Precision Manufacturing: 5-Axis CNC Machining, Injection Molds, and Rapid Prototyping Solutions.
Looking for a China casting manufacturer that can lower your part cost and shorten lead time? SPI Super-Ingenuity provides metal cast parts made in sand molds, delivering aluminum, iron and steel castings with tight tolerances and full engineering support from DFM to final machining.
Ideal for rapid prototypes and low-volume production for automotive, EV, robotics, medical and industrial equipment, our foundry helps you launch faster while reducing total part cost compared with many Western foundries using sand molds.
What you get when you work with SPI:
24-hour quotation response · Free DFM & mold-flow review · NDA available on request
Key numbers at a glance
Factory-direct pricing and optimized sand casting processes help reduce your part cost.
Rapid tooling and 3D-printed sand molds for fast first articles.
Hexagon CMM and Cpk process control on critical dimensions.
Sand casting is a metal casting process where a reusable pattern forms a cavity in compacted sand, molten metal is poured into the mold, and after solidification the sand mold is broken to release the cast metal part. This method is ideal for complex, low-to-medium volume components at competitive tooling cost.
As one of the most flexible sand-mold casting methods, this process supports a wide range of alloys and part sizes, from prototype runs to low-volume sand casting production. A typical workflow includes pattern making, green sand or resin sand mold preparation, metal melting and pouring, cooling, and final cleaning or machining. Compared to many other casting technologies, it offers an excellent balance of tooling cost, design freedom and lead time.
Advantages of Sand Casting:
When sand casting is the right choice:
Best for:
Not ideal for:
Compared to die casting or investment casting, this approach is well-suited for industrial components where strength, cost efficiency and design flexibility are critical, and is often the most economical choice for prototypes and low-to-medium volumes.
At SPI, we don’t just manufacture parts — we deliver complete casting solutions from material selection and precision control to rapid prototypes and scalable production.
Our foundry services cover a wide range of alloys and metals. The table below highlights typical materials, their key benefits and common applications for prototype and low-volume projects made in sand molds.
| Material | Key Benefits | Typical Applications |
|---|---|---|
| Aluminum | Lightweight, corrosion-resistant and easy to machine. Good strength-to-weight ratio for many industries. | Automotive housings, gearbox covers, pump bodies, brackets and EV structural parts that require lightweight aluminum castings made in sand molds. |
| Stainless Steel | High strength, excellent corrosion resistance and hygienic surface properties. Suitable for harsh and demanding environments. | Food and medical equipment components, valve bodies, high-temperature brackets and stainless steel cast components used in corrosive conditions. |
| Carbon Steel | Cost-effective with high strength and toughness. Good weldability and wear resistance when required. | Industrial machine bases, gears, flanges, hubs and heavy-duty brackets for demanding industrial casting applications. |
| Magnesium | Ultra-lightweight with excellent strength-to-weight ratio. Helps reduce overall system mass. | EV battery housings, robotics arms, lightweight covers and structural components where every gram matters and magnesium castings offer the best balance. |
| Bronze & Brass | Excellent wear resistance and good machinability. Often used where sliding or rotational motion occurs. | Marine hardware, bushings, hydraulic fittings, bearings, valve components and other bronze / brass cast parts that require long service life. |
As a precision metal casting supplier in China specializing in sand molds, we use Hexagon CMMs, Nikon height gauges and controlled processes to keep your dimensions stable from prototype to repeat orders.
Whether you need a single prototype or ongoing production, SPI scales your program from one-off trials to stable low-volume supply.
Typical parts produced at SPI range from 50 g to 30 kg with dimensions up to 600 mm. As a low-volume manufacturer in China, we are an ideal partner for prototype runs, bridge-to-production programs and long-term spare parts.
Our manufacturing workflow using sand molds follows five controlled steps, from DFM review to final inspection. If you are wondering how the process works, the overview below shows how your part moves from 3D file to a fully machined cast component:
What you do: send your 3D (STEP/IGES) and 2D drawings (PDF/DWG) with material, quantity and target lead time so our engineers can review them.
What you do: review and approve the DFM suggestions and gating concept so we can lock the tooling design and start mold making.
What you do: confirm any special requirements for mechanical tests or metallurgical properties before we run the first casting trial.
What you do: confirm machining tolerances, datum scheme and finishing requirements so we can match your print and functional needs.
What you do: review samples and inspection reports, then approve for repeat production and ongoing sand casting shipments.
For complex applications such as robotic joints or EV battery housings, SPI can combine 3D-printed sand molds, sand casting and CNC machining into a single workflow. This reduces tooling risk, shortens development time and keeps all engineering and quality control under one roof.
What you do: share your target launch date and volume so we can propose the right mix of prototype, bridge and production processes.
For more details on available finishes such as anodizing, powder coating and passivation, explore our surface finishing guide .
