Aluminum Gravity Casting Cost RFQ Guide: A356 and ZL114

# Aluminum Gravity Casting Cost RFQ Guide: Pricing Inputs for A356 and ZL114

Aluminum gravity casting cost is not a single price table. A useful supplier quote depends on part geometry, alloy and temper, tooling status, annual volume, machining scope, inspection records, packaging, Incoterm, and the buyer's approval path.

This guide is a conservative RFQ framework for buyers comparing A356, ZL114, and similar aluminum gravity casting programs. Use it to prepare the information a supplier needs before quoting. Do not treat the examples below as a fixed price, fixed lead time, or promised savings.

Updated note for buyers: use this article to make quote assumptions comparable. A supplier can only review gravity casting cost responsibly when the RFQ separates tooling, raw casting, heat treatment, CNC machining, inspection records, packaging, Incoterm, and approval evidence.

If your drawing package is ready, submit the details through the request quote form. If you are still preparing scope, compare this guide with the quote readiness checklist and casting drawing requirements.

What changes a gravity casting quote

A supplier needs more than a target piece price. The highest-impact inputs are:

• •drawing revision, STEP model, and critical dimensions
• •alloy target such as A356, ZL114, ADC12, or accepted equivalent
• •temper and heat-treatment requirement, if any
• •annual volume, sample quantity, pilot quantity, and release timing
• •tooling status: new tool, prototype tool, production tool, duplicate tool, or transfer tool
• •machining scope: raw casting only, casting plus CNC, or quote both options
• •inspection scope: material certificate, CMM, leak test, X-ray, FAI, PPAP-style, or traceability records
• •surface finish, coating, marking, cleaning, and packaging requirements
• •Incoterm, destination, freight preference, and customs-document needs

The same casting can receive different quotes when one supplier includes machining, leak testing, packaging, and export documents while another quotes only raw casting weight. The buyer should compare the full scope, not only the visible unit price.

Cost buckets buyers should separate

1. Tooling and fixture scope

Permanent mold tooling for gravity casting is a separate investment from the piece price. The quote should state whether the tooling is for prototype evaluation, production release, duplicate supply, or transfer-tool review.

Ask the supplier to clarify:

• •who owns the tool after payment
• •whether fixture, core box, trim tool, gauge, or CNC fixture cost is included
• •whether drawing changes after sampling may require tool modification
• •what sample approval evidence will be supplied before production release

For a second-source project, the tooling discussion should also cover whether the buyer is transferring an existing tool, duplicating a tool, or asking the new supplier to quote a new tool from drawings.

2. Raw casting cost

Raw casting cost depends on metal weight, yield loss through runners and risers, melt practice, part complexity, core use, cycle time, and batch setup. A light part with difficult cores may cost more than a heavier but simpler part.

Useful RFQ fields:

• •estimated casting weight and finished weight if known
• •thick sections, thin walls, and porosity-sensitive areas
• •cores, inserts, side features, and parting-line constraints
• •pressure, leak, or sealing risks that affect gating and inspection

When the drawing is early, ask the supplier to separate confirmed assumptions from items that need DFM review.

3. Heat treatment and material evidence

A356-T6 and related gravity casting programs may require heat treatment and mechanical evidence. ZL114 or equivalent material routes should be discussed against the buyer's drawing, standard, and approval requirements.

Ask for:

• •material certificate format
• •heat-treatment standard or project-specific requirement
• •whether test bars, tensile data, hardness checks, or traceability are required
• •whether the buyer accepts equivalent alloys or only a named specification

Do not assume a certificate alone proves project approval. The quote should connect material evidence to the part drawing and inspection plan.

4. CNC machining and datum control

Many gravity castings become quote-sensitive after machining is added. Bearing seats, sealing faces, ports, threads, O-ring grooves, flange faces, and datum surfaces can change fixture design, inspection time, and approval risk.

Ask the supplier to quote machining separately or clearly state what is included:

• •datum strategy and cleanup allowance
• •critical bores, threads, sealing lands, and surface finish
• •CMM or gauge report format
• •burr control, cleaning, and packaging after machining

For valve bodies, pump housings, gearbox housings, and intake manifolds, the machining plan should be reviewed before a buyer compares suppliers.

5. Inspection and documentation

Inspection cost is not only the test itself. It includes fixture setup, sampling plan, report format, traceability, corrective-action discipline, and document review time.

