Weldneck Flanges
UNS S30400 Weldneck Flanges, DIN 1.4301 Weldneck Flanges, UNS N08904 Weldneck Flanges, ASME SA182 Duplex 2205 Weldneck Flanges, ASME SA182 SS 316 Weldneck Flanges.

About Weldneck Flanges
NISSAN STEEL Manufacturer supplier of SS, High nickel and Duplex / Super duplex Flanges, for enquiry contact on email: sales@nissansteel.com, export@nissansteel.com, nissansteels@gmail.com
304 Stainless Steel Weldneck Flanges Stockist, Inconel 625 Weldneck Flanges Exporter, Duplex 31803 Weldneck Flanges Stockist, UNS N06625 Weldneck Flanges Exporter.
Specification of Weldneck Flanges
Standards | ANSI/ASME B16.5, B16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, GOST Flange, ASME/ANSI B16.5/16.36/16.47A/16.47B, MSS S44, ISO70051, JISB2220, BS1560-3.1, API7S-15, API7S-43, API605, EN1092 |
Size Chart | 1/2" (15 NB) to 48" (1200NB) DN10~DN5000 |
Pressure Calculation in DIN | 6Bar 10Bar 16Bar 25Bar 40Bar / PN6 PN10 PN16 PN25 PN40, PN64 Weld Neck Flanges |
Pressure Rating ANSI | Class 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS Weld Neck Flanges |
UNI | 6Bar 10Bar 16Bar 25Bar 40Bar Weld Neck Flanges |
JIS | 5K, 10 K, 16 K 20 K, 30 K, 40 K, 63 K Weld Neck Flanges |
Coating | Oil Black Paint, Anti-rust Paint, Zinc Plated, Yellow Transparent, Cold and Hot Dip Galvanized Weld Neck Flanges |
EN | 6Bar 10Bar 16Bar 25Bar 40Bar Weld Neck Flanges |
Most common types of Weld Neck Flanges | Forged / Threaded / Screwed / Plate |
Connect Type/ Flange Face Type | Raised Face (RF), Ring Type Joint (RTJ), Flat Face (FF), Large Male-Female (LMF), Lap-Joint Face (LJF), Small Male-Female (SMF), Small Tongue, Large Tongue & Groove, Groove |
Dimensions Standard Of Weldneck Flanges

Class 150 Weld Neck Flange Dimensions
Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Diameter of Raised Face | Hub Diam. Chamfer of W.N | Lengtd Hub.Y | Bore | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | Approx. Weight | ||
inch | dn | O | C | X | G | A | Y | B | BC | BH | BN | BD | KG | LB |
1/2″ | 15 | 89.00 | 11.20 | 30.20 | 35.10 | 21.30 | 47.80 | 15.80 | 60.50 | 15.80 | 4 | 1/2″ | 0.7 | 1.5 |
3/4″ | 20 | 98.50 | 12.70 | 38.10 | 42.90 | 26.70 | 52.30 | 20.80 | 69.90 | 15.80 | 4 | 1/2″ | 0.8 | 1.8 |
1″ | 25 | 108.00 | 14.20 | 49.30 | 50.80 | 33.50 | 55.60 | 26.70 | 79.30 | 15.80 | 4 | 1/2″ | 1.1 | 2.4 |
1-1/4″ | 32 | 117.50 | 15.70 | 58.70 | 63.50 | 42.20 | 57.20 | 35.10 | 88.90 | 15.80 | 4 | 1/2″ | 1.5 | 3.3 |
1-1/2″ | 40 | 127.00 | 17.50 | 65.00 | 73.20 | 48.30 | 62.00 | 40.90 | 98.60 | 15.80 | 4 | 1/2″ | 1.8 | 4 |
2″ | 50 | 152.50 | 19.10 | 77.70 | 91.90 | 60.50 | 63.50 | 52.60 | 120.70 | 19.10 | 4 | 5/8″ | 2.7 | 6 |
