Kwality Steel (India)
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Socket Weld Flanges

Certified steel products, dependable supply and application-focused support for industrial buyers.

Socket Weld Flanges

Socket weld flanges are used for small-bore high-pressure systems where pipe insertion and fillet welding create a compact joint. They are common in hydraulic, steam, chemical and instrumentation lines where leakage control and joint strength are important. Our socket weld flanges are supplied with accurate socket dimensions and grade-specific certification.

Size Range1/2 inch to 4 inch
Wall / Pressure ClassClass 150 to 1500
TypesRaised Face, Flat Face, RTJ Socket Weld
StandardsASME B16.5, BS 3799
FinishMachined, Serrated, Coated
LengthSocket depth as standard

Materials Grades

Available in corrosion-resistant, high-temperature and pressure-grade materials for industrial service. Grade selection can be aligned with pressure, temperature, corrosion allowance and client specification.

Stainless Steel 304/304LStainless Steel 316/316LCarbon SteelAlloy SteelDuplex 2205Super Duplex 2507InconelMonelHastelloyTitanium

Dimensions Chart

Use this chart for OD, bolt circle, hole pattern and flange thickness reference. Socket depth changes by size and class.

ASME B16.5 Slip On Flange Drawing

Socket Weld Flanges Dimensions Chart

NPS (Nominal Pipe Size)
 Outside Diameter (O.D.) Thickness of Flange Diameter of Raised Face Diameter of Hub at Base Thru Hub Length Diameter of Bore Socket Depth Number of Holes Diameter of Holes Approx. Weight Pounds/Kilogram
O C R X Y B D
1/2″ in. 3.5 0.44 1.38 1.19 0.62 0.88 0.38 4 0.62 1
mm. 88.9 11.2 35.1 30.2 15.7 22.4 9.7 15.7 0.5
3/4″ in. 3.88 0.5 1.69 1.5 0.62 1.09 0.44 4 0.62 2
mm. 98.6 12.7 42.9 38.1 15.7 27.7 11.2 15.7 1
1″ in. 4.25 0.56 2 1.94 0.69 1.36 0.5 4 0.62 2
mm. 108 14.2 50.8 49.3 17.5 34.5 12.7 15.7 1
1 1/4″ in. 4.62 0.62 2.5 2.31 0.81 1.7 0.56 4 0.62 3
mm. 117.3 15.7 63.5 58.7 20.6 43.2 14.2 15.7 1
1 1/2″ in. 5 0.69 2.88 2.56 0.88 1.95 0.62 4 0.62 3
mm. 127 17.5 73.2 65 22.4 49.5 15.7 15.7 1
2″ in. 6 0.75 3.62 3.06 1 2.44 0.69 4 0.75 5
mm. 152.4 19.1 91.9 77.7 25.4 62 17.5 19.1 2
2 1/2″ in. 7 0.88 4.12 3.56 1.12 2.94 0.75 4 0.75 7
mm. 177.8 22.4 104.6 90.4 28.4 74.7 19.1 19.1 3
3″ in. 7.5 0.94 5 4.25 1.19 3.57 0.81 4 0.75 8
mm. 190.5 23.9 127 108 30.2 90.7 20.6 19.1 4
3 1/2″ in. 8.5 0.94 5.5 4.81 1.25 4.07 8 0.75 11
mm. 215.9 23.9 139.7 122.2 31.8 103.4 19.1 5
4″ in. 9 0.94 6.19 5.31 1.31 4.57 8 0.75 13
mm. 228.6 23.9 157.2 134.9 33.3 116.1 19.1 6
5″ in. 10 0.94 7.31 6.44 1.44 5.66 8 0.88 15
mm. 254 23.9 185.7 163.6 36.6 143.8 22.4 7
6″ in. 11 1 8.5 7.56 1.56 6.72 8 0.88 19
mm. 279.4 25.4 215.9 192 39.6 170.7 22.4 9
8″ in. 13.5 1.12 10.62 9.69 1.75 8.72 8 0.88 30
mm. 342.9 28.4 269.7 246.1 44.5 221.5 22.4 14
10″ in. 16 1.19 12.75 12 1.94 10.88 12 1 43
mm. 406.4 30.2 323.9 304.8 49.3 276.4 25.4 20
12″ in. 19 1.25 15 14.38 2.19 12.88 12 1 64
mm. 482.6 31.8 381 365.3 55.6 327.2 25.4 29
14″ in. 21 1.38 16.25 15.75 2.25 14.14 12 1.12 90
mm. 533.4 35.1 412.8 400.1 57.2 359.2 28.4 41
16″ in. 23.5 1.44 18.5 18 2.5 16.16 16 1.12 98
mm. 596.9 36.6 469.9 457.2 63.5 410.5 28.4 44
18″ in. 25 1.56 21 19.88 2.69 18.18 16 1.25 130
mm. 635 39.6 533.4 505 68.3 461.8 31.8 59
20″ in. 27.5 1.69 23 22 2.88 20.2 20 1.25 165
mm. 698.5 42.9 584.2 558.8 73.2 513.1 31.8 75
24″ in. 32 1.88 27.25 26.12 3.25 24.25 20 1.38 220
mm. 812.8 47.8 692.2 663.4 82.6 616 35.1 100

