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Weld Neck Flange

Weld Neck Flange: Specifications | Materials | Types | Dimensions | Weight Chart | Tolerances | FAQ

Weld Neck Flange ASME B16.5 / B16.47 (Series A & Series B) – Leading Manufacturer & Stockist of Flanges in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex & High Nickel Alloys. Available from ½”–24” (B16.5) and 26”–60” (B16.47) in pressure classes 150#–2500#. Widely supplied to oil, gas, petrochemical & power industries across USA, Europe, Middle East & South America.

ASME B16.5 / B16.47 (Series A & Series B) Weld Neck Flange

Best Export Prices: sales@midlandforgefittings.com

Midland Forge and Fittings Pvt. Ltd. is a trusted name in the field of industrial piping solutions, delivering precision-engineered flanges and fittings to global markets. With a focus on quality, innovation, and reliability, we specialize in manufacturing products that meet international standards such as ASME, ANSI, DIN, and EN.

Our state-of-the-art facility is equipped with advanced forging and machining technology, enabling us to produce flanges that perform seamlessly in high-pressure, high-temperature, and corrosive environments. Over the years, we have built a reputation for supplying critical components to industries such as oil & gas, petrochemicals, and water treatment across USA, Europe, Middle East, and Asia.

Our Weld Neck Flanges are designed and manufactured in strict compliance with ASME B16.5 and ASME B16.47 standards. Known for their strength and leak-proof connection, these flanges are widely used in demanding applications where reliability and durability are essential. The long tapered hub ensures smooth stress distribution, making them ideal for high-pressure and high-temperature piping systems.

We offer WNRF Flange in a wide range of materials, including carbon steel, stainless steel, alloy steel, duplex, super duplex, and high nickel alloys. Sizes are available from ½” to 24” (ASME B16.5) and 26” to 60” (ASME B16.47), with pressure classes ranging from 150# to 2500#. Each flange undergoes rigorous quality checks, including dimensional inspection, material traceability, and pressure testing, to ensure maximum performance and safety.

Our Weld Neck Raised Flanges are extensively supplied to refineries, chemical plants, LNG terminals, offshore platforms, and power generation units. Whether you require standard sizes or custom-engineered solutions, Midland Forge and Fittings Pvt. Ltd. ensures timely delivery and consistent quality for critical pipeline projects.

ASME B16.5 WNRF Flange

Weld Neck Pipe Flange Specifications

Size Range

15mm ( 1/2" NPS ) up to 600mm ( 24" NPS ), For 2500# in sizes from NPS 1/2 to NPS 12

Pressure Rating - Class

150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS, 2500 LBS

Marking

Grade / Material, Size (NPS or DN), Pressure Class (PN), Heat No, Standard, Manufacturer’s Name or Trademark

Face Type / Flange Connection Type

Flat Face (FF), Raise Face (RF), Ring Joint (RJT), Tongue and Groove (T&G), Male and Female (M&F)

Flange Form

WNRF

Manufacturing Standards

ASTM (A105, A182, A350, A694, B564), ASME/ANSI, MSS-SP-44, API 6A.

Materials

Stainless Steel, Carbon Steel, Alloy Steel, Duplex Steel, Super Duplex, Nickel, Inconel, Incoloy, Hastelloy, Monel, Alloy 20, 254 SMO, Copper Nickel, Titanium.

