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Weld neck flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47.
During a dimensional inspection of weld neck flange, you should check for
- Outer & Inner Diameter of body
- Bolt Circle & Bolt hole Diameter
- the thickness of weld end
- Length of the Hub and
- Straightness and alignment of the bolt hole
Class 150 Weld Neck Flange Dimensions
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 | 90 | 9.6 | 30 | 21.3 | 46 | Welding Neck bore is derived from the pipe schedule | 34.9 | 2 | 60.3 | 1.6 |
3/4 | 20 | 100 | 11.2 | 38 | 26.7 | 51 | 42.9 | 2 | 69.9 | 1.6 | |
1 | 25 | 110 | 12.7 | 49 | 33.4 | 54 | 50.8 | 2 | 79.4 | 1.6 | |
1 1/4 | 32 | 115 | 14.3 | 59 | 42.2 | 56 | 63.5 | 2 | 88.9 | 1.6 | |
1 1/2 | 40 | 125 | 15.9 | 65 | 48.3 | 60 | 73 | 2 | 98.4 | 1.6 | |
2 | 50 | 150 | 17.5 | 78 | 60.3 | 62 | 92.1 | 2 | 120.7 | 1.6 | |
2 1/2 | 65 | 180 | 20.7 | 90 | 73 | 68 | 104.8 | 2 | 139.7 | 1.6 | |
3 | 80 | 190 | 22.3 | 108 | 88.9 | 68 | 127 | 2 | 152.4 | 1.6 | |
3 1/2 | 90 | 215 | 22.3 | 122 | 101.6 | 70 | 139.7 | 2 | 177.8 | 1.6 | |
4 | 100 | 230 | 22.3 | 135 | 114.3 | 75 | 157.2 | 2 | 190.5 | 1.6 | |
5 | 125 | 255 | 22.3 | 164 | 141.3 | 87 | 185.7 | 2 | 215.9 | 1.6 | |
6 | 150 | 280 | 23.9 | 192 | 168.3 | 87 | 215.9 | 2 | 241.3 | 1.6 | |
8 | 200 | 345 | 27 | 246 | 219.1 | 100 | 269.9 | 2 | 298.5 | 1.6 | |
10 | 250 | 405 | 28.6 | 305 | 273 | 100 | 323.8 | 2 | 362 | 1.6 | |
12 | 300 | 485 | 30.2 | 365 | 323.8 | 113 | 381 | 2 | 431.8 | 1.6 | |
14 | 350 | 535 | 33.4 | 400 | 355.6 | 125 | 412.8 | 2 | 476.3 | 1.6 | |
16 | 400 | 595 | 35 | 457 | 406.4 | 125 | 469.9 | 2 | 539.8 | 1.6 | |
18 | 450 | 635 | 38.1 | 505 | 457.2 | 138 | 533.4 | 2 | 577.9 | 1.6 | |
20 | 500 | 700 | 41.3 | 559 | 508 | 143 | 584.2 | 2 | 635 | 1.6 | |
24 | 600 | 815 | 46.1 | 663 | 610 | 151 | 692.2 | 2 | 749.3 | 1.6 |
Class 150 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | Machine Bolt Length | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 1/2 | 50 | 55 | 5/8 | M14 | 0.6 |
3/4 | 20 | 4 | 1/2 | 50 | 65 | 5/8 | M14 | 0.9 |
1 | 25 | 4 | 1/2 | 55 | 65 | 5/8 | M14 | 1.4 |
1 1/4 | 32 | 4 | 1/2 | 55 | 70 | 5/8 | M14 | 1.4 |
1 1/2 | 40 | 4 | 1/2 | 65 | 70 | 5/8 | M14 | 1.8 |
2 | 50 | 4 | 5/8 | 70 | 85 | 3/4 | M16 | 2.7 |
2 1/2 | 65 | 4 | 5/8 | 75 | 90 | 3/4 | M16 | 3.7 |
3 | 80 | 4 | 5/8 | 75 | 90 | 3/4 | M16 | 4.6 |
3 1/2 | 90 | 8 | 5/8 | 75 | 90 | 3/4 | M16 | 5.5 |
