Weld Neck Flange Supplier
OIS Middle East is a leading Weld Neck Flange Supplier, providing high-quality weld neck flanges (WN Flanges) for demanding industrial applications across the oil & gas, petrochemical, power generation, marine, water treatment, construction, and manufacturing sectors. Designed for high-pressure and high-temperature services, weld neck flanges offer exceptional strength, superior load distribution, and reliable long-term performance in critical piping systems.
Manufactured in accordance with international standards such as ASME, ASTM, API, EN, and DIN, our weld neck flanges are available in a wide range of sizes, pressure classes, materials, and facing types to meet the requirements of EPC contractors, engineering consultants, fabrication companies, and industrial end users.
With extensive inventory, technical expertise, and efficient logistics, OIS Middle East supplies weld neck flanges throughout the UAE, GCC countries, Africa, and international export markets, ensuring dependable quality and timely delivery for projects of every size
What is a Weld Neck Flange?
A Weld Neck Flange (WN Flange) is a forged flange featuring a long tapered hub that is butt-welded directly to the pipe. The tapered neck gradually transfers stress from the flange to the pipe, reducing stress concentration and improving structural integrity. This design makes weld neck flanges the preferred choice for high-pressure, high-temperature, and cyclic service applications.
Their robust construction minimizes the risk of leakage and fatigue, making them ideal for critical piping systems in refineries, offshore platforms, chemical plants, and power stations.
- Features & Benefits of Weld Neck Flanges
- Key Features
- Long tapered hub for enhanced strength
- Butt-weld connection for superior structural integrity
- Excellent resistance to pressure and temperature
- Smooth internal bore for unrestricted flow
- High fatigue resistance
- Precision machined sealing surfaces
- Long operational life
- Suitable for severe service conditions
- Benefits
- Reduced stress concentration
- Leak-proof performance
- Improved pipeline safety
- Easy inspection of weld joints
- Low maintenance requirements
- Reliable operation under cyclic loading
- Excellent vibration resistance
- Ideal for corrosive and hazardous environments
- Types of Weld Neck Flanges
- Raised Face (RF) Weld Neck Flanges
- Ring Type Joint (RTJ) Weld Neck Flanges
- Available Pipe Standards
- Flat Face (FF) Weld Neck Flanges
- Custom Weld Neck Flanges
- Materials Available
- Carbon Steel
- ASTM A105
- ASTM A350 LF2
- ASTM A694 F42
- ASTM A694 F52
- ASTM A694 F60
- ASTM A694 F65
- ASTM A694 F70
- Stainless Steel
- ASTM A182 F304
- ASTM A182 F304L
- ASTM A182 F316
- ASTM A182 F316L
- ASTM A182 F321
- ASTM A182 F347
- ASTM A182 F904L
- Duplex Stainless Steel
- ASTM A182 F51
- ASTM A182 F60
- Super Duplex Stainless Steel
- ASTM A182 F53
- ASTM A182 F55
- Alloy Steel
- ASTM A182 F11
- ASTM A182 F22
- ASTM A182 F5
- ASTM A182 F9
- ASTM A182 F91
- Nickel Alloys
Available upon request:
- Inconel
- Monel
- Hastelloy
- Alloy 20
- Nickel 200
- Manufacturing Standards
- Standards
- ASME B16.5
- ASME B16.47 Series A
- ASME B16.47 Series B
- MSS SP-44
- API 6A
- API 605
- EN 1092-1
- DIN Standards
- ISO Standards
- ASTM Material Specifications
- Pressure Ratings
We supply weld neck flanges in multiple pressure classes.
- ASME Pressure Classes
- Class 150
- Class 300
- Class 400
- Class 600
- Class 900
- Class 1500
- Class 2500
- Available Sizes
Our inventory includes weld neck flanges in a wide range of dimensions
- Standard Sizes
½ Inch to 60 Inches
- Larger Sizes
- Facing Types
We offer different flange facing options based on sealing requirements.
- Raised Face (RF)
- Ring Type Joint (RTJ)
- Flat Face (FF)
- Tongue & Groove (T&G)
- Male & Female (M&F)
- Surface Finish
Available surface finishes include:
- Serrated Finish
- Smooth Finish
- Machined Finish
- Black Painted
- Anti-Rust Coating
- Hot Dip Galvanized
- Zinc Coated
- Applications
- Applications
- Petrochemical Plants
- Power Generation
- Marine & Offshore
Reliable performance in corrosive offshore environments and shipbuilding applications
- Water Treatment
- Chemical Processing
- Construction & Infrastructure
- Technical Specifications
| Specification | Details |
|---|---|
| Product | Weld Neck Flange |
| Standard | ASME B16.5 / B16.47 |
| Material | Carbon Steel, Stainless Steel, Duplex, Alloy Steel |
| Size Range | ½” to 60″ |
| Pressure Classes | 150# to 2500# |
| Facing Types | RF, RTJ, FF, T&G, M&F |
| End Connection | Butt Weld |
| Surface Finish | Serrated, Smooth, Galvanized |
| Certification | EN 10204 3.1 / 3.2 |
- Quality Assurance
- Inspection & Testing
- Visual Inspection
- Dimensional Verification
- Ultrasonic Testing (UT)
- Magnetic Particle Testing (MPT)
- Positive Material Identification (PMI)
- Hardness Testing
- Chemical Analysis
- Mechanical Testing
- Third-Party Inspection
- Documentation
- EN 10204 3.1 Mill Test Certificate
- EN 10204 3.2 Certificate
- Material Traceability Reports
- Inspection Reports
- Dimensional Reports
- Value-Added Services
OIS Middle East provides additional services to support project requirements.
- CNC Machining
- Special Drilling
- Custom Flange Manufacturing
- Protective Coating
- Hot Dip Galvanizing
- Custom Marking
- Export Packaging
- Third-Party Inspection Coordination
- Logistics Support
- Why Choose OIS Middle East?
- Our Advantages
- Large inventory of standard and special flanges
- International quality standards
- Competitive pricing
- Fast delivery across UAE & GCC
- Technical engineering support
- Global sourcing network
- Custom manufacturing capabilities
- Complete documentation
- Experienced sales team
- Reliable after-sales support
- Industries We Serve
Our weld neck flanges are supplied to:
- Oil & Gas
- Petrochemical
- Chemical Processing
- Marine & Offshore
- Power Generation
- Water Treatment
- Desalination
- Construction
- Infrastructure
- Manufacturing
- Fire Protection
- Industrial Utilities
- Global Supply Network
OIS Middle East supplies weld neck flanges throughout:
- United Arab Emirates
- Saudi Arabia
- Oman
- Qatar
- Kuwait
- Bahrain
- Africa
- Asia
- Europe
- International Export Markets
- FAQ
A weld neck flange is a forged flange with a long tapered hub that is butt-welded to the pipe, providing superior strength and stress distribution for high-pressure piping systems
We supply weld neck flanges in carbon steel, stainless steel, duplex, super duplex, alloy steel, and nickel alloys.
Our flanges are manufactured according to ASME, ASTM, API, EN, DIN, and ISO standards.
We offer ASME Class 150, 300, 400, 600, 900, 1500, and 2500 weld neck flanges.
Yes. Raised Face (RF), Ring Type Joint (RTJ), and Flat Face (FF) flanges are available.
We supply sizes from ½ inch to 72 inches, with various wall thicknesses and schedules.
Yes. All products can be supplied with EN 10204 3.1 or 3.2 certification.
Yes. We supply customers across the UAE, GCC, Africa, Asia, Europe, and other international markets
