | ||||
|---|---|---|---|---|
| PN150 (CLASS 900) DIA. | PCD | NO. BOLTS | DIA. BOLTS | STUD SIZE |
| PN150 (CLASS 900) 120 | 82.5 | 4 | 3/4 | 105 |
| PN150 (CLASS 900) 130 | 89 | 4 | 3/4 | 115 |
| PN150 (CLASS 900) 150 | 101.5 | 4 | 7/8 | 125 |
| PN150 (CLASS 900) 160 | 111 | 4 | 7/8 | 125 |
| PN150 (CLASS 900) 180 | 124 | 4 | 1 | 140 |
| PN150 (CLASS 900) 215 | 165 | 8 | 7/8 | 145 |
| PN150 (CLASS 900) 245 | 190 | 8 | 1 | 160 |
| PN150 (CLASS 900) 240 | 190.5 | 8 | 7/8 | 145 |
| TEMPERATURE/PRESSURE RATINGS | ||||
|---|---|---|---|---|
| TEMPERATURE/PRESSURE RATINGS TEMPERATURE IN C° | MAXIMUM WORKING TEMPERATURE | |||
| TEMPERATURE/PRESSURE RATINGS DN | PN20 CLASS 150 | PN50 CLASS 300 | PN100 CLASS 600 | PN150 CLASS 900 |
| TEMPERATURE/PRESSURE RATINGS -29 to 38 | 1960 | 5110 | 10210 | 15320 |
| TEMPERATURE/PRESSURE RATINGS 50 | 1920 | 5010 | 10020 | 15020 |
| TEMPERATURE/PRESSURE RATINGS 100 | 1770 | 4640 | 9280 | 13910 |
NPE provides these calculators and guides to assist with general queries and recommends working with experts to ensure suitability.
NPE assumes no responsibility or liability for any errors, omissions or misuse of the contents of this site. These online tools do not constitute professional advice.
For assistance, contact any of NPE’s Australian branches.