Test Certificates

EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report, etc

Dimensional Standards

ANSI B16.5, ANSI B16.47, ANSI B16.36, ANSI B16.48, BS 4504, EN1092, UNI 2277/2278, DIN, JIS, SABS1123, GOST-12820

Testing

Direct-reading Spectrograph, Hydrostatic testing machine, X-ray detector, UI trasonic flaw detector, Magnetic particle detector

Flange Coating/Surface Treatment

Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Cold and Hot Dip Galvanized

Production technique

Forged, Heat treated and machined
ASME B16.47, MSS SP - 44 WN Flange

Weld Neck Flanges – Materials, Grades & Standards

Material Category Standards / Grades (ASTM / ASME) Pressure Class / Size Range Typical Use / Application
Stainless Steel ASTM A182 F304 / F304L / F304H Class 150 – 2500, Size ½”–48” General purpose, corrosion-resistant piping
ASTM A182 F316 / F316L / F316H Class 150 – 2500, Size ½”–48” Chemical, marine, food & pharma industries
ASTM A182 F321 / F321H Class 150 – 1500, Size ½”–24” High temperature, stabilized service
Carbon Steel ASTM A105 (Forged CS) Class 150 – 2500, Size ½”–48” Pressure piping, oil & gas, general industries
ASTM A350 LF2 (Low Temp CS) Class 150 – 1500, Size ½”–24” Cryogenic & low temperature applications
Alloy Steel ASTM A182 F11 / F22 (Cr-Mo) Class 150 – 2500, Size ½”–24” Power plants, refineries, steam pipelines
ASTM A182 F91 Class 150 – 2500, Size ½”–24” High-temperature, power generation
Duplex / Super Duplex ASTM A182 F51 / F53 / F55 / F60 (UNS S31803 / S32205 / S32750 / S32760) Class 150 – 2500, Size ½”–24” Offshore, seawater, high corrosion service
Nickel Alloys ASTM B564 Inconel 600 / 625 / 718 Class 150 – 2500, Size ½”–24” Heat exchangers, chemical, aerospace
ASTM B564 Monel 400 / K500 Class 150 – 2500, Size ½”–24” Marine, seawater handling, pumps
Copper Nickel ASTM B151 / B467 (Cu-Ni 90/10, 70/30) Class 150 – 600, Size ½”–24” Shipbuilding, desalination, seawater systems
Titanium ASTM B381 Gr. 2 / Gr. 5 Class 150 – 600, Size ½”–12” Aerospace, seawater, lightweight piping
Aluminium ASTM B247 6061 / 5083 Class 150 – 300, Size ½”–12” Lightweight, non-corrosive, low-pressure piping
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ANSI/ASME B16.47 Class 150 Weld Neck Flange – Dimensions & Sizes in mm

Dimensions of ANSI/ASME B16.47 Weld Neck Flanges
Nominal
Pipe Size		 OD of
Flange
(O)		 Thickness
of Flange
(C)		 Length
thru Hub
(V)		 Dia of
Hub at base
(X)		 Dia of
Hub at end
(A)		 Dia of
Raised Face
(R)		 Dia of
Bolt Circle		 No of
Bolt
Holes		 Dia of
Bolt
Holes		 Dia of
Bolt		 Fillet
Radius
(r1)
26 870 68.3 120.7 676.1 660.4 749.3 806.5 24 35.1 31.8 9.7
28 927.1 71.4 125.5 726.9 711.2 800.1 863.6 28 35.1 31.8 11.2
30 984.30 74.70 136.7 781.1 762 857.3 914.4 28 35.1 31.8 11.2
32 1060.5 81 144.5 831.9 812.8 914.4 977.9 28 41.1 38.1 11.2
34 1111.3 82.6 149.4 882.7 863.6 965.2 1028.7 32 41.1 38.1 12.7
36 1168.4 90.4 157.2 933.5 914.4 1022.4 1085.9 32 41.1 38.1 12.7
38 1238.3 87.4 157.2 990.6 965.2 1073.2 1149.4 32 41.1 38.1 12.7
40 1289 90.4 163.6 1041.4 1016 1124 1200.2 36 41.1 38.1 12.7
42 1346.2 96.8 171.5 1092.2 1066.8 1193.8 1257.3 36 41.1 38.1 12.7
44 1403.4 101.6 177.8 114.3 1117.6 1244.6 1314.5 40 41.1 38.1 12.7
46 1454.2 103.1 185.7 1196.8 1168.4 1295.4 1365.3 40 41.1 38.1 12.7
48 1511.3 108 192 1247.6 1219.2 1358.9 1422.4 44 41.1 38.1 12.7
50 1568.5 111.3 203.2 1301.8 1270 1409.7 1479.6 44 47.8 44.5 12.7
52 1625.6 115.8 209.6 1352.6 1320.8 1460.5 1530.4 44 47.8 44.5 12.7
54 1682.8 120.7 215.9 1403.4 1371.6 1511.3 1593.9 44 47.8 44.5 12.7
56 1746.3 124 228.6 1457.5 1422.4 1574.8 1651 48 47.8 44.5 12.7
58 1803.4 128.5 235 1508.3 1473.2 1625.6 1708.2 48 47.8 44.5 12.7
60 1854.2 131.8 239.8 1559.1 1524 1676.4 1759 52 47.8 44.5 12.7

