Aluminum Extrusion RFQ Checklist: From Drawing to Comparable Quotes

Oct 12, 2026 · Export & Procurement · 13 min read

Answered immediately: a complete aluminum-extrusion RFQ must give the seller unambiguous drawings, a clear alloy/temper callout, exact quantities and length distribution, required surface finish and post‑extrusion work, inspection and sa…

Summary checklist: what an RFQ must cover

Below is the minimum information an engineering, procurement or quality team should include in a direct extrusion RFQ to get comparable quotes. Sellers will ask follow-up questions; including these fields up front reduces ambiguity and allows apples‑to‑apples pricing.

Drawings and geometry control

The drawing is the single most important RFQ item. Do not expect a quote to be comparable if one supplier sizes a critical wall at ±0.1 mm and another assumes ±0.5 mm unless stated. Supply both a full assembly drawing (if the extrusion is part of a larger assembly) and a detailed profile drawing that includes:

• Datum references and inspection datums—show how the profile will be fixtured and measured.
• Critical dimensions with tolerances and whether they are functional or reference only.
• Surface texture or cosmetic zones (e.g., protected faces, machined faces).
• Wall thickness minimums and webs—identify areas subject to die swell and require undersizing allowance.

Provide native CAD files (STEP or parasolid preferred) plus a clean PDF. When suppliers quote, they will propose tolerances consistent with their tooling and process; if you require ISO profile tolerances, reference ISO 6362‑4:2022 in the specification and note any deviations. For a practical checklist targeted at OEMs preparing drawings, see the drawing checklist article: aluminum extrusion drawing checklist for OEMs.

Alloy, temper and mechanical requirements

The alloy and temper control extrusion force, straightening needs, machinability and response to heat treatment. Common alloys include 6063 and 6061 for structural profiles, but project requirements (weldability, thermal conductivity, anodizing appearance, corrosion resistance) should drive the selection. State mechanical property requirements only if you will accept supplier certification (mill test report) or require full mechanical testing.

If you request mechanical property acceptance (proof stress, tensile), indicate whether supplier mill test reports are acceptable. Use ASTM B221‑21 as the general reference for extruded profiles and state whether you want full batch traceability. When interchangeability of dimensions between suppliers could be an issue, explicitly require measurement locations and feature datums to avoid mismatched mating parts.

Lengths, quantities and order consolidation

Quantity and length distribution directly influence die cost amortization, line changeovers and scrap percentage. Provide three pieces of information: predicted lifetime demand (annualized), initial order quantity, and requested delivery schedule. Suppliers price dies differently depending on expected lifetime volume—be explicit if the RFQ is for a one‑time prototype run versus ongoing production.

Consider consolidation strategies to reduce the number of dies and shipments; read supplier consolidation examples at aluminum profile order consolidation. Be explicit about allowable cut lengths and whether you will accept multiple length cuts per extrusion bar; indicate if straight cut saw tolerances are required and whether heat‑distortion concerns will require additional straightening operations.

Finishes, coatings and surface acceptance

Surface finish choices change process flow, cost and inspection. Make a clear distinction between decorative anodic finishes, hard anodize, and powder coatings. Reference the applicable finish standard where relevant and state surface condition before coating (mechanical finish, chemical brightening, deoxidizing).

Note: ISO 7599:2018 covers decorative anodizing processes and appearance criteria; if you require a hard anodize service or special wear properties, specify the process and acceptance tests as project‑dependent items.

Machining, secondary operations and inspection

Secondary operations typically contribute more cost and lead time than the extrusion itself. Provide complete machining drawings with true position tolerances where applicable and clearly identify datum features. For holes and tapped features, list hole size, tolerance, and whether they are formed during extrusion or post‑machined. For critical fits, specify thread class and whether a gauge will be provided.

For inspection, propose an inspection plan in the RFQ: first article inspection (FAI) with CMM report, dimensional sampling frequency, and the method of accepting cosmetic defects. If you expect a supplier to supply a certificate of conformity or material test report, say so. If you will provide a dedicated inspection checklist, attach it. Where supplier measurement capability differs, agree on measurement method and location; otherwise, quoted tolerances are not directly comparable.

Packing, marking, Incoterms and destination

Packing and Incoterms affect landed cost and risk transfer. State preferred Incoterm (referencing the current ICC Incoterms edition) and the exact destination (port or warehouse). Indicate packing strategy and any special marking, handling, or export documentation required.

For commercial clarity and to avoid quotes that are not comparable, use agreed Incoterms and include the destination address. If you need help understanding the cost impact of FOB vs CIF, see the primer: FOB vs CIF Incoterms.

Worked Specification or Review Example

The short worked example below shows how to turn a drawing and requirements into a concise RFQ package. All numeric values are illustrative assumptions only and not product guarantees; they are used to show how to phrase requirements and what suppliers will need to price.

For this example, specify whether the die remains the buyer’s property or the supplier retains it, and include desired tooling ownership, re‑order discount and expiration of tooling credits. When presenting this package to multiple suppliers, keep the illustrative assumptions consistent to ensure direct comparability of quotes.

