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.
Designed for high-pressure small-bore piping where smooth fluid flow is critical.
The SOTCO Socket Weld Flange features a unique counter-bore that accepts the pipe before welding. Unlike slip-on flanges, the bore of the flange matches the ID of the pipe, eliminating internal turbulence and erosion.
Key Advantage: They are attached by inserting the pipe into the socket end and applying a fillet weld on the top hub. This design is extensively used in high-pressure hydraulic systems and steam lines where joint strength and flow efficiency are paramount.
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Dimensional Standards | ANSI B16.5, ANSI B16.47 (Series A & B), MSS SP44, API-605, AWWA, Custom Drawings |
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Size Range | Standard: 1/2″ - 4″ Large: Up to 24″ (Low Pressure) Custom: Up to 48" |
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Pressure Ratings |
ASME: Class 150, 300, 600, 900, 1500, 2500 DIN/PN: PN6, PN10, PN16, PN25, PN40, PN64 |
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Schedules | SCH 10S, SCH 40S, SCH 80S, SCH 160, XXS (Matches Pipe ID) |
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Facing Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ) |
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Connection Type | Socket Insertion with External Fillet Weld (Optional Internal Weld) |
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Surface Coating | Anti-rust Paint, Oil Black Paint, Yellow Transparent, Zinc Plated, Hot Dip Galvanized |
ASTM A105 / A105N
ASTM A350 LF1, LF2, LF3
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 Dimensions (in) | Hub & Bore (in) | Drilling (in) | Weight (lbs) |
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| O.D (O) | Thick (T) | R.F (R) | Len (Y) | Hub (X) | Bore (B1) | Bore (B2) | Depth (D) | Circle (C) | Holes | Dia | ||
| 1/2" | 3.50 | 0.44 | 1.38 | 0.63 | 1.19 | 0.62 | 0.88 | 0.38 | 2.38 | 4 | 0.63 | 1 |
| 3/4" | 3.88 | 0.50 | 1.69 | 0.63 | 1.50 | 0.82 | 1.09 | 0.44 | 2.75 | 4 | 0.63 | 2 |
| 1" | 4.25 | 0.56 | 2.00 | 0.69 | 1.94 | 1.05 | 1.36 | 0.50 | 3.13 | 4 | 0.63 | 2 |
| 1 1/4" | 4.63 | 0.63 | 2.50 | 0.81 | 2.31 | 1.38 | 1.70 | 0.56 | 3.50 | 4 | 0.63 | 3 |
| 1 1/2" | 5.00 | 0.69 | 2.88 | 0.88 | 2.56 | 1.61 | 1.95 | 0.63 | 3.88 | 4 | 0.63 | 3 |
| 2" | 6.00 | 0.75 | 3.63 | 1.00 | 3.06 | 2.07 | 2.44 | 0.69 | 4.75 | 4 | 0.75 | 5 |
| 2 1/2" | 7.00 | 0.88 | 4.13 | 1.13 | 3.56 | 2.47 | 2.94 | 0.75 | 5.50 | 4 | 0.75 | 7 |
| 3" | 7.50 | 0.94 | 5.00 | 1.19 | 4.25 | 3.07 | 3.57 | 0.81 | 6.00 | 4 | 0.75 | 8 |
| 3 1/2" | 8.50 | 0.94 | 5.50 | 1.25 | 4.81 | 3.55 | 4.07 | 0.88 | 7.00 | 8 | 0.75 | 11 |
| 4" | 9.00 | 0.94 | 6.19 | 1.31 | 5.31 | 4.03 | 4.57 | 0.94 | 7.50 | 8 | 0.75 | 13 |
| 5" | 10.00 | 0.94 | 7.31 | 1.44 | 6.44 | 5.05 | 5.66 | 0.94 | 8.50 | 8 | 0.88 | 15 |
| 6" | 11.00 | 1.00 | 8.50 | 1.56 | 7.56 | 6.07 | 6.72 | 1.06 | 9.50 | 8 | 0.88 | 19 |
| 8" | 13.50 | 1.13 | 10.63 | 1.75 | 9.69 | 7.98 | 8.72 | 1.25 | 11.75 | 8 | 0.88 | 30 |
| 10" | 16.00 | 1.19 | 12.75 | 1.94 | 12.00 | 10.02 | 10.88 | 1.31 | 14.25 | 12 | 1.00 | 43 |
| 12" | 19.00 | 1.25 | 15.00 | 2.19 | 14.38 | 12.00 | 12.88 | 1.56 | 17.00 | 12 | 1.00 | 64 |
| 14" | 21.00 | 1.38 | 16.25 | 2.25 | 15.75 | 13.25 | 14.14 | 1.63 | 18.75 | 12 | 1.13 | 90 |
| 16" | 23.50 | 1.44 | 18.50 | 2.50 | 18.00 | 15.25 | 16.16 | 1.75 | 21.25 | 16 | 1.13 | 98 |
| 18" | 25.00 | 1.56 | 21.00 | 2.69 | 19.88 | 17.25 | 18.18 | 1.94 | 22.75 | 16 | 1.25 | 130 |
| 20" | 27.50 | 1.69 | 23.00 | 2.88 | 22.00 | 19.25 | 20.20 | 2.13 | 25.00 | 20 | 1.25 | 165 |
| 22" | 29.50 | 1.81 | 25.25 | 3.13 | 24.25 | 21.25 | 22.22 | 2.38 | 27.25 | 20 | 1.38 | 185 |
| 24" | 32.00 | 1.88 | 27.25 | 3.25 | 26.13 | 23.25 | 24.25 | 2.50 | 29.50 | 20 | 1.38 | 220 |
Bore matches the pipe ID, eliminating pockets that cause turbulence or corrosion.
Superior fatigue strength compared to slip-on flanges, ideal for hydraulic systems.
Fillet weld on the hub means no weld metal enters the bore of the pipe.