4 | 100 | 8 | 5/8 | 75 | 90 | 3/4 | M16 | 6.8 |
5 | 125 | 8 | 3/4 | 85 | 95 | 7/8 | M20 | 8.7 |
6 | 150 | 8 | 3/4 | 85 | 100 | 7/8 | M20 | 10.9 |
8 | 200 | 8 | 3/4 | 90 | 110 | 7/8 | M20 | 17.7 |
10 | 250 | 12 | 7/8 | 100 | 115 | 1 | M24 | 24 |
12 | 300 | 12 | 7/8 | 100 | 120 | 1 | M24 | 37 |
14 | 350 | 12 | 1 | 115 | 135 | 1 1/8 | M27 | 50 |
16 | 400 | 16 | 1 | 115 | 135 | 1 1/8 | M27 | 64 |
18 | 450 | 16 | 1 1/8 | 125 | 145 | 1 1/4 | M30 | 68 |
20 | 500 | 20 | 1 1/8 | 140 | 160 | 1 1/4 | M30 | 82 |
24 | 600 | 20 | 1 1/4 | 150 | 170 | 1 3/8 | M33 | 118 |

Class 300 Weld Neck Flange Dimensions
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 | 12.7 | 38 | 21.3 | 51 | Welding Neck bore is derived from the pipe schedule | 34.9 | 2 | 66.7 | 1.6 |
3/4 | 20 | 115 | 14.3 | 48 | 26.7 | 56 | 42.9 | 2 | 82.6 | 1.6 | |
1 | 25 | 125 | 15.9 | 54 | 33.4 | 60 | 50.8 | 2 | 88.9 | 1.6 | |
1 1/4 | 32 | 135 | 17.5 | 64 | 42.2 | 64 | 63.5 | 2 | 98.4 | 1.6 | |
1 1/2 | 40 | 155 | 19.1 | 70 | 48.3 | 67 | 73 | 2 | 114.3 | 1.6 | |
2 | 50 | 165 | 20.7 | 84 | 60.3 | 68 | 92.1 | 2 | 127 | 1.6 | |
2 1/2 | 65 | 190 | 23.9 | 100 | 73 | 75 | 104.8 | 2 | 149.2 | 1.6 | |
3 | 80 | 210 | 27 | 117 | 88.9 | 78 | 127 | 2 | 168.3 | 1.6 | |
3 1/2 | 90 | 230 | 28.6 | 133 | 101.6 | 79 | 139.7 | 2 | 184.2 | 1.6 | |
4 | 100 | 255 | 30.2 | 146 | 114.3 | 84 | 157.2 | 2 | 200 | 1.6 | |
5 | 125 | 280 | 33.4 | 178 | 141.3 | 97 | 185.7 | 2 | 235 | 1.6 | |
6 | 150 | 320 | 35 | 206 | 168.3 | 97 | 215.9 | 2 | 269.9 | 1.6 | |
8 | 200 | 380 | 39.7 | 260 | 219.1 | 110 | 269.9 | 2 | 330.2 | 1.6 | |
10 | 250 | 445 | 46.1 | 321 | 273 | 116 | 323.8 | 2 | 387.4 | 1.6 | |
12 | 300 | 520 | 49.3 | 375 | 323.8 | 129 | 381 | 2 | 450.8 | 1.6 | |
14 | 350 | 585 | 52.4 | 425 | 355.6 | 141 | 412.8 | 2 | 514.4 | 1.6 | |
16 | 400 | 650 | 55.6 | 483 | 406.4 | 144 | 469.9 | 2 | 571.5 | 1.6 | |
18 | 450 | 710 | 58.8 | 533 | 457 | 157 | 533.4 | 2 | 628.6 | 1.6 | |
20 | 500 | 775 | 62 | 587 | 508 | 160 | 584.2 | 2 | 685.8 | 1.6 | |
24 | 600 | 915 | 68.3 | 702 | 610 | 167 | 692.2 | 2 | 812.8 | 1.6 |
Class 300 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | Machine Bolt Length | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 1/2 | 55 | 65 | 5/8 | M14 | 1.4 |
3/4 | 20 | 4 | 5/8 | 65 | 75 | 3/4 | M16 | 1.4 |
1 | 25 | 4 | 5/8 | 65 | 75 | 3/4 | M16 | 1.8 |
1 1/4 | 32 | 4 | 5/8 | 70 | 85 | 3/4 | M16 | 2.3 |
1 1/2 | 40 | 4 | 3/4 | 75 | 90 | 7/8 | M20 | 3.2 |