What to Send with Your Inquiry

Provide a single, attached package containing everything a supplier needs to reply reliably. The goal is to remove ambiguity and reduce follow-up clarifications.

• Profile drawings: PDF for human review and one neutral 3D CAD file (STEP or Parasolid). Include revision history and scale notes.
• Assembly drawing(s): If the extrusion interfaces with other parts, include an assembly drawing showing mating parts and critical interfaces.
• BOM and quantities: Total order and forecast (e.g., 12‑month forecast), per‑length distribution and cadence.
• Material callout: Alloy and temper. If you allow equivalents, list acceptable alternatives and required certificates.
• Finish and pre‑treatment requirements: Color specs (RAL/FS), thickness ranges, pre‑treatment and test methods.
• Secondary ops drawings: Detail views with datums, GDT and true position tolerances; specify insertion or tapping details.
• Inspection plan or acceptance criteria: FAI requirements, dimensional criticality list, cosmetic zones and allowable defects.
• Packing and shipping instructions: Packing type, labelling and destination/incoterm. If export controlled, provide license references.
• Samples and approvals: If you require pre‑production samples, specify number, chargeability and sample approval route.
• Contractual terms: Payment terms, lead time expectations, warranty and rework policy.

If you prefer a supplier to propose surface finishing, include the functional requirement rather than a specific process—for instance, “marine‑grade corrosion resistance for 10+ years in coastal environment” rather than mandating a single finish. For custom profile work, consider noting the supplier’s capability to manufacture custom profiles: Custom Industrial Aluminum Extrusion Profiles and give them permission to propose minor design adjustments for manufacturability.

Frequently Asked Questions

1. Should I supply a 3D model or is a 2D drawing enough?

Provide both: a neutral 3D CAD file (STEP preferred) and a 2D PDF with callouts. The 3D model reduces interpretation errors for complex features; the 2D drawing documents inspection datums and tolerance intent.

2. Can a supplier substitute a different alloy if they claim equivalent properties?

Only if you explicitly allow substitutions and specify required mechanical properties and certification method. If you accept equivalents, require mill test reports and written confirmation of interchangeability for fit and finish.

3. How do I compare finish quotes between anodize and powder coat?

Compare by specifying the same acceptance criteria: film/thickness range, salt spray or adhesion tests if required, color standard and sample approval. Request pre‑production samples for final approval because appearance is subjective and process dependent.

4. What inspection samples should I require for first production?

A common approach is a first article inspection (FAI) on a small production batch with a CMM report for critical dimensions and a visual report for cosmetic zones. Specify whether the FAI is a paid sample and who approves it.

5. Who typically owns the extrusion die and how should I handle tooling credits?

Tool ownership is negotiable. If the buyer pays tooling in full, require documented die storage and maintenance terms. If the supplier retains the die, negotiate re‑order discounts and die life expectations. State tooling ownership explicitly in the RFQ.

6. How should I request packing for export to minimize damage?

Specify crate construction, internal protection, bundling limits, and moisture control (desiccant/vacuum pack) if necessary. Require marking for unpacking order and include any handling or lifting points in the packing instructions.

7. What lead times should I expect for prototype vs production?

Prototype lead time includes die design, die manufacture and trial runs—typically longer per piece. Production lead times depend on existing die availability and finishing schedules. Ask suppliers to itemize lead times by phase (tooling, trial, first production).

Technical Reference and Scope

Use the following standards as references when drafting RFQ acceptance criteria, but do not imply automatic compliance; include whichever standards you require in your RFQ and ask suppliers to confirm capability and provide certificates where appropriate.

• General extrusion profile tolerances: ISO 6362‑4:2022 — consult the ISO catalog or search for the standard to confirm scope and applicability (ISO search: 6362‑4).
• Extruded bars, rods, profiles and tubes: ASTM B221‑21 covers extrusion requirements for various alloys—reference this if you need the ASTM structural extrusion baseline (ASTM search: B221).
• Decorative anodizing: ISO 7599:2018 describes the anodizing process scope for decorative finishes and acceptance; hard anodizing falls under different or additional process criteria (ISO search: 7599).

Scope limitations: citing these standards in your RFQ should be limited to the extent they apply to the specific product and process. Do not assume a supplier’s quote means the supplier has tested or certified parts to these standards unless the supplier explicitly states so and provides supporting documentation. Where tolerances, sampling plans, or finish performance are project‑dependent, state the exact test method, acceptance criteria and responsibility for testing to avoid misinterpretation.

Related Profiles and Services

Use these product pages to align the article’s engineering discussion with an orderable scope. Confirm final dimensions, alloy, temper, finish and processing against the issued drawing.

• Custom Industrial Aluminum Extrusion Profiles
• 4040 T-Slot Aluminum Extrusion Profile
• Casement Window Aluminum Profile System
• Aluminum Profile Powder Coating Service

Technical Reference and Scope

This guide is written for engineering and procurement planning. It does not replace an agreed drawing, system test, inspection plan, or contract specification. Where a project invokes a standard, confirm the current edition, product scope, test method, acceptance level, and customer-specific requirements before release.

• ISO 6362-4:2022 — reference source for the applicable product or inspection scope.
• ASTM B221-21 — reference source for the applicable product or inspection scope.