Weld Neck Flange




Key Features
- High-pressure welded pipe flange
- Smooth flow with reduced stress concentration
- Long tapered hub design
- Description
- Technical Specification
- Materials & Grades
- Dimension
Weld Neck Flanges are one of the most commonly used flanges in high-pressure piping systems due to their superior strength and structural integrity. These flanges are designed with a long tapered hub that provides excellent reinforcement and helps in reducing stress concentration at the base of the flange. The gradual transition from flange thickness to pipe thickness ensures smooth flow of fluids and minimizes turbulence and erosion at the joint.
SAKSHI FORGE manufactures premium quality Weld Neck Flanges using advanced forging techniques and high-grade stainless steel materials. These flanges are widely used in industries such as oil & gas, petrochemical plants, power generation, refineries, and marine applications where high pressure and extreme temperatures are involved.
The inside diameter of the weld neck flange is machined to match the inside diameter of the pipe, ensuring unrestricted flow and improved efficiency. These flanges are butt-welded to the pipe, providing a strong and leak-proof connection. Due to their design, Weld Neck Flanges are highly resistant to pressure fluctuations, thermal expansion, and cyclic loading conditions.
Our Weld Neck Flanges are available in various sizes, pressure classes, and face types. They undergo strict quality control checks and are manufactured in compliance with international standards to ensure durability, reliability, and long service life.
Type | Weld Neck Flange |
Standards | ASME B16.5, ASME B16.47, ASTM A182 |
Size | ½” NB to 48” NB |
Pressure Ratings | Class 150, 300, 400, 600, 900, 1500, 2500 |
Face Type | RF, FF, RTJ |
Manufacturing | Forged |
Surface Treatment | Anti-rust Oil, Pickling, Passivation |
Tolerances | As per ASME B16.5 |
(Custom hub length and dimensions available on request)
Stainless Steel
ASTM A182 F304, F304L, F316, F316L, F321, F310, F347, F904L
Duplex Steel
UNS S31803, S32205
Super Duplex Steel
UNS S32750, S32760
Nickel Alloys
Inconel 600, 625, Monel 400, Hastelloy C276
Standard: ASME B16.5
Size (NB) | OD (mm) | Bolt Circle (mm) | No. of Holes | Hub Dia (mm) | Thickness (mm) |
½” | 88.9 | 60.3 | 4 | 30.2 | 9.6 |
1” | 108 | 79.4 | 4 | 38.1 | 11.2 |
2” | 152 | 120.7 | 4 | 60.3 | 14.3 |
4” | 229 | 190.5 | 8 | 114.3 | 23.9 |
6” | 279 | 241.3 | 8 | 168.3 | 25.4 |
8” | 343 | 298.5 | 8 | 219.1 | 28.6 |
10” | 406 | 362 | 12 | 273 | 30.2 |
12” | 483 | 431.8 | 12 | 323.9 | 31.8 |
(Custom sizes available on request)