Explore our premium zinc and aluminum alloy die cast assemblies engineered to global OEM tolerances.
As modern engineering and high-volume industrial sectors demand lighter, stronger, and more dimensionally precise metal parts, High-Pressure Die Casting (HPDC) has emerged as a crucial manufacturing technology. At Ningbo Huazhu Precision Machinery Co., Ltd. (originally founded in 2007 as Tiezhu Hardware Factory and rebranded in 2015), we represent the peak of OEM/ODM contract manufacturing in China, specializing in complex zinc and aluminum alloy castings, high-end surface finishes, and custom hardware accessories.
For more than 18 years, our engineering team has developed customized parts for structural designs, high-end architectural hardware, and premium bath/plumbing components. Operating a state-of-the-art facility equipped with horizontal cold-chamber and hot-chamber die casting machinery, we bridge the gap between initial mold design and complete surface treatment, shipping high-durability products to OEMs, tier-1 suppliers, and industry-leading global brands across Europe, North America, and Japan.
Why sourcing from Ningbo, China ensures unmatched scale, speed, and cost-efficiency.
Equipped with an internal mold workshop, our engineers utilize advanced CAD/CAM software and Mold Flow Analysis to finalize configurations. Custom mold opening processes take only 28-35 days, drastically accelerating product time-to-market compared to Western casting facilities.
We control the entire value chain: mold design, high-pressure die casting, precision CNC machining, multi-stage manual and automatic polishing, electroplating, surface spraying (powder coating, liquid painting, PVD), 100% optical/dimensional inspection, and custom packaging under a single roof.
Based in Ningbo, Zhejiang province, we sit at the core of the global marine shipping network. Immediate proximity to the Port of Ningbo-Zhoushan, one of the busiest deep-water ports globally, reduces transit expenses, simplifies shipping customs protocols, and ensures predictable supply chains.
High-pressure die casting relies heavily on metallurgical expertise and precision process controls. At Ningbo Huazhu, our equipment lines process premium zinc alloys (Zamak 3, Zamak 5, Zamak 8) and aluminum alloys (A380, A360, ADC12). Our tooling design optimizes molten metal flow, velocity, and pressure profiles to eliminate internal porosities, shrinkage cracks, and structural defects.
Following casting, our machining workshop handles secondary tasks with strict accuracy. Leveraging automated CNC machining centers, precision drilling machines, and tapping rigs, we maintain structural tolerances as narrow as 0.02 mm. This satisfies rigorous aerospace, automotive, and clean-room specifications for high-use components.
Additionally, we lead the industry in surface finishing treatments. Our electroplating, powder coating, and PVD processes protect components from moisture, salt air, and chemical cleaners. We run automated test processes to ensure corrosion resistance ranging from standard neutral 240H salt spray tests (NSS) up to 480H for demanding marine and luxury sanitary environments.
Ideal for complex, thin-walled parts requiring outstanding dimensional stability and superior plating aesthetics. Excellent choice for custom shower glass clamps, structural brackets, faucet handles, and window levers.
Delivers high strength-to-weight ratios, high corrosion resistance, and thermal dissipation properties. Commonly used for structural aluminum profiles, door chassis plates, window frames, and heavy-duty brackets.
Equipped with high-precision coordinate measuring machines (CMM), optical projectors, salt spray chambers, and plating thickness gauges. We carry out inspection workflows throughout manufacturing run cycles.
Ensuring absolute protection for international Intellectual Property and strict quality compliance.
Global procurement directors and supply chain managers look beyond unit pricing when selecting an OEM partner; they require risk mitigation, predictable communication, and alignment with modern regulations. At Ningbo Huazhu, we operate a dedicated technical sales desk that communicates fluently in English, providing real-time feedback on DFM (Design for Manufacturing) reports, structural tweaks, and logistics updates.
We recognize the vital importance of protecting intellectual property in contract manufacturing. Our facility utilizes secure IT protocols and strictly isolates customer-supplied engineering files. We sign formal NDAs (Non-Disclosure Agreements) with all clients, ensuring custom molds and proprietary component designs remain strictly confidential.
Additionally, our factory processes comply fully with environmental directives such as RoHS and REACH. We source certified raw alloys with verified trace elements, ensuring safe, toxic-free products suitable for high-end residential bath installations, medical systems, and consumer appliances globally.
Driving innovation in structural cast parts and smart home architectural hardware.
Modern luxury bathrooms demand flawlessly electroplated and PVD-finished items. Our cast zinc and stainless steel hinges, brackets, soap baskets, and shower rail components achieve mirror-like finishes that resist moisture and harsh detergents without pitting or peeling.
With IATF 16949-compliant quality controls, we supply structural brackets, housing shells, window handles, and heavy duty hinges that meet high mechanical stress requirements, weight minimization, and consistent fatigue resistance profiles.
Heavy duty window handles and high-performance sliding door systems demand high wear resistance. We manufacture customized handles and hinges designed to withstand high daily cycle operations while retaining clean surface styles.
Technical answers to critical questions from OEM engineering and procurement departments.
For zinc alloys casting (using H13 hot-work steel), mold life ranges from 500,000 to over 1,000,000 shots due to zinc's low melting point. Aluminum alloy tooling typically lasts between 100,000 to 150,000 shots. We carry out routine preventative maintenance on all active customer tooling stored in our mold workshop at no extra charge.
We use computer-aided Mold Flow Analysis to optimize runner placement and ventilation overflows. Precise regulation of shot speeds, injection pressures, and cooling cycles in our automated machines ensures dense castings. We verify this via regular radiographic testing and structural density spot-checks.
Our standard high-pressure die casting tolerances align with ISO 8062 Grade CT6. Following CNC precision machining, we maintain tighter mechanical feature tolerances down to +/-0.02 mm, which is ideal for assembly-ready bathroom fittings, hinges, and industrial connectors.
Yes, our in-house surface treatment division performs multi-stage manual polishing, electroplating (Chrome, Nickel, Brass, Copper), powder coating, and Physical Vapor Deposition (PVD). This allows us to offer specialized finishes like Brushed Nickel, Matt Black, Satin Chrome, and PVD Gold.
Every batch of incoming zinc and aluminum alloy receives chemical composition analysis using our in-house optical emission spectrometer. We only use verified high-purity Zamak and aluminum ingots, ensuring compliance with both RoHS and REACH regulations. We provide chemical certificates with every shipment.
We supply high-performance parts to global sanitary and hardware companies.
Collaborating with industry leaders such as Germany Dornbracht, Japan TOTO, Italy INDA, and Spain ROCA to manufacture complex custom parts under strict tolerance controls.
Additional die cast assemblies and premium surface products available for OEM sourcing.
Send your CAD drawings (STEP, IGES, or DWG formats) directly to our engineering desk. Our experts will evaluate the design files and provide a detailed price quote and feasibility report within 24 hours.
Huazhu