Quick Answer: What Should an OEM Metal Fabrication RFQ Include?
A complete metal fabrication RFQ should include the latest 2D drawing, a matching 3D CAD file when available, part number, revision and units; the material grade and stock form; prototype or production quantity; critical dimensions and tolerances; welding and finishing requirements; inspection and documentation needs; assembly scope; packaging and labeling instructions; and the requested delivery schedule or batch-release plan. These inputs help a manufacturer map the required cutting, bending, machining, welding, finishing and inspection steps. When details are missing, the supplier has to ask questions, state assumptions or exclude work from the quotation.
Start With Controlled 2D Drawings and 3D CAD Files
The drawing package is the technical basis of the RFQ. It should tell the supplier which geometry is current and which requirements control production. If several files are sent without a clear revision, quotation work can begin from the wrong design even when each file opens correctly.
What the 2D Drawing Should Define
The 2D drawing should carry the requirements that cannot be understood from shape alone: dimensions, critical tolerances, weld symbols, threads, hole specifications, surface requirements and manufacturing notes. Identify the features that affect function or assembly rather than applying the tightest tolerance to every dimension.
Where a part belongs to an assembly, show the interfaces that matter. Mating surfaces, hole patterns, datum relationships and clearance areas often affect both the manufacturing route and the inspection plan.
What the 3D CAD Model Helps Define
A 3D model helps the supplier interpret geometry, bends, machining features, part interfaces and spatial relationships within an assembly. It can also make it easier to review tool access, forming direction and possible interference between components.
The model should not be the only place where critical manufacturing requirements exist. A useful RFQ makes clear which document controls if a CAD model and a drawing do not agree. Buyers working under build-to-print manufacturing should also identify any controlled notes or specifications that the supplier must follow.
Confirm Revision, Units and File Consistency
Before sending the package, compare the drawing revision with the CAD revision. Confirm the part number, assembly number and whether dimensions are in millimeters or inches. Remove obsolete files from the RFQ package, or mark them clearly if they are included only for reference.
A short revision note can prevent a long clarification chain. The important point is not the file naming convention; it is that the buyer and supplier can identify the same released design.
Define Material and Production Volume
Material Specification and Stock Form
State the required material grade, not only a broad family such as steel, stainless steel or aluminum. When relevant, also identify the expected stock form—sheet, plate, tube or bar—and the required thickness or section.
If an equivalent material may be considered, say who can approve the change. Leaving substitution open without an approval path creates uncertainty in raw material purchasing, processing and quotation scope.
Prototype, Batch Quantity and Expected Volume
Quantity affects how the work may be planned. A prototype, a one-time batch and repeat releases can justify different setup, fixture, raw-material purchasing and production approaches. Provide the quantity required for the current RFQ, the expected batch size and annual volume when it is known.
Volume information does not lock the buyer into a forecast. It gives the supplier enough context to evaluate whether the proposed method fits the likely production pattern. If the part may require several processes, the current OEM metal fabrication capabilities page provides the relevant process context without replacing the technical RFQ.
Identify Critical Dimensions and Assembly Relationships
Not every dimension carries the same manufacturing risk. Mark the features that control fit, motion, sealing, alignment or interchangeability. Typical examples include mating surfaces, hole locations, interfaces and critical-to-function dimensions.
This distinction helps the supplier evaluate setups, workholding and inspection effort. It also reduces the chance that a general tolerance is interpreted as equally important across the whole part.
For fabricated assemblies, state whether the requirement applies before or after welding, finishing or final assembly. A dimension checked on an unfinished component is not always equivalent to the same dimension on the completed assembly.
Specify Welding and Downstream Process Requirements
Welding Requirements
Show weld location, size and symbol on the controlled drawing where applicable. Include appearance, grinding or sealing requirements only when the project needs them. If a weld must remain untouched, or if an area must be kept clear for assembly, state that as well.
The supplier should not have to infer whether a drawing calls for structural joining, a sealed joint or a cosmetic finish. Those choices can change joint preparation, access, sequence and post-weld work.
Surface Treatment and Heat Treatment
Name the required process, such as powder coating, zinc plating or galvanizing, and provide the controlling specification when one exists. Define color, appearance, masking, protected threads or contact surfaces as needed. Include heat treatment only when it is part of the project.
