Socket Weld Coupling Manufacturer, Stockist & Supplier
Product Overview
Sagiant Piping Industries manufactures socket-weld and threaded couplings — full couplings, half couplings and reducing couplings — in carbon steel, low-temperature steel, alloy steel, stainless steel, duplex and nickel alloys to ASME B16.11. Couplings join or branch small-bore pipe in Class 3000, 6000 and 9000, sizes 1/8" to 4", with full heat traceability, EN 10204 3.1/3.2 certificates, PMI, MPI/DPT and IGC testing.
Couplings — full / half / reducing, grades and classes
Socket-weld & threaded couplings in every grade — types, pressure classes, standards and mechanical data on one page.
Technical Specification
| Parameter | Specification |
|---|---|
| Types | Full coupling, half coupling, reducing coupling (SW & THD) |
| Materials | Carbon, low-temp, alloy, stainless, duplex, nickel |
| Size Range | 1/8" – 4" (NPS) |
| Pressure Classes | 3000, 6000, 9000 (SW); 2000, 3000, 6000 (THD) |
| Ends | Socket-weld or NPT threaded (ASME B1.20.1) |
| Testing & Docs | PMI, MPI/DPT, IGC, MTC EN 10204 3.1/3.2, TPI |
Manufacturing Process & Process Notes
Couplings are closed-die forged, heat treated to grade and machined with socket bores or NPT threads. A full coupling joins two pipe ends; a half coupling provides a single socket/thread for branch or instrument connections welded to a vessel or run; a reducing coupling joins two different pipe sizes.
Grades & Materials Supplied
| Material Family | Forged Grades (full list) | Applicable Standard | Service / Notes |
|---|---|---|---|
| Carbon steel | A105, A105N | ASME B16.11 / A105 | General forged fittings |
| Carbon steel (low-temp) | A350 LF2, LF3, LF6 | ASME B16.11 / A350 | Low-temperature service |
| Alloy steel (Cr-Mo) | A182 F1, F5, F9, F11, F12, F22, F91, F92 | ASME B16.11 / A182 | High-temperature & creep service |
| Stainless (austenitic) | A182 F304, 304L, 304H, 309, 310, 316, 316L, 316H, 317, 317L, 321, 321H, 347, 347H | ASME B16.11 / A182 | Corrosion & high-temperature service |
| Duplex / super duplex | A182 F51 (2205), F60, F53 (2507), F55, F44, F50 | ASME B16.11 / A182 | Chloride, sour & high-strength service |
| Nickel / Monel | B564 N02200 (Ni 200), N04400 (Monel 400) | ASME B16.11 / B564 | Caustic & marine service |
| Inconel / Incoloy | B564 N06600 (600), N06625 (625), N08800/08810 (Incoloy 800/800H), N08825 (825) | ASME B16.11 / B564 | High-temperature & severe corrosion |
| Hastelloy / Alloy 20 | B564 N10276 (C-276), N06022 (C-22), N08020 (Alloy 20) | ASME B16.11 / B564 | Aggressive acid & chemical service |
Pressure Classes & Bore Equivalence
| Class | Type | Schedule Equivalence | Service |
|---|---|---|---|
| 2000 | Threaded | ≈ Sch 80 bore | Low / medium pressure |
| 3000 | Socket-weld & threaded | ≈ Sch 80/160 bore | General process |
| 6000 | Socket-weld & threaded | ≈ Sch 160 bore | High pressure |
| 9000 | Socket-weld | ≈ XXS bore | Very high pressure |
Class sets the wall thickness and pressure rating per ASME B16.11; actual rating depends on material and temperature.
Standards & Specifications
| Scope | Applicable Standards |
|---|---|
| Dimensions / ratings | ASME B16.11 |
| Threads | ASME B1.20.1 (NPT) |
| Welding | ASME B31.3 socket-weld detail |
| Material | ASTM A105, A350, A182, B564 |
| Sour service | NACE MR0175 / ISO 15156 |
Mechanical Properties (representative grades)
| Grade | Tensile (MPa, min) | Yield (MPa, min) | Elong (%, min) | Notes |
|---|---|---|---|---|
| A234 WPB | 415–585 | 240 | 22 | Carbon steel |
| A234 WPC | 485–655 | 275 | 20 | Carbon steel (higher strength) |
| A420 WPL6 | 415–585 | 240 | 22 | Low-temp, charpy at -46°C |
| A234 WP11 Cl.1 | 415–585 | 205 | 22 | 1¼Cr-½Mo alloy |
| A234 WP22 Cl.1 | 415–585 | 205 | 22 | 2¼Cr-1Mo alloy |
| A234 WP91 | 585–760 | 415 | 20 | 9Cr-1Mo-V alloy |
| A403 WP304/304L | 485 / 485 | 205 / 170 | 35 | Austenitic stainless |
| A403 WP316/316L | 485 / 485 | 205 / 170 | 35 | Mo-bearing stainless |
| A815 WPS31803 (2205) | 620 | 450 | 25 | Duplex |
| A815 WPS32750 (2507) | 795 | 550 | 15 | Super duplex |
| B366 WPNCI 625 | 760 | 345 | 30 | Inconel 625 |
| B366 WPHC276 | 690 | 283 | 40 | Hastelloy C-276 |
Testing, Inspection & Documentation
| Test / Document | Detail |
|---|---|
| PMI | Positive material identification on alloy, stainless & nickel grades |
| NDT | UT, RT, MPI/DPT as specified; 100% visual |
| Mechanical | Tensile, hardness, impact (low-temp), flattening |
| Corrosion (SS/duplex) | IGC per ASTM A262 Practice E; ferrite check (duplex) |
| Certification | EN 10204 3.1 / 3.2 mill test certificate; NACE MR0175 where required |
Applications & Industries Served
Available Forms, Sizes & Range
Supplied in all coupling types, grades and classes. Share type, NPS, class, end (SW/THD) and material grade.
