Discount Custom Stub End Flanges
Precision-forged stub end flanges designed for lap joint connection systems. Available in any size and alloy specification with full EN 10204 3.1 certification.
View Product DetailsExplore our export-ready forged carbon steel, alloy, stainless, and precision-machined brass-compatible piping flange components certified for high-pressure installations worldwide.
Precision-forged stub end flanges designed for lap joint connection systems. Available in any size and alloy specification with full EN 10204 3.1 certification.
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Engineered for fast alignment and low installation cost in moderate pressure piping loops. Precision machined inner bore for optimal pipe fitment.
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Ideal for systems requiring frequent dismantling or bolt hole alignment. Economical backing flanges paired with stub ends for non-corrosive outer jointing.
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Direct OEM manufacturing to international standards (ASME, EN, DIN). High-density forged structure eliminating internal porosity and fluid micro-leaks.
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Fully compliant with ASME B16.5 and EN 1092-1 pressure classes. Heat-treated and surface-treated for maximum longevity in harsh industrial environments.
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CNC drilled and high-precision machined tube sheets for heat exchangers, condensers, and pressure vessels. Full metallurgy inspection guaranteed.
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Large-diameter forged weld neck flanges built for heavy-duty gas mains, oil pipelines, and power stations requiring high cyclic load resistance.
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Corrosion-resistant, cost-effective forged piping joints for chemical plants, water distribution lines, and industrial processing systems.
View Product DetailsA comprehensive analysis of why precision-machined brass threaded flanges serve as indispensable fluid connectors across high-specification industrial and commercial networks.
A brass threaded flange (also referenced as a companion flange or screwed pipe flange) is a specialized mechanical joint component manufactured from copper-zinc alloys. Unlike welded flanges that require high-temperature thermal joinery, a threaded flange features an internal tapered or parallel female thread (such as NPT, BSPT, or BSPP) that screwdrives directly onto externally threaded pipe ends. Designed to meet standards like ASME B16.24 (Cast Copper Alloy Pipe Flanges) and ASME B16.5 dimensional patterns, brass threaded flanges provide robust, pressure-tight seals while enabling rapid, non-destructive assembly and maintenance access in non-weldable environments.
While carbon steel and stainless steel excel in ultra-high-pressure steam or heavy hydrocarbon duties, brass and copper alloys dominate applications demanding superior anti-galling, non-sparking (ATEX safety), biofouling resistance, and low thermal expansion variance against copper tubing. Brass exhibits exceptional natural resistance to atmospheric oxidation, bio-film growth, and non-oxidizing acids. Furthermore, in potable water distribution, modern lead-free brass formulations guarantee total compliance with strict global toxicity standards while avoiding the stress-corrosion cracking (SCC) vulnerable to standard austenitic stainless steels in chlorinated environments.
Information Gain Key Insight: Threaded joint performance is governed by metallurgical ductility and thread pitch conformity. Forged brass flanges provide up to 35% higher tensile strength and 50% greater impact fatigue resistance compared to traditional sand-cast brass fittings, completely eliminating micro-porosity leakage under cyclic thermal stresses.
Selecting the optimal brass alloy is paramount to preventing premature joint degradation, dezincification, or galvanic galvanic erosion. Below is the technical breakdown of primary forging brasses utilized by Shanxi Yuxin Casting & Forging Co., Ltd.:
| Alloy Designation | UNS / EN Standard | Nominal Composition | Mechanical Properties | Target Engineering Application |
|---|---|---|---|---|
| Forging Brass | UNS C37700 / CW617N | Cu 59-61%, Pb 1.5-2.5%, Zn Rem. | Tensile ≥ 440 MPa, Yield ≥ 230 MPa | General plumbing, HVAC headers, medium-pressure hydraulic lines. |
| Free-Cutting Brass | UNS C36000 / CW614N | Cu 60-63%, Pb 2.5-3.7%, Zn Rem. | Tensile ≥ 380 MPa, Hardness 120 HB | High-precision CNC threaded companion flanges & instrument hubs. |
| Naval Brass | UNS C46400 / CW712R | Cu 59-62%, Sn 0.7-1.5%, Zn Rem. | Tensile ≥ 480 MPa, Corrosion Resistant | Marine seawater cooling loops, offshore platforms, shipboard piping. |
| Dezincification Resistant (DZR) | UNS C35300 / CW602N | Cu 61-63%, As 0.02-0.15%, Zn Rem. | ISO 6509 Depth < 100 µm | High-temperature domestic hot water, aggressive soft water lines. |
| Eco Lead-Free Brass | UNS C46500 / CW511L | Cu 59-65%, Pb ≤ 0.09%, Si/Sn Trace | NSF/ANSI 61 & 372 Compliant | Municipal drinking water distribution, food-grade processing loops. |
From high-rise mechanical rooms to offshore propulsion units, examine how our precision brass threaded flanges deliver zero-leak service across challenging environments.