Class 300 Socket Weld Flange Dimensions

Nominal Pipe Size (NPS) Outside Diameter (O.D>) Thickness of Flange Diameter of Raised Face (RF) Diameter of Hub at Base Thru Hub Length Diameter of Bore Socket Depth Number of Holes Diameter of Holes Approx. Weight Pounds/ Kilogram
O C R X Y B D
1/2″ in. 3.75 0.56 1.38 1.5 0.88 0.88 0.38 4 0.62 2
mm. 95.3 14.2 35.1 38.1 22.4 22.4 9.7 15.7 1
3/4″ in. 4.62 0.62 1.69 1.88 1 1.09 0.44 4 0.75 3
mm. 117.3 15.7 42.9 47.8 25.4 27.7 11.2 19.1 1
1″ in. 4.88 0.69 2 2.12 1.06 1.36 0.5 4 0.75 3
mm. 124 17.5 50.8 53.8 26.9 34.5 12.7 19.1 1
1 1/4″ in. 5.25 0.75 2.5 2.5 1.06 1.7 0.56 4 0.75 4
mm. 133.4 19.1 63.5 63.5 26.9 43.2 14.2 19.1 2
1 1/2″ in. 6.12 0.81 2.88 2.75 1.19 1.95 0.62 4 0.88 6
mm. 155.4 20.6 73.2 69.9 30.2 49.5 15.7 22.4 3
2″ in. 6.5 0.88 3.62 3.31 1.31 2.44 0.69 8 0.75 7
mm. 165.1 22.4 91.9 84.1 33.3 62 17.5 19.1 3
2 1/2″ in. 7.5 1 4.12 3.94 1.5 2.94 0.75 8 0.88 10
mm. 190.5 25.4 104.6 100.1 38.1 74.7 19.1 22.4 5
3″ in. 8.25 1.12 5 4.62 1.69 3.57 0.81 8 0.88 13
mm. 209.6 28.4 127 117.3 42.9 90.7 20.6 22.4 6
3 1/2″ in. 9 1.19 5.5 5.25 1.75 4.07 8 0.88 17
mm. 228.6 30.2 139.7 133.4 44.5 103.4 22.4 8
4″ in. 10 1.25 6.19 5.75 1.88 4.57 8 0.88 22
mm. 254 31.8 157.2 146.1 47.8 116.1 22.4 10
5″ in. 11 1.38 7.31 7 2 5.66 8 0.88 28
mm. 279.4 35.1 185.7 177.8 50.8 143.8 22.4 13
6″ in. 12.5 1.44 8.5 8.12 2.06 6.72 12 0.88 39
mm. 317.5 36.6 215.9 206.2 52.3 170.7 22.4 18
8″ in. 15 1.62 10.62 10.25 2.44 8.72 12 1 58
mm. 381 41.1 269.7 260.4 62 221.5 25.4 26
10″ in. 17.5 1.88 12.75 12.62 2.62 10.88 16 1.12 81
mm. 444.5 47.8 323.9 320.5 66.5 276.4 28.4 37
12″ in. 20.5 2 15 14.75 2.88 12.88 16 1.25 115
mm. 520.7 50.8 381 374.7 73.2 327.2 31.8 52
14″ in. 23 2.12 16.25 16.75 3 14.14 20 1.25 165
mm. 584.2 53.8 412.8 425.5 76.2 359.2 31.8 75
16″ in. 25.5 2.25 18.5 19 3.25 16.16 20 1.38 190
mm. 647.7 57.2 469.9 482.6 82.6 410.5 35.1 86
18″ in. 28 2.38 21 21 3.5 18.18 24 1.38 250
mm. 711.2 60.5 533.4 533.4 88.9 461.8 35.1 113
20″ in. 30.5 2.5 23 23.12 3.75 20.2 24 1.38 315
mm. 774.7 63.5 584.2 587.2 95.3 513.1 35.1 143
24″ in. 36 2.75 27.25 27.62 4.19 24.25 24 1.62 475
mm. 914.4 69.9 692.2 701.5 106.4 616 41.1 215

