Aluminum Casting RFQ Checklist: What to Include for Faster, More Accurate Quotes

# Aluminum Casting RFQ Checklist: What to Include for Faster, More Accurate Quotes

A large number of sourcing delays begin before production. They start in the RFQ.

When buyers send incomplete RFQs to aluminum casting suppliers, the result is predictable: slow quotations, repeated clarification, mismatched assumptions, and sample delays. The supplier may still answer quickly, but the quote is often built on guesswork. That usually creates problems later in tooling, sampling, or production pricing.

If you want a faster, more accurate response from a China casting supplier, the best thing you can do is send a complete RFQ package from the beginning.

This guide gives procurement managers, project buyers, and engineers a practical aluminum casting RFQ checklist. It explains what information suppliers actually need, why it matters, and how to avoid the most common mistakes when sourcing gravity casting, die casting, or machined aluminum parts from China.

Why RFQ Quality Matters

A good RFQ improves three things immediately:

• •Quote accuracy — the supplier can price the correct process, tooling, and secondary operations
• •Response speed — fewer emails are needed to fill information gaps
• •Supplier comparison — you can compare quotes on the same assumptions

A weak RFQ does the opposite. Different suppliers quote different assumptions, so the cheapest quote is often not really cheaper.

Core RFQ Checklist

Below is the minimum information a buyer should provide.

1. 2D drawing and 3D model

This is the foundation.

Provide:

• •PDF drawing with revision level
• •3D file in STEP, IGES, or other neutral format
• •Clear unit system
• •Notes that match the latest revision

Why it matters:

• •The drawing defines tolerances and inspection intent
• •The 3D model helps the supplier assess tooling and casting feasibility

If the supplier receives only a rough picture or an outdated print, the quote will be less reliable.

2. Material and process requirement

Do not simply write “aluminum casting.”

Specify:

• •Alloy grade, for example A356, ZL114, ADC12
• •Heat treatment requirement, such as T6
• •Preferred process if already known: gravity casting, die casting, low-pressure casting, sand casting
• •If process is open, say so explicitly

Why it matters:

• •Alloy and process choice affect tooling, yield, machining, and final performance
• •A356-T6 and ADC12 can lead to very different cost structures and capabilities

3. Annual volume and batch size

Give realistic volume information.

Include:

• •Estimated annual demand
• •Prototype quantity
• •Sample quantity
• •Typical order batch size
• •Forecast horizon if available

Why it matters:

• •Tooling amortization depends on expected volume
• •Process recommendation may change depending on quantity
• •MOQ and lead time assumptions become more realistic

4. Part function and application

Many buyers skip this, but it helps a lot.

State:

• •Final application, such as pump housing, gearbox housing, intake manifold, valve body
• •End industry: automotive, industrial, valve, pump, EV, lighting
• •Whether the part is cosmetic, structural, pressure-tight, or heat-related

Why it matters:

• •The supplier can identify hidden technical risks
• •Inspection and process route may change based on application criticality

5. Critical dimensions and tolerances

Not every dimension has the same importance.

Highlight:

• •Critical-to-function dimensions
• •Machined interfaces
• •Flatness, concentricity, positional tolerance if relevant
• •Appearance-critical surfaces

Why it matters:

• •The supplier can focus process design where it matters most
• •Tight requirements on a few dimensions are easier to manage than unrealistic tightness everywhere

6. Machining scope

State clearly whether you need:

• •Raw casting only
• •Semi-machined part
• •Fully machined part
• •Surface treatment after machining
• •Assembly or packaging service

Why it matters:

• •Many quotation gaps happen because one supplier quotes cast-only while another includes machining
• •This makes quote comparison meaningless unless the scope is aligned

7. Quality and inspection requirements

For export projects, this section is critical.

Include if applicable:

• •Material cert requirement
• •CMM report requirement
• •X-ray requirement
• •Pressure or leak test requirement
• •First article inspection report
• •PPAP level or automotive submission requirement
• •Surface defect criteria

Why it matters:

• •Inspection cost can materially change price
• •Quality planning starts at RFQ, not after SOP

8. Surface finish and post-treatment

Specify whether the part needs:

• •Shot blasting
• •Deburring standard
• •Painting or powder coating
• •Anodizing
• •Impregnation
• •Corrosion protection

Why it matters:

• •Surface treatment changes both cost and process route
• •Some finishes require better casting surface stability than others

9. Packaging and logistics requirement

Include:

• •Export packing expectation
• •Labeling requirement
• •Pallet or carton constraints
• •Destination country
• •Incoterm preference

Why it matters:

• •Packaging affects cost and quote assumptions
• •Some buyers need returnable packaging or barcode traceability from the start

10. Timing requirement

State:

• •RFQ deadline
• •Target tooling kickoff date
• •Sample requirement date
• •SOP target date

Why it matters:

• •The supplier can tell you whether timing is realistic
• •Better suppliers will flag schedule risks early

RFQ Attachments Buyers Often Forget

Even experienced buyers sometimes forget these useful attachments:

• •Existing sample photos
• •Current supplier issue photos
• •Leak test standard
• •Assembly mating part reference
• •Historical defect summary
• •Expected annual purchase plan
• •Customer-specific quality format

These extras often help a serious supplier quote more intelligently.

Common RFQ Mistakes

Mistake 1: Asking for a quote without volume

Without annual volume, tooling and process assumptions are weak.

Mistake 2: No clear alloy or heat treatment

A356-T6 and ADC12 should never be treated as interchangeable assumptions.

Mistake 3: Sending only a 3D file

A 3D model helps, but tolerances and inspection logic usually live in the drawing.

Mistake 4: Treating all dimensions as critical

This often raises cost and creates confusion. Mark what truly matters.

Mistake 5: Hiding the application

Suppliers quote better when they know whether the part is structural, cosmetic, pressure-related, or thermal.

What Good Suppliers Usually Do with a Strong RFQ

If your RFQ is complete, a capable supplier should be able to provide:

• •Process recommendation
• •Tooling estimate
• •Piece price based on annual volume
• •Sampling lead time
• •Questions on risk areas
• •Possible DFM improvement suggestions

That is the kind of response procurement should want. It shows the supplier is thinking beyond raw price.

RFQ Checklist for First-Time China Buyers

If this is your first time sourcing from China, here is the simplest practical version:

• •Latest drawing + 3D file
• •Alloy and heat treatment
• •Annual volume and sample quantity
• •Process requirement or open-process note
• •Key tolerances
• •Machining scope
• •Inspection requirement
• •Surface finish
• •Delivery term and destination
• •Target timing

If you can provide these 10 items, your quotation quality will improve significantly.

Why This Matters for Quote Speed

Suppliers in China often respond quickly, but speed alone is not quality. The fastest useful quotes usually happen when:

• •Technical scope is complete
• •Volume is realistic
• •Quality expectations are clear
• •The buyer identifies critical features early

This allows suppliers to respond with confidence instead of assumptions.

Final Takeaway

An effective aluminum casting RFQ checklist is one of the simplest ways to reduce sourcing risk. It improves quote speed, accuracy, supplier comparison, and engineering alignment before money is spent on tooling.

For first-time buyers sourcing from China, the most important rule is simple: do not ask for a quote with incomplete technical and commercial information. A better RFQ almost always leads to a better supplier response.

CTA suggestions:

• •Upload your drawing for DFM review
• •Request a capability sheet