A premier manufacturer and global exporter of high-quality Flanges, Pipe Fittings, and Forged Fittings. Delivering precision-engineered solutions in Stainless, Carbon, and Alloy Steel to over 60 countries.
The gold standard for high-pressure, high-temperature, and fluctuating stress applications.
The SOTCO Weld Neck Flange is distinguished by its long tapered hub that transitions gradually from the flange thickness to the pipe wall thickness. This design reinforcement transfers stress from the flange to the pipe, reducing stress concentration at the base of the hub.
Engineering Precision: The bore of the flange is machined to match the ID of the mating pipe perfectly. This eliminates turbulence and erosion, making it the ideal choice for critical pipelines in oil & gas, power generation, and nuclear industries.
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Dimensional Standards | ANSI B16.5, ANSI B16.47 (Series A & B), MSS SP44, API-605, AWWA |
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Size Range | Standard: 1/2″ - 24″ Large Dia: 26" - 48" Custom: Up to 1200NB |
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Pressure Ratings |
ASME: 150#, 300#, 400#, 600#, 900#, 1500#, 2500# DIN/PN: PN6, PN10, PN16, PN25, PN40, PN64, PN100 |
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Schedules (Bore) |
Sch 10, 20, 30, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS (Must specify pipe schedule when ordering) |
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Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
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Connection Type | Butt-Weld (Full Penetration V-Groove weld to pipe) |
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Surface Coating | Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Hot Dip Galvanized |
ASTM A105 / A105N
ASTM A350 LF2 (Low Temp)
ASTM A694 F42 - F70 (High Yield)
ASTM A182 F304/L, F316/L
ASTM A182 F321, F347, F310
F904L (Urea Grade)
ASTM A182 F11, F22
ASTM A182 F5, F9
ASTM A182 F91 (High Temp)
Duplex 2205, Super Duplex
Inconel 625, Monel 400
Hastelloy C276, Copper Nickel
| Nominal Size (NPS) |
Flange Data (in) | Hub Dimensions (in) | Drilling (in) | ||||||
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| O.D (O) | Thick (C) | R.F (R) | Len (Y) | Base (X) | Neck (A) | Circle | Holes | Dia | |
| 1/2" | 3.50 | 0.44 | 1.38 | 1.88 | 1.19 | 0.84 | 2.38 | 4 | 0.62 |
| 3/4" | 3.88 | 0.50 | 1.69 | 2.06 | 1.50 | 1.05 | 2.75 | 4 | 0.62 |
| 1" | 4.25 | 0.56 | 2.00 | 2.19 | 1.94 | 1.32 | 3.12 | 4 | 0.62 |
| 1 1/4" | 4.62 | 0.62 | 2.50 | 2.25 | 2.31 | 1.66 | 3.50 | 4 | 0.62 |
| 1 1/2" | 5.00 | 0.69 | 2.88 | 2.44 | 2.56 | 1.90 | 3.88 | 4 | 0.62 |
| 2" | 6.00 | 0.75 | 3.62 | 2.50 | 3.06 | 2.38 | 4.75 | 4 | 0.75 |
| 3" | 7.50 | 0.94 | 5.00 | 2.75 | 4.25 | 3.50 | 6.00 | 4 | 0.75 |
| 4" | 9.00 | 0.94 | 6.19 | 3.00 | 5.31 | 4.50 | 7.50 | 8 | 0.75 |
| 6" | 11.00 | 1.00 | 8.50 | 3.50 | 7.56 | 6.62 | 9.50 | 8 | 0.88 |
The tapered hub reinforces the flange, transferring stress to the pipe effectively.
Ideal for extreme temperature fluctuations and high-pressure service conditions.
Full Radiography (RT) possible on the butt-weld joint to ensure zero defects.