Class 600 Socket Weld Flange Dimensions

Nominal Pipe Size (NPS) Outside Diameter (O.D) Thickness of Flange Diameter of Raised Face (RF) Diameter of Hub at Base Thru Hub Length Diameter of Bore Socket Depth Number of Holes Diameter of Holes Approx. Weight Pounds/ Kilogram
O C R X Y B D
1/2″ in. 3.75 0.56 1.38 1.5 0.88 0.88 0.38 4 0.62 2
mm. 95.3 14.2 35.1 38.1 22.4 22.4 9.7 15.7 1
3/4″ in. 4.62 0.62 1.69 1.88 1 1.09 0.44 4 0.75 3
mm. 117.3 15.7 42.9 47.8 25.4 27.7 11.2 19.1 1
1″ in. 4.88 0.69 2 2.12 1.06 1.36 0.5 4 0.75 4
mm. 124 17.5 50.8 53.8 26.9 34.5 12.7 19.1 2
1 1/4″ in. 5.25 0.81 2.5 2.5 1.12 1.7 0.56 4 0.75 5
mm. 133.4 20.6 63.5 63.5 28.4 43.2 14.2 19.1 2
1 1/2″ in. 6.12 0.88 2.88 2.75 1.25 1.95 0.62 4 0.88 7
mm. 155.4 22.4 73.2 69.9 31.8 49.5 15.7 22.4 3
2″ in. 6.5 1 3.62 3.31 1.44 2.44 0.69 8 0.75 9
mm. 165.1 25.4 91.9 84.1 36.6 62 17.5 19.1 4
2 1/2″ in. 7.5 1.12 4.12 3.94 1.62 2.94 0.75 8 0.88 13
mm. 190.5 28.4 104.6 100.1 41.1 74.7 19.1 22.4 6
3″ in. 8.25 1.25 5 4.62 1.81 3.57 0.81 8 0.88 16
mm. 209.6 31.8 127 117.3 46 90.7 20.6 22.4 7
3 1/2″ in. 9 1.38 5.5 5.25 1.94 4.07 8 1 21
mm. 228.6 35.1 139.7 133.4 49.3 103.4 25.4 10
4″ in. 10.75 1.5 6.19 6 2.12 4.57 8 1 37
mm. 273.1 38.1 157.2 152.4 53.8 116.1 25.4 17
5″ in. 13 1.75 7.31 7.44 2.38 5.66 8 1.12 63
mm. 330.2 44.5 185.7 189 60.5 143.8 28.4 29
6″ in. 14 1.88 8.5 8.75 2.62 6.72 12 1.12 80
mm. 355.6 47.8 215.9 222.3 66.5 170.7 28.4 36
8″ in. 16.5 2.19 10.62 10.75 3 8.72 12 1.25 115
mm. 419.1 55.6 269.7 273.1 76.2 221.5 31.8 52
10″ in. 20 2.5 12.75 13.5 3.38 10.88 16 1.38 170
mm. 508 63.5 323.9 342.9 85.9 276.4 35.1 77
12″ in. 22 2.62 15 15.75 3.62 12.88 20 1.38 200
mm. 558.8 66.5 381 400.1 91.9 327.2 35.1 91
14″ in. 23.75 2.75 16.25 17 3.69 14.14 20 1.5 230
mm. 603.3 69.9 412.8 431.8 93.7 359.2 38.1 104
16″ in. 27 3 18.5 19.5 4.19 16.16 20 1.62 330
mm. 685.8 76.2 469.9 495.3 106.4 410.5 41.1 150
18″ in. 29.25 3.25 21 21.5 4.62 18.18 20 1.75 400
mm. 743 82.6 533.4 546.1 117.3 461.8 44.5 181
20″ in. 32 3.5 23 24 5 20.2 24 1.75 510
mm. 812.8 88.9 584.2 609.6 127 513.1 44.5 231
24″ in. 37 4 27.25 28.25 5.5 24.25 24 2 730
mm. 939.8 101.6 692.2 717.6 139.7 616 50.8 331

