Image not available
Metals & minerals
3 threaded flanges & flange for piping networks | Cheap
<p>Engineered for cross-border piping networks across USA & Europe — cut procurement costs by up to 35% without compromising on ISO 9001, CE, ANSI/ASME, and UL compliance.<br/></p>
SupplierCangzhou Weihuan Pipeline Equipment Co.,Ltd.www.weihuantube.com
Source categories
About this product
Product information from the supplier.
⚙️ INDUSTRIAL PIPING CONNECTION SOLUTIONS 2026
3 Threaded Flange Specs: NPT/BSPT Dimensions, Pressure Ratings & Piping Network Compliance
Engineered for cross-border piping networks across USA & Europe — cut procurement costs by up to 35% without compromising on ISO 9001, CE, ANSI/ASME, and UL compliance.
Trusted by procurement teams in 20+ countries • ISO 9001 • CE • ANSI/ASME • RoHS
📑 Table of Contents
1. The Hidden Cost of Threaded Flange Procurement
2. 3 Threaded Flange — Engineering Breakdown
3. Technical Specification Matrix
4. Material Selection & Corrosion Performance
5. Industry Applications & Case Studies
6. Quality Certifications & Global Compliance
7. Customer Reviews & Field Results
8. FAQ — Procurement & Technical
9. Author & Factory Credentials
10. Request a Quote Today
The Hidden Cost of Threaded Flange Procurement: 4 Risks Killing Your ROI
🔴 Price Volatility & Hidden Markups
Global steel prices fluctuated ±22% in 2024–2025 alone. Many suppliers pass on raw material speculation instead of absorbing it — inflating your total cost of ownership (TCO) by as much as 30% before freight is even added.
🔴 Substandard Thread Integrity
A 2025 Cureus Journal study on rigid flange coupling systems found that improper thread engagement causes 41% of joint failures in field applications. Cheap imports often cut corners on NPT thread tolerances, leading to leaks that shut down entire lines.
🔴 Freight & Lead-Time Nightmares
High shipping costs are the #2 complaint from procurement managers. Cross-border air freight for heavy flanges can cost $8–$15 per kg, while ocean freight adds 35–50 days. A supplier without consolidated shipping partnerships quietly destroys your project timeline.
🔴 Certification Gaps & Compliance Risk
Non-compliant flanges can void your plant's insurance, trigger OSHA fines averaging $145,000 per incident, and delay regulatory audits. Without ANSI/ASME B16.5 traceability and material test certificates (MTC), you're flying blind.
👉 If any of these sound familiar, talk to our engineering team before your next PO.
Introducing the 3 Threaded Flange: Built for Piping Networks That Can't Afford Downtime
Our 3 threaded flange series (ANSI B16.5 Class 150/300, NPT/BSPT) is manufactured on CNC thread lathes for consistent taper, with 100% hydrostatic pressure testing. It's a direct replacement for legacy flanges from major Western brands at 30–45% lower landed cost.
🏭
Powerful Factory, Direct Pricing
In-house forging + threading = no middleman markup. Enjoy 25–35% lower TCO vs. Western distributors.
🔩
Thread Integrity You Can Trust
Full NPT taper gauge inspection on every batch. 0.02mm thread profile accuracy ensures leak-free joints.
⚡
High-Speed Global Delivery
DDP shipping to 20+ countries. 15-day production sprint for standard 3-inch flanges.
3 Threaded Flange — Technical Specification Matrix
Full traceability: heat number, chemical composition, and mechanical properties on every MTC.
| Parameter | 3 Threaded Flange (Class 150) | 3 Threaded Flange (Class 300) | Test Method |
|---|---|---|---|
| Nominal Pipe Size | 3 inch (DN80) | 3 inch (DN80) | ANSI B36.10 |
| Thread Standard | NPT (ANSI B1.20.1) | NPT / BSPT (ISO 7) | Thread Gauge |
| Flange Outer Diameter | 190.5 mm (7.5 in) | 209.6 mm (8.25 in) | Vernier Caliper |
| Bolt Circle Diameter | 152.4 mm (6.0 in) | 168.3 mm (6.625 in) | CMM Report |
| Number of Bolt Holes | 4 | 8 | Visual / Gauge |
| Bolt Hole Diameter | 19.1 mm (0.75 in) | 22.2 mm (0.875 in) | Plug Gauge |
| Hub Diameter | 69.9 mm (2.75 in) | 79.5 mm (3.13 in) | Vernier Caliper |
| Flange Thickness | 19.1 mm (0.75 in) | 23.9 mm (0.94 in) | Ultrasonic Test |
| Working Pressure | Up to 19.0 bar @ 50°C | Up to 50.7 bar @ 50°C | Hydrostatic 1.5x |
| Material Grades | A105, A182 F304/316, LF2 | A105, A182 F304/316, LF2 | Spectrometer |
| Surface Finish | Anti-rust oil + zinc | Hot-dip galvanized / epoxy | Coating Thickness Gauge |
| Marking & Traceability | ANSI B16.5 • ASTM A105 • Heat # | ANSI B16.5 • ASTM A105 • Heat # | Laser Marking |
* Full dimensional report available for download. Custom sizes (DN25–DN300) available on OEM request.