2-1/2″ | 65 | 178.00 | 22.40 | 90.40 | 104.60 | 73.20 | 69.90 | 62.70 | 139.70 | 19.10 | 4 | 5/8″ | 4.4 | 9.8 |
3″ | 80 | 190.50 | 23.90 | 108.00 | 127.00 | 88.90 | 69.90 | 78.00 | 152.40 | 19.10 | 4 | 5/8″ | 5.2 | 11.5 |
3-1/2″ | 90 | 216.00 | 23.90 | 122.20 | 139.70 | 101.60 | 71.40 | 90.20 | 177.80 | 19.10 | 8 | 5/8″ | 6.4 | 14.2 |
4″ | 100 | 228.50 | 23.90 | 134.90 | 157.20 | 114.30 | 76.20 | 102.40 | 190.50 | 19.10 | 8 | 5/8″ | 7.5 | 16.6 |
5″ | 125 | 254.00 | 23.90 | 163.60 | 185.70 | 141.20 | 88.90 | 128.30 | 215.90 | 22.40 | 8 | 3/4″ | 9.2 | 20.2 |
6″ | 150 | 279.50 | 25.40 | 192.00 | 215.90 | 168.40 | 88.90 | 154.20 | 241.30 | 22.40 | 8 | 3/4″ | 11 | 24.3 |
8″ | 200 | 343.00 | 28.40 | 246.10 | 269.70 | 219.20 | 101.60 | 202.70 | 298.50 | 22.40 | 8 | 3/4″ | 18.4 | 40.6 |
10″ | 250 | 406.50 | 30.20 | 304.80 | 323.90 | 273.10 | 101.60 | 254.50 | 362.00 | 25.40 | 12 | 7/8″ | 25.5 | 56.2 |
12″ | 300 | 482.50 | 31.80 | 365.30 | 381.00 | 323.90 | 114.30 | 304.80 | 431.80 | 25.40 | 12 | 7/8″ | 37 | 81.4 |
14″ | 350 | 533.50 | 35.10 | 400.10 | 412.80 | 355.60 | 127.00 | 476.30 | 28.50 | 12 | 1″ | 51 | 113 | |
16″ | 400 | 597.00 | 36.60 | 457.20 | 469.90 | 406.40 | 127.00 | 539.80 | 28.50 | 16 | 1″ | 61.5 | 136 | |
18″ | 450 | 635.00 | 39.60 | 505.00 | 533.40 | 457.20 | 139.70 | 577.90 | 31.80 | 16 | 1 1/8″ | 71.5 | 158 | |
20″ | 500 | 698.50 | 42.90 | 558.80 | 584.20 | 508.00 | 144.50 | 635.00 | 31.80 | 20 | 1 1/8″ | 85 | 187 | |
24″ | 600 | 813.00 | 47.80 | 663.40 | 692.20 | 609.60 | 152.40 | 749.30 | 35.10 | 20 | 1 1/4″ | 119 | 262 |
Class 300 Weld Neck Flange Dimensions
Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Diameter of Raised Face | Hub Diam. Chamfer of W.N | Lengtd Hub.Y | Bore | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | Approx. Weight | ||
inch | dn | O | C | X | G | A | Y | B | BC | BH | BN | BD | KG/PCS | LB/PCS |
1/2″ | 15 | 95.5 | 14.2 | 38.1 | 35.1 | 21.3 | 52.3 | 15.7 | 66.5 | 15.7 | 4 | 1/2″ | 0.8 | 1.8 |
3/4″ | 20 | 117. 5 | 15.7 | 47.8 | 42.9 | 26.7 | 57.2 | 20.8 | 82.6 | 19.1 | 4 | 5/8″ | 1.4 | 3.1 |
1″ | 25 | 124. 0 | 17.5 | 53.8 | 50.8 | 33.5 | 62 | 26.7 | 88.9 | 19.1 | 4 | 5/8″ | 1.7 | 3.7 |
1-1/4″ | 32 | 133. 5 | 19.1 | 63.5 | 63.5 | 42.2 | 65 | 35.1 | 98.6 | 19.1 | 4 | 5/8″ | 2.2 | 4.8 |
1-1/2″ | 40 | 155. 5 | 20.6 | 69.9 | 73.2 | 48.3 | 68.3 | 40.9 | 114.3 | 22.4 | 4 | 5/8″ | 3.2 | 7 |
2″ | 50 | 165. 0 | 22.4 | 84.1 | 91.9 | 60.5 | 69.9 | 52.6 | 127 | 19.1 | 8 | 5/8″ | 3.6 | 7.9 |
2-1/2″ | 65 | 190. 5 | 25.4 | 100.1 | 104.6 | 73.2 | 76.2 | 62.7 | 149.4 | 22.4 | 8 | 3/4″ | 5.4 | 12 |
3″ | 80 | 209. 5 | 28.4 | 117.3 | 127 | 88.9 | 79.2 | 78 | 168.1 | 22.4 | 8 | 3/4″ | 7.3 | 16.1 |