Class 1500 Socket Weld Flange Dimension

Nominal Pipe Size (NPS) Outside Diameter (O.D) Thickness of Flange Diameter of Raised Face (RF) Diameter of Hub at Base Thru Hub Length Diameter of Bore Socket Depth Number of Holes Diameter of Holes Approx. Weight Pounds/ Kilogram
O C R X Y B D
1/2″ in. 4.75 0.88 1.38 1.5 1.25 0.88 0.38 4 0.88 4
mm. 120.7 22.4 35.1 38.1 31.8 22.4 9.7 22.4 2
3/4″ in. 5.12 1 1.69 1.75 1.38 1.09 0.44 4 0.88 5
mm. 130 25.4 42.9 44.5 35.1 27.7 11.2 22.4 2
1″ in. 5.88 1.12 2 2.06 1.62 1.36 0.5 4 1 8
mm. 149.4 28.4 50.8 52.3 41.1 34.5 12.7 25.4 4
1 1/4″ in. 6.25 1.12 2.5 2.5 1.62 1.7 0.56 4 1 9
mm. 158.8 28.4 63.5 63.5 41.1 43.2 14.2 25.4 4
1 1/2″ in. 7 1.25 2.88 2.75 1.75 1.95 0.62 4 1.12 12
mm. 177.8 31.8 73.2 69.9 44.5 49.5 15.7 28.4 5
2″ in. 8.5 1.5 3.62 4.12 2.25 2.44 0.69 8 1 25
mm. 215.9 38.1 91.9 104.6 57.2 62 17.5 25.4 11
2 1/2″ in. 9. 2 1. 2 4. 2 4. 8 2.5 2. 4 0. 5 8 1. 2 36
mm. 244.3 41.1 104.6 124 63.5 74.7 19.1 28.4 16
3″ in. 10.5 1.88 5 5.25 2.88 8 1.25 48
mm. 266.7 47.8 127 133.4 73.2 31.8 22
4″ in. 12.25 2.12 6.19 6.38 3.56 8 1.38 73
mm. 311.2 53.8 157.2 162.1 90.4 35.1 33
5″ in. 14.75 2.88 7.31 7.75 4.12 8 1.62 130
mm. 374.7 73.2 185.7 196.9 104.6 41.1 59
6″ in. 15.5 3.25 8.5 9 4.69 12 1.5 165
mm. 393.7 82.6 215.9 228.6 119.1 38.1 75
8″ in. 19 3.62 10.62 11.5 5.62 12 1.75 260
mm. 482.6 91.9 269.7 292.1 142.7 44.5 118
10″ in. 23 4.25 12.75 14.5 6.25 12 2 435
mm. 584.2 108 323.9 368.3 158.8 50.8 197
12″ in. 26.5 4.88 15 17.75 7.12 16 2.12 580
mm. 673.1 124 381 450.9 180.8 53.8 263
14″ in. 29.5 5.25 16.25 19.5 16 2.38
mm. 749.3 133.4 412.8 495.3 60.5
16″ in. 32.5 5.75 18.5 21.75 16 2.62
mm. 825.5 146.1 469.9 552.5 66.5
18″ in. 36 6.38 21 23.5 16 2.88
mm. 914.4 162.1 533.4 596.9 73.2
20″ in. 38.75 7 23 25.25 16 3.12
mm. 984.3 177.8 584.2 641.4 79.2
24″ in. 46 8 27.25 30 16 3.62
mm. 1168.4 203.2 692.2 762 91.9