Our custom casting services in China support demanding applications across multiple sectors worldwide. Below are typical components and the advantages SPI brings to each industry.
| Industry | Typical Components | Our Advantage |
|---|---|---|
| Automotive & EV | EV motor housings, inverter & controller covers, engine and transmission brackets, suspension and chassis mounts for powertrain and e-mobility platforms. | Lightweight, cost-efficient cast parts for EV and automotive applications, optimized for strength, weight and cost. |
| Aerospace | Impellers, turbine support brackets, structural mounts, housings for auxiliary systems and ground-support equipment that require reliable performance. | High-strength alloys, tight tolerances and robust traceability for critical aerospace casting projects where safety and documentation matter. |
| Medical Devices | Imaging equipment frames, sterilizable housings, precision brackets and tooling fixtures used in diagnostic and treatment systems. | ISO 13485-ready processes, clean and repeatable surface finishes, and material traceability for medical-grade cast components. |
| Robotics | Robot arms and joints, sensor housings, end-of-arm tooling, structural frames and bases for industrial robots and automation systems. | Precision robotics prototypes and low-volume cast parts, enabling fast design iterations and stable serial supply. |
| Industrial Equipment | Gearboxes, pump housings, compressor bodies, machine bases, valve bodies and other rugged components for harsh environments. | Large-format castings up to 30 kg, including sand-mold pump housings supplied to Japanese and European OEMs, with durable and cost-effective performance. |
By focusing on performance, durability and total cost efficiency, SPI is a trusted manufacturing partner for parts produced in sand molds for global OEMs and Tier-1 suppliers.
When selecting a sand casting supplier in China, cost, quality and delivery speed are critical. SPI is designed to deliver all three for prototype and low-volume sand casting programs.
Unlike many trading companies or standalone foundries, SPI combines in-house sand casting, CNC machining and metrology under one roof. This reduces hand-offs, shortens lead time and gives you a single responsible partner in China for quality, cost and delivery.
SPI currently supports Tesla suppliers, Kyocera automotive fasteners, and leading Japanese precision manufacturers — helping them cut sand casting costs by up to 30% while maintaining strict automotive and electronics quality standards.
Unlike standalone foundries, SPI integrates 5-axis CNC machining with sand casting, helping you achieve tighter tolerances, fewer setups and reduced post-processing cost per part.
Your project will be handled by a dedicated core team in China. Each person below owns a clearly defined part of the process, so you always know who is responsible for DFM, casting design, foundry operations, communication and quality.
This services page is authored by the SPI Sand Casting Engineering Team
and reviewed by Kevin Liu (Engineering Lead) and
An Wang (Quality Engineer).
Last reviewed: May 2025
Kevin leads DFM and casting design optimization. He reviews your 3D/2D files, defines gating and riser layouts, selects suitable alloys and casting methods, and uses solidification know-how to minimize porosity and defects, ensuring stable, repeatable production for your sand cast parts.
Guoke coordinates mold making, melting, pouring and shake-out, as well as machining and shipments. He prepares timing plans, tracks daily production status and organizes trial reviews, keeping you updated in clear English as your single point of contact throughout the sand casting project.
An defines inspection plans and quality standards for your sand cast parts, including key dimensions, sampling levels and cosmetic criteria. She oversees CMM reports, capability studies (Cpk), NDT where needed, and final inspection so every shipment meets your specifications and quality requirements.
Our foundry and machining facility is ISO 9001 and IATF 16949 certified, and has delivered cast and machined metal parts made in sand molds to customers across Europe, North America and Asia.
We combine controlled processes in the foundry with CNC machining, measurement systems and documented work instructions to support automotive, EV, robotics, medical and industrial customers who require consistent quality and on-time delivery.
Learn more on our
About SPI Super-ingenuity page,
or see our
Quality Assurance
system in detail.
As a custom metal casting supplier in China, SPI helps global OEMs and Tier-1s reduce cost, shorten lead time and improve quality. Below are four real projects showing how our team turned challenging requirements into measurable results for EV prototypes in the USA, magnesium pump housings in Japan, robotic components in Germany and stainless steel medical enclosures in the USA.
See how we reduced cost and improved lead time in full project detail in our dedicated case study.
View Full Case Study
Have questions about working with SPI for parts produced in sand molds? The answers below cover our lead times, capabilities, file formats, quality control, shipping, low-volume MOQ and sample policy.
Still have questions about sand casting with SPI?
Ask an Engineer & Get AdviceGetting started is simple. Follow the steps below so our team can provide an accurate, fast quotation for your parts.
Upload your 3D CAD (STEP / IGES / Parasolid) and 2D drawings (PDF / DWG) showing key tolerances, surface finish and any GD&T requirements.
Share material, prototype quantity, expected annual volume, target lead time, surface finish and any special certifications (PPAP, RoHS, FDA, etc.).
Our engineers review your design and send DFM feedback, highlighting cost-saving opportunities and potential risk areas before we finalize a quote.
You receive a clear quotation including tooling cost, unit price per quantity level and estimated lead time for both prototype and production orders.
Once you approve the quote, we start tooling immediately. Samples can be delivered in as fast as 7–10 days, depending on the project.
Ready to cut your casting costs and shorten lead times? Upload your 3D/2D files and our engineers will send you a detailed quotation within 24 hours, including DFM suggestions and cost-saving options. NDAs are available on request to protect your design.
In addition to the support from SPI’s engineering team, you may find the following independent resources useful when learning more about sand systems, casting design rules and industry best practices:
These third-party resources complement SPI’s own design-for-manufacturing feedback and help your team align part design with proven sand-mold casting practices used worldwide.
Share your drawings, 3D files, and quantity, and our engineering team will come back with a clear sand casting quote and lead time for your parts.