In high-density commercial complexes and municipal water treatment facilities, brass threaded companion flanges serve as the vital interface between backflow preventers, booster pump skids, and copper piping trees. Utilizing Lead-Free C46500 Eco Brass, these flanges prevent heavy metal leaching into drinking water, fully meeting NSF/ANSI 61 and EU Drinking Water Directive 2020/2184 standards while suppressing bio-film accumulation.
Dual-pipe heating, ventilation, and air conditioning systems experience continuous thermal expansion and contraction cycles. Forged brass screwed flanges installed on heat exchanger manifolds and chiller headers absorb vibration while providing a robust gasket seal. Their natural acoustic damping properties minimize noise transmission through building structural risers compared to rigid steel connections.
Naval vessel engine rooms, commercial cargo ships, and offshore platform desalination plants operate under aggressive marine atmospheres. C46400 Naval Brass threaded flanges modified with tin addition actively resist dealumination and dezincification in saline environments. They connect hull valves, bilge pumps, and sea chest strainers where non-ferrous, non-corroding flanges are mandatory.
In food processing facilities, textile mills, and pharmaceutical cleanrooms, low-pressure condensate return and clean steam lines utilize brass threaded companion flanges. Brass eliminates rust flaking into delicate process streams. When paired with high-temperature PTFE or metallic spiral wound gaskets, screwed brass flanges maintain seal integrity across rapid pressure fluctuations up to 300 PSI.
Petrochemical refuelling bays, LPG distribution skids, and natural gas metering stations require non-sparking mechanical joints to eliminate explosion risks during maintenance ratcheting. Forged brass threaded flanges provide anti-spark security per ATEX Zone 1/21 requirements, preventing friction ignition while ensuring gas-tight NPT thread interference fits.
Global original equipment manufacturers (OEMs) of liquid metering pumps, water filtration units, and hydraulic power packs specify custom brass threaded flanges. Direct thread connection to valves or flowmeters eliminates costly extra pipe nipples, reducing assembly footprint and structural weight in compact equipment enclosures.
Strategic technological advances redefining precision metallurgical forging, thread geometry verifications, and sustainable green manufacturing standards.
Global regulatory pressure (such as US Safe Drinking Water Act and EU RoHS/REACH mandates) is accelerating the complete transition from traditional leaded brasses to silicon and bismuth-modified eco-brasses (UNS C46500 / CW511L). Shanxi Yuxin's R&D technology roadmap focuses on optimizing hot-forgeability parameters for lead-free alloys, compensating for altered shear flow behavior while maintaining superior free-machining chip breaking performance.
Thread pitch micro-deviations cause localized stress concentration and helical leak paths. Modernized production utilizes multi-spindle CNC lathes equipped with live tooling to cut ASME B1.20.1 NPT and ISO 7-1 BSPT threads in a single clamping setup. 100% inline 3D laser scanners verify thread taper, crest radius, and pitch diameter tolerances against digital CAD models in real time.
Replacing manual visual checks, AI-driven non-destructive testing (NDT) platforms scan 100% of forged brass flange blanks. High-frequency eddy current coils detect subsurface micro-cracks, inclusions, or un-recrystallized grain boundaries down to 50 microns. Artificial intelligence algorithms classify defect signatures, automatically rejecting non-conforming billets prior to machining.
For aggressive soft water or high-temperature district heating applications, post-forge heat treatment is crucial. Our proprietary thermal annealing process stabilizes the alpha-phase brass crystal matrix, controlling arsenic or antimony micro-alloying distribution. This heat-treatment protocol ensures compliance with ISO 6509 dezincification testing with corrosion depths well under 100 micrometers.
Unlocking unmatched manufacturing scale, raw material vertical integration, and cost-effective export logistics from China's premier forging industrial cluster.
Located in Dingxiang County, Shanxi—globally designated as the “Hometown of Forging in China”—Shanxi Yuxin Casting & Forging Co., Ltd. operates at the center of an integrated industrial cluster. This proximity grants direct, immediate access to high-purity copper/zinc ingots, specialized die-making shops, thermal treatment facilities, and accredited testing laboratories, eliminating regional supply bottlenecks.
Unlike trading entities that source piecemeal components from disparate sub-tier workshops, every Yuxin flange is heated, forged, heat-treated, CNC-machined, and hydro-tested inside our own factory. The heat numbers stamped onto your delivered flanges directly cross-reference our EN 10204 3.1 Mill Test Certificates for complete chemical and mechanical peace of mind.
With an annual output capacity exceeding 10,000 tons of forged components, our plant balances high-volume standard runs with flexible OEM custom orders. Standard size blanks (1/2” to 24”) ship within 7 to 15 days, while engineered-to-drawing non-standard brass flanges are delivered in 20 to 35 days—significantly outperforming European or North American manufacturing lead times.
