Socket Weld Flange
Socket Weld Flange
A Socket Weld Flange is a flange used to connect pipes to flanged fittings or other flanged equipment. It is designed with a socket, or recess, which allows the pipe to be inserted into the flange, providing a strong and leak-proof seal. The pipe is welded into the socket, ensuring a secure connection. Socket weld flanges are commonly used in high-pressure, high-temperature applications, such as in chemical, petroleum, and steam systems.
Materials
1. Carbon Steel
ASTM A105, A350 LF2
2. Stainless Steel
ASTM A182 F304, F304L, F316, F316L
3. Alloy Steel
ASTM A182 F11, F22, F91
4. Duplex & Super Duplex Stainless Steel
ASTM A182 F51, F53, F55
5. Nickel Alloys
Inconel (Alloy 625, 825), Monel (400, K500)
7. Titanium
ASTM B381 Grade 2, Grade 5
Socket Weld Flange Dimension Chart
Class 150 Socket Neck Flange Dimensions
Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 90 9.6 30 14 34.9 2 10 60.3 22.2 4 1/2 50 55 5/8 M14 0.8
3/4 20 100 11.2 38 14 42.9 2 11 69.9 27.7 4 1/2 50 65 5/8 M14 0.9
1 25 110 12.7 49 16 50.8 2 13 79.4 34.5 4 1/2 55 65 5/8 M14 0.9
1 1/4 32 115 14.3 59 19 63.5 2 14 88.9 43.2 4 1/2 55 70 5/8 M14 1.4
1 1/2 40 125 15.9 65 21 73 2 16 98.4 49.5 4 1/2 65 70 5/8 M14 1.4
2 50 150 17.5 78 24 92.1 2 17 120.7 61.9 4 5/8 70 85 3/4 M16 2.3
2 1/2 65 180 20.7 90 27 105 2 19 139.7 74.6 4 5/8 75 90 3/4 M16 3.2
3 80 190 22.3 108 29 127 2 21 152.4 90.7 4 5/8 75 90 3/4 M16 3.7
Class 300 Socket Neck Flange Dimensions
Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 95 12.7 38 21 34.9 2 10 66.7 22.2 4 1/2 55 65 5/8 M14 1.2
3/4 20 115 14.3 48 24 42.9 2 11 82.6 27.7 4 5/8 65 75 3/4 M16 1.4
1 25 125 15.9 54 25 50.8 2 13 88.9 34.5 4 5/8 65 75 3/4 M16 1.4
1 1/4 32 135 17.5 64 25 63.5 2 14 98.4 43.2 4 5/8 70 85 3/4 M16 1.8
1 1/2 40 155 19.1 70 29 73 2 16 114.3 49.5 4 3/4 75 90 7/8 M20 2.7
2 50 165 20.7 84 32 92.1 2 17 127 61.9 8 5/8 75 90 3/4 M16 3.2
2 1/2 65 190 23.9 100 37 105 2 19 149.2 74.6 8 3/4 85 100 7/8 M20 4.6
3 80 210 27 117 41 127 2 21 168.3 90.7 8 3/4 90 110 7/8 M20 5.9
Class 600 Socket Neck Flange Dimensions
Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 95 14.3 38 22 34.9 7 10 66.7 22.2 4 1/2 75 5/8 M14 1.3
3/4 20 115 15.9 48 25 42.9 7 11 82.6 27.7 4 5/8 90 3/4 M16 1.4
1 25 125 17.5 54 27 50.8 7 13 88.9 34.5 4 5/8 90 3/4 M16 1.8
1 1/4 32 135 20.7 64 29 63.5 7 14 98.4 43.2 4 5/8 95 3/4 M16 2.3
1 1/2 40 155 22.3 70 32 73 7 16 114.3 49.5 4 3/4 110 7/8 M20 3.2
