The first step is to prepare your product documentation-the foundation for any custom project. Ideally, provide 3D files (STEP or IGS format) alongside 2D engineering drawings (DWG or DXF). The 2D drawings should clearly specify dimensional tolerances, hole locations, bending directions, and surface finish requirements. If complete drawings are not yet available, you may send a physical sample; we can perform 3D scanning and reverse engineering to generate the necessary technical drawings. However, you will still need to verify the resulting data to ensure it aligns with your original assembly requirements. Please note that relying solely on photographs makes it difficult to guarantee precision; therefore, we generally advise against proceeding directly to production based on images alone.
Next, you must confirm the core technical parameters-a critical step that is best handled thoroughly from the outset. First, specify the material: we most frequently work with cold-rolled steel, galvanized steel, aluminum alloys, and 304 or 316L stainless steel. Less common materials, such as copper or spring steel, may also be used; the choice of material directly influences corrosion resistance, load-bearing capacity, and manufacturing complexity. You should also specify the material thickness-we are well-equipped to handle the standard range of 0.5mm to 12mm, while projects involving exceptionally thin or thick materials will require a preliminary process assessment. Furthermore, define your tolerance requirements. For small, precision components, we can achieve tolerances as tight as ±0.05mm; for larger sheet metal parts, tolerances are typically broader due to factors like welding and bending-induced deformation. We will always provide a realistic assessment of what is achievable rather than making promises we cannot keep. Additionally, please indicate if any secondary operations-such as self-clinching (press-in) fasteners, countersunk holes, tapping, or rivet-stud installation-are required, as these processes significantly impact the final quotation.
Finally, clarify the intended operating environment and surface finish requirements. Providing a brief description of the equipment where the part will be used-whether it is for an indoor electrical enclosure, a humid or salt-spray-exposed environment, or an application requiring food-grade hygiene standards-is essential. There are many surface finish options available. For stainless steel, common choices include brushing, sandblasting, and electropolishing; aluminum is typically anodized; and carbon steel is usually powder-coated, galvanized, or black-oxidized. Electropolishing offers a higher hygienic standard and is easy to clean, making it ideal for pure water systems, food processing, and medical equipment-though it comes at a higher cost than standard brushing. If you are unsure which to choose, we can provide practical recommendations based on your specific operating environment, without pushing for unnecessarily expensive processes.
Once we have received all the necessary documentation, our team conducts a technical review. Our engineers examine factors such as bending interference, the validity of flat-pattern layouts, and the risk of welding-induced deformation. They determine where stiffeners are needed to prevent warping and which holes should be machined prior to the bending process. Following this review, we provide a quote, an estimated lead time for prototyping, and suggestions for process optimization. Sometimes, a design may be perfectly functional for assembly but costly to manufacture via sheet metal fabrication; in such cases, we propose minor adjustments to reduce costs without compromising the product's intended function-naturally, all such changes are subject to your approval.
Upon confirmation of the quote and the proposed plan, we proceed to the prototyping stage. Most of our overseas clients opt for small-batch prototypes, which are used for on-site assembly testing to verify hole alignment, clearances, and overall appearance. You may provide feedback on the samples, and we will refine the drawings and produce updated prototypes until all assembly requirements are met. Please note that the unit cost for prototypes is generally higher than that for full-scale production; pricing for large-volume orders will be recalculated accordingly.
Once the samples are approved, we move to mass production. We perform a "first-article inspection" against the drawings before proceeding with full-scale manufacturing. Throughout the production run, we conduct spot checks on dimensions and appearance. For welded components, we focus on controlling deformation and weld quality, while for powder-coated parts, we monitor color consistency and coating thickness. If your order requires specific documentation, we can provide material certificates and inspection reports; we are also fully equipped to prepare the necessary supporting documentation for projects destined for the EU market.
The final stage involves packaging and shipment via sea freight. Sheet metal parts are prone to scratching; therefore, painted or polished surfaces are covered with protective film, and smaller components are separated using bubble wrap to prevent them from bumping into or scratching one another. For large-volume or heavy shipments, items are secured onto wooden pallets, making them suitable for containerized ocean freight. Shipping marks and outer carton labels can be customized precisely according to your templates, streamlining your warehouse receiving and distribution processes for various project sites.
I would also like to address a few frequently asked questions. We do not have a rigid minimum order quantity (MOQ) and are happy to accommodate small-batch trial orders-though please note that smaller quantities result in a higher per-unit cost. Lead times depend on the complexity of the parts: simple bent components can be produced quickly, while parts requiring welding, painting, or complex internal cavities will naturally require more time. Furthermore, we offer both OEM and ODM services; for long-term, stable projects, we can also collaborate on process optimization to ensure consistent supply.
If you are planning to initiate a custom precision sheet metal project, please send us your drawings or samples, along with specifications for the material, tolerances, surface finish, and estimated demand. We will promptly conduct a process evaluation and provide you with a clear quotation and production schedule. Should you have any technical questions regarding the manufacturing process, please feel free to reach out at any time.