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ANSI / ASME CLASS 400 WELD NECK FLANGE DIMENSIONS

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weld neck flange dimensions

Class 400 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length Bore RF Diameter RF Height PCD Weld Face
A B C D E F G H I J
1/2 15 95 14.3 38 21.3 52 According to Schedule 34.9 7 66.7 1.6
3/4 20 115 15.9 48 26.7 57 42.9 7 82.6 1.6
1 25 125 17.5 54 33.4 62 50.8 7 88.9 1.6
1 1/4 32 135 20.7 64 42.2 67 63.5 7 98.4 1.6
1 1/2 40 155 22.3 70 48.3 70 73 7 114.3 1.6
2 50 165 25.4 84 60.3 73 92.1 7 127 1.6
2 1/2 65 190 28.6 100 73 79 104.8 7 149.2 1.6
3 80 210 31.8 117 88.9 83 127 7 168.3 1.6
3 1/2 90 230 35 133 101.6 86 139.7 7 184.2 1.6
4 100 255 35 146 114.3 89 157.2 7 200 1.6
5 125 280 38.1 178 141.3 102 185.7 7 235 1.6
6 150 320 41.3 206 168.3 103 215.9 7 269.9 1.6
8 200 380 47.7 260 219.1 117 269.9 7 330 1.6
10 250 445 54 321 273 124 323.8 7 387.4 1.6
12 300 520 57.2 375 323.8 137 381 7 450.8 1.6
14 350 585 60.4 425 355.6 149 412.8 7 514.4 1.6
16 400 650 63.5 483 406.4 152 469.9 7 571.5 1.6
18 450 710 66.7 533 457 165 533.4 7 628.6 1.6
20 500 775 69.9 587 508 168 584.2 7 685.8 1.6
24 600 915 76.2 702 610 175 692.2 7 812.8 1.6

Class 400 Weld Neck Flange Stud & Bolt Dimesions

Size in Inch Size in mm No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size
1/2 15 4 1/2 75 5/8 M14
3/4 20 4 5/8 90 3/4 M16
1 25 4 5/8 90 3/4 M16
1 1/4 32 4 5/8 95 3/4 M16
1 1/2 40 4 3/4 110 7/8 M20
2 50 8 5/8 110 3/4 M16
2 1/2 65 8 3/4 120 7/8 M20
3 80 8 3/4 125 7/8 M20
3 1/2 90 8 7/8 140 1 M24
4 100 8 7/8 140 1 M24
5 125 8 7/8 145 1 M24
6 150 12 7/8 150 1 M24
8 200 12 1 170 1 1/8 M27
10 250 16 1 1/8 190 1 1/4 M30
12 300 16 1 1/4 205 1 3/8 M33
14 350 20 1 1/4 210 1 3/8 M33
16 400 20 1 3/8 220 1 1/2 M36
18 450 24 1 3/8 230 1 1/2 M36
20 500 24 1 1/2 240 1 3/4 M39
24 600 24 1 3/4 265 1 7/8 M45