Near-Net-Shape Castings. Precision-Machined Features. Finished to Your Specification.
GPT Precision supplies custom aluminum, zinc and magnesium die-cast components, coordinating tooling, casting, CNC machining, surface finishing and inspection within a single project scope.
Die casting produces complex metal shapes with integrated features and relatively little material removal. Where the finished part requires tighter fits, controlled surface finishes or precise assembly interfaces, secondary CNC machining can provide the necessary accuracy.
From mold development to production and finished-part supply, we evaluate the manufacturing route around your drawing, material, quantity and acceptance requirements.
We also manufacture and supply die casting molds as a separate deliverable.
Complex geometry. Repeat production. Fewer assembled components.
Die casting is worth considering when a part's geometry, expected demand and design stability justify dedicated tooling.
Its value comes from more than the casting operation alone. The complete manufacturing route should deliver a component that meets its functional, dimensional and appearance requirements.
Ribs, bosses, mounting points and supporting structures can be incorporated into a single casting, potentially reducing separate components and assembly operations.
Engineering focus: Filling behavior, wall transitions, draft, ejection and secondary machining access.
A dedicated die can reproduce complex part geometry across planned production batches when the tooling and casting process are appropriately controlled.
Engineering focus: Tooling design, dimensional consistency, process stability and inspection requirements.
Near-net-shape casting can reduce the amount of machining required compared with producing the same geometry entirely from solid stock.
Engineering focus: Compare total tooling, casting, machining, finishing and inspection costs rather than machining time alone.
Features that would otherwise require separate brackets, fasteners or joined components may be integrated into the casting.
Engineering focus: Assembly interfaces, structural requirements, serviceability and tooling complexity.
Start with the component's function, then evaluate its casting geometry.
Die casting can be considered for a range of industrial components that combine formed geometry with functional interfaces.
The following are representative part categories for engineering evaluation.
Equipment housings, protective enclosures and mechanical bodies with internal pockets, mounting bosses or integrated supporting features.
Key considerations: Wall thickness, mounting interfaces, internal clearance, sealing surfaces and cosmetic requirements.
Mounting brackets, supports and structural bodies with integrated ribs, bosses and fastening features.
Key considerations: Load paths, stiffness, wall transitions, hole positions and assembly alignment.
Finned housings and components designed to support heat transfer or integrate thermal-management features.
Key considerations: Alloy thermal properties, fin geometry, filling behavior, surface treatment and functional performance requirements.
Cast bodies that require secondary machining for bearing bores, threads, sealing faces, locating features or other precision interfaces.
Key considerations: Machining allowances, datum selection, workholding, dimensional relationships and final inspection.
Material selection affects casting, machining and final performance.
The alloy should be selected according to mechanical requirements, working temperature, corrosion exposure, weight, dimensional needs and finishing specifications.
Casting process and equipment selection also depend on the alloy and component design.
Aluminum die casting commonly uses cold-chamber equipment, while zinc die casting commonly uses hot-chamber equipment. Magnesium may use either process, depending on the alloy and available equipment.
ADC12, A380, A383
Weight, mechanical properties, castability, thermal performance and finishing requirements
Zamak 3, Zamak 5
Casting behavior, mechanical properties, detailed geometry and surface-finishing requirements
AZ91D
Low weight, structural requirements, corrosion protection and process suitability
Provide the required alloy grade, applicable material standard and any specific mechanical or environmental requirements.
Alloy substitutions should not be assumed to be interchangeable. Differences in material properties, casting behavior, corrosion resistance and surface treatment may affect the finished part.
Grade availability, sourcing and manufacturing suitability are confirmed during project review.
Casting capacity and dimensional requirements are evaluated together.
GPT Precision supports die casting projects through in-house capabilities and manufacturing partners, with a combined production capability range covering machine capacities from 100 to 1,400 tonnes and part weights from 4 g to 15 kg.
These ranges describe available manufacturing coverage rather than a guarantee that every combination of alloy, size, weight and geometry can be produced.
