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JIESHENG HARDWARE is a leading manufacturer of stainless steel threaded coupling fittings with over 20 years of expertise in precision machining and pipe fitting production.
We provide both standard and custom stainless steel threaded couplings, designed for secure, leak-proof connections in critical fluid and gas systems. Our couplings are widely used in Industries such as oil & gas, chemical processing, water treatment, HVAC, food & beverage, and marine applications.
With advanced CNC Machining centers and strict quality control, we ensure every coupling meets international standards for dimension accuracy, thread quality, and corrosion resistance.
Key Features of JIESHENG Stainless Steel Threaded Couplings
Material Options: SS304, SS316, SS316L, Duplex stainless steel (2205), Super Duplex (on request)
Size Range: 1/8” to 6” (DN6 to DN150)
Thread Types: NPT, BSPT, BSPP, ISO, DIN, JIS, custom threads
Pressure Rating: 150#, 300#, 600#, up to 3000 psi (based on design & size)
Surface Treatment: Pickling, passivation, shot blasting, mirror polishing (for sanitary applications)
OEM/ODM Service: Custom engraving, packaging, non-standard sizes, special threads
Specifications of Stainless Steel Threaded Coupling Fittings
| Parameter | Capability / Options |
|---|---|
| Size | 1/8” - 6” (DN6 - DN150) |
| Material | SS304, SS316, SS316L, Duplex 2205, others on request |
| Threads | NPT, BSPT, BSPP, ISO, DIN, JIS, custom |
| Pressure rating | 150#, 300#, 600#, 3000 psi (depends on spec) |
| Temperature range | -20°C to +600°C (based on material) |
| Finish | Pickling, passivated, sandblasted, polished |
| Standards | ASME B16.11, ANSI B1.20.1, DIN, JIS, BS |
| Packaging | Plastic bags + carton + pallet / OEM packaging |
| MOQ | 50 pcs (samples & small batch accepted) |
| Lead time | 7-20 working days |
Manufacturing Process
We use precision machining and threading technology to ensure reliable quality:
CNC lathe turning for precise roundness and dimensions
Thread cutting by CNC or automatic threading machine
Deburring and chamfering for easy installation
Leak pressure testing (hydro or pneumatic) on request
Pickling & passivation for enhanced corrosion resistance
Logo engraving and custom marking (if required)
Applications
Our stainless steel threaded coupling fittings are suitable for:
Oil & gas pipelines
Chemical processing lines
Water supply & wastewater systems
HVAC & refrigeration piping
Food & beverage processing
Pharmaceutical & sanitary fluid systems
Marine & shipbuilding piping
Hydraulic and pneumatic systems
Why Choose JIESHENG HARDWARE
20+ years of pipe fittings manufacturing experience
In-house CNC Machining and threading for consistent quality
ISO 9001 certified factory with full traceability
Material certificates (EN10204 3.1, ROHS, SGS) available
Competitive factory price with short delivery time
Custom design, logo, and packaging options
Quality Assurance
Every coupling fitting is produced under strict quality controls:
100% visual inspection for threads and surface finish
Dimension inspection using gauges, calipers, thread testers
Pressure test report provided on request
Material certificates traceable to mill origin
FAQ – Stainless Steel Threaded Couplings
Q1: What thread types are available for your couplings?
A1: We provide NPT, BSPT, BSPP, ISO, DIN, JIS, and custom threads.
Q2: Can I get small quantity or samples for testing?
A2: Yes! We welcome sample orders or low MOQ for trial purposes.
Q3: What surface finishes do you provide?
A3: Our standard finishes include pickling + passivation, sandblasting, and polishing. Mirror polish available for sanitary-grade couplings.
Q4: Can you produce non-standard sizes or custom threads?
A4: Absolutely. We support OEM custom sizes, threads, and special features.
Q5: What certificates can you provide?
A5: EN10204 3.1 material certificate, ROHS, SGS, dimensional inspection reports, pressure test reports as required.
Q6: How long is the delivery time?
A6: Generally 7-20 working days depending on quantity and customization.
