A mid-size aluminum die typically costs $5,000–$75,000, while published supplier ranges extend from $15,000 to $150,000 for larger or more complex tools [S2][S5].
The price per cavity cannot be stated credibly without the part envelope, cavity count, slides, machining, steel package, annual volume, and production cycle.
Die price per cavity starts with the part geometry
Tooling cost rises with part size, steel grade, cavity count, sliding cores, and expected tool life, making a simple single-cavity bracket fundamentally different from a multi-cavity housing with hydraulic slides [S1].
A published cost example gives a useful benchmark: a $22,000 die for a part requiring 10 drilled holes and milling of the top and bottom surfaces, compared with $1,500 of sand-casting pattern tooling [S2]. The same example reports die-cast insert life above 100,000 parts and potentially 1,000,000 parts when tolerances remain comparable to the sand-casting process [S2].
That example should not be translated directly into a universal cavity price. It demonstrates why cavity division requires the complete manufacturing package, including die footprint, parting line, side actions, inserts, ejector system, cooling passages, machining allowances, and acceptance tolerances.
A single-cavity die may fit a mid-size component and reduce entry cost, but it constrains output to one part per machine cycle. A two-cavity die raises output per cycle but adds steel, machining, alignment, feeding, and thermal-control requirements [S1][S4].
Compare one, two, and four cavity structures
A four-cavity tool with hydraulic slides can produce more parts per cycle than a simple single-cavity tool, but the relevant economic measure is total tooling cost divided by planned production volume, not cavity count alone [S1].
Mid-size does not establish a price class by itself. Part weight, projected area, cavity spacing, and machine clamping capacity can make a compact multi-cavity die cost more than a larger single-cavity die. Machine selection must therefore follow the geometry and projected area rather than the number of cavities alone [S1].
The cost drivers inside a cavity
Published die-casting quotes divide project economics into material, tooling, conversion, and finishing or logistics, with tooling treated as a one-time investment whose structure can be negotiated [S1].
Inside the tooling line, steel grade and expected tool life affect both the purchase price and maintenance exposure. Special steels are required for repeated exposure to molten metal at high temperature and pressure, and supplier guidance places tool performance in the tens of thousands of cycles for the relevant die class [S5].
Moving features add cost because they require additional steel, machining, actuation, or inserts. Sliding cores are explicitly identified as a tooling-price driver [S1]. Machined features can also reduce downstream operations, as illustrated by a housing design whose integrated cooling and precision features eliminated three separate machining steps [S4].
Insert selection is therefore not a line-item decision. A low-cost insert may add more than its purchase price if it wears early, changes dimensions, or forces a die repair. The practical specification is expected output against insert life and tolerance stability, not simply the lowest insert price.
Volume determines the economic cavity count
Multi-cavity tooling lowers unit cost when volume supports the amortization, while adding unnecessary cost when demand cannot fill the added capacity [S4]. For comparison, a published sand-casting example calculates the switch to die casting at 1,298 parts, with total part cost falling from $32.00 to $16.20 per part after machining savings [S2].
The same example shows the volume effect: at 1,000 parts, sand casting totals $33,500 versus $38,200 for die casting, while at 5,000 parts, die casting totals $103,000 versus $161,500 for sand casting [S2].
For a die-cost calculation, request both a lump-sum tooling price and an amortized piece-price schedule. One arrangement gives the buyer tool ownership and transfer flexibility, while another reduces the initial commitment but embeds the tool charge in production prices [S1]. A tooling-fee credit structure can also tie part of the effective tool cost to agreed volume thresholds [S1].
A mid-size component should be tested at realistic volumes rather than assigned a cavity count from a generic price table. If planned output is below the supplier's break-even for a multi-cavity tool, a single-cavity die may deliver the lower total cost despite its higher conversion cost per part.
Installation and maintenance change the real price
The purchase price excludes the operating consequences of the cavity layout, including furnace energy, machine utilization, cycle time, lubrication, die maintenance, and planned insert replacement [S1][S7].
Published cost decomposition places material at 38% of total expense, labor and overhead at 39%, energy at 7%, and tooling amortization at 18% in one cost model [S3]. These percentages describe that model rather than a universal allocation, but they show why cycle time and machine rate remain important after the die is paid for.
For each proposed cavity layout, the foundry should report cycle time, projected output per hour, machine size, shot weight, cooling requirements, lubrication consumption, and maintenance intervals. Because an aluminum die-casting part price includes material, tooling amortization, conversion costs such as cycle time, and finishing, the effective price per cavity cannot be calculated from the tool invoice alone.
Total-cost comparisons should also include machining. A $22,000 die in the published example eliminated $3.00 of machining per part, while the die-cast part price was $8.20 and remaining machining was $8.00 [S2]. The die paid back through those savings after 1,298 parts in that specific case, not as a general threshold.
Obtain comparable supplier quotations
A defensible per-cavity price requires quotations based on the same drawing, alloy, annual volume, tolerance class, surface requirement, and machining allowance, with tooling shown as a separate line item [S1][S5].
For a mid-size aluminum part, the procurement sequence should be: confirm the part envelope and projected area, define slides and inserts, request 1-, 2-, and 4-cavity feasibility options, compare tool price against volume, then calculate delivered piece price including material, cycle time, finishing, and machining.
No fixed numerical price per cavity can be supported from the available information. The defensible answer is a quote-based range with a stated production basis, not a simple division of $5,000–$75,000 by 1, 2, or 4 cavities [S1][S2].
A useful first RFQ package includes a dimensioned 3D model, 2D drawing, alloy, net weight, projected annual volume, minimum order quantity, tolerance and surface specifications, required machining, and delivery schedule. Ask the supplier to state the cavity count, machine tonnage, cycle time, estimated output, tool life assumptions, and ownership terms alongside the tooling price.
The next trackable signal is the supplier's amortized tooling schedule: if the per-part charge falls materially at the committed volume without a change in alloy or finishing, the cavity and utilization assumptions are doing the work [S1][S4].