ANSI/ASME B16.47 Class 300 Weld Neck Flange – Dimensions & Sizes in mm

Nominal
Pipe Size		 OD of
Flange (O)		 Thickness
of Flange (C)		 Length
thru Hub
(V)		 Dia of
Hub at base
(X)		 Dia of
Hub at end
(A)		 Dia of
Raised Face
(R)		 Dia of
Bolt Circle		 No of
Bolt
Holes		 Dia of
Bolt
Holes		 Dia of
Bolt		 Fillet
Radius
(r1)
26 971.6 79.2 184.2 720.9 660.4 749.3 876.3 28 44.5 41.4 9.7
28 1035.1 85.9 196.9 774.7 711.2 800.1 939.8 28 44.5 41.4 11.2
30 1092.2 91.9 209.6 827 762 857.3 997 28 47.8 44.5 11.2
32 1149.4 98.6 222.3 881.1 812.8 914.4 1054.1 28 50.8 47.8 11.2
34 1206.5 101.6 231.6 936.8 863.6 965.2 1104.9 28 50.8 47.8 12.7
36 1270 104.6 241.3 990.6 914.4 1022.4 1168.4 32 53.8 50.8 12.7
38 1168.4 108 180.8 993.6 965.2 1028.7 1092.2 32 41.1 38.1 12.7
40 1238.3 114.3 193.5 1054.6 1016 1085.9 1155.7 32 44.5 41.4 12.7
42 1289.1 119.1 200.2 1098.6 1066.8 1136.7 1206.5 32 44.5 41.4 12.7
44 1352.6 124 206.2 1149.4 1117.6 1193.8 1263.7 32 47.8 44.5 12.7
46 1416.1 128.5 215.9 1203.5 1168.4 1244.6 1320.8 28 50.8 47.8 12.7
48 1466.9 108 192 1247.6 1219.2 1358.9 1422.4 32 41.1 38.1 12.7
50 1530.4 139.7 231.6 1305.1 1270 1358.9 1428.8 32 53.8 50.8 12.7
52 1581.2 144.5 238.3 1355.9 1320.8 1409.7 1479.6 32 53.8 50.8 12.7
54 1657.4 152.4 252.5 1409.7 1371.6 1466.9 1549.4 28 60.5 57.2 12.7
56 1708.2 153.9 260.4 1463.5 1422.4 1517.7 1600.2 28 60.5 57.2 12.7
58 1759 158.8 266.7 1514.3 1473.2 1574.8 1651 32 60.5 57.2 12.7
60 1809.8 163.6 273.1 1565.1 1524 1625.6 1701.8 32 60.5 57.2 12.7