Class 2500 Socket Weld Flange Dimension

Normal Pipe Diameter (NPS) Ouside Daimeter (O.D.) Flange  Thickness Of Flange Min  Daimeter
of
Hub 		 Diameter of Raised Face  Hub
Daimeter
Chamfer
of W.N 		 Length Hub.Y Bore  Circle Bolt Daimeter
> 		Bolt Holes Daimeter
 Bolts Number Daimeter of
Bolts
(inches)		 Kilogram LB
inch dn O C X G A Y B BC BH BN BD
1/2″ 15 89.00 11.20 30.20 35.10 21.30 47.80 15.80 60.50 15.80 4 1/2″ 0.7 1.5
3/4″ 20 98.50 12.70 38.10 42.90 26.70 52.30 20.80 69.90 15.80 4 1/2″ 0.8 1.8
1″ 25 108.00 14.20 49.30 50.80 33.50 55.60 26.70 79.30 15.80 4 1/2″ 1.1 2.4
1-1/4″ 32 117.50 15.70 58.70 63.50 42.20 57.20 35.10 88.90 15.80 4 1/2″ 1.5 3.3
1-1/2″ 40 127.00 17.50 65.00 73.20 48.30 62.00 40.90 98.60 15.80 4 1/2″ 1.8 4
2″ 50 152.50 19.10 77.70 91.90 60.50 63.50 52.60 120.70 19.10 4 5/8″ 2.7 6
2-1/2″ 65 178.00 22.40 90.40 104.60 73.20 69.90 62.70 139.70 19.10 4 5/8″ 4.4 9.8
3″ 80 190.50 23.90 108.00 127.00 88.90 69.90 78.00 152.40 19.10 4 5/8″ 5.2 11.5
3-1/2″ 90 216.00 23.90 122.20 139.70 101.60 71.40 90.20 177.80 19.10 8 5/8″ 6.4 14.2
4″ 100 228.50 23.90 134.90 157.20 114.30 76.20 102.40 190.50 19.10 8 5/8″ 7.5 16.6
5″ 125 254.00 23.90 163.60 185.70 141.20 88.90 128.30 215.90 22.40 8 3/4″ 9.2 20.2
6″ 150 279.50 25.40 192.00 215.90 168.40 88.90 154.20 241.30 22.40 8 3/4″ 11 24.3
8″ 200 343.00 28.40 246.10 269.70 219.20 101.60 202.70 298.50 22.40 8 3/4″ 18.4 40.6
10″ 250 406.50 30.20 304.80 323.90 273.10 101.60 254.50 362.00 25.40 12 7/8″ 25.5 56.2
12″ 300 482.50 31.80 365.30 381.00 323.90 114.30 304.80 431.80 25.40 12 7/8″ 37 81.4
14″ 350 533.50 35.10 400.10 412.80 355.60 127.00 476.30 28.50 12 1″ 51 113
16″ 400 597.00 36.60 457.20 469.90 406.40 127.00 539.80 28.50 16 1″ 61.5 136
18″ 450 635.00 39.60 505.00 533.40 457.20 139.70 577.90 31.80 16 1 1/8″ 71.5 158
20″ 500 698.50 42.90 558.80 584.20 508.00 144.50 635.00 31.80 20 1 1/8″ 85 187
24″ 600 813.00 47.80 663.40 692.20 609.60 152.40 749.30 35.10 20 1 1/4″ 119 262

Applications

Oil & Gas

Reliable performance for demanding fabrication, maintenance and process piping needs.

Petrochemical

Reliable performance for demanding fabrication, maintenance and process piping needs.

Power & Energy

Reliable performance for demanding fabrication, maintenance and process piping needs.

Marine

Reliable performance for demanding fabrication, maintenance and process piping needs.

Chemical

Reliable performance for demanding fabrication, maintenance and process piping needs.

Construction

Reliable performance for demanding fabrication, maintenance and process piping needs.

Kwality Steel (India)