Common inspection scopes include:

• •visual and dimensional inspection
• •CMM or fixture report
• •material certificate
• •leak or pressure test when specified
• •X-ray or section review when internal soundness matters
• •FAI or PPAP-style records when the buyer requires formal approval

Buyers should define the inspection evidence they need before asking for final price comparison.

6. Logistics and landed-cost assumptions

Landed cost can change with packing density, shipment mode, destination, Incoterm, tariff treatment, and customs documentation. The quote should not hide freight or duty assumptions inside a vague total.

Clarify:

• •shipment destination and Incoterm
• •pallet, carton, rust prevention, and export packing requirements
• •preferred ocean, air, courier, or buyer-arranged freight path
• •whether duties, tariffs, VAT, brokerage, and local delivery are included or excluded

For international sourcing, buyers should compare landed cost and approval workload, not only ex-works piece price.

A practical RFQ cost template

Use this structure when asking Bohua or another supplier for gravity casting pricing:

> Part name and drawing revision: __

> Drawing package: PDF __ STEP/IGES __

> Alloy or accepted equivalent: __

> Temper / heat treatment: __

> Annual volume: __ Sample quantity: __ Pilot quantity: __

> Tooling status: new / transfer / duplicate / unknown

> Casting process preference: gravity casting / low-pressure / supplier recommendation

> Machining scope: raw casting only / casting plus CNC / quote both

> Critical features: sealing face __ bore __ thread __ flatness __ datum __

> Inspection records: material cert __ CMM __ leak test __ X-ray __ FAI/PPAP-style __

> Surface finish and coating: __

> Packaging and destination: __

> Incoterm or freight assumption: __

> Sourcing goal: new project / second source / transfer tool / cost comparison / capacity backup

The more complete the template, the easier it is to compare suppliers fairly.

Questions to ask when quotes differ

If two quotes are far apart, ask:

• •Is tooling quoted separately or hidden in piece price?
• •Does the piece price include CNC machining, heat treatment, coating, packing, and inspection records?
• •Are sample, pilot, and production quantities priced separately?
• •Which alloy and temper are assumed?
• •Is the supplier quoting raw casting weight or finished part scope?
• •What inspection records are included, and which are optional?
• •Does the quote include freight, duty, or only ex-works supply?
• •Which assumptions will require re-quotation if the drawing changes?

A careful supplier should be able to explain the scope. If the answer is vague, the price may not be comparable.

Cost reduction without unsupported shortcuts

Cost reduction should come from engineering and sourcing clarity, not from removing inspection or accepting hidden risk.

Responsible levers include:

• •simplify parting line or core design where the drawing allows it
• •confirm realistic wall thickness and machining allowance
• •separate prototype, pilot, and production tooling decisions
• •batch orders around real annual demand instead of arbitrary MOQ pressure
• •quote raw casting and casting-plus-CNC as separate options
• •define which inspection records are required for approval and which are optional
• •compare landed cost with freight, tariff, and inventory assumptions visible

Avoid asking suppliers to remove critical inspection, hide material changes, or quote a drawing they have not reviewed.

FAQ

Can Bohua give a fixed gravity casting price without drawings?

Only a rough planning range is possible without drawings. A usable quote needs geometry, alloy, annual volume, machining scope, inspection records, and commercial terms.

Should buyers compare only the casting piece price?

No. Compare tooling, samples, machining, heat treatment, inspection, finishing, packing, freight, duties, and supplier approval workload. A low raw-casting price can become expensive if the finished-part scope is excluded.

What makes A356 or ZL114 pricing change?

Pricing changes with material availability, heat treatment, mechanical requirements, casting weight, yield loss, machining allowance, inspection scope, and whether the buyer requires a named standard or accepts an equivalent after review.

How should a buyer submit a pricing RFQ?

Use the request quote form with the drawing, STEP model, alloy, annual volume, sample quantity, tooling status, machining scope, inspection needs, destination, and Incoterm.

What if the buyer is only benchmarking suppliers?

State that the project is a supplier-comparison or budgetary review. Send the same assumptions to each supplier, then compare quote clarity, risk questions, included scope, and response quality.

Next step

For a quote-ready project, use the request quote form. For preparation, use the quote readiness checklist, casting drawing requirements, and supplier capability sheet.