OEM manufacturer ASME B16.11
Socket Weld Full & Half Couplings — ASME B16.11
A socket weld coupling joins two small-bore pipes in line; a half coupling has a socket on one end only and is welded onto a pipe or vessel as a branch. Teshi Group manufactures socket weld full and half couplings to ASME B16.11 in Class 3000 and 6000, in carbon, low-temperature, alloy and stainless steels.
Also called: SW full coupling, SW half coupling, socket weld half coupling, forged coupling, socket welding coupling
What is a Socket Weld Coupling?
A full coupling is a short forged sleeve with a socket at each end and a small central stop. Two pipes of the same size are inserted from either side and fillet welded. A half coupling has a socket at one end and a plain end that is welded to the outside of a larger pipe or vessel to create a branch for a small-bore line, instrument or drain. Both are standard items in small-bore piping and pressure vessel nozzles.
Key features
- Full and half couplings per ASME B16.11
- Class 3000 and 6000
- Half couplings used as branch connections on pipes and vessels
- Machined sockets with controlled depth and centre stop
Specification
| Supply | OEM manufacturer — Teshi Group, India |
|---|---|
| Standard | ASME B16.11 |
| Types | Full coupling, half coupling |
| Pressure class | Class 3000 and 6000 |
| Pipe compatibility | Class 3000 → Sch 80, Class 6000 → Sch 160 pipe |
| Size range | Class 3000: NPS ⅛"–4"; Class 6000: NPS ⅛"–2" (per ASME B16.11) |
| Materials — carbon steel | ASTM A105 / A105N; ASTM A181 Cl 60, Cl 70; ASTM A266 Gr 2, Gr 4 (large forgings) |
| Materials — high-yield carbon steel | ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 (MSS SP-44 grades F52–F70) |
| Materials — low-temperature carbon steel | ASTM A350 LF1, LF2 Cl 1, LF2 Cl 2, LF3, LF6, LF9 |
| Materials — alloy steel (Cr-Mo) | ASTM A182 F1, F2, F5, F5a, F9, F11 Cl 1 / 2 / 3, F12 Cl 1 / 2, F21, F22 Cl 1 / 3, F22V, F91, F92, F911; ASTM A336 F11, F22 (large forgings) |
| Materials — stainless steel | ASTM A182 F304, F304L, F304H, F304LN, F309H, F310, F316, F316L, F316H, F316LN, F316Ti, F317, F317L, F321, F321H, F347, F347H, F348 |
| Materials — 904L and 6Mo | 904L (ASTM A182 F904L, UNS N08904); 254 SMO / 6Mo (ASTM A182 F44, UNS S31254); AL-6XN (ASTM A182 F62, UNS N08367) |
| Materials — duplex stainless steel | ASTM A182 F51 (UNS S31803), F60 (UNS S32205, 2205) |
| Materials — super duplex stainless steel | ASTM A182 F53 (UNS S32750, 2507), F55 (UNS S32760), F61 (UNS S32550) |
| Materials — nickel alloys | ASTM B564 / B160 / B462: Nickel 200 / 201 (N02200 / N02201), Monel 400 (N04400), Monel K-500 (N05500), Inconel 600 (N06600), Inconel 625 (N06625), Inconel 718 (N07718), Incoloy 800 / 800H / 800HT (N08800 / N08810 / N08811), Incoloy 825 (N08825), Hastelloy C276 (N10276), Hastelloy C22 (N06022), Hastelloy B2 / B3 (N10665 / N10675), Alloy 20 (N08020) |
| Materials — titanium | ASTM B381 Grade F1, F2, F5 (Ti-6Al-4V), F7, F12 |
| Materials — copper-nickel | Cu-Ni 90/10 (UNS C70600) and 70/30 (UNS C71500), ASTM B151 bar; flanges to ASME B16.5 or EEMUA 145 |
| Grade availability | Every grade listed is made or supplied against order, with EN 10204 3.1 certificates (3.2 / third-party inspection when specified) and PMI on alloy, stainless, duplex and nickel grades. |
| Testing | Visual, dimensional and thread/socket gauge inspection; PMI on alloy and stainless grades; hardness check; MPI/DPT when specified |
| Documents | EN 10204 3.1 mill test certificate; 3.2 / third-party inspection when the order specifies; dimensional inspection report; IBR certification for boiler/steam service when specified |
Applications
- Joining lengths of small-bore pipe
- Instrument and thermowell connections on pipes and vessels
- Drain and vent branches
- Tank and vessel nozzles for small lines
Full coupling vs half coupling
A full coupling has sockets at both ends and joins two pipes in line. A half coupling has a socket on one end only; the other end is welded onto a header or vessel to create a branch. Half couplings are a simple branch option for small lines, while branch outlet fittings such as sockolets are often preferred where reinforcement must be demonstrated.
Technical data sheets
FAQ
Socket Weld Coupling: common questions
Is there a Class 9000 socket weld coupling?
Socket weld couplings are commonly supplied in Class 3000 and 6000. If your line is XXS pipe and needs a Class 9000 coupling, share the size and material and we will confirm the option.
How is a half coupling attached to a pipe?
A hole is cut in the run pipe, and the half coupling is set on or into the hole and welded with a full-penetration or fillet weld as the piping specification requires.
What is the gap requirement in a coupling?
Leave a gap of about 1/16" (1.5 mm) between the pipe end and the socket bottom before welding, per ASME B31.1/B31.3 practice, to allow for weld shrinkage.
Do you supply couplings in duplex stainless?
Yes. ASTM A182 F51 and F53 duplex couplings can be supplied in Class 3000 and 6000 with PMI reports and EN 10204 3.1 certificates, and third-party inspection when specified.
Need a size or grade not listed here?
Our engineering team manufactures against your drawing or datasheet, with dimensional sign-off before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
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