3-1/2″ | 90 | 228. 5 | 30.2 | 133.4 | 139.7 | 101.6 | 81 | 90.2 | 184.2 | 22.4 | 8 | 3/4″ | 8.9 | 19.6 |
4″ | 100 | 254. 0 | 31.8 | 146.1 | 157.2 | 114.3 | 85.9 | 102.4 | 200.2 | 22.4 | 8 | 3/4″ | 11.8 | 26 |
5″ | 125 | 279. 5 | 35.1 | 177.8 | 185.7 | 141.2 | 98.6 | 128.3 | 235 | 22.4 | 8 | 3/4″ | 16 | 35.2 |
6″ | 150 | 317. 5 | 36.6 | 206.2 | 215.9 | 168.4 | 98.6 | 154.2 | 269.7 | 22.4 | 12 | 3/4″ | 20.2 | 44.6 |
8″ | 200 | 381. 0 | 41.1 | 260.4 | 269.7 | 219.2 | 111. 3 | 202.7 | 330.2 | 25.4 | 12 | 7/8″ | 31.2 | 68.8 |
10″ | 250 | 444. 5 | 47.8 | 320.5 | 323.9 | 273.1 | 117. 3 | 254.5 | 387.4 | 28.4 | 16 | 1″ | 44.3 | 97.5 |
12″ | 300 | 520. 5 | 50.8 | 374.7 | 381 | 323.9 | 130. 0 | 304.8 | 450.9 | 31.8 | 16 | 1 1/8″ | 63.5 | 140 |
14″ | 350 | 584. 0 | 53.8 | 425.5 | 412.8 | 355.6 | 142. 7 | 514..4 | 31.8 | 20 | 1 1/8″ | 86 | 190 | |
16″ | 400 | 647. 5 | 57.2 | 482.6 | 469.9 | 406.4 | 146. 1 | 571.5 | 35.1 | 20 | 1 1/4″ | 112 | 247 | |
18″ | 450 | 711. 0 | 60.5 | 533.4 | 533.4 | 457.2 | 158. 8 | 628.7 | 35.1 | 24 | 1 1/4″ | 141 | 310 | |
20″ | 500 | 774. 5 | 63.5 | 587.2 | 584.2 | 508 | 162. 1 | 685.8 | 35.1 | 24 | 1 1/4″ | 173 | 382 | |
24″ | 600 | 914. 5 | 69.9 | 701.5 | 692.2 | 609.6 | 168. 1 | 812.8 | 41.1 | 24 | 1 1/2″ | 248 | 546 |
Class 600 Weld Neck Flange Dimensions
Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Diameter of Raised Face | Hub Diam. Chamfer of W.N | Lengtd Hub | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | Approx. Weight | ||
inch | dn | O | C | X | G | A | Y | BC | BH | BN | BD | KG/PCS | LB/PCS |
1/2″ | 15 | 95.5 | 14.2 | 38.1 | 35.1 | 22.4 | 52.3 | 66.5 | 15.7 | 4 | 1/2″ | 0.9 | 2 |
3/4″ | 20 | 117. 5 | 15.7 | 47.8 | 42.9 | 25.4 | 57.2 | 82.6 | 19.1 | 4 | 5/8″ | 1.6 | 3.5 |
1″ | 25 | 124. 0 | 17.5 | 53.8 | 50.8 | 26.9 | 62 | 88.9 | 19.1 | 4 | 5/8″ | 1.9 | 4.2 |
1-1/4″ | 32 | 133. 5 | 20.6 | 63.5 | 63.5 | 28.4 | 66.5 | 98.6 | 19.1 | 4 | 5/8″ | 2.6 | 5.8 |
1-1/2″ | 40 | 155. 5 | 22.4 | 69.9 | 73.2 | 31.8 | 69.9 | 114.3 | 22.4 | 4 | 3/4″ | 3.6 | 8 |
2″ | 50 | 165. 0 | 25.4 | 84.1 | 91.9 | 36.6 | 73.2 | 127 | 19.1 | 8 | 5/8″ | 4.7 | 10.4 |
2-1/2″ | 65 | 190. 5 | 28.4 | 100.1 | 104.6 | 41.1 | 79.2 | 149.4 | 22.4 | 8 | 3/4″ | 4.8 | 15 |
3″ | 80 | 209. 5 | 31.8 | 117.3 | 127 | 46 | 82.6 | 168.1 | 22.4 | 8 | 3/4″ | 8.7 | 19.3 |
3-1/2″ | 90 | 228. 5 | 35.1 | 133.4 | 139.7 | 49.3 | 85.9 | 184.2 | 25.4 | 8 | 7/8″ | 11.6 | 25.5 |
4″ | 100 | 273. 0 | 38.1 | 152.4 | 157.2 | 53.8 | 101. 6 | 215.9 | 25.4 | 8 | 7/8″ | 18.4 | 40.5 |
5″ | 125 | 330. 0 | 44.5 | 189 | 185.7 | 60.5 | 114. 3 | 266.7 | 28.4 | 8 | 1″ | 31 | 68 |
