ASME B16.5 Forged Weld Neck Flange (WN Flange)
High-Pressure forged flange for critical service piping. Backed by 20+ years of manufacturing expertise.
Size: 1/2″ to 60″
Pressure: Class 150-2500
Facing: Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ),Male/Female, Tongue/Groove
Material: Carbon, Stainless, Alloy Steel
Standard：ASME B16.5/B16.47, API605, MSS SP44,DIN 2631-2637, EN 1092-1, GOST 12821-80,BS,JIS2220
Standard & Custom Flange Solutions
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Asme16.5 class150 WN flange dimensions specification
| Nominal Pipe Size | Outside Diam. (D) | Diam. at Base of Hub (X) | O.D. of Raised Face (G) | Thickness (t) | Bore (Weld. Neck / Socket Weld.) (B1) | Length Thru Hub (Weld. Neck)(T1) | Diam. of Hub at Bevel (A) | Radius of Fillet (R) |
|---|---|---|---|---|---|---|---|---|
| 1/2 | 89 | 30.2 | 35.1 | 11.2 | 15.7 | 47.8 | 21.3 | 3 |
| 3/4 | 99 | 38.1 | 42.9 | 12.7 | 20.8 | 52.3 | 26.7 | 3 |
| 1 | 108 | 49.3 | 50.8 | 14.2 | 26.7 | 55.6 | 33.5 | 3 |
| 1 1/4 | 117 | 58.7 | 63.5 | 15.7 | 35.1 | 57.2 | 42.2 | 4.8 |
| 1 1/2 | 127 | 65 | 73.2 | 17.5 | 40.9 | 62 | 48.3 | 6.4 |
| 2 | 152 | 77.7 | 91.9 | 19.1 | 52.6 | 63.5 | 60.5 | 7.9 |
| 2 1/2 | 178 | 90.4 | 104.6 | 22.4 | 62.7 | 69.9 | 73.2 | 7.9 |
| 3 | 191 | 108 | 127 | 23.9 | 78 | 69.9 | 88.9 | 9.7 |
| 3 1/2 | 216 | 122.2 | 139.7 | 23.9 | 90.2 | 71.4 | 101.6 | 9.7 |
| 4 | 229 | 134.9 | 157.2 | 23.9 | 102.4 | 76.2 | 114.3 | 11.2 |
| 5 | 254 | 163.6 | 185.7 | 23.9 | 128.3 | 88.9 | 141.2 | 11.2 |
| 6 | 279 | 192 | 215.9 | 25.4 | 154.2 | 88.9 | 168.4 | 12.7 |
| 8 | 343 | 246.1 | 269.7 | 28.4 | 202.7 | 101.6 | 219.2 | 12.7 |
| 10 | 406 | 304.8 | 323.9 | 30.2 | 254.5 | 101.6 | 273.1 | 12.7 |
| 12 | 483 | 365.3 | 381 | 31.8 | 304.8 | 114.3 | 323.9 | 12.7 |
| 14 | 533 | 400.1 | 412.8 | 35.1 | 336.6 | 127 | 355.6 | 12.7 |
| 16 | 597 | 457.2 | 469.9 | 36.6 | 387.4 | 127 | 406.4 | 12.7 |
| 18 | 635 | 505 | 533.4 | 39.6 | 438.2 | 139.7 | 457.2 | 12.7 |
| 20 | 699 | 558.8 | 584.2 | 42.9 | 489 | 144.5 | 508 | 12.7 |
| 24 | 813 | 663.4 | 692.2 | 47.8 | 590.6 | 152.4 | 609.6 | 12.7 |
(2) Class 150 flanges except Lap Joint will be furnished with 0.06″ 1.6mm raised face, which is included in ‘Thickness’ t and ‘Length through Hub’ T1, T2.
(3) For Slip-on, Threaded, Socket Welding and Lap Joint Flanges, the hubs can be shaped either vertical from base to top or tapered within the limits of 7 degrees.
Technical Category
Pipe Flanges Dimension
Steel Pipe And Fittings Dimension
Material Specifications
| ASME B16.5 Welding Neck Flanges | ASME B16.47 Series B Welding Neck Flanges | ASME B16.47 Series A Welding Neck Flanges |
| Class 150 | Class 75 | |
| Class 300 | Class 150 | Class 150 |
| Class 600 | Class 300 | Class 300 |
| Class 900 | Class 400 | Class 400 |
| Class 1500 | Class 600 | Class 600 |
| Class 2500 | Class 900 | Class 900 |
Custom Flange Needs?
Frequently Asked Questions
What standards and pressure ratings do LeKe’s forged flanges comply with?
LeKe Piping supplies forged flanges complying strictly with ASME B16.5, DIN, and EN1092-1 standards. Our production range covers pressure ratings from Class 150 to Class 2500 and PN6 to PN100. Every flange undergoes ultrasonic testing (UT) and PMI verification to guarantee zero-leakage performance in high-pressure oil and gas environments.
Can you provide custom or non-standard flange solutions?
Absolutely. With 20 years of manufacturing expertise, we specialize in producing flanges with custom dimensions, special pressure ratings, and unique facing requirements that go beyond standard specifications. Simply provide your drawings or technical requirements, and our engineers will handle the rest.
What sourcing standards do LeKe’s forged flanges comply with?
Our forged flanges fully comply with ASME B16.5, DIN, and EN1092 standards, supporting exotic alloys like Duplex and Inconel.
Which international standards do your products comply with?
Our products are strictly manufactured according to global industrial standards, including ASME/ANSI B16.5 & B16.47, EN 1092-1, DIN, GOST 12821-80, and MSS SP44. We ensure full compatibility for projects in the Middle East, Russia, and Southeast Asia.
How do you ensure material quality and traceability?
Quality is our baseline. Every shipment is accompanied by an EN 10204 3.1 MTC (Material Test Report). We implement 100% material traceability from raw steel to finished products, including PMI (Positive Material Identification) testing to ensure the chemical composition meets your exact needs.
Do you support third-party inspections?
Yes, we highly welcome third-party inspections. We regularly cooperate with international agencies such as SGS, BV, TUV, and ABS to conduct pre-shipment inspections. This transparency ensures that the products you receive meet 100% of the agreed quality standards.
What is your typical lead time for standard and custom orders?
For standard sizes (ANSI/DIN), we maintain a consistent stock for rapid dispatch within 10 days. For custom forged products, the typical lead time is 15-25 days, depending on the material and quantity. We prioritize efficiency to keep your project on schedule.
Can’t find your answer?
Our engineers are ready to provide custom solutions for your specific piping projects. We typically respond within 24 hours.