Socket
What is a Socket?
A Socket —also known as a Socket Weld Coupling—is a high-pressure pipe fitting used to connect two pipes in a straight line using a socket-based welding method. One end of each pipe is inserted into the coupling’s socket, and a fillet weld is applied around the outer circumference. This creates a strong, leak-tight, and compact connection, ideal for systems where pipe alignment and vibration resistance are critical.
Socket weld sockets are widely used in small-diameter piping systems (up to 4″) handling high-pressure steam, oil, gas, and corrosive chemicals in refineries, power plants, petrochemical units, and shipbuilding.
Key Features
- Reliable Pipe Connection – Joins two straight pipes with a seamless welded bond.
- Ideal for High-Pressure Systems – Designed for Class 3000, 6000, and 9000 use.
- Tight Pipe Fitment – Internal stop ensures proper pipe insertion depth.
- Compact Structure – Suitable for space-limited pipeline layouts.
- Available in Multiple Grades – Carbon steel, stainless steel, and special alloys.
Types of Socket Weld Couplings
- Full Coupling (Both Ends Socket Weld)
- Half Coupling (One End Socket Weld, One Plain End)
- Reducing Coupling
- Custom-Length Socket Weld Coupling
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Details |
|---|---|
| Sizes | ½" to 4" (DN15 – DN100) |
| Pressure Ratings | Class 3000 / 6000 / 9000 |
| Material Options | ASTM A105 (Carbon Steel), A182 F304/F316 (SS) |
| Standards | ASME B16.11, MSS-SP-83 |
| End Connection | Socket Weld |
| Property | Typical Value |
|---|---|
| Tensile Strength | 485 – 700 MPa |
| Yield Strength | 250 – 450 MPa |
| Elongation | 20% – 30% |
| Operating Temp 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 316) |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A105, A182 F304 / F316, A350 LF2 |
| ASME | B16.11 |
| MSS-SP | SP-79, SP-83 |
| DIN | 2950, 2975 |
| Coupling Type | Size (inches) | Weight per 100 pcs (kg) |
|---|---|---|
| Full Coupling | ½" | 7.50 |
| Full Coupling | 1" | 11.80 |
| Half Coupling | ¾" | 6.90 |
| Reducing Coupling | 1½" | 14.60 |
| Full Coupling | 2" | 18.90 |
Applications of Socket Weld Sockets
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
Socket weld elbows offer better structural strength and leak protection, especially under high pressure or vibration conditions.
