PRODUCT FEATURES
Threaded Coupling — Product Features
Water treatment, piping systems, mechanical pipelines, food and beverage, light chemical industry, heating and cooling circulation systems, pump and valve connections, and general industrial process piping.
Product Feature
Buyer Information
Product Feature
For bulk orders, EN 10204 3.1 material test certificates are available. OEM branding/custom marking is supported. Samples can be provided prior to mass production to verify dimensions and thread specifications. Please ensure you confirm the thread type and size before placing an order to avoid any mismatches during on-site installation.
OPERATING PRINCIPLE
How Threaded Coupling Works
1. Dual Female Thread Design: Features female threads at both ends, designed to connect two externally threaded pipe fittings of the same nominal size.
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2. Forged/Seamless Construction
Offers a compact and robust structure, free from porosity or sand holes, with excellent high-pressure resistance.
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3. AISI 304 Stainless Steel
Provides reliable rust and corrosion resistance; suitable for use with fresh water, mildly corrosive media, and outdoor installations.
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4. Precision Threading
Available with NPT, BSPT, or BSPP threads, manufactured with strict tolerance control to ensure a tight, secure assembly.
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5. Pressure Ratings
150LB / 3000LB; compliant with ISO 4144 and MSS SP-83 standards.
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6. Pickled and Passivated Surface
Delivers a clean metallic finish, further enhancing corrosion resistance and extending service life.
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7. Comprehensive Range
Available in sizes from 1/8″ to 4″ (DN6 to DN100), with support for customized marking.
ENGINEERING DATA
Technical Specifications
Technical data supplied for Threaded Coupling. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| – Material | AISI 304 (ASTM A182 F304 / 1.4301) |
| – Type | Threaded Coupling (Full Coupling) |
| – Thread Standard | NPT (ANSI B1.20.1) / BSPT / BSPP (ISO 7/1, DIN 2999) |
| – Pressure Rating | 150LB / 3000LB |
| – Standards | ISO 4144, MSS SP-83 |
| – Surface Treatment | Pickling and Passivation |
| – Operating Temperature | -20°C to +200°C |
MECHANICAL DIMENSIONS
Dimensions & drawings.
Compare connection size with the corresponding overall length, bore and handle clearance dimensions from the supplied drawing.
Dimension chart
| SIZE | φ1 | φ2 | B | A |
|---|---|---|---|---|
| 1/4 | 17 | 12 | 6 | 24 |
| 3/8 | 21 | 14 | 6 | 30 |
| 1/2 | 26 | 20 | 5 | 32 |
| 3/4 | 32 | 24 | 8 | 35 |
| 1 | 40 | 30 | 9 | 42 |
| 1-1/4 | 48 | 40 | 9 | 47 |
| 1-1/2 | 54 | 45 | 12 | 50 |
| 2 | 68 | 55 | 12 | 56 |
| 2-1/2 | 83 | 71 | 14 | 64 |
| 3 | 97 | 84 | 16 | 70 |
| 4 | 123 | 190 | 19 | 79 |
Refer to the supplied dimension chart.
APPLICATIONS
Applications
Applicable media: the supplied document lists the following fluids. Actual compatibility depends on selected materials, concentration, temperature, pressure and the specific service conditions.
Application – Water Circulation
Cooling water, circulating water, drinking water and neutral purified water.
Application – Steam Piping
Clean, low-temperature saturated steam, subject to the product’s confirmed temperature and pressure limits.
Application – Compressed Air
Compressed air and nitrogen; verify compatibility for each system.
PURCHASING SUPPORT
Frequently Asked Questions
Find answers to common questions about sizing, materials, threaded connections and operating conditions.
1、What is Threaded Coupling?
A threaded coupling is a straight pipe fitting with **female internal threads on both ends**. It is designed to join two male threaded pipe nipples or pipe ends of the same nominal size. It is also called full coupling.
Note: Full coupling (both female thread) is different from half coupling (one female thread, one weld end). Please clarify if you need full or half coupling.
2、What thread standards are available?
We support NPT (ASME B1.20.1), BSPT (Rc, EN10226), BSPP (G, ISO228-1).
Threads are NOT interchangeable. Please confirm thread standard and size before order.
3、What stainless steel grades can you supply?
Standard grades:
– 304 / CF8 for water, air and general low-corrosion applications
– 316 / 316L / CF8M for coastal, brine, chemical and chloride-containing media
Duplex, 321 and other special alloys are available upon custom request.
4、What standards and pressure rating?
Cast version follows ISO4144 / MSS SP-114, Class 150LB (PN20).
Forged bar machined version complies with ASME B16.11, available in 3000LB / 6000LB.
Pressure rating depends on material, wall thickness and production process.
5、Manufacturing process: casting or bar stock machined?
Standard stock items: lost wax investment casting.
High-pressure, high-purity or heavy-duty application: solid bar CNC machined at higher cost.
7、Can you provide MTC material certificate?
Yes, EN10204 3.1 MTC with heat number is available. EN10204 3.2 third-party certificate can be arranged at buyer’s extra cost.
8、Surface finish options?
Standard: pickled matte finish.
9、Can you do laser marking?
Yes. We can mark size, grade, heat number, customer logo or brand on the flats.
10、Packaging for sea shipment?
Male threads are protected by plastic thread caps. Packed into export cartons, then loaded on fumigated wooden pallets with waterproof stretch film to avoid scratch and thread damage.
11、What is the lead time?
Typically, shipments are dispatched within 7–15 days of receiving the deposit, depending on the order quantity.
12、How is quality controlled?
Raw material inspection → CNC machining → Thread inspection → Hydrostatic testing → Visual inspection → Final dimensional verification before packaging.
13、Which Incoterms are available for overseas buyers?
We offer FOB (Free On Board) terms, with the shipment originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for import customs clearance.
14、Which Incoterms are available for buyers?
We offer FOB (Free On Board) or CIF (Cost, Insurance, and Freight) terms, with shipments originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for customs clearance.
15、What should be done if the threads are found to be defective or do not meet requirements upon arrival?
Please provide photos, videos, and inspection records. We will assess the root cause; depending on the contractual terms, solutions may include product replacement, a partial refund, or a reshipment.”
Threaded Coupling
304 Stainless Steel Threaded Full Coupling, with female threads at both ends; available in pressure ratings of 150 LB or 3000 LB, and with NPT or BSP thread options.
This SS304 full coupling features female threads on both ends and is designed to connect two externally threaded pipes of the same specification. The product offers excellent corrosion resistance and is suitable for use in industrial piping systems. Material Test Certificates (MTC) are available upon request.
Type: Threaded Coupling
Material: 304/316L stainless steel
Nominal diameter: 1/4”–4” (D8–DN100)
Rated pressure: 150LB/3000LB
Connection type: Threaded connection (BSPT / BSPP / NPT)