“Painted” is often too open-ended for quotation. It does not tell the supplier what coating system, finish condition or protected areas the buyer expects.
Assembly and Supplied Components
List welded nuts, fasteners, purchased components and customer-supplied items that belong in the final assembly. Identify who purchases each item and whether the quotation should cover subassembly or complete final assembly.
Downstream requirements are easier to evaluate when they are visible from the start. The documented custom fabricated frame assembly case study shows a real sequence linking material preparation, tube laser cutting, parts review, fixture-based robotic welding, post-weld checks, galvanizing and packing. Each stage needs different inputs from the buyer; none should be assumed from the word “fabrication” alone.
Define Inspection, Documentation and Special Requirements
Inspection and Documentation Scope
State which features require dimensional inspection and whether an inspection report, first-article inspection requirements, if required, material certificate or defined checkpoint is required. These items should be requested only if the project needs them. The RFQ should distinguish required records from routine supplier process control.
Also identify the condition in which the product must be inspected. If a critical dimension can change during welding, coating or assembly, the buyer should say when acceptance applies.
Customer or Industry Requirements
Attach customer-specific drawing, documentation, packaging or labeling standards that apply to the work. Cite the correct revision and identify any approval or traceability requirement. Do not assume that a supplier will know an internal standard from an abbreviation alone.
If a requirement is still under review, flag it as open. A conditional item is easier to manage than a requirement introduced after the quotation scope has already been agreed.
Clarify Packaging, Labeling and Delivery Requirements
Packaging is part of the manufacturing scope when it affects handling, protection or identification. State whether parts must be separated, protected from surface contact, packed by quantity, labeled by part or lot, or prepared for a particular handling method.
The RFQ should also identify the destination, requested schedule and whether the order will ship in one lot or in batch releases. Special protection and label formats should be supplied with the RFQ rather than added after production planning.
These details matter even when they do not change the part itself. They can add materials, handling steps, labeling work and coordination to the quotation.
How Complete RFQ Information Improves the Quotation Process
Complete information helps the supplier connect the drawing to the actual production scope. The manufacturer can review which cutting, forming, machining, welding, finishing, inspection and packing steps may be required, then evaluate setups, fixtures and secondary operations in that context.
It also makes exclusions visible. When both sides understand what is included, the quotation is easier to compare with other offers and less likely to change because a required operation was omitted.
Clear inputs do not guarantee a fixed quotation time or price. They reduce the number of assumptions and can shorten the communication cycle by focusing questions on genuine technical decisions.
What Happens When RFQ Information Is Incomplete?
An incomplete RFQ does not always prevent a quotation, but it changes its quality. The supplier may need to state material or process assumptions, exclude finishing or documentation, or ask the buyer to clarify drawings and quantities. If the missing item changes later, the quotation may need revision.
The practical response is to identify what is known, what is open and who can approve a decision. That gives the supplier a controlled basis for review without pretending that every detail has been finalized.
Final OEM Buyer Checklist Before Sending the RFQ
Use this checklist before releasing the package:
- Latest 2D drawing and revision
- Matching 3D CAD file
- Part and assembly numbers
- Units: millimeters or inches
- Material grade and specification
- Stock form or thickness when relevant
- Prototype or production quantity
- Expected batch size and annual volume, if known
- Critical dimensions and tolerances
- Mating features and assembly relationships
- Welding locations, symbols and finish requirements
- Surface treatment and heat treatment, if required
- Inspection checkpoints and acceptance condition
- Required inspection reports, material certificates, or first-article requirements
- Assembly scope, fasteners and supplied components
- Packaging and surface-protection requirements
- Part, lot or package labeling
- Shipping destination
- Requested schedule or batch-delivery pattern
- Customer-specific standards and current revisions
The checklist does not replace the drawing. It confirms that the commercial request, controlled design and downstream production requirements describe the same scope.
Send Your Drawings for Process Review
When the package is ready, you can send your drawings and RFQ requirements for manufacturing and quotation review. Include open questions as well as confirmed requirements so the review team can identify what still needs to be resolved.