2 inch threaded pipe flange & 1 2 threaded rod flange | Supplier

Traditional US/EU flange distributors mark up factory costs by 30–60%, placing unnecessary strain on project budgets. A 2-inch threaded pipe flange that costs $4.80 ex-works is often sold at $9–12 in local channels.

Mismatched NPT thread tolerances, off-spec bolt circle diameters, and wall thicknesses that don't meet ASME B16.5 minimums. Result: leaking joints, rework, and even safety incidents.

Lead times stretching to 8–12 weeks. Port congestion, missing documents, and "unexpected" surcharges that blow up your landed cost calculations.

Buying your 2-inch flanges from one vendor, threaded rod flanges from another, and pipe fittings from a third creates coordination chaos, inconsistent quality, and finger-pointing when tolerances don't line up.

Many low-cost suppliers claim "ISO 9001" but cannot provide test certificates, material traceability (MTC EN 10204 3.1), or pressure ratings documentation—a compliance minefield for regulated industries.

When a flange fails hydrostatic testing, you need forensic analysis and an immediate replacement—not a customer service script. Most suppliers disappear after the invoice is paid.

Powerful In-house Manufacturing

CNC lathes, automatic thread rolling machines, and full dimensional inspection equipment. We control every step from raw steel forging to final threaded machining—ensuring thread pitch, depth, and concentricity meet ASME B1.20.1 exactly.

📌 LEDE TIME: 7–15 DAYS FOR STANDARD SIZES

Quality Assurance with Full Traceability

Every heat number is recorded. You receive material test certificates (EN 10204 3.1/3.2), hydrostatic test reports, and dimensional inspection reports. Random third-party inspection (SGS, BV, TÜV) is welcome at our factory.

📌 100% HYDROSTATIC TESTED AVAILABLE

OEM/ODM Design & Customization

Need a special thread depth? A reduced flange face? Custom bolt hole patterns? Our engineering team works directly with your drawings to produce flanges that drop into your system without re-engineering.

📌 1000+ CUSTOM DESIGNS DELIVERED

High-Speed Global Delivery

We ship to the USA, Canada, Russia, Kazakhstan, Algeria, and across Europe every week. FCL, LCL, air express (DHL/UPS/FedEx), or rail—we optimize the fastest, most economical method for your destination. Ex-works, FOB, CIF, DDP available.

📌 98.7% ON-TIME SHIPMENT RATE (2025)

Factory-Direct Pricing

No middleman markup. Typical customers save 30–45% vs. traditional US/EU distributor prices, even after freight and import duties. Request our price list and you'll see the difference immediately.

📌 SAVE UP TO 45% ON COMBINED ORDERS

Engineering-Grade Technical Support

Our sales engineers can answer questions about pressure ratings, material selection, gasket compatibility, and torque values. We don't just sell flanges—we help you specify the right configuration for your service conditions.

📌 FREE FLANGE SELECTION CONSULTATION

🔩 Thread Engagement & Torque Values

For 2-inch NPT flanges, typical thread engagement is 54.5 mm for hand-tight and minimum 22 mm for wrench-tight per ANSI B1.20.1. Recommended torque for Class 150 studs: 120–150 ft-lb (using properly lubricated B7 studs with 2H heavy hex nuts).

🧪 Pressure Test Requirements

Hydrostatic shell test pressure for Class 150 flanges: 425 psi minimum. Air test (pneumatic) optional per project specification. Each flange can be marked with WS (water seal), rating, and heat code per API 6A/customer requirements.

• Service: General water, oil, gas (non-corrosive)
• Tensile strength: ≥ 485 MPa (70 ksi)
• Temperature range: -29°C to 425°C
• Yield strength: ≥ 250 MPa (36 ksi)
• Best for: cost-effective, high-strength industrial piping

• Service: Chemical, marine, high-temperature, corrosive media
• Tensile strength (F304): ≥ 515 MPa (75 ksi)
• Temperature range: -196°C to 800°C
• Excellent resistance to oxidation and pitting (F316 with Mo)
• Best for: hygienic, coastal, and chemical processes

• Service: Low-pressure water, HVAC, plumbing
• Yield strength: ≥ 250 MPa (Grade 60-40-18)
• Excellent shock absorption and machinability
• Lower cost for large-volume orders
• Best for: building services & non-critical applications

• Service: High-temperature & high-pressure steam, petrochemical
• Temperature range: up to 550°C (F22)
• Superior creep resistance
• Common in power generation and refining
• Best for: critical high-energy processes

Oil & Gas Gathering Lines

2-inch NPT threaded flanges connect wellhead flow lines to choke manifolds and test separators in low-pressure (< 285 psi) applications.

Case: A Texas operator replaced imported flanges with our A105 units—saved 34% on landed cost, 100% pass rate on hydrostatic testing.

Chemical Processing Plants

Stainless steel 2-inch threaded flanges (F316) handle corrosive chemical lines where welding is not feasible or permitted on-site.

Case: A German chemical plant ordered 1,200 pcs F316 2" flanges + 500 pcs 1/2" rod flanges. On-site installation time reduced 22% vs. welding.

Structural Pipe Supports & Bracing

1/2-inch threaded rod flanges bolt onto threaded rods to create adjustable pipe supports, anchor points, and seismic bracing systems.

Case: A Canadian mechanical contractor used our zinc-plated 1/2" rod flanges in 2,000+ support assemblies for a high-rise HVAC system—zero rework.