2 | 50 | 8 | 5/8 | 75 | 90 | 3/4 | M16 | 4.1 |
2 1/2 | 65 | 8 | 3/4 | 85 | 100 | 7/8 | M20 | 5.5 |
3 | 80 | 8 | 3/4 | 90 | 110 | 7/8 | M20 | 6.8 |
3 1/2 | 90 | 8 | 3/4 | 95 | 110 | 7/8 | M20 | 8.2 |
4 | 100 | 8 | 3/4 | 95 | 115 | 7/8 | M20 | 11.4 |
5 | 125 | 8 | 3/4 | 110 | 120 | 7/8 | M20 | 14.6 |
6 | 150 | 12 | 3/4 | 110 | 120 | 7/8 | M20 | 19.1 |
8 | 200 | 12 | 7/8 | 120 | 140 | 1 | M24 | 31 |
10 | 250 | 16 | 1 | 140 | 160 | 1 1/8 | M27 | 42 |
12 | 300 | 16 | 1 1/8 | 145 | 170 | 1 1/4 | M30 | 64 |
14 | 350 | 20 | 1 1/8 | 160 | 180 | 1 1/4 | M30 | 82 |
16 | 400 | 20 | 1 1/4 | 165 | 190 | 1 3/8 | M33 | 113 |
18 | 450 | 24 | 1 1/4 | 170 | 195 | 1 3/8 | M33 | 145 |
20 | 500 | 24 | 1 1/4 | 185 | 205 | 1 3/8 | M33 | 182 |
24 | 600 | 24 | 1 1/2 | 205 | 230 | 1 5/8 | M39 | 264 |
Class 400 Weld Neck Flange Dimensions
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 | Welding Neck bore is derived from the pipe 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 Dimensions
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 |

Class 600 Weld Neck Flange Dimensions
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 | Welding Neck bore is derived from the pipe 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 | 275 | 38.1 | 152 | 114.3 | 102 | 157.2 | 7 | 215.9 | 1.6 | |
5 | 125 | 330 | 44.5 | 189 | 141.3 | 114 | 185.7 | 7 | 266.7 | 1.6 | |
6 | 150 | 355 | 47.7 | 222 | 168.3 | 117 | 215.9 | 7 | 292.1 | 1.6 | |
8 | 200 | 420 | 55.6 | 273 | 219.1 | 133 | 269.9 | 7 | 349.2 | 1.6 | |
10 | 250 | 510 | 63.5 | 343 | 273 | 152 | 323.8 | 7 | 431.8 | 1.6 | |
12 | 300 | 560 | 66.7 | 400 | 323.8 | 156 | 381 | 7 | 489 | 1.6 | |
14 | 350 | 605 | 69.9 | 432 | 355.6 | 165 | 412.8 | 7 | 527 | 1.6 | |
16 | 400 | 685 | 76.2 | 495 | 406.4 | 178 | 469.9 | 7 | 603.2 | 1.6 | |
18 | 450 | 745 | 82.6 | 546 | 457 | 184 | 533.4 | 7 | 654 | 1.6 | |
20 | 500 | 815 | 88.9 | 610 | 508 | 190 | 584.2 | 7 | 723.9 | 1.6 | |
24 | 600 | 940 | 101.6 | 718 | 610 | 203 | 692.2 | 7 | 838.2 | 1.6 |
Class 600 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 1/2 | 75 | 5/8 | M14 | 1.5 |
3/4 | 20 | 4 | 5/8 | 90 | 3/4 | M16 | 1.8 |
1 | 25 | 4 | 5/8 | 90 | 3/4 | M16 | 1.8 |
1 1/4 | 32 | 4 | 5/8 | 95 | 3/4 | M16 | 2.7 |
1 1/2 | 40 | 4 | 3/4 | 110 | 7/8 | M20 | 3.7 |
2 | 50 | 8 | 5/8 | 110 | 3/4 | M16 | 5.5 |
2 1/2 | 65 | 8 | 3/4 | 120 | 7/8 | M20 | 8.2 |
3 | 80 | 8 | 3/4 | 125 | 7/8 | M20 | 10.5 |
3 1/2 | 90 | 8 | 7/8 | 140 | 1 | M24 | 11.8 |