6″ | 150 | 355. 5 | 47.8 | 222.3 | 215.9 | 66.5 | 117. 3 | 292.1 | 28.4 | 12 | 1″ | 37 | 81.4 |
8″ | 200 | 419. 0 | 55.6 | 273.1 | 269.7 | 76.2 | 133. 4 | 349.3 | 31.8 | 12 | 1 1/8″ | 54.5 | 120 |
10″ | 250 | 508. 0 | 63.5 | 342.9 | 323.9 | 85.9 | 152. 4 | 431.8 | 35.1 | 16 | 1 1/4″ | 98.5 | 195 |
12″ | 300 | 559. 0 | 66.5 | 400.1 | 381 | 91.9 | 155. 4 | 489 | 35.1 | 20 | 1 1/4″ | 105 | 231 |
14″ | 350 | 603. 5 | 69.9 | 431.8 | 412.8 | 93.7 | 165. 1 | 527.1 | 38.1 | 20 | 1 3/8″ | 150 | 330 |
16″ | 400 | 686. 0 | 76.2 | 495.3 | 469.9 | 106.4 | 177. 8 | 603.3 | 41.1 | 20 | 1 1/2″ | 177 | 390 |
18″ | 450 | 743. 0 | 82.6 | 546.1 | 533.4 | 117.3 | 184. 2 | 654.1 | 44.5 | 20 | 1 5/8″ | 228 | 503 |
20″ | 500 | 813. 0 | 88.9 | 609.6 | 584.2 | 127 | 190. 5 | 723.9 | 44.5 | 24 | 1 5/8″ | 285 | 628 |
24″ | 600 | 940. 0 | 101.6 | 717.6 | 692.2 | 139.7 | 203. 2 | 838.2 | 50.8 | 24 | 1 7/8″ | 372 | 820 |
Class 1500 Weld Neck Flanges Dimensions
Pipe Normal Diam. | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Hub Diam. Chamfer of W.N | Length Hub | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | Approx. Weight | ||
inch | dn | O | C | X | A | Y | BC | BH | BN | BD | KG/PCS | LB/PCS |
1/2″ | 15 | 120.7 | 22.4 | 38.1 | 21.3 | 60.5 | 82.6 | 22.4 | 4 | 3/4″ | 2.1 | 4.6 |
3/4″ | 20 | 130 | 25.4 | 44.5 | 26.7 | 69.9 | 88.9 | 22.4 | 4 | 3/4″ | 2.7 | 5.9 |
1″ | 25 | 149.4 | 28.4 | 52.3 | 33.5 | 73.2 | 101.6 | 25.4 | 4 | 7/8″ | 3.9 | 8.6 |
1-1/4″ | 32 | 158.8 | 28.4 | 63.5 | 42.2 | 73.2 | 111.3 | 25.4 | 4 | 7/8″ | 4.5 | 9.9 |
1-1/2″ | 40 | 177.8 | 31.8 | 69.9 | 48.3 | 82.6 | 124 | 28.4 | 4 | 1″ | 6.2 | 13.7 |
2″ | 50 | 215.9 | 38.1 | 104.6 | 60.5 | 101.6 | 165.1 | 25.4 | 8 | 7/8″ | 11.3 | 24.9 |
2-1/2″ | 65 | 244.3 | 41.1 | 124 | 73.2 | 104.6 | 190.5 | 28.4 | 8 | 1″ | 16.3 | 36 |
3″ | 80 | 266.7 | 47.8 | 133.4 | 88.9 | 117.3 | 190.5 | 25.4 | 8 | 7/8″ | 21 | 46.3 |
4″ | 100 | 311.2 | 53.8 | 162.1 | 114.3 | 124 | 235 | 31.8 | 8 | 1 1/8″ | 31.8 | 70.1 |
5″ | 125 | 374.7 | 73.2 | 196.9 | 141.2 | 155.4 | 279.4 | 35.1 | 8 | 1 1/4″ | 59 | 129.8 |
6″ | 150 | 393.7 | 82.6 | 228.6 | 168.4 | 171.5 | 317.5 | 31.8 | 12 | 1 1/8″ | 72 | 158 |
8″ | 200 | 482.6 | 91.9 | 292.1 | 219.2 | 212.9 | 393.7 | 38.1 | 12 | 1 3/8″ | 124 | 273 |
10″ | 250 | 584.2 | 108 | 368.3 | 273.1 | 254 | 469.9 | 38.1 | 16 | 1 3/8″ | 207 | 456 |
12″ | 300 | 673.1 | 124 | 450.9 | 323.9 | 282.4 | 533.4 | 38.1 | 20 | 1 3/8″ | 306 | 674 |
14″ | 350 | 749.3 | 133.4 | 495.3 | 355.6 | 298.5 | 558.8 | 41.1 | 20 | 1 1/2″ | 416 | 917 |
16″ | 400 | 825.5 | 146.1 | 552.5 | 406.4 | 311.2 | 616 | 44.5 | 20 | 1 5/8″ | 567 | 1250 |
18″ | 450 | 914.4 | 162.1 | 596.9 | 457.2 | 327.2 | 685.8 | 50.8 | 20 | 1 7/8″ | 736 | 1623 |