2 50 165 25.4 84 37 92.1 7 17 127 61.9 8 5/8 110 3/4 M16 4.1
2 1/2 65 190 28.6 100 41 105 7 19 149.2 74.6 8 3/4 120 7/8 M20 5.9
3 80 210 31.8 117 46 127 7 21 168.3 90.7 8 3/4 125 7/8 M20 7.3
Class 1500 Socket Neck Flange Dimensions
Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 120 22.3 38 32 34.9 7 10 82.6 22.2 4 3/4 110 7/8 M20 1.8
3/4 20 130 25.4 44 35 42.9 7 11 88.9 27.7 4 3/4 115 7/8 M20 2.3
1 25 150 28.6 52 41 50.8 7 13 101.6 34.5 4 7/8 125 1 M24 3.7
1 1/4 32 160 28.6 64 41 63.5 7 14 111.1 43.2 4 7/8 125 1 M24 4.1
1 1/2 40 180 31.8 70 44 73 7 16 123.8 49.5 4 1 140 1 1/8 M27 5.5
2 50 215 38.1 105 57 92.1 7 17 165.1 61.9 8 7/8 145 1 M24 9.8
2 1/2 65 245 41.3 124 64 105 7 19 190.5 74.6 8 1 160 1 1/8 M27 16.4
3 80 265 47.7 133 N/A 127 7 203.2 N/A 8 1 1/8 180 1 1/4 M30 21.8
Socket Weld Flange Weight Chart
| Nominal Pipe Size (NPS) | Class 150 (lbs) | Class 300 (lbs) | Class 400 (lbs) | Class 600 (lbs) | Class 900 (lbs) | Class 1500 (lbs) | Class 2500 (lbs) |
|---|---|---|---|---|---|---|---|
| 1/2″ | 0.5 | 1.0 | 1.1 | 1.3 | 2.0 | 2.5 | 3.0 |
| 3/4″ | 0.7 | 1.3 | 1.4 | 1.6 | 2.5 | 3.0 | 3.8 |
| 1″ | 0.9 | 1.6 | 1.8 | 2.1 | 3.5 | 4.5 | 5.6 |
| 1-1/2″ | 1.4 | 2.8 | 3.0 | 3.8 | 5.8 | 7.8 | 9.5 |
| 2″ | 2.0 | 4.2 | 4.5 | 5.3 | 8.0 | 11.0 | 14.0 |
| 3″ | 3.8 | 8.5 | 9.0 | 11.0 | 15.5 | 23.0 | 32.0 |
| 4″ | 5.7 | 13.0 | 14.0 | 17.0 | 24.5 | 37.0 | 48.0 |
| 6″ | 9.5 | 27.0 | 29.0 | 33.0 | 47.0 | 72.0 | 95.0 |
| 8″ | 15.5 | 42.0 | 45.0 | 55.0 | 78.0 | 120.0 | 155.0 |
| 10″ | 22.0 | 65.0 | 70.0 | 85.0 | 120.0 | 180.0 | 240.0 |
| 12″ | 31.0 | 92.0 | 100.0 | 125.0 | 175.0 | 265.0 | 365.0 |
Common Outer Diameters (OD)
Socket Weld Flanges are available in various outer diameters, typically aligning with standard pipe sizes. Common ODs include:
- ½ inch to 4 inches (Small Bore)
- 6 inches to 24 inches (Medium to Large Bore, as required)
Custom sizes can also be fabricated depending on project specifications.
Pressure Class Range
- Class 150
- Class 300
- Class 600
- Class 900
- Class 1500
- Class 2500
Flange Face Types
- Raised Face (RF):
- Most common face type for Socket Weld Flanges.
- Enhances gasket performance.
- Flat Face (FF):
- Suitable for low-pressure applications.
- Used when bolting to cast iron or other flat face flanges.
- Ring Type Joint (RTJ):
- Ideal for high-pressure and high-temperature applications.
- Features a precision-machined groove for metallic gaskets.
