American standard weld neck flange with tapered hub. ASME B16.5 (up to NPS 24) & ASME B16.47 Series A/B (NPS 26-60). 1/2"-60", 150-2500LB.
The ASME B16.5 Weld Neck Flange (WN) features a long tapered hub that transitions smoothly into the pipe bore, providing the highest mechanical strength and fatigue resistance among all flange types. The hub is butt-welded to the pipe, making it the preferred choice for critical service applications involving high pressure, high temperature, or cyclic loading conditions.
JIAJI FORGING manufactures Weld Neck flanges in austenitic stainless steel, duplex & super duplex stainless steel (UNS S32205, S32750), and nickel alloys (Inconel, Hastelloy, Monel) for the global market.
RF
Raised Face
FF
Flat Face
RTJ
Ring Joint
| Parameter | Specification |
|---|---|
| Standard | ASME B16.5 (NPS 1/2"-24") ASME B16.47 Series A (NPS 26-60) |
| Size Range | NPS 1/2" - NPS 60" (DN15 - DN1500) |
| Pressure Rating | Class 150 / 300 / 400 / 600 / 900 / 1500 / 2500 |
| Face Finish | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
| Materials | 304/304L (F8), 316/316L (F8A), 321 (F8C), 347 (F8D), 310S, 904L, 2205 (F51), 2507 (F53), Inconel 625, Inconel 825, Hastelloy C276, Monel 400 |
| Surface | Anti-rust oil, black, galvanized, painted |
PDF dimension tables by pressure class:
| UNS / AISI | ASTM |
|---|---|
| 304 / 304L | A182 F8 / F8A |
| 316 / 316L | A182 F8 / F8A |
| 321 | A182 F8C |
| 347 | A182 F8D |
| 310S | A182 F310 |
| 904L | A182 F904L |
| UNS | ASTM |
|---|---|
| S31803 (2205) | A182 F51 |
| S32205 (2205) | A182 F51 |
| S32750 (2507) | A182 F53 |
| S32760 | A182 F55 |
| UNS / Alloy | ASTM |
|---|---|
| N06625 (Inconel 625) | A182 F65 |
| N08825 (Incoloy 825) | - |
| N10276 (Hastelloy C276) | - |
| N04400 (Monel 400) | - |
Per ASME B16.5, each flange is permanently marked with: Manufacturer / Material / Pressure Class / Size / Face Type / Heat No.
Example: JIAJI · F316 · WN · 4" · CL150 · RF · BATCH-2024
Optional: NACE MR0175 / ISO 15156, 3.1 / 3.2 inspection certificates (EN 10204), API 6A, CE marking (PED 2014/68/EU) available upon request.
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