ANSI/ASME B16.47 Class 600 Weld Neck Flange – Dimensions & Sizes in mm

Nominal
Pipe Size		 OD of
Flange
(O)		 Thickness
of Flange
(C)		 Length
thru Hub
(V)		 Dia of
Hub at base
(X)		 Dia of
Hub at end
(A)		 Dia of
Raised Face
(R)		 Dia of
Bolt Circle		 No of
Bolt
Holes		 Dia of
Bolt
Holes		 Dia of
Bolt		 Fillet
Radius (r1)
26 1016 108 222.3 747.8 660.4 749.3 914.4 28 50.8 47.6 12.7
28 1073.2 111.3 235 803.1 711.2 800.1 965.2 28 53.8 50.8 12.7
30 1130.3 114.3 247.7 862.1 762 857.3 1022.4 28 53.8 50.8 12.7
32 1193.8 117.3 260.4 917.4 812.8 914.4 1079.5 28 60.5 57.2 12.7
34 1244.6 120.7 269.7 973.1 863.6 965.2 1130.3 28 60.5 57.2 14.2
36 1314.5 124 282.4 1031.7 914.4 1022.4 1193.8 28 60.5 57.2 14.2
38 1270 152.4 254 1022.4 965.2 1054.1 1162.1 28 60.5 57.2 14.2
40 1320.8 158.8 263.7 1073.2 1016 1111.3 1212.9 32 60.5 57.2 14.2
42 1403.4 168.1 279.4 1127.3 1066.8 1168.4 1282.7 28 66.5 63.5 14.2
44 1454 173 289.1 1181.1 1117.6 1225.6 1333.5 32 66.5 63.5 14.2
46 1511.2 179.3 300 1234.9 1168.4 1276.4 1390.7 32 66.5 63.5 14.2
48 1593.9 189 316 1289.1 1219.2 1333.5 1460.5 32 73.12 69.9 14.2
50 1670.1 196.9 328.7 1343.2 1270 1384.3 1524 28 79.2 76.2 14.2
52 1720.9 203.2 336.6 1394 1320.8 1435.1 1574.8 32 79.2 76.2 14.2
54 1778 209.6 349.3 1447.8 1371.6 1492.3 1632 32 79.2 76.2 14.2
56 1854.2 217.4 362 1501.6 1422.4 1543.1 1695.5 32 85.9 82.6 15.7
58 1905 222.3 369.8 1552.4 1473.2 1600.2 1746.3 32 85.9 82.6 15.7
60 1993.9 233.4 388.9 1609.9 1524 1657.4 1822.5 28 91.9 88.9 17.5

ANSI/ASME B16.47 Class 900 Weld Neck Flange – Dimensions & Sizes in mm

Nominal
Pipe Size		 OD of
Flange (O)		 Thickness
of Flange
(C)		 Length
thru Hub
(V)		 Dia of
Hub at base
(X)		 Dia of
Hub at end
(A)		 Dia of
Raised Face
(R)		 Dia of
Bolt Circle		 No of
Bolt
Holes		 Dia of
Bolt
Holes		 Dia of
Bolt		 Fillet
Radius
(r1)
26 1085.9 139.7 258.8 774.7 660.4 749.3 952.5 20 73.2 69.9 11.2
28 1168.4 142.7 298.5 831.9 711.2 800.1 1022.4 20 79.2 76.2 12.7
30 1231.9 149.4 311.2 889 762 857.3 1085.9 20 79.2 76.2 12.7
32 1314.5 158.8 330.2 946.2 812.8 914.4 1155.7 20 85.9 82.6 12.7
34 1397 165.1 349.3 1006.3 863.6 965.2 1225.6 20 91.9 88.9 14.2
36 1460.5 171.5 362 1063.8 914.4 1022.4 1289.1 20 91.9 88.9 14.2
38 1460.5 190.5 352.6 1073.2 965.2 1098.6 1289.1 20 91.9 88.9 19.1
40 1511.3 196.9 363.5 1127.3 1016 1162.1 1339.9 24 91.9 88.9 20.6
42 1562.1 206.2 371.3 1176.3 1066.8 1212.9 1390.7 24 91.9 88.9 20.6
44 1648 214.4 390.7 1234.9 1117.6 1270 1463.5 24 98.6 95.3 22.4
46 1733.6 225.6 411 1292.4 1168.4 1333.5 1536.7 24 104.6 101.6 22.4
48 1784.4 233.4 419.1 1343.2 1219.2 1384.3 1587.5 24 104.6 101.6 23.9