Engineering Validation: What the Literature Says About Flange & Fitting Performance
We don't just claim quality — we back it with peer-reviewed engineering research and field data.
📐 Flange Sealing Structure Optimization
Research published in Brodogradnja (DOI: 10.21278/brod75207) demonstrated that optimized flange sealing geometries — specifically tuned cone angle and curvature radius — increase contact pressure by 22% while reducing equivalent stress. Our CNC-machined 3 threaded flange faces apply these same optimization principles to every sealing surface.
🔬 Bolted Flange Joint Dynamics
Luan et al. (Journal of Sound and Vibration, 2012) established that bolted flange joint stiffness directly dictates system-level vibration response. Our flanges are manufactured to ±0.1mm bolt hole tolerance, ensuring uniform gasket compression and predictable joint behavior under dynamic loads.
🏗️ Tee & Fitting Stress Indices
Sustained stress indices (SSI) at tee connections per ASME B31 codes are critical for safe piping design (International Journal of Pressure Vessels & Piping). While tees handle flow branching, threaded flanges must absorb the resulting moment loads. Our thicker hubs on 3 threaded flanges provide 30% more moment resistance than standard ASME minimums.
🧪 Material Selection Framework
A 2025 Cureus Journal of Engineering study on rigid flange couplings provides a decision matrix for material selection balancing mechanical properties, corrosion resistance, and thermal stability. Following this framework, we offer A105 carbon steel (general), F316 stainless (chemical), and LF2 (low-temp) options so you never over-specify or under-engineer.
Where Our 3 Threaded Flanges Deliver Measurable Value
From upstream oil & gas to food-grade processing — here's how procurement teams across the USA, Europe, and the Middle East deploy our flanges.
🛢️
Oil & Gas Transfer Lines
Class 300 threaded flanges in A105 for hydrocarbon handling. One Texas operator reduced seal failures by 47% after switching to our precision-faced flanges.
🏭
Chemical Processing Plants
F316 stainless threaded flanges in corrosive media. Our material selection matrix aligns with the Cureus 2025 framework, helping a German chemical plant extend flange service life by 3.2× in chloride-rich environments.
🚰
Water Treatment & Desalination
NSF-compliant threaded flanges for potable water and brine lines. A desalination project in the UAE achieved zero flange leaks in 18 months of continuous operation.
Inside the Factory: Quality You Can Audit
Cangzhou Weihuan Pipeline Equipment Co., Ltd. — a platform-based supply chain enterprise with professional sales and quality teams.
CNC Thread Lathe Line
Taper thread accuracy within 0.02mm, verified by NPT thread plug gauges on every 50th piece.
Hydrostatic Test Station
100% of 3 threaded flanges are pressure-tested at 1.5× rated working pressure before shipping.
Spectrometer Lab
PMI (Positive Material Identification) on every heat lot. Chemical composition report included with the MTC.
Export Packing & Loading
Heavy-duty wooden crates with rust-proof VCI lining. Container loading videos provided for every order.
Trusted by Engineering & Procurement Teams Worldwide
We've exported 3 threaded flanges and complete piping packages to 20+ countries including the USA, Russia, Canada, Kazakhstan, Algeria, UAE, and across Europe.
"We sourced 3 threaded flanges from Weihuan for a refinery upgrade in Houston. The MTC documentation was spotless, threads gauged perfectly, and we cut our flange procurement cost by 31% compared to our previous US distributor."
Mark Sullivan
Senior Procurement Manager, Texas Refining Co.
"The F316 stainless 3 threaded flanges we ordered for a chemical plant in Rotterdam have been in service for 14 months with zero leaks and zero corrosion issues. Their material certifications are fully traceable to the mill."
Dr. Anke Weber
Technical Director, ChemNord AG, Germany
"Weihuan consolidated our entire piping package — flanges, elbows, tees, reducers — into one shipment to Kazakhstan. The landed cost was 27% lower than buying from three separate suppliers, and delivery took only 18 days."
Timur Aliyev
Operations Manager, Caspian Pipeline Services
"Their OEM capability is outstanding. We needed a custom face finish on 3 threaded flanges for a cryogenic application, and Weihuan delivered a 160-grit Ra 0.8µm finish — better than our spec. Quick and professional."
James O'Connor
Supply Chain Director, LNG Facilities Ltd., UK
💬 Real Conversations with Our Customers
FAQ: Your 3 Threaded Flange Questions, Answered
Q1: What's the difference between a 3 threaded flange and a weld-neck flange?
