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Socket Weld Flange

Threaded Flange

Socket Weld Flange (SWRF)

AK Steel (India) is a trusted manufacturer and stockist of high-pressure Socket Weld Flanges, designed for small-bore piping systems where high flow efficiency and leak-proof joints are critical. These flanges feature a recessed area (counter-bore) that accepts the pipe, allowing for easy alignment and a strong fillet weld on the outside. We manufacture these flanges in a robust range of materials, specializing in Stainless Steel (304, 316, 310) for corrosive environments, High Pressure Alloy Steel for steam/power plants, and Mild Steel (Carbon Steel) for general industrial infrastructure.

The Socket Weld design eliminates the need for internal tack welding and ensures smooth fluid flow by matching the bore of the flange to the bore of the pipe. As an ISO 9001:2015 certified company, AK Steel (India) ensures that every flange meets strict dimensional tolerances defined by ASME B16.5. From hydraulic lines to chemical processing, our flanges are tested for high-pressure durability and are supplied with complete documentation, including EN 10204 3.1 Material Test Certificates (MTC).

  • Design: Socket Weld Raised Face (SWRF), Flat Face (SWFF).
  • Materials: SS 304/316, Alloy F11/F22, Mild Steel A105.
  • Standards: ASME B16.5, ASME B16.47, DIN 2527, JIS.
  • Pressure Class: 150#, 300#, 600#, 900#, 1500#, 2500#.
  • Application: High Pressure & Small Diameter Piping.
  • Size Range: 1/2" to 4" (DN15 to DN100).

Specification table of Socket Weld Flanges

Product Name
Socket Weld Flange (SWRF)
Stainless Steel
ASTM A182 F: 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 347, 904L
Alloy Steel
ASTM A182 F: F1, F5, F9, F11, F22, F91
(Ideal for High Temperature Steam & Oil Lines)
Mild / Carbon Steel
Standard: ASTM A105 / A105N
Low Temp: ASTM A350 LF2, LF3
High Yield: ASTM A694 F42, F52, F60, F65, F70
Duplex & Exotic
Duplex 2205 (F51), Super Duplex 2507 (F53), Inconel 600/625, Monel 400, Hastelloy C276, Titanium
Standards
ASME B16.5, BS 10 (Table D, E, F, H), DIN, EN 1092-1
Size Range
1/2" (15 NB) to 4" (100 NB)
(Socket Weld is primarily used for small bore piping)
Pressure Class
150#, 300#, 600#, 900#, 1500#, 2500#
Face Type
Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ)

Flange Weights by Pressure Class and Size in mm kg

Pipe Size (inch) 150 # 300 # 600 # 900 # 1500 # 2500 #
WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD WN SO BLD
1/2″ 2 1 1 2 1 1 2 2 2 SEE 1500 # WEIGHTS 5 4 4 7 7 7
3/4″ 2 2 2 3 3 3 4 3 3 SEE 1500 # WEIGHTS 6 5 6 8 8 8
1″ 3 2 2 4 3 3 4 4 4 SEE 1500 # WEIGHTS 9 8 8 12 11 11
1 1/2″ 4 3 3 7 6 6 8 7 8 SEE 1500 # WEIGHTS 13 12 13 25 22 23
2″ 6 5 5 9 7 8 12 9 10 SEE 1500 # WEIGHTS 25 25 25 42 37 39
2 1/2″ 8 7 7 12 10 12 18 13 15 SEE 1500 # WEIGHTS 36 36 35 52 55 56
3″ 10 8 9 15 13 16 23 16 20 31 26 29 48 48 48 94 83 86
4″ 15 13 17 25 22 27 42 37 41 53 53 54 73 73 73 145 125 130
5″ 19 15 20 32 28 35 68 63 68 86 83 87 130 130 140 245 210 225
6″ 24 19 26 42 39 50 81 80 86 110 110 115 165 165 160 380 325 345
8″ 39 30 45 67 58 81 120 115 140 175 170 200 275 260 300 580 485 530
10″ 52 43 70 91 81 124 190 170 230 260 245 290 455 435 510 1075 930 1025
12″ 80 64 110 140 115 185 225 200 295 325 325 415 690 580 690 1525 1100 1300
14″ 110 90 140 180 165 250 280 230 355 400 400 520 940 NA 975 NA NA NA
16″ 140 98 180 250 190 295 390 330 495 495 425 600 1250 NA 1300 NA NA NA
18″ 150 130 220 320 250 395 475 400 630 680 600 850 1625 NA 1750 NA NA NA
20″ 180 165 285 400 315 505 590 510 810 830 730 1075 2050 NA 2225 NA NA NA
22″ 225 185 355 465 370 640 720 590 1000 NA NA NA NA NA NA NA NA NA
24″ 260 220 430 580 475 790 830 730 1250 1500 1400 2025 3325 NA 3625 NA NA NA