PRODUCT FEATURES
Threaded Equal Socket — Product Features
Suitable for water treatment, piping systems, mechanical pipelines, fire protection, light chemical industries, food processing equipment, pump and valve assemblies, and various other industrial piping connections.
Product Feature
Buyer Information
Product Feature
For bulk orders, an EN 10204 3.1 material test certificate can be provided. OEM branding/custom marking is available. Samples can be sent prior to mass production for quality verification. Please confirm the thread type and dimensions before placing your order to ensure compatibility during on-site installation.
OPERATING PRINCIPLE
How Threaded Equal Socket Works
1. Double Female Threads: Features internal threads at both ends, designed to connect two externally threaded pipe fittings of the same specification.
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2. Fully Forged Body
Boasts a dense internal structure free from pores or sand holes, offering excellent high-pressure resistance.
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3. AISI 304 Stainless Steel
Provides outstanding rust resistance; suitable for use with fresh water, mildly corrosive media, and in outdoor environments.
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4. Precision-Machined Threads
Available with NPT or BSPT tapered pipe threads, ensuring a tight fit and reliable sealing.
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5. Pressure Ratings
150LB / 3000LB; manufactured in accordance with MSS SP-83 and ASME B16.11 standards.
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6. Pickled and Passivated
Features a smooth surface with enhanced corrosion protection, ensuring a long service life.
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7. Comprehensive Range
Available in sizes from 1/8″ to 4″ (DN6 to DN100); custom marking/labeling options supported.
ENGINEERING DATA
Technical Specifications
Technical data supplied for Threaded Equal Socket. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| – Material | AISI 304 (ASTM A182 F304) |
| – Type | Full Coupling (double female threaded) |
| – Thread Standard | NPT (ANSI B1.20.1) / BSPT (BS EN 10226-1) |
| – Pressure Rating | 150LB / 3000LB |
| – Manufacturing Standard | MSS SP-83, ASME B16.11 |
| – Surface Treatment | Pickling and Passivation |
| – Operating Temperature | -20°C to +120°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 | L | d | D |
|---|---|---|---|
| 1/2 | 27 | 21 | 27 |
| 3/4 | 30 | 24 | 29 |
| 1 | 37 | 31 | 32 |
| 11/4 | 45 | 39 | 37 |
| 11/2 | 51 | 45 | 40 |
| 2 | 65 | 57 | 43 |
| 2-1/2 | 81 | 73 | 45 |
| 3 | 95 | 87 | 48 |
| 4 | 122 | 112 | 53 |
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.
What thread standards are available for these stainless steel female threaded fittings?
We support NPT (ASME B1.20.1), BSPP (G), BSPT (Rc). Thread standards are NOT interchangeable. Please confirm thread type, size and TPI before placing your order to avoid mismatching on site.
What is the material grade? Can a Material Test Report (MTR) be provided?
Answer: The standard material is AISI 304 (ASTM A182 F304 / CF8). A Material Test Report (MTR) can be provided upon request. Other available material grades include 304L, 316L, and 316.
What material grades are available?
Answer: Stainless steel grades: ASTM A182 F304 / F304L / F316 / F316L.
All raw materials are supplied with a Material Test Certificate (MTC) and a Positive Material Identification (PMI) report to meet the buyer’s traceability requirements.
What are the pressure ratings/working pressures?
Answer: Standard 304 threaded pipe caps are typically classified as Class 150 or Class 3000; the maximum working pressure varies depending on the temperature. Every batch of products undergoes hydrostatic testing.
Which thread standards are supported?
BSPT, BSPP (G), or NPT standards are supported. Please specify the required thread type when placing an order.
What is the size range?
1/8 inch to 4 inches.
What documents and certificates are available for customs clearance and on-site inspection?
Answer:
– MTC (Material Test Certificate, for ASTM material traceability)
– PMI (Positive Material Identification report)
(These documents must be requested in advance; additional costs may apply, and lead times may be extended.)
What surface finishes are available?
Answer: The standard finish is a pickled matte surface. Other options include a satin finish or a mirror-polished finish suitable for sanitary/hygienic applications.
Why might a leak occur after installation? A: Primary causes:
1. Mismatched thread standards (e.g., mixing NPT and BSP standards).
2. Damaged threads or the presence of burrs.
3. Insufficient application of PTFE sealing tape (thread seal tape).
4. Overtightening, leading to thread galling (seizing).
It is recommended to wrap 2–3 layers of PTFE sealing tape before installation.
What is the Minimum Order Quantity (MOQ)?
Small-batch orders are accepted, and a single order may include products of different specifications.
What is the lead time?
Typically, shipments are dispatched within 7–15 days of receiving the deposit, depending on the order quantity.
How is quality controlled?
Raw material inspection → CNC machining → Thread inspection → Hydrostatic testing → Visual inspection → Final dimensional verification before packaging.
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.
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.
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 Equal Socket
304 Stainless Steel Forged Full Coupling, female-threaded at both ends, available in 150 lb or 3000 lb pressure ratings, with options for NPT or BSPT threads.
This SS304 forged full coupling features female threads at both ends and is designed to connect two externally threaded pipes of the same specification. It is precision-machined, highly corrosion-resistant, and suitable for use in industrial piping and water supply systems. Material Test Certificates (MTC) are available upon request.
Type: Threaded Equal Socket
Material: 304/316L stainless steel
Nominal diameter: 1/4”–4” (D8–DN100)
Rated pressure: 150LB/3000LB
Connection type: Threaded connection (BSPT / BSPP / NPT)