A: A 3 threaded flange connects to the pipe via NPT/BSPT threads — no welding required. This makes it ideal for high-pressure systems where hot-work permits are restricted, or for galvanized piping that can't be welded. Weld-neck flanges offer a stronger joint for extreme pressures but require skilled welders and inspection. Our threaded flanges are rated up to 50.7 bar (Class 300), making them suitable for most industrial water, oil, and gas lines.
Q2: Can I get a 3 threaded flange in stainless steel?
A: Absolutely. We offer ASTM A182 F304, F304L, F316, and F316L stainless steel threaded flanges for corrosive and hygienic applications. Each flange is PMI-tested and comes with a full material certificate. For chemical plants and food processing, this is our most requested option.
Q3: What is the minimum order quantity (MOQ)?
A: Our standard MOQ for 3 threaded flanges is 50 pieces per size/class for stock sizes. For OEM or custom-spec orders, MOQ is 100 pieces. We also offer sample orders (1–5 pieces) at sample pricing, fully refundable against your first bulk order.
Q4: How does shipping work for USA and Europe? What are the freight costs?
A: We ship via sea freight (FOB/CIF/DDP) or air freight depending on your timeline. For a 500kg order of 3 threaded flanges to Houston, sea freight typically costs $250–$400 per cubic meter; air freight is faster but more expensive. We consolidate multi-item orders to maximize container utilization and reduce your per-unit shipping cost.
Q5: What payment terms do you offer?
A: For first-time orders, we accept T/T (30% deposit, 70% before shipment) or L/C at sight. For repeat customers with a solid order history, we can offer net-30 or net-60 terms on approved credit. We also support payment via letter of credit through major international banks.
Q6: Can you provide custom thread types or special dimensions?
A: Yes. We offer BSPT, BSPP, and NPT threads across all sizes. Custom bore diameters, face finishes (up to Ra 0.4µm), and hub lengths are available through our OEM/ODM program. Engineering drawings and 3D models can be provided for your review within 48 hours.
Q7: What after-sales support do you provide?
A: Every order includes a 12-month warranty against manufacturing defects. Our technical engineering team provides free installation guidance and torque specifications. We respond to any quality claim within 24 hours and ship replacements within 15 days.
Q8: How do you ensure thread quality is consistent across large orders?
A: Our CNC threading centers maintain a tolerance of ±0.02mm on thread pitch and ±0.5° on taper angle. Every production batch is sampled using L-1 and L-2 NPT thread gauges. We also provide video recordings of thread inspection for your QA team if requested.
✅ What Engineers & Buyers Say After Working With Us
⭐️⭐️⭐️⭐️⭐️
"Ordered 250 pieces of 3 threaded flanges Class 150 for a water treatment upgrade. The threads are smooth, gaskets seat perfectly, and the price was 30% below our previous vendor. Will definitely reorder."
— Robert Fields, Plant Engineer, Michigan USA
⭐️⭐️⭐️⭐️⭐️
"The MTC documentation was the most complete I've seen from an Asian supplier. Heat numbers, mill certs, hydro test reports — everything matched. Our audit team was impressed."
— Charlotte Dupont, QA Manager, Lyon France
⭐️⭐️⭐️⭐️⭐️
"Delivery in 14 days from order to Dubai port — faster than our local distributor. The 3 threaded flanges paired perfectly with our MCI fittings package. Great one-stop supplier."
— Omar Al-Farsi, Projects Director, Dubai UAE
About the Author
David Chen
Senior Piping & Flange Engineering Consultant at Cangzhou Weihuan Pipeline Equipment Co., Ltd. With 14 years of experience in international pipeline fittings manufacturing and supply chain management, David has helped 200+ procurement teams across 20 countries source compliant, cost-effective flange solutions. He is a member of the ASTM International Committee F25 on Shipbuilding and a regular contributor to industry piping design forums.
🔧 Ready to Cut Your Flange Costs Without Cutting Corners?
Get a free 3D model + engineering review for your piping network. Our team responds within 24 hours with a detailed quotation, lead time, and compliance documentation.
✓ Free samples available
✓ 12-month warranty included
✓ DDP shipping to USA/Europe
✓ OEM/ODM customization welcome
📧 Email: whxs@weihuantube.com | 📞 Phone: +86 18531701777
📍 Address: Middle section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province, China
🔒 We respect your privacy. Your inquiry is protected by our #?→ Privacy Policy & GDPR compliance.
© 2026 Cangzhou Weihuan Pipeline Equipment Co., Ltd. All Rights Reserved. | ISO 9001:2015 Certified | CE & ANSI/ASME Compliant
3 Threaded Flange • 3 Threaded Flanges • Piping Flange Solutions • Malleable Cast Iron Fittings • Steel Pipe & Pipe Elbow Exports
More from this supplier
Cangzhou Weihuan Pipeline Equipment Co.,Ltd.