| Item | Size Range | Wall / Thickness / Rating | Standard |
|---|---|---|---|
| Full coupling | 1/8" – 4" | Class 3000/6000/9000 | ASME B16.11 |
| Half coupling | 1/8" – 4" | Class 3000/6000/9000 | ASME B16.11 |
| Reducing coupling | 1/4" – 4" | Class 3000/6000 | ASME B16.11 |
| Threaded coupling | 1/8" – 4" | Class 2000/3000/6000 | ASME B16.11 |
Frequently Asked Questions
What is the difference between a full and half coupling?
A full coupling has a socket/thread at both ends to join two pipes; a half coupling has a single socket/thread at one end (the other is plain for welding to a vessel or run) for branch and instrument connections.
What pressure classes are available?
Socket-weld couplings in Class 3000, 6000 and 9000; threaded couplings in Class 2000, 3000 and 6000 per ASME B16.11.
What is a reducing coupling?
A coupling with two different socket/thread sizes used to join pipes of different diameters on small-bore lines.
What grades do you supply?
A105 carbon, A350 low-temp, A182 alloy/stainless/duplex and B564 nickel alloys.
Product Range
The socket weld coupling range can be supplied with related pipes, tubes, butt weld fittings, forged fittings, flanges, fasteners and custom fabricated items where required by the BOQ.
Applications
For dimensional references, see the Pipe Schedule & Fittings Guide. For related supply, review Pipes & Tubes, Butt Weld Fittings, Forged Fittings and Flanges.
Types of Products
| Type | Description |
|---|---|
| Seamless / Welded | Pipes and tubes by manufacturing route |
| Fittings | Elbows, tees, reducers, caps and custom fittings |
| Flanges | Weld neck, slip-on, blind, socket weld and special flanges |
| Fasteners | Stud bolts, nuts, washers and coated fasteners |
Available Forms
Share your BOQ, grades, sizes and quantities for a technical quote with documentation scope.
or call +91 93211 58080Related Products
Calculate approximate metal weight before sending RFQ
Estimate pipe, tube, bar, plate and hollow section weight using material density presets, then share the result with your requirement.
Frequently Asked Questions
What materials does Sagiant Piping Industries supply?
Sagiant Piping Industries can supply stainless steel, carbon steel, alloy steel, duplex, super duplex and nickel alloy products subject to project requirement.
Do you provide MTC and test certificates?
MTC, test certificates, heat number traceability and inspection documents can be coordinated based on the material, standard and project scope.
Can Sagiant supply as per project BOQ?
Yes. The team can review BOQs, line lists, drawings and specifications to support pipes, fittings, flanges, fasteners and fabricated items.
Do you support third-party inspection?
Third-party inspection, PMI and dimensional inspection support can be arranged when required by the enquiry or project documentation.
Can you supply both pipes and fittings together?
Yes. Sagiant Piping Industries can support combined RFQs for pipes, fittings, flanges, fasteners and related materials.
Do you manufacture custom fabricated fittings?
Custom fabricated fittings and special items can be supplied as per drawing, BOQ and inspection requirement, subject to feasibility.
Pipes & TubesSeamless, welded, ERW, EFW, LSAW and SSAW options for industrial piping projects.View pipes
Pipe FittingsButtweld, forged, outlet and special fittings for BOQ and line-list requirements.View fittings
FlangesWeld neck, slip on, blind, socket weld, threaded and special flanges.View flanges
FastenersBolts, nuts, washers, stud bolts, anchor bolts and U-bolts.View fasteners
Bars & RodsRound, bright, hex, square and flat bars for machining and fabrication.View bars & rods
Sheets, Plates & CoilsSheets, plates, coils, strips, shims and foils in project grades.View sheets & platesA controlled path from requirement to delivery support
A technical RFQ flow built for engineers, QA teams and project buyers who need clear standards, traceability and dispatch documentation.
Requirement Submission
Share product, grade, size, class, quantity, drawing and delivery location.
Technical Review
Review standards, specifications, missing inputs and service conditions.
Material Selection
Align stainless, carbon, alloy, duplex, titanium or nickel alloy grades.
Quotation & Approval
Confirm commercial scope, documents, inspection needs and timelines.
Production / Sourcing
Coordinate manufacturing, stock sourcing or fabrication as per scope.
Quality Inspection
Manage dimensional checks, MTC review, PMI or third-party inspection.
Dispatch & Documentation
Prepare packing, tagging, test certificates and dispatch documents.
Delivery Support
Support delivery coordination, document handover and project closure.