Technical reference guide for engineering procurement, specifying dimensional, thread profile, and pressure-temperature compliance parameters.
| Standard Body | Specification Code | Available Thread Forms | Nominal Size Range | Pressure Class Ratings | Primary Facing Types |
|---|---|---|---|---|---|
| ASME / ANSI | ASME B16.24 / B16.5 | NPT (ANSI B1.20.1) / NPS | 1/2" to 12" (DN15 - DN300) | Class 125, 150, 300, 600 | Flat Face (FF), Raised Face (RF) |
| EN / DIN | EN 1092-3 (Copper Alloys) | BSPT (EN 10226-1) / BSPP | DN15 to DN300 | PN6, PN10, PN16, PN25, PN40 | Type A (Flat), Type B (Raised) |
| JIS | JIS B2220 / B2240 | PT (RC) / PF (G) Threads | 10A to 300A | 5K, 10K, 16K, 20K | FF (Flat Face), RF |
| BS | BS 10 (Tables D, E, F, H) | BS 21 Taper Threads | 1/2" to 12" | Table D, E, F, H Ratings | Flat Face (FF) |
| Custom OEM | Client Drawing / DWG / STEP | Custom / ACME / Metric | Up to Ø 1500 mm | Custom Hydrostatic Tested | O-Ring Groove, T&G |
Browse additional specialized forged flange configurations manufactured at our Shanxi facility for severe-service global piping projects.
Heavy series weld neck flanges built for large bore pipelines. Engineered for high stress distribution in oil, gas, and energy processing units.
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Precision-drilled backing flanges designed to mate with rubber and metal expansion bellows. Absorbs thermal expansion and dampens pump vibration.
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High-pressure carbon and alloy lap joint flanges engineered for aggressive chemical transmission lines requiring frequent joint inspection.
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OEM factory-direct tube sheets for heat exchangers. Drilled on high-speed CNC centers to guarantee micro-inch tube hole tolerances.
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High-integrity Ring Type Joint (RTJ) flanges crafted for severe pressure and high-temperature upstream oilfield manifolds.
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Custom forged and machined tube sheets supported by complete 3D measuring arm inspection and non-destructive ultrasonic flaw detection.
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Concentric and eccentric reducer flanges engineered for smooth fluid transition between differing nominal pipe diameters.
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Counter-bored socket weld flanges for small-bore, high-pressure utility lines. Fast alignment and robust fillet weld integrity.
View Product DetailsDirect technical answers from Shanxi Yuxin's engineering department addressing thread compatibility, torque specs, DZR testing, and international export procedures.
NPT (National Pipe Taper) is defined per ANSI/ASME B1.20.1 and features a 60-degree thread flank angle with flat crests and roots. It relies on a 1:16 taper ratio where thread engagement creates a mechanical interference seal. BSPT (British Standard Pipe Taper), defined per ISO 7-1 / EN 10226-1, utilizes a 55-degree thread angle with rounded crests and roots. These two thread forms are not interchangeable. Screwing an NPT pipe into a BSPT brass flange will result in galling, incomplete thread engagement, and immediate joint leakage under pressure. Always verify destination system specs before ordering.
For municipal drinking water projects requiring compliance with NSF/ANSI 61 and NSF/ANSI 372 (as well as California AB 1953), Yuxin manufactures flanges from certified UNS C46500 Eco Brass or CW511L Lead-Free Alloys. We conduct Optical Emission Spectrometry (OES) chemical analysis on every heat batch, ensuring lead (Pb) content is strictly limited below 0.09% by weight. Material Test Reports (MTRs) detailing exact trace elements accompany each shipment.
Directly screwing a brass flange onto a carbon steel pipe in the presence of an electrolyte (such as untreated water or moist air) creates a galvanic cell, accelerating galvanic corrosion of the more anodic carbon steel. In closed HVAC or dry gas systems, direct pairing is common. However, for aqueous services, we recommend installing dielectric insulating flange kits (dielectric sleeves and washers) or utilizing short brass nipples to isolate dissimilar metals and prevent premature joint failure.
Every export shipment from Shanxi Yuxin includes a comprehensive documentation package: EN 10204 3.1 Mill Test Certificate detailing melt heat number, chemical composition, tensile/yield/elongation test results, hardness values, and heat treatment logs. Upon request, we also provide 3.2 Third-Party Inspection certificates (TÜV, SGS, Lloyd's Register), hydrostatic test reports, NDT ultrasonic inspection sheets, and Certificate of Origin (CO).
Dezincification is a selective corrosion process where zinc is dissolved out of brass alloys in soft, oxygen-rich, or high-temperature water environments, leaving a porous, structurally weak copper matrix prone to catastrophic weeping leaks. DZR brass alloys (such as CW602N / UNS C35300) contain trace arsenic inhibitors and undergo specialized thermal annealing. Our DZR brass flanges pass ISO 6509 testing, guaranteeing corrosion depths under 100 micrometers.
For standard ANSI B16.24 and EN 1092-3 brass threaded flanges held as forged blanks in stock, machining and export packaging require 7 to 15 calendar days. Custom forged-to-drawing OEM flanges normally require 20 to 35 days depending on die tooling requirements and specialized heat treatment cycles. We accept low MOQ trial orders to support engineering prototypes and distributor stock replenishment.