Weld Neck Piping Flange Weight Chart (lbs) – Pressure Class 150 to 2500

NPS (in) 150# 300# 600# 900# 1500# 2500#
1/2 3 4 5 6 8 15
3/4 3 5 6 8 10 19
1 4 6 8 10 14 27
1-1/4 5 8 11 14 20 39
1-1/2 6 10 14 18 27 51
2 9 16 22 28 41 77
2-1/2 11 21 32 41 61 115
3 14 28 43 55 82 155
3-1/2 18 36 55 72 108 204
4 21 43 67 88 132 249
5 31 62 97 126 190 359
6 39 82 129 167 251 476
8 63 131 206 267 401 760
10 92 196 307 397 596 1129
12 134 281 442 570 853 1621
14 164 340 540 695 1042 1978
16 220 456 725 932 1406 2672
18 262 543 862 1107 1670 3175
20 326 677 1075 1380 2086 3971
22 380 787 1245 1599 2414 4596
24 444 919 1455 1868 2820 5371

WNRF Flange Tolerances as per ANSI / ASME B16.5, 16.47

Parameter Tolerance (ASME B16.5 & B16.47) Notes
Outside Diameter of Flange (O.D.) ± 1.5 mm (up to 24”)± 3.0 mm (above 24”) Tighter control ensures bolt circle alignment.
Bolt Circle Diameter (BCD) ± 1.5 mm Critical for matching companion flanges.
Bolt Hole Diameter +1.5 mm / -0.0 mm Ensures clearance for bolts.
Bolt Hole Center-to-Center ± 1.0 mm Maintains correct alignment.
Flange Thickness (C/D) ± 1.5 mm (up to 24”)± 3.0 mm (above 24”) Ensures proper pressure containment.
Raised Face Diameter (RF) ± 1.0 mm Controls gasket seating area.
Raised Face Height +0.0 / -0.3 mm Must meet gasket compression requirements.
Hub Bore (to match pipe I.D.) +1.0 mm / -0.0 mm Must suit pipe wall thickness & schedule.
Hub Length (from flange face to bevel end) ± 1.5 mm Ensures proper welding length.
Bevel Angle ± 2° Standard 37.5° for welding end.
Flatness of Flange Face ≤ 0.5 mm (up to 10” dia)≤ 1.0 mm (above 10”) To ensure gasket tightness.
Concentricity of Bore to O.D. ≤ 1.5 mm Maintains balance & flow alignment.
Runout (Facing to Bore) ≤ 0.8 mm (B16.5)≤ 1.5 mm (B16.47) Important for gasket sealing integrity.
How to identify a Weld Neck Flange?

  • Long tapered hub extending from the flange base.

  • Beveled end prepared for butt-welding.

  • Markings on outer rim include:

    • Nominal Pipe Size (NPS)

    • Pressure Rating (Class 150–2500)

    • Material Grade (ASTM / ASME)

    • Standard (ASME B16.5 / B16.47)

    • Heat Number & Manufacturer’s Logo

  • Flange end is beveled to match the pipe.

  • Requires butt-weld joint, providing full penetration welding.

  • Welding must follow ASME Section IX (Welding Qualification).

  • Post-weld heat treatment (PWHT) may be required for alloy steels.

  • Proper alignment ensures flow efficiency and mechanical strength.

  • ASME B16.5: Covers flanges from ½” to 24”, for pressure class 150#–2500#.

  • ASME B16.47 Series A: Heavy-duty, thicker flanges for 26” to 60”, used in oil & gas and critical services.

  • ASME B16.47 Series B: Lighter, economical option for 26” to 60”, suitable for low to medium pressure pipelines.

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