Aluminum Die Casting
aluminum die casting
Die Casting Services
Die Casting Services for Custom Metal Parts
Die casting injects molten or semi-molten alloy into a reusable steel die under pressure to produce near-net-shape parts. SR collects quotes from vetted die casters, reviews designs and manages inspection and delivery.
- Aluminum, zinc, magnesium
- High-pressure and vacuum
- DFM review included
- QC and inspection managed
Quick answer
Die casting is a metal casting process that injects molten or semi-molten alloy into a reusable steel die under pressure, producing near-net-shape parts. Die casting services cover design review, die manufacture, casting, trimming, machining, finishing, inspection and logistics, typically for aluminum, zinc, magnesium and selected copper alloys.
Die Casting Capabilities: Processes, Part Sizes and Volumes
Die casting (also written diecast or die cast) covers several pressure-casting routes in which metal is forced into a hardened steel die, the die opens, and the part is ejected. The route depends on alloy, wall thickness, porosity limits and annual volume.
High-pressure die casting (HPDC) routes
- Cold-chamber die casting (HPDC): molten metal is ladled into a shot sleeve and injected. It suits aluminum, magnesium and some copper alloys, with high productivity and dimensional repeatability.
- Hot-chamber die casting (HPDC): the injection system sits in the melt. It gives fast cycles and efficient metal delivery for compatible zinc and selected magnesium alloys.
- Vacuum die casting: vacuum-capable dies and process controls reduce entrained gas, which can improve structural integrity, heat treatment and welding potential.
- Squeeze casting: pressure during solidification reduces porosity. It is usually slower and less suited to intricate thin-wall geometry.
- Semi-solid die casting: controlled feedstock and specialized equipment reduce turbulence and porosity, with tighter process management.
Part size and volume range
Die casting is usually most economical at moderate-to-high volume because tooling costs are spread across many parts. Small precision components are common in zinc, while larger structural and housing parts are common in aluminum and magnesium. Minimum wall thickness is typically about 0.04–0.08 in (1–2 mm), application dependent, and must be confirmed for the alloy and die design.
Send the 3D model, alloy, annual volume and any porosity or leak requirements with your RFQ. Those four items drive most process and tooling decisions.
Die Casting Materials and Finishes
Aluminum, zinc, magnesium and selected copper alloys cover most die casting work, and die cast aluminum is typical for automotive housings and structural parts. Alloy choice sets casting behavior, minimum wall, achievable tolerance and the finishing options that make sense.
| Material | Grade | Properties | Typical uses |
|---|---|---|---|
| Aluminum | Common die-casting aluminum alloys; specify the applicable NADCA or regional alloy designation | Low density, good thermal conductivity, corrosion resistance and castability | Automotive housings, structural parts, heat sinks and equipment enclosures |
| Zinc | Zamak and ZA alloy families | Good fluidity, surface finish, dimensional stability and wear resistance | Small precision hardware, consumer products, locks, fittings and housings |
| Magnesium | Commercial magnesium die-casting alloy families | Very low density, good stiffness-to-weight ratio and electromagnetic shielding potential | Lightweight automotive, electronics and portable-equipment parts |
| Copper alloys | Commercial brass and bronze die-casting families | High thermal and electrical conductivity; higher density and tooling demands than aluminum | Electrical, plumbing, thermal and industrial components |
Common finishes
- As-cast with flash and gates trimmed, where the cast surface is acceptable.
- Shot blasting or vibratory finishing to remove parting-line marks.
- Machining of sealing faces, bores, threads and mounting features to tighter tolerances than the casting can hold.
- Anodizing or conversion coating for aluminum, and plating or passivation for zinc, where corrosion or appearance matters.
- Powder coating or painting for visible housings.
- Impregnation where a pressure-tight part is required and micro-porosity must be closed.
Confirm the finish specification against the alloy before tooling is cut, because some finishes change dimensional allowances and masking requirements.
Die Casting Tolerances, Sizes and Lead Times
Typical die casting tolerance is plus or minus 0.002–0.005 in (0.05–0.13 mm), confirmed against NADCA alloy, size and feature tables. Miniature castings can hold tighter values. All figures are typical and must be confirmed for the specific alloy, geometry and die design.
| Parameter | Typical range | Standard or source |
|---|---|---|
| Typical production cycle | 15–90 seconds | DFMA process comparison; application and geometry dependent |
| Typical tolerance | ±0.002–0.005 in (±0.05–0.13 mm) | DFMA comparison; confirm against NADCA alloy, size and feature tables |
| Miniature casting tolerance | Typically ±0.0008 in (±0.020 mm) up to 1 in (25.4 mm); ±0.001 in (±0.025 mm) per additional inch | NADCA miniature die-casting engineering reference |
| Minimum wall thickness | Approximately 0.04–0.08 in (1–2 mm), application dependent | DFMA comparison; verify with the selected alloy, die design and NADCA guidance |
| Die steel | H-10, H-11, H-13; premium or superior H-13 for demanding aluminum, magnesium and ZA tooling | NADCA tooling guidance and NADCA No. 229 recommendations |
Lead time structure
- Quotation: SR returns vetted supplier quotes in 5-7 working days from a complete RFQ.
- DFM and tooling: design review, die design, die manufacture and a sampling run precede production release.
- Production: cycle time is typically 15–90 seconds per shot, but total lead time depends on machine availability, alloy supply and finishing.
- Finishing and inspection: machining, coating and inspection add time and are scheduled with the casting run.
Tighter tolerances are usually achieved by machining specific features after casting, not by tightening the whole drawing.