4 | 100 | 8 | 7/8 | 145 | 1 | M24 | 19.1 |
5 | 125 | 8 | 1 | 165 | 1 1/8 | M27 | 31 |
6 | 150 | 12 | 1 | 170 | 1 1/8 | M27 | 36 |
8 | 200 | 12 | 1 1/8 | 190 | 1 1/4 | M30 | 55 |
10 | 250 | 16 | 1 1/4 | 215 | 1 3/8 | M33 | 86 |
12 | 300 | 20 | 1 1/4 | 220 | 1 3/8 | M33 | 102 |
14 | 350 | 20 | 1 3/8 | 235 | 1 1/2 | M36 | 127 |
16 | 400 | 20 | 1 1/2 | 255 | 1 5/8 | M39 | 177 |
18 | 450 | 20 | 1 5/8 | 275 | 1 3/4 | M42 | 216 |
20 | 500 | 24 | 1 5/8 | 285 | 1 3/4 | M42 | 268 |
24 | 600 | 24 | 1 7/8 | 330 | 2 | M48 | 377 |
Class 900 Weld Neck Flange Dimensions
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 | 120 | 22.3 | 38 | 21.3 | 60 | Welding Neck bore is derived from the pipe schedule | 34.9 | 7 | 82.6 | 1.6 |
3/4 | 20 | 130 | 25.4 | 44 | 26.7 | 70 | 42.9 | 7 | 88.9 | 1.6 | |
1 | 25 | 150 | 28.6 | 52 | 33.4 | 73 | 50.8 | 7 | 101.6 | 1.6 | |
1 1/4 | 32 | 160 | 28.6 | 64 | 42.2 | 73 | 63.5 | 7 | 111.1 | 1.6 | |
1 1/2 | 40 | 180 | 31.8 | 70 | 48.3 | 83 | 73 | 7 | 123.8 | 1.6 | |
2 | 50 | 215 | 38.1 | 105 | 60.3 | 102 | 92.1 | 7 | 165.1 | 1.6 | |
2 1/2 | 65 | 245 | 41.3 | 124 | 73 | 105 | 104.8 | 7 | 190.5 | 1.6 | |
3 | 80 | 240 | 38.1 | 127 | 88.9 | 102 | 127 | 7 | 190.5 | 1.6 | |
4 | 100 | 290 | 44.5 | 159 | 114.3 | 114 | 157.2 | 7 | 235 | 1.6 | |
5 | 125 | 350 | 50.8 | 190 | 141.3 | 127 | 185.7 | 7 | 279.4 | 1.6 | |
6 | 150 | 380 | 55.6 | 235 | 168.3 | 140 | 215.9 | 7 | 317.5 | 1.6 | |
8 | 200 | 470 | 63.5 | 298 | 219.1 | 162 | 269.9 | 7 | 393.7 | 1.6 | |
10 | 250 | 545 | 69.9 | 368 | 273 | 184 | 323.8 | 7 | 469.9 | 1.6 | |
12 | 300 | 610 | 79.4 | 419 | 323.8 | 200 | 381 | 7 | 533.4 | 1.6 | |
14 | 350 | 640 | 85.8 | 451 | 355.6 | 213 | 412.8 | 7 | 558.8 | 1.6 | |
16 | 400 | 705 | 88.9 | 508 | 406.4 | 216 | 469.9 | 7 | 616 | 1.6 | |
18 | 450 | 785 | 101.6 | 565 | 457 | 229 | 533.4 | 7 | 685.8 | 1.6 | |
20 | 500 | 855 | 108 | 622 | 508 | 248 | 584.2 | 7 | 749.3 | 1.6 | |
24 | 600 | 1040 | 139.7 | 749 | 610 | 292 | 692.2 | 7 | 901.7 | 1.6 |
Class 900 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 3/4 | 110 | 7/8 | M20 | 2.3 |
3/4 | 20 | 4 | 3/4 | 115 | 7/8 | M20 | 2.7 |
1 | 25 | 4 | 7/8 | 125 | 1 | M24 | 4.1 |
1 1/4 | 32 | 4 | 7/8 | 125 | 1 | M24 | 4.6 |
1 1/2 | 40 | 4 | 1 | 140 | 1 1/8 | M27 | 5.9 |
2 | 50 | 8 | 7/8 | 145 | 1 | M24 | 11.5 |
2 1/2 | 65 | 8 | 1 | 160 | 1 1/8 | M27 | 16.5 |
3 | 80 | 8 | 7/8 | 145 | 1 | M24 | 14 |
4 | 100 | 8 | 1 1/8 | 170 | 1 1/4 | M30 | 23 |
