Weld Neck Flange in all standard face types and pressure classes. Compare quotes from verified suppliers on MetalMitra, with MTC 3.1 and worldwide delivery.
- Weld Neck Flange
- Weld Neck Flanges
- Welding Neck Flanges
- ANSI
- ASME
- DIN
- BS
- EN
- RF
- RTJ
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Source Weld Neck Flange from verified mills, manufacturers and stockists on MetalMitra. Options span all standard face types and pressure classes, and every order can ship with an EN 10204 3.1 certificate.
Weld Neck Flanges feature a long tapered hub that provides a gradual transition from the flange to the pipe. They are welded directly to the pipe and are commonly selected for applications involving pressure, temperature, cyclic loading and demanding process conditions.
Weld Neck Flanges are high-integrity flange components designed for welded pipe connections in industrial piping and pressure systems. Their tapered hub provides a gradual transition between the pipe and flange and makes them suitable for demanding process applications.
Key properties
- High-Integrity Connection — Long tapered hub provides a robust transition between pipe and flange.
- Pressure Applications — Suitable for demanding piping and pressure-system requirements.
- Multiple Face Types — Available in Raised Face, Flat Face and Ring Type Joint configurations.
- Wide Material Selection — Stainless steel, duplex, alloy steel, carbon steel and nickel alloys.
Weld Neck Flanges Specifications
Dimensions — ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges and custom dimensions.
Standards — ANSI B16.5, ANSI B16.47 Series A & B, MSS SP44, ASA, API-605, AWWA and custom drawings.
Pressure Class — 150 LBS, 300 LBS, 600 LBS, 900 LBS, 1500 LBS and 2500 LBS.
DIN Rating — DIN ND-6, ND-10, ND-16, ND-25, ND-40 and others.
Size — 1/8" NB to 48" NB.
Flange Face Type — Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ).
Manufacturing — Forged / Machined / Finished according to applicable specifications.
Customization — Available according to approved customer drawings and project requirements.
DIN, ANSI & BS Standards
| Standard | Applicable Standards |
|---|---|
| DIN | DIN 2527, DIN 2566, DIN 2573, DIN 2576, DIN 2641, DIN 2642, DIN 2655, DIN 2656, DIN 2627, DIN 2628, DIN 2629 |
| DIN | DIN 2631, DIN 2632, DIN 2633, DIN 2634, DIN 2635, DIN 2636, DIN 2637, DIN 2638, DIN 2673 |
| ANSI | ANSI B16.5, ANSI B16.47, MSS SP44, ANSI B16.36, ANSI B16.48 |
| BS | BS 4504, BS 1560, BS 10 |
Weld Neck Flange Face Types
Raised Face (RF) — Common industrial sealing configuration for pressure piping and process applications.
Flat Face (FF) — Flat sealing surface configuration for compatible piping and equipment connections.
Ring Type Joint (RTJ) — Precision-machined sealing groove for demanding pressure and process applications.
Weld Neck Flanges Material & Grades
Stainless Steel — ASTM A182 / A240 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H and 904L.
Duplex & Super Duplex Steel — ASTM / ASME A/SA 182 F44, F45, F51, F53, F55, F60 and F61.
Alloy Steel — ASTM / ASME A/SA 182 & A387 F1, F5, F9, F11, F12, F22 and F91.
Carbon Steel — ASTM / ASME A/SA 105, A350, A181 LF2, A516 Gr.70, A36 and A694 grades.
Nickel Alloys — Nickel 200, Nickel 201, Monel 400, Monel 500, Inconel 600, 601, 625, 800, 825, Hastelloy C276 and Alloy 20.
Copper Alloys — Cu-Ni 90/10, Cu-Ni 70/30 and selected UNS copper alloy grades.