20″ | 500 | 984.3 | 177.8 | 641.4 | 508 | 355.6 | 749.3 | 53.8 | 20 | 2″ | 929 | 2048 |
24″ | 600 | 1168.4 | 203.2 | 762 | 609.6 | 406.4 | 901.7 | 66.5 | 20 | 2 1/2″ | 1504 | 3316 |
Class 2500 Weld Neck Flanges Dimensions
Nominal Pipe Size | O.D. Flange | Thk. Of Flange Min | Diam. of Hub | Hub Diam. Chamfer of W.N | Lengtd Hub.Y | Diam. of Bolt Circle | Diam. of Bolt Holes | Number of Bolts | Diam. of Bolts (inch) | Approx. Weight | ||
inch | dn | O | C | X | A | Y | BC | BH | BN | BD | KG | LB |
1/2″ | 15 | 133.4 | 30.2 | 42.9 | 21.3 | 73.2 | 88.9 | 22.4 | 4 | 3/4″ | 3.2 | 7 |
3/4″ | 20 | 139.7 | 31.8 | 50.8 | 26.7 | 79.2 | 95.3 | 22.4 | 4 | 3/4″ | 3.6 | 8 |
1″ | 25 | 158.8 | 35.1 | 57.2 | 33.5 | 88.9 | 108 | 25.4 | 4 | 7/8″ | 5.4 | 12 |
1-1/4″ | 32 | 184.2 | 38.1 | 73.2 | 42.2 | 95.3 | 130 | 28.4 | 4 | 1″ | 7.8 | 17.2 |
1-1/2″ | 40 | 203.2 | 44.5 | 79.2 | 48.3 | 111.3 | 146.1 | 31.8 | 4 | 1 1/8″ | 11.5 | 25.4 |
2″ | 50 | 235 | 50.8 | 95.3 | 60.5 | 127 | 171.5 | 28.4 | 8 | 1″ | 19 | 42 |
2-1/2″ | 65 | 266.7 | 57.2 | 114.3 | 73.2 | 142.7 | 196.9 | 31.8 | 8 | 1 1/8″ | 24 | 52 |
3″ | 80 | 304.8 | 66.5 | 133.4 | 88.9 | 168.1 | 228.6 | 35.1 | 8 | 1 1/4″ | 42.6 | 94 |
4″ | 100 | 355.6 | 76.2 | 165.1 | 114.3 | 190.5 | 273.1 | 41.1 | 8 | 1 1/2″ | 64 | 141 |
5″ | 125 | 419.1 | 91.9 | 203.2 | 141.2 | 228.6 | 323.9 | 47.8 | 8 | 1 3/4″ | 111 | 244 |
6″ | 150 | 482.6 | 108 | 235 | 168.4 | 273.1 | 368.3 | 53.8 | 8 | 2″ | 171 | 378 |
8″ | 200 | 552.5 | 127 | 304.8 | 219.2 | 317.5 | 438.2 | 53.8 | 12 | 2″ | 261 | 576 |
10″ | 250 | 673.1 | 165.1 | 374.7 | 273.1 | 419.1 | 539.8 | 66.5 | 12 | 2 1/2″ | 485 | 1068 |
12″ | 300 | 762 | 184.2 | 441.5 | 323.9 | 463.6 | 619.3 | 73.2 | 12 | 2 3/4″ | 698 | 1539 |
Size Of Weldneck Flanges
Nom Pipe Size | Outside Diam | Sched 10 | Sched 20 | Sched 30 | Std. Wall | Sched 40 | Sched 60 | Extra Strong | Sched 80 | Sched 100 | Sched 120 | Sched 140 | Sched 160 | Double Extra Strong |
1/2” | 0.840 | 0.674 | – | – | 0.622 | 0.622 | – | 0.546 | 0.546 | – | – | – | 0.464 | 0.252 |
3/4” | 1.050 | 0.884 | – | – | 0.824 | 0.824 | – | 0.742 | 0.742 | – | – | – | 0.612 | 0.434 |
1” | 1.315 | 1.097 | – | – | 1.049 | 1.049 | – | 0.957 | 0.957 | – | – | – | 0.815 | 0.599 |
1.1/4” | 1.660 | 1.442 | – | – | 1.380 | 1.380 | – | 1.278 | 1.278 | – | – | – | 1.160 | 0.896 |
1.1/2” | 1.900 | 1.682 | – | – | 1.610 | 1.610 | – | 1.500 | 1.500 | – | – | – | 1.338 | 1.100 |
2” | 2.375 | 2.157 | – | – | 2.067 | 2.067 | – | 1.939 | 1.939 | – | – | – | 1.687 | 1.503 |
2.1/2” | 2.875 | 2.635 | – | – | 2.469 | 2.469 | – | 2.323 | 2.323 | – | – | – | 2.125 | 1.771 |
3” | 3.500 | 3.260 | – | – | 3.068 | 3.068 | – | 2.900 | 2.900 | – | – | – | 2.624 | 2.300 |
