Custom Enclosure RFQ Checklist
A useful enclosure RFQ does not have to be complete on day one. It needs enough controlled geometry, project context and quote-critical requirements for the reviewer to understand what is known, what is still open and what must be frozen later.
Missing information can be identified during review. Open items should stay visible instead of being guessed into the drawing, tolerance or process.
Engineering illustration of a reviewable RFQ starting package: enclosure geometry, CAD context, controlled drawing information and project-definition documents. It is not customer-project or production evidence.
A Useful Starting Package Does Not Have to Be Complete
The first objective is to make the geometry and quotation context reviewable. Do not delay the first engineering conversation just because every material, finish, tolerance or inspection item has not been frozen.
Geometry baseline
A STEP or other usable 3D model is often the fastest way to establish shape, interfaces and packaging space. A sketch or reference model can still be enough for an early feasibility review when the final CAD is not ready.
Controlled requirements
A controlled drawing or specification can carry revision, units, tolerances, threads, masking, marking, CTQs and other information that may not be unambiguous in the 3D model.
Program context
State whether the request is prototype, validation, pilot or repeat production and provide the quantity basis you actually want compared. Do not invent a universal quantity ladder.
If you already have enough information for review, the transactional handoff remains the Engineering RFQ page. This guide owns the preparation logic; Contact owns project submission.
Separate What Starts the Review From What Must Be Frozen Later
The strongest RFQ packages distinguish early review inputs from quotation-critical information and final release requirements. Treating every possible field as mandatory at the first contact usually creates unnecessary friction.
The table is a decision framework, not a universal contract checklist. Project complexity, process route, customer requirements and regulatory context can move an item earlier or later.
3D CAD and a Controlled Drawing Do Different Jobs
A reliable enclosure quotation often needs both geometry and requirement definition. Which files are necessary depends on what the project asks the supplier to understand, manufacture and verify.
3D CAD / STEP
- Defines the nominal geometry and spatial relationships.
- Helps reviewers assess machining, forming, extrusion or assembly feasibility.
- Does not automatically define every tolerance, thread, surface, marking, CTQ or inspection requirement.
Controlled 2D Drawing / PDF
- Defines revision, units and requirements that must be explicit.
- Can identify threads, critical tolerances, datums, masking, finish, markings and inspection notes.
- Does not universally replace the 3D model for complex geometry.
Build One Quote Basis That Can Be Reviewed and Compared
For a complex enclosure RFQ, a one-page Quote Summary / BOM can reduce interpretation gaps by putting document identity, inclusions, quantity basis, tooling/NRE, evidence scope and deviations in one controlled place. It supports quotation; it does not replace the released drawing, model or specification.
This artifact is based on PrecMade benchmark RFQ lessons and the current generic Quote Summary/BOM master. It is an example structure—not a claim that every project requires every field or that benchmark files are customer projects.
Quantity and Program Stage Change the Quote Basis
Prototype, validation, pilot and repeat-production requests do not automatically share the same route economics, tooling logic, evidence needs or delivery assumptions. State the program stage instead of forcing every project into one fixed quantity ladder.
If you want multiple quantity breaks, use the quantities that matter to your purchasing decision. Do not assume that 100 / 500 / 1,000 or any other fixed set is universal.
Call Out the Features That Actually Control Function
A useful RFQ does not tighten every dimension equally. Identify the features that control fit, assembly, sealing, electrical contact, appearance or verification—and leave ordinary geometry at an appropriate process-level tolerance unless a tighter requirement is justified.
Leave Open Items Open—Do Not Invent Precision
If a requirement is not yet known, the RFQ should say so. An explicit open item or supplier option is more useful than an arbitrary material, finish, tolerance or process choice that later has to be undone.
Fixed enough to quote
- Known geometry and revision basis
- Program stage / quantities
- Customer-required interfaces or CTQs
- Non-negotiable material / finish requirements
Open for supplier option
- Manufacturing route when not prescribed
- Equivalent material where acceptable
- Cost-down DFM alternative
- Inspection/report option when scope is not yet fixed
Freeze before release
- Approved revision and final configuration
- Accepted deviations / DFM changes
- Critical dimensions and verification basis
- Required evidence and commercial release scope
When the route itself is still open, use the Manufacturing framework to compare extrusion, billet CNC, sheet metal or die-cast architectures instead of forcing a process name into the RFQ too early.
A Quotation Is Not a Production Release
An RFQ can be deliberately incomplete enough to support review and pricing. Production release is different: the approved configuration, revision, deviations, evidence scope and commercial basis must be controlled before manufacturing commitments are treated as final.
Common RFQ Mistakes That Create Bad Quotes
Many quote problems start before price is discussed: uncontrolled revisions, missing units, false precision, silent assumptions or documents that mix quotation with production-release instructions.
RFQ Readiness Checklist
You do not need every answer before the first review. Use this checklist to decide whether the current package is reviewable and where the remaining gaps should be made explicit.
Choose the Next Step Based on What You Already Have
A reviewable RFQ is not the same as a production-release package. Move forward from the level of definition you actually have instead of inventing missing requirements just to make the document look complete.
Still defining the project
Use the starting-package and open-item sections above to separate what is known from what can remain open.
Continue the Checklist →Baseline mostly defined
Use the Project Definition Pack structure to align revision, BOM/inclusions, quantities, tooling and quote assumptions.
Review the Project Definition Pack →Files ready for review
Send the available CAD, drawing, project stage, quantities and requirements for a project-specific engineering RFQ review.
Start Engineering RFQ →