Nominal diameter d1 (mm) d3 (mm)
Class 150 Class 300 Class 400 Class 600 Class 900 Class 1500 Class 2500
1/2 23.8 44.5 50.8 50.8 50.8 60.4 60.4 66.8
3/4 31.8 54 63.5 63.5 63.5 66.7 66.7 73.1
1 36.5 63.5 69.9 69.9 69.9 76.2 76.2 82.5
1 1/4 46 73 79.4 79.4 79.4 85.8 85.8 101.6
1 1/2 52.4 82.6 92.1 92.1 92.1 95.3 95.3 114.3
2 73.2 101.6 108 108 108 139.7 139.7 143
2 1/2 85.9 120.6 127 127 127 161.9 161.9 165.1
3 107.8 133.4 146.1 146.1 146.1 165.1 171.5 193.8
4 131.8 171.5 177.8 174.7 190.5 203.2 206.5 231.9
5 152.4 193.8 212.8 209.5 238.2 244.6 250.9 276.3
6 190.5 219.1 247.7 244.5 263.6 285.8 279.4 314.5
8 238.3 276.3 304.8 301.7 317.5 355.6 349.3 384.3
10 285.8 336.6 358.8 355.6 396.9 431.8 431.8 473.2
12 342.9 406.4 419.1 415.9 454.1 495.3 517.6 546.1
14 374.7 447.7 482.6 479.5 489 517.6 574.7 -
16 425.5 511.2 536.6 533.4 562 571.5 638.2 -
18 489 546.1 593.7 590.6 609.6 635 701.8 -
20 533.4 603.3 650.9 644.5 679.5 695.5 752.5 -
24 641.4 714.4 771.6 765.3 787.4 835.1 898.6 -