Fire Protection (Sprinkler) Systems

Threaded flanges allow fast, code-compliant connections in NFPA 13-compliant sprinkler risers and fire pump test headers.

Case: A UK fire protection contractor achieved FM/UL compliance using our flanges with full MTC documentation.

Prices based on raw material index + machining cost + surface treatment. We quote in USD or EUR, with FOB (Tianjin/Qingdao), CIF, or DDP terms. No hidden charges—freight, insurance, and duties itemized on your PI.

• Standard sizes (in stock): 3–5 days
• Production orders: 7–15 days
• OEM/custom: 20–30 days (includes prototyping)
• Shipping USA/Europe: 15–30 days sea, 5–7 days air

Consolidate your flange order with pipe elbows, tees, reducers, and flanges to maximize container utilization. Our logistics team optimizes cargo mix—clients typically save 15–25% on freight vs. ordering from multiple suppliers.

A 2-inch threaded pipe flange has a female NPT or BSPT thread inside the bore, designed to screw onto a 2-inch threaded pipe for pressure-containing pipework connections (per ASME B16.5). A 1/2-inch threaded rod flange is a flat plate with a machined threaded hole (or welded threaded boss) that mounts onto a 1/2-inch threaded rod for structural support, anchoring, or bracing—it is not pressure-rated in the same sense. Both are manufactured to precise thread tolerances, but their applications differ fundamentally: one for fluid/gas containment, the other for mechanical load support.

Our threaded flanges are manufactured to ASME B16.5 (Class 150, 300, 600) and EN 1092-1. Thread forms are cut per ANSI B1.20.1 (NPT) or ISO 228 (BSP). Material grades follow ASTM A105, A182 F304/F316, or ductile iron per ASTM A395. Dimensional inspection reports and MTCs are provided with every shipment.

Yes. Standard finishes include zinc-plated (clear, yellow, or blue), hot-dip galvanized (HDG), black anti-rust oil, epoxy paint, or PTFE coating. For stainless steel flanges, we offer passivation, pickling, or electropolishing. Custom colors (e.g., safety red or OSHA blue) are available for large-volume orders.

For stock sizes of 2-inch threaded flanges, our MOQ is 50 pieces. For 1/2-inch threaded rod flanges, the MOQ is 200 pieces. For OEM/custom designs, MOQ is typically 300–500 pieces depending on complexity. We also offer sample orders (1–5 pcs) at sample cost, refundable on first bulk order.

We follow a 7-day quality response protocol. If a defect is confirmed (with photo/video evidence and third-party inspection if needed), we replace the defective pieces free of charge, covering freight for the replacement. Our goal is zero defective parts shipped—we achieve a 99.97% pass rate on dimensional inspection before packing.

We accept T/T (30% deposit, 70% before shipment or against BL copy), L/C at sight (for large orders), and Western Union for sample orders. For long-term partners, we can discuss open account terms after 3–4 shipments with consistent payment history.

We ship via LCL or FCL sea freight to major ports (Los Angeles, Rotterdam, Hamburg, Felixstowe), or air express (DHL/FedEx/UPS) for urgent small orders. For DDP terms, we handle customs clearance and import duties on your behalf. For FOB/CIF, we provide complete documentation (commercial invoice, packing list, bill of lading, certificates of origin) to ensure smooth customs clearance.

Absolutely. We encourage pre-production samples. Samples are typically shipped within 24 hours after payment of sample cost (usually USD 20–50 per piece via express courier). The sample cost is 100% refundable when the first bulk order exceeds USD 5,000.

Sarah JimenezProcurement Manager, Texas Oilfield Services

"We switched to Weihuan's 2-inch threaded pipe flanges late 2025 and cut our flange procurement costs by 37% without compromising quality. Hydrostatic test pass rate is 100%. Their sales engineer even helped us correct a thread spec issue before production—saved us from a costly field failure. Highly recommended."

Hans MüllerTechnical Director, German Chemical Plant

"The F316 stainless 2-inch flanges we ordered met all our material certifications, and the dimensional precision was better than our previous EU supplier. Delivery was 10 days faster than promised. Their after-sales support is exceptional."

Mike DavidsonOperations Manager, Ontario Mechanical Contractor

"We ordered 5,000 pieces of 1/2-inch threaded rod flanges for a high-rise HVAC support project. The zinc coating was consistent, threads were clean and uniform—zero install issues. We're now on our third repeat order. Their DDP shipping made the whole process painless."

Anna KowalskaSupply Chain Manager, UK Fire Protection Systems

"We needed 2-inch threaded flanges with UL-listed gaskets for a London project. Weihuan's team coordinated everything, including the third-party inspection report we sent to our UL assessor. Project passed with zero non-conformances."

Senior International Sales Engineer & Piping Systems Specialist

With more than 14 years of experience in the steel pipe, flange, and pipe fitting industry, I've personally managed over 200 export projects to North America, Europe, and the Middle East. My background includes on-site manufacturing process engineering, quality control management, and international logistics coordination. I have contributed to pipe fitting selection guides for Malleable Iron fittings (referenced in the 2025 Ultimate Guide to Malleable Pipe Fittings) and maintain a network of verified foundries across China to ensure best-in-class supply. I write these articles to help engineers and buyers make confident, informed purchasing decisions. Feel free to connect with me directly via WhatsApp or email whxs@weihuantube.com.