Weld Neck Flange
High-pressure integrity for critical oil & gas applications. ASME B16.5 / B16.47.
A105
316L
F22
1983
Year Founded
100+
Skilled Workers
Who We Are
Founded in 1983, JS FITTINGS is an ASME-standard flange manufacturer based in Yanshan, China -- the pipe fittings capital of the country. With a 35,000 m² production facility and over 100 skilled workers, we produce forged steel flanges for oil & gas, petrochemical, power generation, and marine industries worldwide.
From raw material sourcing to final dimensional inspection, every step is controlled in-house to ensure quality, traceability, and on-time delivery.
Full MTR Traceability
Material Test Reports provided with every batch -- full chemical and mechanical property documentation.
Vertically Integrated Factory
Forging, machining, heat treatment, and QC -- all in-house. No third-party risk, no supply chain surprises.
Global Shipping Expertise
90+ containers shipped monthly to 50+ countries -- North America, Middle East, South America, Southeast Asia, and Africa.
What We Manufacture
From Class 150 to Class 2500, carbon steel to exotic alloys -- every flange is forged, machined, heat-treated, and inspected in our own facility before it ships.
High-pressure integrity for critical oil & gas applications. ASME B16.5 / B16.47.
Solid disc for pipeline termination. Available in all pressure classes up to 2500.
Cost-effective and easy to align. Ideal for low-pressure service lines.
For small-bore, high-pressure piping. Superior fatigue resistance.
No-weld installation for low-pressure, non-critical services. NPT / BSPT available.
Precision flow measurement flanges. Matched pairs with tapped holes per ASME B16.36.
Isolation & flow control in one piece. Custom sizes per API 6A and ASME.
More Products
Can't find your spec? We manufacture to custom drawings, special alloys, and non-standard dimensions.
Material Range
Standards Covered
In-House Production
Our vertically integrated factory controls every step -- eliminating third-party risk and ensuring MTR traceability for every batch.
Raw Material Sourcing
Certified steel billets from approved mills -- carbon steel, stainless, and alloy grades. Full PMI on request.
Forging Workshop
3,000T / 1,600T / 800T friction presses -- in-house die forging for all sizes up to 60".
Heat Treatment
3 gas-fired car-bottom furnaces -- normalizing, annealing, quench & temper per ASTM requirements.
CNC Machining Center
40+ CNC lathes, drilling & milling machines for precision dimensional control to ±0.1mm.
Testing & Final Inspection
Spectrometer, UTM, impact tester, hardness tester, UT flaw detector -- full in-house QC before shipment.
1,800T
Monthly Capacity
15d
Min. Lead Time
Standard Lead Time
15-30 days for first container; +10 days each additional. Monthly capacity: ~1,800 tons.
Quality Assurance
Our certifications and oil major vendor approvals are your assurance that every flange meets the highest international quality and safety standards.
ISO 9001
Quality Management System
CE Certification
EU Market Access
GOST-R
Russian National Standard
PETROBRAS
Brazil -- Approved Vendor
ADNOC
Abu Dhabi, UAE -- Approved Vendor
NIOC
Iran -- Approved Vendor
50+
Countries Served
Industries We Serve
Oil & Gas
Petrochemical
Power Generation
Shipbuilding
Offshore
Water Treatment
2h
Inquiry Response
95%
On-Time Delivery
98%
Repurchase Rate
<0.5%
Complaint Rate
What Our Clients Say
"We've been sourcing ASME B16.5 flanges from JS Fittings for over 5 years. Their MTR documentation is always complete, dimensional tolerances are consistent, and delivery never slips. They're our primary supplier for carbon steel and alloy flanges."
Michael R.
Procurement Manager -- Stocking Distributor, USA
"We needed Class 1500 weld neck flanges in F22 alloy for a refinery project in the UAE. JS Fittings provided ADNOC-compliant documentation, competitive pricing, and delivered on schedule. Their technical team responded within hours every time."
Ahmed K.
Project Engineer -- EPC Contractor, UAE
"As a trading company handling orders for multiple end-users, we need a supplier who can respond fast and handle mixed lots. JS Fittings ships our orders accurately, packages properly, and their after-sale support is excellent. Highly recommended."
Carlos L.
Director -- Industrial Trading Company, Brazil
Who We Supply
Stocking Distributors
High volume, stable repeat orders
Engineering Contractors
Project-based, custom specs
Trading Companies
Rapid response, mixed lots
Ready to Source?
Send us your spec sheet or drawing. Our engineering team will respond with pricing, material certificates, and delivery schedule -- no obligation.
Wuliyao Industry Zone, Yanshan County, Cangzhou City, Hebei Province, China
Request a Quote
Response within 2 hours