5 | 125 | 8 | 1 1/4 | 190 | 1 3/8 | M33 | 39.5 |
6 | 150 | 12 | 1 1/8 | 190 | 1 1/4 | M30 | 50 |
8 | 200 | 12 | 1 3/8 | 220 | 1 1/2 | M36 | 80 |
10 | 250 | 16 | 1 3/8 | 235 | 1 1/2 | M36 | 118 |
12 | 300 | 20 | 1 3/8 | 255 | 1 1/2 | M36 | 148 |
14 | 350 | 20 | 1 1/2 | 275 | 1 5/8 | M39 | 182 |
16 | 400 | 20 | 1 5/8 | 285 | 1 3/4 | M42 | 225 |
18 | 450 | 20 | 1 7/8 | 325 | 2 | M48 | 300 |
20 | 500 | 20 | 2 | 350 | 2 1/8 | M52 | 373 |
24 | 600 | 20 | 2 1/2 | 440 | 2 5/8 | M64 | 680 |
Class 1500 Weld Neck Flange Dimensions
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 | 120 | 22.3 | 38 | 21.3 | 60 | Welding Neck bore is derived from the pipe schedule | 34.9 | 7 | 82.6 | 1.6 |
3/4 | 20 | 130 | 25.4 | 44 | 26.7 | 70 | 42.9 | 7 | 88.9 | 1.6 | |
1 | 25 | 150 | 28.6 | 52 | 33.4 | 73 | 50.8 | 7 | 101.6 | 1.6 | |
1 1/4 | 32 | 160 | 28.6 | 64 | 42.2 | 73 | 63.5 | 7 | 111.1 | 1.6 | |
1 1/2 | 40 | 180 | 31.8 | 70 | 48.3 | 83 | 73 | 7 | 123.8 | 1.6 | |
2 | 50 | 215 | 38.1 | 105 | 60.3 | 102 | 92.1 | 7 | 165.1 | 1.6 | |
2 1/2 | 65 | 245 | 41.3 | 124 | 73 | 105 | 104.8 | 7 | 190.5 | 1.6 | |
3 | 80 | 265 | 47.7 | 133 | 88.9 | 117 | 127 | 7 | 203.2 | 1.6 | |
4 | 100 | 310 | 54 | 162 | 114.3 | 124 | 157.2 | 7 | 241.3 | 1.6 | |
5 | 125 | 375 | 73.1 | 197 | 141.3 | 156 | 185.7 | 7 | 292.1 | 1.6 | |
6 | 150 | 395 | 82.6 | 229 | 168.3 | 171 | 215.9 | 7 | 317.5 | 1.6 | |
8 | 200 | 485 | 92.1 | 292 | 219.1 | 213 | 269.9 | 7 | 393.7 | 1.6 | |
10 | 250 | 585 | 108 | 368 | 273 | 254 | 323.8 | 7 | 482.6 | 1.6 | |
12 | 300 | 675 | 123.9 | 451 | 323.8 | 283 | 381 | 7 | 571.5 | 1.6 | |
14 | 350 | 750 | 133.4 | 495 | 355.6 | 298 | 412.8 | 7 | 635 | 1.6 | |
16 | 400 | 825 | 146.1 | 552 | 406.4 | 311 | 469.9 | 7 | 704.8 | 1.6 | |
18 | 450 | 915 | 162 | 597 | 457 | 327 | 533.4 | 7 | 774.7 | 1.6 | |
20 | 500 | 985 | 177.8 | 641 | 508 | 356 | 584.2 | 7 | 831.8 | 1.6 | |
24 | 600 | 1170 | 203.2 | 762 | 610 | 406 | 692.2 | 7 | 990.6 | 1.6 |
Class 1500 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 3/4 | 110 | 7/8 | M20 | 2.3 |
3/4 | 20 | 4 | 3/4 | 115 | 7/8 | M20 | 2.7 |
1 | 25 | 4 | 7/8 | 125 | 1 | M24 | 4.1 |
1 1/4 | 32 | 4 | 7/8 | 125 | 1 | M24 | 4.6 |
1 1/2 | 40 | 4 | 1 | 140 | 1 1/8 | M27 | 5.9 |
2 | 50 | 8 | 7/8 | 145 | 1 | M24 | 11.4 |
2 1/2 | 65 | 8 | 1 | 160 | 1 1/8 | M27 | 16.4 |
3 | 80 | 8 | 1 1/8 | 180 | 1 1/4 | M30 | 21.8 |
4 | 100 | 8 | 1 1/4 | 195 | 1 3/8 | M33 | 33 |
5 | 125 | 8 | 1 1/2 | 250 | 1 5/8 | M39 | 59 |