Die Casting Industries and Applications
Die casting is used wherever repeatable metal parts are needed in volume with limited machining. Automotive is the largest user, followed by industrial equipment, electronics and consumer hardware.
| Industry | Example parts | Why die casting fits |
|---|---|---|
| Automotive | Transmission and clutch housings, brackets, structural nodes, heat sinks, sensor bodies | High productivity and dimensional repeatability at volume; aluminum and magnesium reduce weight |
| Industrial equipment | Pump and motor housings, gear covers, valve bodies, mounting plates | Complex near-net shapes with fewer machining operations |
| Electronics and telecom | Enclosures, heat sinks, frames, shielding housings | Aluminum thermal conductivity and magnesium electromagnetic shielding potential |
| Consumer and hardware | Locks, fittings, small precision hardware, appliance components | Zinc fluidity supports small, detailed parts with good surface finish |
| Electrical and thermal | Connectors, busbar components, thermal management parts | Copper alloys offer high thermal and electrical conductivity |
For automotive programs, expect the casting supplier to work to IATF 16949 quality management requirements and to support PPAP documentation where the program calls for it.
How Ordering Die Casting Services Works
Ordering die casting services through SR follows six steps, from RFQ to delivered parts. SR is a manufacturing broker and does not own factories or machines. We collect quotes from a vetted supplier network, manage quality and inspection, and deliver parts to you.
- 1. Submit the RFQ Send 3D models, 2D drawings with tolerances and GD&T, alloy, annual volume, finishing and inspection requirements. Incomplete drawings are the most common cause of quote delay.
- 2. DFM review We review wall thickness, draft, radii, parting line, gate and ejector placement, porosity risk and features needing post-casting machining, then feed back changes before quoting.
- 3. Vetted supplier quotes SR routes the package to die casters matched to your alloy, size and volume, and returns consolidated quotes in 5-7 working days.
- 4. Order and tooling On approval, the die is designed and built, then a sampling run produces first articles for your review.
- 5. Production and QC Casting, trimming, machining and finishing run to the approved plan, with inspection at the stages defined in the control plan.
- 6. Inspection and shipping Final inspection, documentation and packing are completed, then parts ship to your address or next operation.
Questions on scope or documentation? Email killol@sourcingrepository.com or use the quote form. SR is based at 201 SG Mall, Ahmedabad.
Die Casting Quality and Inspection
Quality control in die casting focuses on dimensional accuracy, porosity and surface condition, because those three drive fit, function and leak performance.
- First article inspection: full dimensional report on the sampling run before production release.
- Dimensional inspection: calipers, micrometers, height gauges and CMM checks against the drawing and GD&T.
- Visual and surface inspection: flash, cold shuts, flow marks, blisters and ejector marks against an approved limit sample.
- Porosity assessment: sectioning, X-ray or pressure testing where the part must be structural or pressure-tight.
- Material verification: alloy chemistry confirmation against the specified grade.
- Traceability: heat or lot identification linking castings to material certificates and inspection records.
- Documentation: inspection reports, material certificates and first article reports issued with the shipment.
Inspection sampling plans, porosity acceptance classes and surface finish limits are project-specific and are agreed before production. For automotive work, PPAP documentation is prepared where the program requires it.
What Drives Die Casting Cost
Die casting cost is dominated by tooling and volume, then by alloy, cycle time and the amount of post-casting work. No universal price applies; every quote depends on the part.
Main cost drivers
- Die design and manufacture, including die steel grade and number of cavities
- Annual volume, which sets how far tooling cost is spread
- Alloy and part weight, including runner and overflow metal
- Wall thickness and cycle time, typically 15-90 seconds per shot
- Tolerances tighter than the casting process can hold, requiring machining
- Porosity, leak and structural requirements that add process controls or vacuum
- Finishing, coating, impregnation and inspection scope
How to reduce cost
- Keep walls uniform and within the typical 0.04-0.08 in (1-2 mm) range where the design allows
- Add draft and generous radii so the part releases cleanly
- Specify casting tolerances on cast features and reserve tight tolerances for machined features only
- Consolidate parts into one casting instead of assembling several
- Standardize on one alloy family across a product family
- Commit to a realistic annual volume so the die can be amortized
- Agree inspection scope early instead of adding it after sampling
The cheapest die is rarely the cheapest program. Die steel grade and die design affect die life, downtime and scrap, so compare total cost across the expected production run.
Have a drawing to quote?
Upload it with quantity and material to start a quote.
FAQ
Common questions
What is die casting?
Die casting is a metal casting process that injects molten or semi-molten alloy into a reusable steel die under pressure, producing near-net-shape parts. High-pressure die casting is commonly used for repeatable, high-volume aluminum, zinc, magnesium and selected copper-alloy components.
What are die casting services?
Die casting services may include design review, die manufacture, casting, trimming, machining, finishing, inspection, assembly and logistics. SR collects quotes from vetted die casters, manages DFM feedback, quality and inspection, and delivers finished parts. Confirm the exact scope for each project before ordering.
What metals can be die cast?
Common families include aluminum, zinc, magnesium, copper alloys and zinc-aluminum alloys. Aluminum suits housings, structural parts and heat sinks; zinc suits small precision hardware; magnesium suits lightweight parts; copper alloys suit electrical and thermal components. Alloy choice sets wall thickness, tolerance and finishing options.
Is die casting economical?
Die casting is usually most economical at moderate-to-high volume, because tooling and process-development costs are spread across many parts. At low volume, tooling dominates the piece cost and another process may be cheaper. Cycle time is typically 15-90 seconds, which supports high production rates once the die is running.
Related resources
Keep reading
Ready when you are
Get die casting quotes from vetted suppliers
Send your 3D models, drawings, alloy and annual volume. SR reviews the design, collects supplier quotes and manages inspection and delivery. Quotes typically return in 5-7 working days.
Your files stay confidential. NDA available on request.