Available Materials
| Material Category | Grades / Specifications |
|---|---|
| Stainless Steel | ASTM A182 / A240 F304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L |
| Duplex & Super Duplex | F44, F45, F51, F53, F55, F60, F61 |
| Alloy Steel | F1, F5, F9, F11, F12, F22, F91 |
| Carbon Steel | A105, A350, A181 LF2, A516 Gr.70, A36, A694 F42, F46, F52, F60, F65, F70 |
| Nickel Alloys | Nickel 200, Nickel 201, Monel 400, Monel 500, Inconel 600, 601, 625, 800, 825, Hastelloy C276, Alloy 20 |
| Copper Alloys | Cu-Ni 90/10, Cu-Ni 70/30 and selected UNS copper grades |
Weld Neck Flanges Dimensions — ASME B16.5
ANSI / ASME / ASA B16.5 — 150 LB RF — Welding Neck Flange
| Nominal Size | D | b | g | m | a | J* | h | k | Holes | l | Kg |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 88.9 | 11.1 | 34.9 | 30.2 | 21.3 | 15.7 | 47.6 | 60.3 | 4 | 15.9 | 0.500 |
| 3/4" | 98.4 | 12.7 | 42.9 | 38.1 | 26.7 | 20.8 | 52.4 | 69.8 | 4 | 15.9 | 0.700 |
| 1" | 107.9 | 14.3 | 50.8 | 49.2 | 33.5 | 26.7 | 55.6 | 79.4 | 4 | 15.9 | 1.100 |
| 1 1/4" | 117.5 | 15.9 | 63.5 | 58.8 | 42.2 | 35.1 | 57.1 | 88.9 | 4 | 15.9 | 1.500 |
| 1 1/2" | 127.0 | 17.5 | 73.0 | 65.1 | 48.3 | 40.9 | 61.9 | 98.4 | 4 | 15.9 | 1.800 |
| 2" | 152.4 | 19.0 | 92.1 | 77.8 | 60.3 | 52.6 | 63.5 | 120.6 | 4 | 19.0 | 2.700 |
| 2 1/2" | 177.8 | 22.2 | 104.8 | 90.5 | 73.1 | 62.7 | 69.8 | 139.7 | 4 | 19.0 | 4.400 |
| 3" | 190.5 | 23.8 | 127.0 | 107.9 | 88.9 | 78.0 | 69.8 | 152.4 | 4 | 19.0 | 5.200 |
| 3 1/2" | 215.9 | 23.8 | 139.7 | 122.2 | 101.6 | 90.2 | 71.4 | 177.8 | 8 | 19.0 | 6.400 |
| 4" | 228.6 | 23.8 | 157.2 | 134.9 | 114.3 | 102.4 | 76.2 | 190.5 | 8 | 19.0 | 7.500 |
| 5" | 254.0 | 23.8 | 185.7 | 163.5 | 141.2 | 128.3 | 88.9 | 215.9 | 8 | 22.2 | 9.200 |
| 6" | 279.4 | 25.4 | 215.9 | 192.1 | 168.4 | 154.2 | 88.9 | 241.3 | 8 | 22.2 | 11.000 |
| 8" | 342.9 | 28.6 | 269.9 | 246.1 | 219.1 | 202.7 | 101.6 | 298.4 | 8 | 22.2 | 18.300 |
| 10" | 406.4 | 30.2 | 323.8 | 304.8 | 273.0 | 254.5 | 101.6 | 361.9 | 12 | 25.4 | 25.000 |
| 12" | 482.6 | 31.7 | 381.0 | 365.1 | 323.8 | 304.8 | 114.3 | 431.8 | 12 | 25.4 | 39.000 |
| 14" | 533.4 | 34.9 | 412.7 | 400.0 | 355.6 | 336.5 | 127.0 | 476.2 | 12 | 28.6 | 51.000 |
| 16" | 596.9 | 36.5 | 469.9 | 457.2 | 406.4 | 387.3 | 127.0 | 539.7 | 16 | 28.6 | 60.000 |
| 18" | 635.0 | 39.7 | 533.4 | 504.8 | 457.2 | 438.1 | 139.7 | 577.8 | 16 | 31.7 | 71.000 |
| 20" | 698.5 | 42.9 | 584.2 | 558.8 | 508.0 | 488.9 | 144.5 | 635.0 | 20 | 31.7 | 88.000 |
| 22" | 749.3 | 46.0 | 641.2 | 609.6 | 558.8 | 539.7 | 149.2 | 692.1 | 20 | 34.9 | 102.000 |
| 24" | 812.8 | 47.6 | 692.1 | 663.6 | 609.6 | 590.5 | 152.4 | 749.3 | 20 | 34.9 | 119.000 |
*** Note:** — The data “J” corresponds to the STD schedule as provided in the dimensional reference.
Applications & industries
- Oil & Gas
- Petrochemical Plants
- Chemical Processing
- Power Generation
- Marine Industry
- Sugar Industry
- Nuclear Industry
- Defence Industry
- Refineries
- Pressure Vessels
- Process Piping
- Industrial Fabrication
Testing & documentation
Inspection and documentation for Weld Neck Flange follow the applicable standard plus any extra requirements in your PO.
- Dimensional inspection
- Visual and surface inspection
- Grade verification against the order
- Chemical composition verification
- Mechanical testing as applicable
- Hardness testing as applicable
- Flange face and sealing-surface inspection
- Bolt-hole and drilling inspection
- Non-destructive testing as applicable
- EN 10204 3.1 Mill Test Certificate
- Third-party inspection (TPI) on request
- Project-specific documentation on request
Why source on MetalMitra
- Verified suppliers — Mills, manufacturers and stockists are reviewed by the MetalMitra team before they list.
- One RFQ, several quotes — Share size, grade and quantity once and compare offers side by side.
- Full traceability — Heat numbers, EN 10204 3.1 MTCs and third-party inspection on request.
- Delivered worldwide — Export-worthy packing and shipping to India, the Middle East, Africa, Europe and the Americas.
Request pricing
Post an RFQ for Weld Neck Flange with your drawing or specification and receive quotes from verified suppliers.
Technical note: Values on this page are for reference. Always confirm against the governing standard, your purchase specification and the mill test certificate.
Applications & industries
- Oil & Gas
- Petrochemical Plants
- Chemical Processing
- Power Generation
- Marine Industry
- Sugar Industry
- Nuclear Industry
- Defence Industry
- Refineries
- Pressure Vessels
- Process Piping
- Industrial Fabrication
- Oil & Gas
- Petrochemical & Refining
- Power Generation
- Chemical Processing
- Marine & Shipbuilding
- Sugar
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