Stainless Steel Weld Neck Flanges

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Stainless Steel Weld Neck Flanges ANSI B 16.5, ASME B 16.47 Stainless Steel Weld Neck Flange, ASTM A182 SS Weld Neck Flanges, SS Raised Face Weld Neck Flanges, SS 316 Weld Neck Flange, SS UNS S30400 / S31600 Weld Neck Flanges, Stainless Steel Werkstoff Nr. 1.4301 / 1.4401 Welding Neck Pipe Flanges in India

Stainless Steel Weld Neck Flanges are a type of flange designed to be welded to a piping system for reinforcement and connection purposes. They are commonly used in high-pressure and high-temperature applications where strength and durability are crucial. Weld neck flanges have a long, tapered hub that gradually transitions into the pipe, providing an ideal structure for a smooth and continuous flow of liquids or gases.

Stainless steel weld neck flanges are favored in critical applications due to their robust construction, resistance to corrosion, and ability to withstand high pressure and temperature conditions. Proper installation, welding, and maintenance are essential to ensure their optimal performance and longevity in industrial systems.

weld neck
Stainless Steel Weld Neck Flanges

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Weld Neck Flange Specification

Their distinct feature is their protruding neck. Long weld necks flanges have the same thickness as the pipe and are ideal for severe service conditions such as high pressure.

Specification Stainless Steel Weld Neck Flange
Weld Neck Flange Uses Stainless Steel Weld Neck Flange Mainly Used High And Medium Pressure Pipes Connecting.
EN Standard 6Bar/ 10Bar/ 16Bar/ 25Bar/ 40Bar
DIN Standard PN6/ PN10/ PN16/ PN25/ PN40/ PN64
JIS Standard 5K/ 10K/ 16K 20K/ 30K/ 40K/ 63K
Size Chart 1/2 Inch to 36 Inch, (Customized Up to 48")
Thickness Sch 10S To SCH 120
Other Standard B16.47 Series A & B/ B16.48, BS4504/ GOST
UNI Standard 6 Bar/ 10 Bar/ 16 Bar/ 25 Bar/ 40 Bar
Supporting Material Gasket/ Ring Joint/ Flange Bolts
ASME B16.5 Weld Neck Flange Face Types Raised Face Weld Neck Flanges Reducing Weld Neck Flanges Flat Face Weld Neck Flanges Weld Neck Orifice Flanges Rtj Weld Neck Flanges
Dimensions ASME B16.47 Series A And B ASME B16.5 EN 1092-1 ASA API-605 AWWA C207 MSS SP44 EN 1092-2
Test Certificates EN 10204/3.1B Raw Materials Certificate 100% Radiography Test Report Third Party Inspection Report, etc
Production Technique Forged/ Heat treated and machined
Manufacturer of Forged/ Threaded/ Screwed / Plate
Manufacturer Pressure Class Class 150 (lb) up to 24" Class 300 (lb) up to 20" Class 600 (lb) up to 20" Class 900 (lb) up to 16" Class 1500 (lb) up to 10" Class 2500 (lb) up to 8"
Flange Test Hydrostatic testing machine/ UI trasonic flaw detector/ X-ray detector/ Direct-reading Spectrograph/ Magnetic particle detector
Flange Equipment Pushing Machine/ electric bevelling machine/ Press machine/ Bending machine/ Sand-blasting machine etc
Coating Anti-rust Paint/ Zinc Plated/ Oil Black Paint/ Yellow Transparent/ Cold and Hot Dip Galvanized
Application Bitumen upgraders Heavy oil refineries. Nuclear power (mostly seamless). Petrochemicals and acids.
  • Price stability can be seen in Weld Neck Flange manufacturer in India
  • Stainless Steel Weld Neck Flange have high corrosion resistance, particularly to stress corrosion cracking
  • Very little or no maintenance material
  • Carbon Steel Weld Neck Flange are suitable for harsh conditions.
  • A largest Exporter, Source, Stock, Stockholder, Traders, Wholesaler, Manufacturer, Distributor, Suppliers, Dealer, Distributor, Importer, Fabricator & Stockist in Asia & Middle East.

Types Of Stainless Steel Weld Neck Flange

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SS Weld Neck Flange
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Stainless Steel Long Weld Neck Flange
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LWNRF Flange
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WNRF Flange
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Welding Neck Flange
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Weld Neck Pipe Flanges
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Raised Face Weld Neck Flange
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Flat Face Weld Neck Flange
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Reducing Weld Neck Flange
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Weld Neck Orifice Flange
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Rtj Weld Neck Flange
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Slip On Flange Welding
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Long Welding Neck
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3 Inch Weld Neck Flange
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6 Inch Weld Neck Flange