3-1/2” | 4.000 | 3.760 | – | – | 3.548 | 3.548 | – | 3.364 | 3.364 | – | – | – | – | 2.728 |
4” | 4.500 | 4.260 | – | – | 4.026 | 4.026 | – | 3.826 | 3.826 | – | 3.624 | – | 3.438 | 3.152 |
5” | 5.563 | 5.295 | – | – | 5.047 | 5.047 | – | 4.813 | 4.813 | – | 4.563 | – | 4.313 | 4.063 |
6” | 6.625 | 6.357 | – | – | 6.065 | 6.065 | – | 5.761 | 5.761 | – | 5.501 | – | 5.187 | 4.897 |
8” | 8.625 | 8.329 | 8.125 | 8.071 | 7.981 | 7.981 | 7.813 | 7.625 | 7.625 | 7.437 | 7.187 | 7.001 | 6.813 | 6.875 |
10” | 10.750 | 10.420 | 10.250 | 10.136 | 10.020 | 10.020 | 9.750 | 9.750 | 9.562 | 9.312 | 9.062 | 8.750 | 8.500 | 8.750 |
12” | 12.750 | 12.390 | 12.250 | 12.090 | 12.000 | 11.938 | 11.626 | 11.750 | 11.374 | 11.062 | 10.750 | 10.500 | 10.126 | 10.750 |
14” | 14.000 | 13.500 | 13.376 | 13.250 | 13.250 | 13.124 | 12.812 | 13.000 | 12.500 | 12.124 | 11.814 | 11.500 | 11.188 | – |
16” | 16.000 | 15.500 | 15.376 | 15.250 | 15.250 | 15.000 | 14.688 | 15.000 | 14.312 | 13.938 | 13.564 | 13.124 | 12.812 | – |
18” | 18.000 | 17.500 | 17.376 | 17.124 | 17.250 | 16.876 | 16.500 | 17.000 | 16.124 | 15.688 | 15.250 | 14.876 | 14.438 | – |
20” | 20.000 | 19.500 | 19.250 | 19.000 | 19.250 | 18.812 | 18.376 | 19.000 | 17.938 | 17.438 | 17.000 | 16.500 | 16.062 | – |
24” | 24.000 | 23.500 | 23.250 | 22.876 | 23.250 | 22.624 | 22.062 | 23.000 | 21.562 | 20.938 | 20.376 | 19.876 | 19.312 | – |
30” | 30.000 | 29.376 | 29.000 | 28.750 | 29.250 | – | – | 29.000 | – | – | – | – | – | – |
36” | 36.000 | 35.376 | 35.000 | 34.750 | 35.250 | 34.500 | – | 35.000 | – | – | – | – | – | – |
42” | 42.000 | – | – | – | 41.250 | – | – | 41.000 | – | – | – | – | – | – |
Weight Chart Of Weldneck Flanges
Nom Size | 150# | 300# | 600# | 900# | 1500# | 2500# | ||||||||||||
WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | WN | S/O | B/K | |
1/2” | 0.7 | 0.4 | 0.5 | 0.8 | 0.7 | 0.8 | 0.9 | 0.8 | 0.8 | 2.1 | 1.8 | 1.9 | 2.1 | 1.8 | 1.9 | 3.2 | 3 | 3 |
3/4” | 0.8 | 0.7 | 0.8 | 1.4 | 1.2 | 1.2 | 1.6 | 1.4 | 1.4 | 2.7 | 2.4 | 2.7 | 2.7 | 2.4 | 2.7 | 3.6 | 4 | 4.5 |
1” | 1.1 | 0.8 | 0.9 | 1.7 | 1.4 | 1.5 | 1.9 | 1.7 | 1.7 | 3.9 | 3.6 | 3.7 | 3.9 | 3.6 | 3.7 | 5.4 | 5 | 5 |
1.1/4” | 1.5 | 1.2 | 1.3 | 2.2 | 1.8 | 2 | 2.6 | 2.1 | 2.4 | 4.5 | 4.1 | 4.3 | 4.5 | 4.1 | 4.3 | 7.8 | 8 | 8 |
1.1/2” | 1.8 | 1.4 | 1.6 | 3.2 | 2.7 | 2.9 | 3.6 | 3.1 | 3.4 | 6.2 | 5.4 | 5.9 | 6.2 | 5.4 | 5.9 | 11.5 | 11 | 11 |
2” | 2.7 | 2.2 | 2.6 | 3.6 | 3.2 | 3.5 | 4.7 | 3.9 | 4.4 | 11.3 | 10.5 | 11.3 | 11.3 | 10.5 | 11.3 | 19 | 17 | 17 |
2.1/2” | 4.4 | 3.5 | 4.1 | 5.4 | 4.5 | 5.3 | 4.8 | 5.4 | 6.8 | 16.3 | 15.8 | 16 | 16.3 | 15.8 | 16 | 24 | 25 | 25 |