The actual production route depends on the component design, alloy, projected quantities and acceptance criteria.
| Capability | Reference Value | Application Conditions |
|---|---|---|
| Aluminum as-cast linear dimensions | ±0.25 mm | Reference for dimensions up to 25.4 mm formed within the same die half; larger dimensions require additional tolerance allowance |
| Zinc as-cast linear dimensions | ±0.25 mm | Reference for dimensions up to 25.4 mm formed within the same die half; larger dimensions require additional tolerance allowance |
| Selected precision as-cast dimensions | ±0.05 mm | Certain dimensions up to 25.4 mm within the same die half, subject to suitable tooling, geometry, process control and verification |
| CNC-finished features | ±0.01 mm | Selected machined dimensions, subject to drawing, workholding, material and inspection review |
| Die casting machine capacity | 100–1,400 tonnes | Combined in-house and manufacturing-partner coverage |
| Die-cast part weight | 4 g–15 kg | Combined manufacturing coverage; alloy and geometry suitability reviewed individually |
As-cast tolerances are influenced by die design, part geometry, alloy behavior, thermal conditions and the relationship between formed features.
Dimensions crossing a parting line or involving slides, moving cores or other movable die components require separate assessment.
CNC machining may be selected for features that need closer dimensional control, improved geometric accuracy or specified surface finishes.
The figures above are capability references, not blanket tolerances for an entire casting. Final achievable tolerances, datum requirements and inspection methods are confirmed against the individual drawing.
The best results begin before the die is built.
Casting geometry, tooling design, machining allowances and final inspection should be reviewed as connected requirements.
A feature that is easy to form in the die may still require additional work to meet its finished dimensions. Likewise, a feature intended for machining must remain accessible and provide adequate material for the operation.
Review wall sections, ribs, bosses, radii and transitions between thick and thin areas.
Local thickness, flow length and geometry affect filling, solidification and the risk of casting defects.
Draft angles, parting lines, gate locations and ejector positions should be considered alongside functional and cosmetic requirements.
Visible surfaces, sealing interfaces and precision mounting areas may require specific restrictions.
Identify bearing bores, threads, locating holes, mounting faces and sealing surfaces that require secondary machining.
Machining allowances, accessible reference features and appropriate workholding influence the achievable finished geometry.
Define which dimensions may remain as cast and which require machining.
Specify the relevant dimensional and geometric tolerances, surface roughness, cosmetic standards and any internal-integrity or leakage requirements.
Casting is the starting point. The finished component is the deliverable.
Through our in-house capabilities and manufacturing partners, GPT Precision coordinates casting, secondary machining, surface finishing and inspection according to the agreed project scope.
After casting, gates, runners, flash and other excess material may require removal.
Specify acceptable gate remnants, edge conditions, burr limits and any restrictions on ejector marks or visible surfaces.
Secondary machining can produce critical bores, locating surfaces, threads, holes and sealing interfaces to the agreed dimensions and finishes.
The machining sequence considers datum relationships, fixture access, dimensional stability and the required verification method.
Blasting, polishing and other preparation methods may be used to achieve the required texture, appearance or condition for subsequent treatment.
Cosmetic surfaces should be distinguished from functional interfaces that require dimensional or surface protection.
Depending on the alloy and application, finishing options may include plating, pintura en polvo, painting and other compatible surface treatments.
Anodizing can be evaluated for suitable aluminum die-casting alloys. High-silicon alloys may present limitations in coating appearance and color uniformity, particularly where decorative requirements are demanding.
Specify coating type, thickness, appearance, masking areas and relevant performance standards.
Surface-treatment compatibility and supply arrangements are confirmed for the selected alloy and project.
Internal requirements must be defined before tooling and process planning are finalized.
Die-cast components may contain porosity or other internal discontinuities arising from the casting process.
Whether these conditions are acceptable depends on the component's function, location of the discontinuities and agreed acceptance criteria.
Internal discontinuities may be relevant to mechanical performance, machining results, sealing requirements or other specified functions.
Where needed, X-ray inspection can be arranged to evaluate defined internal areas according to an agreed inspection scope.
For parts that must retain pressure or prevent leakage, include:
Leak-tight performance depends on appropriate design, casting controls, finishing and verification. It should not be assumed from the die-casting process alone.
Porosity-sealing impregnation and air-tightness or leakage testing can be arranged where suitable for the application.
Impregnation must be permitted by the component specification and evaluated against its intended operating conditions.
Sealing treatments do not replace appropriate casting design, process control or agreed acceptance testing.
Inspection coverage, testing conditions, reporting requirements and any special internal-integrity criteria are confirmed during project review.
The meaningful comparison is the cost of an accepted component—not the casting price alone.