Weld Neck Flange Material Grade

Brass Weld Neck Flange 3602 / 2604 / H59 / H62 / etc.
Inconel Weld Neck Flange ASTM B564 / ASME SB564, Inconel 600/ 601/ 625/ 718/ 783/ 690/ x750 Weld Neck Flange
Carbon Steel Weld Neck Flange ASTM/ASME A/SA105 A/SA105N & A/SA216-WCB, DIN 1.0402, DIN 1.0460, DIN 1.0619, Die Steel, ASTM A105 / ASME SA105, A105N, ASTM A350 LF2 / ASME SA350, High Yield CS ASTM A694 / A694 (F52 F56 F60 F65 F70 F80)
DIN Standard PN6/ PN10/ PN16/ PN25/ PN40/ PN64
Stainless Steel Weld Neck Flange ASTM/ASME A/SA182 F304, F304L, F316, F316L, ASTM/ASME A/SA351 CF8/ CF3/ CF8M/ CF3M/ DIN 1.4301/ DIN 1.4306/ DIN 1.4401/ DIN 1.4404/ DIN 1.4308/ DIN 1.4408/ DIN 1.4306/ DIN 1.4409
Alloy Steel Weld Neck Flange ASTM A182 / ASME SA182 F5/ F9/ F11/ F12/ F22/ F91
Titanium Weld Neck Flange ASTM B381 / ASME SB381, Titanium Gr. 1, Titanium Gr. 2/ Titanium Gr. 4/ Titanium Gr. 5/ Titanium Gr. 7 ASTM R50250/GR.1 | R50400/GR.2 | R50550/GR.3 | R50700/GR.4 | GR.6 |R52400/GR.7 | R53400/GR.12 | R56320/GR.9 |R56400/GR.5
Monel Weld Neck Flange ASTM B564 / ASME SB564, Monel 400 (UNS No. N04400)/ Monel 500 (UNS No. N05500)
Copper Weld Neck Flange T1, T2, C10100/ C10200/ C10300/ C10400/ C10500/ C10700/ C10800/ C10910/C10920/ TP1/ TP2/ C10930/ C11000/ C11300/ C11400/ C11500/ C11600/ C12000/C12200/ C12300/ TU1/ TU2/ C12500/ C14200/ C14420/ C14500/ C14510/ C14520/ C14530/ C17200/ C19200/ C21000/ C23000/ C26000/ C27000/ C27400/ C28000/ C33000/ C33200/ C37000/ C44300/ C44400/ C44500/ C60800/ C63020/ C68700/ C70400/ C70600/ C70620/ C71000/ C71500/ C71520/ C71640 etc
Supporting Material Gasket/ Ring Joint/ Flange Bolts
Copper Nickel Weld Neck Flange ASTM / ASME SB 61 / 62 / 151 / 152/ Copper Nickel 90/10 (C70600 )/ Cupro Nickel 70/30 (C71500)/ UNS C71640
Alloy 20 Weld Neck Flange ASTM B462 / ASME SB462/ Carpenter® 20 Alloy/ Alloy 20Cb-3
Aluminium Weld Neck Flange 5052 /6061/ 6063 / 2017 / 7075 / etc.
Nickel Weld Neck Flange ASTM B564 / ASME SB564, Nickel 200/ Nickel 201/ Nickel 205/ Nickel 205LC
Duplex Weld Neck Flange S31803 / S32205 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Super Duplex Weld Neck Flange S32750 / S32760 A182 Gr F51 / F52 / F53 / F54 / F55 / F57 / F59 / F60 / F61
Incoloy Weld Neck Flange ASTM B564 / ASME SB564, Incoloy 800/ 800H/ 800HT (UNS N08800)/ 825 (UNS N08825)/ 925 Flanges
254 Smo Weld Neck Flange ASTM A182 / ASME SA182, SMO 254/6Mo/ UNS S31254/ DIN 1.4547
Nimonic Weld Neck Flange Nimonic 75/ Nimonic 80A/ Nimonic 90
Other Weld Neck Flange material Tin bronze/ Alumunum bronze/ Lead bronze

Weld Neck Flange Dimensions – ANSI/ASME B16.5 Class 150 to Class 2500

Size in Inch Size in mm Outer Diameter Flange Thick. Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 90 9.6 30 21.3 46 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
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
Size in Inch Size in mm Outer Diameter Flange Thick. Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 95 12.7 38 21.3 51 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
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
Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 95 14.3 38 21.3 52 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
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
Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 95 14.3 38 21.3 52 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 1.6
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
Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 120 22.3 38 21.3 60 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
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
Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 120 22.3 38 21.3 60 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
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
Size in Inch Size in mm Outer Diameter Flange Thickness Hub OD Weld Neck OD Welding Neck Length RF Diameter RF Height PCD Weld Face
A B C D E F G H I
1/2 15 135 30.2 43 21.3 73 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
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

Applications Of Weld Neck Flange

  • Specialty Chemicals
  • Power Generation
  • Condensers
  • Chemical Equipment
  • Gas Processing
  • Pulp and Paper Industry
  • Sea Water Equipment
  • Pharmaceutical Equipment
  • Off-Shore Oil Drilling Companies
  • Petrochemicals
  • Heat Exchangers
  • Pharmaceuticals

Stainless Steel Weld Neck Flange Weight Chart

Normal Size Of Steel Pipe In Inches Size In Millimeter WNRF Flanges Outer Daimeter (O.D.) In (MM) WNRF Flanges Wall Thickness Of (D) In (M) (ANSI B16.5 Weld Neck Flanges)

1/2

15

88.9

11.2

0.5

3/4

20

98.6

0.6

0.7

1

25

108

14.2

1

1 1/4

32

117.3

15.7

1.3

1 1/2

40

127

17.5

1.7

2

50

152.4

19.1

2.6

2 1/2

65

177.8

22.4

4.1

3

80

190.5

23.9

4.9

3 1/2

90

215.9

23.9

6.1

4

100

228.6

23.9

6.8

5

125

254

23.9

8.6

6

150

279.4

25.4

10.6

8

200

342.9

28.4

17.6

10

250

406.4

30.2

24

12

300

482.6

31.8

36.5

14

350

533.4

35.1

48.4

16

400

596.9

36.6

60.6

18

450

635

39.6

68.3

20

500

698.5

42.9

84.5

ASME B16.5 Weld Neck Flange Value Added Services

  • Chemical Analysis – Spectro Analysis
  • Intergranular Corrosion (IGC) Test
  • Hardness Test
  • Chemical Equipment
  • Chemical Equipment
  • Pitting Resistance Test
  • Positive Material Identification – PMI Testing
  • Micro and MacroTest
  • Flattening Test
  • Mechanical Testing Such as Tensile of Area

Weld Neck Flange Symbol

Weld Neck Flange Symbol
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