3” | 5.2 | 3.8 | 5.1 | 7.3 | 5.9 | 7.2 | 8.7 | 7.3 | 8.9 | 15 | 12.3 | 16.8 | 21 | 21.5 | 19.5 | 42.6 | 38 | 39 |
3-1/2” | 6.4 | 5 | 6.5 | 8.9 | 7.5 | 9.2 | 11.6 | 9 | 12.7 | – | – | – | – | – | – | – | – | – |
4” | 7.5 | 5.6 | 7.5 | 11.8 | 10 | 12.2 | 18.4 | 16.5 | 18.6 | 24 | 23.2 | 24.5 | 31.8 | 31 | 33 | 64 | 58 | 60 |
5” | 9.2 | 6.5 | 9.2 | 16 | 12.5 | 16 | 31 | 28.5 | 30.8 | 38.5 | 37.5 | 39.5 | 59 | 58.8 | 60 | 111 | 95 | 101 |
6” | 11.0 | 8.1 | 11.8 | 20.2 | 16.5 | 22 | 37 | 36.2 | 38 | 50 | 48.3 | 51.5 | 72 | 74 | 75 | 171 | 146 | 156 |
8” | 18.4 | 13 | 20.4 | 31.2 | 25.5 | 36 | 54.5 | 51.5 | 62.2 | 85 | 75 | 89 | 124 | 112 | 125 | 261 | 220 | 242 |
10” | 25.5 | 18.4 | 31 | 44.3 | 35 | 55 | 98.5 | 76.2 | 102 | 123 | 110 | 131 | 207 | 184 | 215 | 485 | 420 | 465 |
12” | 37 | 28.5 | 47 | 63.5 | 52 | 82.5 | 105 | 89.5 | 132 | 168 | 146 | 187 | 306 | 264 | 316 | 698 | 590 | 665 |
14” | 51 | 37.5 | 60 | 86 | 73 | 108 | 150 | 102 | 158 | 198 | 172 | 224 | 416 | – | – | – | – | – |
16” | 61.5 | 44.5 | 61 | 112 | 88 | 139 | 177 | 150 | 225 | 225 | 192 | 259 | 567 | – | – | – | – | – |
18” | 71.5 | 54 | 93 | 141 | 115 | 178 | 228 | 180 | 285 | 318 | 272 | 383 | 736 | – | – | – | – | – |
20” | 85 | 72 | 127 | 173 | 139 | 228 | 285 | 231 | 365 | 376 | 330 | 482 | 929 | – | – | – | – | – |
24” | 119 | 95 | 190 | 248 | 212 | 350 | 372 | 330 | 532 | 680 | 632 | 905 | 1504 | – | – | – | – | – |
Pressure Rating Of Weldneck Flanges
ANSI/ASME B16.34 | ANSI PRESSURE RATING | ||||||
Temperature (in F°) | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
< 100 | 285 | 740 | 985 | 1480 | 2220 | 3705 | 6170 |
200 | 260 | 680 | 905 | 1360 | 2035 | 3395 | 5655 |
300 | 230 | 655 | 870 | 1310 | 1965 | 3270 | 5450 |
400 | 200 | 635 | 845 | 1265 | 1900 | 3170 | 5280 |
500 | 170 | 605 | 805 | 1205 | 1810 | 3015 | 5025 |
600 | 140 | 570 | 755 | 1135 | 1705 | 2840 | 4730 |
650 | 125 | 550 | 730 | 1100 | 1650 | 2745 | 4575 |
700 | 110 | 530 | 710 | 1060 | 1590 | 2655 | 4425 |
750 | 95 | 505 | 675 | 1015 | 1520 | 2535 | 4230 |
800 | 80 | 410 | 550 | 825 | 1235 | 2055 | 3430 |
850 | 65 | 320 | 425 | 640 | 955 | 1595 | 2655 |
900 | 50 | 230 | 305 | 460 | 690 | 1150 | 1915 |
950 | 35 | 135 | 185 | 275 | 410 | 685 | 1145 |
1000 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
Hydrostatic Test Pressure (in Psig) | 450 | 1125 | 1500 | 2225 | 3350 | 5575 | 9275 |
ANSI/ASME B16.34 | ANSI PRESSURE RATING | ||||||
Temperature in C° | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
-29 / 38 | 19.6 | 51.1 | 68.1 | 102.1 | 153.2 | 255.3 | 425.5 |
50 | 19.2 | 50.1 | 66.8 | 100.2 | 150.4 | 250.6 | 417.7 |