6 | 150 | 12 | 1 3/8 | 260 | 1 1/2 | M36 | 75 |
8 | 200 | 12 | 1 5/8 | 290 | 1 3/4 | M42 | 125 |
10 | 250 | 12 | 1 7/8 | 335 | 2 | M48 | 207 |
12 | 300 | 16 | 2 | 375 | 2 1/8 | M52 | 314 |
14 | 350 | 16 | 2 1/4 | 405 | 2 3/8 | M56 | 427 |
16 | 400 | 16 | 2 1/2 | 445 | 2 5/8 | M64 | 568 |
18 | 450 | 16 | 2 3/4 | 495 | 2 7/8 | M72 | 738 |
20 | 500 | 16 | 3 | 540 | 3 1/8 | M76 | 932 |
24 | 600 | 16 | 3 1/2 | 615 | 3 5/8 | M90 | 1511 |
Class 2500 Weld Neck Flange Dimensions
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 | 135 | 30.2 | 43 | 21.3 | 73 | Welding Neck bore is derived from the pipe schedule | 34.9 | 7 | 88.9 | 1.6 |
3/4 | 20 | 140 | 31.8 | 51 | 26.7 | 79 | 42.9 | 7 | 95.2 | 1.6 | |
1 | 25 | 160 | 35 | 57 | 33.4 | 89 | 50.8 | 7 | 108 | 1.6 | |
1 1/4 | 32 | 185 | 38.1 | 73 | 42.2 | 95 | 63.5 | 7 | 130.2 | 1.6 | |
1 1/2 | 40 | 205 | 44.5 | 79 | 48.3 | 111 | 73 | 7 | 146 | 1.6 | |
2 | 50 | 235 | 50.9 | 95 | 60.3 | 127 | 92.1 | 7 | 171.4 | 1.6 | |
2 1/2 | 65 | 265 | 57.2 | 114 | 73 | 143 | 104.8 | 7 | 196.8 | 1.6 | |
3 | 80 | 305 | 66.7 | 133 | 88.9 | 168 | 127 | 7 | 228.6 | 1.6 | |
4 | 100 | 355 | 76.2 | 165 | 114.3 | 190 | 157.2 | 7 | 273 | 1.6 | |
5 | 125 | 420 | 92.1 | 203 | 141.3 | 229 | 185.7 | 7 | 323.8 | 1.6 | |
6 | 150 | 485 | 108 | 235 | 168.3 | 273 | 215.9 | 7 | 368.3 | 1.6 | |
8 | 200 | 550 | 127 | 305 | 219.1 | 318 | 269.9 | 7 | 438.2 | 1.6 | |
10 | 250 | 675 | 165.1 | 375 | 273 | 419 | 323.8 | 7 | 539.8 | 1.6 | |
12 | 300 | 760 | 184.2 | 441 | 323.8 | 464 | 381 | 7 | 619.1 | 1.6 |
Class 2500 Weld Neck Flange Stud & Bolt Dimensions
Size in Inch | Size in mm | No of Bolts | Bolt Size UNC | RF Stud Length | Hole Size | ISO Stud Size | Weight in kg |
---|---|---|---|---|---|---|---|
1/2 | 15 | 4 | 3/4 | 120 | 7/8 | M20 | 3.3 |
3/4 | 20 | 4 | 3/4 | 125 | 7/8 | M20 | 3.7 |
1 | 25 | 4 | 7/8 | 140 | 1 | M24 | 5.5 |
1 1/4 | 32 | 4 | 1 | 150 | 1 1/8 | M27 | 7.8 |
1 1/2 | 40 | 4 | 1 1/8 | 170 | 1 1/4 | M30 | 11.5 |
2 | 50 | 8 | 1 | 180 | 1 1/8 | M27 | 19 |
2 1/2 | 65 | 8 | 1 1/8 | 195 | 1 1/4 | M30 | 24 |
3 | 80 | 8 | 1 1/4 | 220 | 1 3/8 | M33 | 42.8 |
4 | 100 | 8 | 1 1/2 | 255 | 1 5/8 | M39 | 66 |
5 | 125 | 8 | 1 3/4 | 300 | 1 7/8 | M45 | 111 |
6 | 150 | 8 | 2 | 345 | 2 1/8 | M52 | 173 |
8 | 200 | 12 | 2 | 380 | 2 1/8 | M52 | 264 |
10 | 250 | 12 | 2 1/2 | 490 | 2 5/8 | M64 | 490 |
12 | 300 | 12 | 2 3/4 | 540 | 2 7/8 | M72 | 695 |
Disclaimer – Please check with ASME B16.5 Before using.