Die casting usually involves an initial tooling investment, followed by production and any required secondary operations.
For a realistic manufacturing comparison, consider the complete project scope.
Part consolidation may reduce separate components and assembly operations, but it can also increase tooling complexity.
The economics depend on the geometry, alloy, tooling investment, secondary processes and expected production volume.
There is no universal break-even quantity between die casting and CNC machining.
Provide initial quantities and anticipated repeat demand so alternative manufacturing routes can be compared using consistent finished-part requirements.
Die design, mold manufacture, initial trials and sample evaluation
Alloy, casting operations, production quantities and process requirements
Critical bores, threads, mounting faces and other finished features
Preparation, coatings, treatments and appearance requirements
Dimensional verification, internal inspection, leakage testing and documentation
Any specified assembly work, packaging and delivery requirements
Production molds and separately supplied die casting tools.
GPT Precision manufactures die casting molds for production programs and can also deliver completed molds as a separate supply scope.
Tooling design, manufacture, maintenance and ownership responsibilities are established according to the project requirements.
Customer-funded molds become customer property once the agreed mold fee has been paid in full.
Tool ownership and related rights are documented in the applicable tooling agreement.
We maintain molds retained with us for production.
Maintenance responsibilities, storage arrangements, repair conditions and mold transfer requirements are defined in the tooling agreement.
Where customer-requested design changes require mold modifications, the associated modification costs are borne by the customer.
The effect on tooling, samples, production and acceptance requirements is reviewed before the changes are implemented.
Expected mold life depends on the mold design, casting alloy, production requirements and operating conditions.
The project-specific tool-life commitment is stated in the quotation and related agreement rather than represented by one universal shot count.
Completed die casting molds can be supplied independently of an ongoing casting production order.
For separately delivered tooling, mold specifications, required documentation, acceptance conditions and delivery arrangements are agreed for the project.
A defined approval process connects tooling decisions with finished-part requirements.
Drawing & Requirement Review
Review the CAD model, alloy, component function, critical dimensions, surface treatment, projected quantities and acceptance criteria.
Fabricación & Tooling Proposal
Evaluate casting suitability, required machining, tooling scope, inspection and commercial requirements.
Die Design & Manufacture
Develop and manufacture the tooling according to the agreed design and production requirements.
Initial Samples & Evaluation
Produce trial castings and complete the agreed machining, finishing and inspection activities needed for sample approval.
Approval & Production Release
Review sample results, resolve outstanding requirements and release production according to the agreed approval process.
Production & Final Inspection
Carry out casting and specified secondary operations, followed by inspection, documentation and shipment.
Drawing revisions, sample approval, tooling responsibilities and engineering changes are controlled according to the agreed project arrangements.
Die casting may be more economical when the geometry, design stability and expected production volume justify dedicated tooling.
The comparison should include mold investment, casting, secondary machining, finishing, inspection and any assembly operations.
The most suitable process depends on the total cost of producing an accepted component.
Yes. Critical bores, threads, sealing faces, mounting interfaces and locating features can be machined after casting where required.
Machining allowances, reference datums, tolerances and inspection requirements should be considered during tooling and production planning.
Pressure-tight performance depends on component design, casting quality, process controls and verification.
Include the operating conditions, test medium, pressure, duration and allowable leakage in your enquiry.
Where appropriate and permitted by the specification, porosity-sealing impregnation may be evaluated as part of the agreed manufacturing route.
Yes. GPT Precision manufactures die casting molds for production programs and can also supply completed molds independently.
Tool specifications, acceptance requirements, documentation and delivery arrangements are confirmed for each project.
Customer-funded molds belong to the customer once the agreed mold fee has been paid in full.
We maintain molds retained with us for production. Customer-requested design changes requiring mold modifications are charged to the customer.
Tool life, maintenance scope, storage, repair and transfer arrangements are established in the applicable quotation and tooling agreement.
Yes. Send the available drawing, material specification, sample information and expected production quantities.
If existing tooling is involved, include the mold's condition, ownership and transfer details.
Casting suitability, potential tooling changes, machining requirements and acceptance criteria can then be reviewed for the proposed supply program.
Start with the finished component you need.
Whether you are developing a new die-cast component, reviewing an existing design or preparing a repeat production program, GPT Precision can assess the tooling, casting, CNC machining, finishing and inspection requirements as a coordinated project.
Email drawings to sales@precisiontoolingchina.com