100 | 17.7 | 46.6 | 62.1 | 93.2 | 139.8 | 233 | 388.3 |
150 | 15.8 | 45.1 | 60.1 | 90.2 | 135.2 | 225.4 | 375.6 |
200 | 13.8 | 43.8 | 58.4 | 87.6 | 131.4 | 219 | 365 |
250 | 12.1 | 41.9 | 55.9 | 83.9 | 125.8 | 209.7 | 349.5 |
300 | 10.2 | 39.8 | 53.1 | 79.6 | 119.5 | 199.1 | 331.8 |
325 | 9.3 | 38.7 | 51.6 | 77.4 | 116.1 | 193.6 | 322.6 |
350 | 8.4 | 37.6 | 50.1 | 75.1 | 112.7 | 187.8 | 313 |
375 | 7.4 | 36.4 | 48.5 | 72.7 | 109.1 | 181.8 | 303.1 |
400 | 6.5 | 34.7 | 46.3 | 69.4 | 104.2 | 173.6 | 289.3 |
425 | 5.5 | 28.8 | 38.4 | 57.5 | 86.3 | 143.8 | 239.7 |
450 | 4.6 | 23 | 30.7 | 46 | 69 | 115 | 191.7 |
475 | 3.7 | 17.4 | 23.2 | 34.9 | 52.3 | 87.2 | 145.3 |
500 | 2.8 | 11.8 | 15.7 | 23.5 | 35.3 | 58.8 | 97.9 |
Price Of Weldneck Flanges
Stainless Steel Flanges | USD $2.05 - $10.06 / Piece (FOB Price) on request |
High Nickel Alloys Flanges | USD $8.10 - $20.20 / Piece (FOB Price) on request |
Duplex & Super Duplex Flange | USD $10.20 - $35.50 / Piece (FOB Price) on request |
Cupro Nickel Flanges | USD $5.19 - $10.48 / Piece (FOB Price) on request |
Carbon Steel Flanges | USD $2.08 - $7.10 / Piece (FOB Price) on request |
Application Of Weldneck Flanges

We make sure that our every product is made of high quality raw material. We thoroughly test each and every product before dispatching it to our customers.
- Petrochemical Industries
- Power Generation Industries
- Food Processing Industries
- Oil & Gas Industries
- Sugar Industries
Testing Of Weldneck Flanges
We known for its accurate and perfect dimensions. We thoroughly test all our products before shipping them to the customers. We carry out destructive as well as non-destructive tests on all our products.
- Eddy Current Examining
- Hydrostatic Analysis
- Pitting Protection Test
- Power Generation Industries
- Positive Material Recognition

Packing Of Weldneck Flanges

We uses the most safest and the most effective ways of packaging for all types of deliveries. We pack our goods in various ways such as:
- Wooden Boxes
- Wooden Pallets
- Shrink-Wrapped
- Carton Boxes
- Wooden crates
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Types of Flanges
- Forge Flange
- Blind Flange
- Slip On Flange
- Weldneck Flange
- Lap Joint Flange
- Threaded Flange
- Socketweld Flange
- Long Weld Neck Flange
- Weldo / Nipo Flange
- Orifice Flange
- Reducing Flange
- Flat Flange
- Loose Flange
- RTJ Flanges
- SORF Flanges
- Square Flanges
- SWRF Flanges
- Expander Flanges
- WNRF Flanges
- Ring Type Joint Flanges
- Groove & Tongue Flanges
- Spectacle Blind Flanges
- Weld Neck Flanges A / B Flanges
- Spades Ring Spacers Flanges
- Screwed Flanges
- Forging Facing Flanges
- Flanges Bolts