Socket Weld Fittings
What are Socket Weld Fittings?
Socket Weld Fittings are high-pressure pipe connection components where a pipe is inserted into a recessed socket and then welded around the outer edge. This design provides strong, leak-proof joints, especially in small-bore piping systems handling high-pressure steam, fluids, or gases. These fittings are widely used in power plants, oil refineries, chemical processing, and shipbuilding applications where compact, rigid, and reliable connections are essential.
Manufactured in various types like elbows, tees, couplings, reducers, and unions, socket weld fittings conform to ASME B16.11 and are made from carbon steel, stainless steel, and alloy steel for durability under pressure.
Key Features
- Leak-Proof Design – The welded joint ensures no leakage under pressure or vibration.
- Strong Connection – High structural integrity suitable for vibration-prone systems.
- Space-Saving – Compact dimensions ideal for tight or small-area installations.
- Material Versatility – Available in CS, SS, Duplex, and high-temp alloys.
- Standard Compliance – Adheres to ASME B16.11, MSS-SP, and DIN standards.
Types of Fasteners
- Socket Weld Elbows (45° & 90°)
- Socket Weld Tees
- Socket Weld Couplings (Full & Half)
- Socket Weld Unions
- Socket Weld Crosses
- Socket Weld Reducers
- Socket Weld Caps
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½" to 4" (DN15 to DN100) |
| Pressure Ratings | Class 3000 / 6000 / 9000 |
| Material Options | ASTM A105 (CS), A182 F304/316 (SS), A350 LF2 |
| Standards | ASME B16.11, MSS-SP-79 / 83 / 95 |
| End Type | Socket Weld (SW) |
| Property | Value (Typical) |
|---|---|
| Tensile Strength | 485 – 700 MPa |
| Yield Strength | 250 – 450 MPa |
| Elongation | 20% – 30% |
| Temperature Range | -46°C to +600°C |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.35 |
| Manganese (Mn) | 0.60 – 1.65 |
| Silicon (Si) | 0.15 – 0.80 |
| Chromium (Cr) | 18.0 – 20.0 (SS only) |
| Nickel (Ni) | 8.0 – 10.5 (SS only) |
| Molybdenum (Mo) | 2.0 – 3.0 (for F316) |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A105, A182 F304/316, A350 LF2 |
| ASME | B16.11 |
| MSS-SP | SP-79, SP-83, SP-95 |
| DIN | 2950, 2975 |
| Fitting Type | Size (inches) | Weight per 100 pcs (kg) |
|---|---|---|
| 90° Elbow | 1" | 12.00 |
| Tee | ¾" | 10.50 |
| Full Coupling | 1¼" | 13.80 |
| Union | 2" | 18.20 |
| Cap | 1½" | 9.50 |
Applications of Socket Weld Fittings
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
What is the difference between socket weld and butt weld fittings?
Socket weld fittings are used for smaller pipe sizes and involve inserting the pipe into a recessed socket before welding. Butt weld fittings join pipe ends directly and are suitable for larger diameters.
Are socket weld fittings suitable for corrosive applications?
Yes, when made from stainless steel (e.g., SS 316), socket weld fittings can perform well in corrosive or mildly aggressive fluid systems.
Do you offer socket weld fittings with NACE or IBR certifications?
Yes, we provide NACE MR0175, IBR-approved, and third-party inspected socket weld fittings upon request.
What pressure classes are available?
We supply Class 3000, 6000, and 9000 socket weld fittings based on your pressure system design.
