Buyer context
Who this guide is written for.
OEM buyers, repair workshops, equipment rebuilders, mining maintenance teams, and importers sourcing welded frames, hoppers, brackets, bases, guards, and drawing-based steel structures.
Custom steel fabrication RFQs often arrive with a drawing attached and a request for best price. That is a start, but it does not answer the questions that decide whether the quote is realistic. The supplier still has to review drawing revision, steel grade, welding symbols, datum faces, machining scope, coating, trial assembly needs, and shipping size.
Heavy-equipment parts add another layer of risk because the fabricated part may connect to pins, bearings, crawler frames, loader arms, hoppers, or bolted assemblies. A small welding distortion or hole position error can create a large installation problem.
The best RFQ packet makes the production route visible. It tells the supplier what must be cut, welded, machined, inspected, coated, packed, and marked before the part leaves the factory.
Product scope
Product scope this RFQ route can cover.
Mismatch risks
Where quotes usually go wrong.
The drawing is quoted without revision control.
- Cause
- The buyer sends an old PDF, a marked screenshot, or a drawing set without confirming the final revision.
- Buyer loss
- The supplier may quote or produce against an outdated hole layout, plate thickness, or welding detail.
- Control
- Send the latest drawing revision, mark critical changes, and separate reference drawings from production drawings.
Welding distortion is not considered before machining.
- Cause
- The RFQ lists dimensions but does not say which faces or holes must be machined after welding.
- Buyer loss
- Bolted interfaces, pin holes, or bearing seats may be out of position after fabrication.
- Control
- Identify datum faces, post-weld machining areas, fixture points, and tolerance-critical holes.
The coating quote hides surface-preparation differences.
- Cause
- The buyer asks for painted or galvanized parts without defining coating type, surface preparation, color, or thickness.
- Buyer loss
- Two quotes may look comparable but include different cleaning, primer, paint, or galvanizing scope.
- Control
- State surface treatment, color or standard, target coating thickness if required, masked areas, and packing after coating.
A part is too large or awkward for normal export packing.
- Cause
- The RFQ focuses on fabrication cost and ignores lifting points, crate size, container loading, or long-part protection.
- Buyer loss
- Packing cost, lead time, or freight route changes after the price has already been discussed.
- Control
- Share final dimensions, weight estimate if known, lifting requirements, stackability, and destination or container limit.
Machined parts and welded parts are quoted separately but must fit together.
- Cause
- Pins, bushings, bearing seats, or shaft interfaces are sourced under separate lines without assembly context.
- Buyer loss
- Each item may pass its own check but fail when assembled on the equipment.
- Control
- Send assembly drawings, mating part dimensions, fit tolerance, and any trial assembly requirement.
RFQ fields
Information to put in the first email.
| Scope | Send | Why it matters |
|---|---|---|
| Drawing package | PDF drawing, 2D or 3D file if available, revision number, critical dimensions, welding symbols, and assembly reference. | The supplier needs to know which file controls production and which drawings are only for context. |
| Material and cutting | Steel grade, plate thickness, profile cutting scope, bend radius if any, and substitute material limits. | Material and cutting route affect cost, tolerance, lead time, and whether substitution is acceptable. |
| Welding and machining | Weld type, machined faces, post-weld hole boring, tolerance-critical features, and fixture or datum notes. | Fabricated heavy-equipment parts often need machining control after welding. |
| Surface treatment | Paint, primer, galvanizing, blasted surface requirement, color, masked areas, and required coating document if any. | Surface treatment can change quote scope and packing method. |
| Inspection | Dimensional checkpoints, weld inspection request, fit check, trial assembly need, material certificate, and photo report request. | Inspection should focus on the points that control installation, not every non-critical dimension. |
| Packing and logistics | Quantity, estimated part size, destination port, crate or pallet requirement, part marks, lifting needs, and delivery target. | Large fabricated parts need packing and container planning before lead time is locked. |
Review route
How this RFQ should be cleaned up.
- Start with drawing status.Confirm whether the drawing is final for quotation, only a concept, or a reverse-engineering reference from an old part.
- Mark the features that control installation.Hole centers, pin bores, bearing seats, mating faces, and assembly clearances should be obvious before the supplier prices the job.
- Separate fabrication, machining, coating, and packing.A quote is easier to compare when the buyer can see which supplier included each production stage.
- Ask for technical questions before the final quote.A supplier that asks about datum, distortion, coating, and packing may be protecting the project rather than slowing it down.
- Confirm approval route for first pieces.For new fabricated parts, a first-piece inspection photo set or measurement report is often more useful than a rushed batch order.
Factory review points
Control points buyers should ask suppliers to check.
- Drawing revision, file type, and critical feature confirmation.
- Steel grade, plate thickness, cutting route, and bend detail review.
- Welding sequence, fixture points, datum faces, and post-weld machining plan.
- Hole center, pin bore, bearing seat, flatness, and assembly interface checks.
- Surface treatment, coating thickness or color notes, masked faces, and drying protection.
- Export packing, part marks, lifting points, crate size, and mixed-item separation.
FAQ
Common questions before sending this inquiry.
Can a custom fabricated part be quoted from a photo only?
A photo can start discussion, but a quote-ready review needs drawings or measured dimensions, material, thickness, welding scope, fit points, quantity, and surface treatment notes.
When should machining after welding be specified?
Specify it when pin bores, bearing seats, mounting faces, hole centers, or assembly surfaces must hold position after welding. Those features should be marked in the RFQ.
Why does packing matter for fabricated heavy-equipment parts?
Large or irregular fabricated parts can change crate design, loading method, part protection, and freight route. Packing should be reviewed before confirming delivery time.
Should coating be included in the first quotation?
Yes, if the buyer expects a finished part. State paint, galvanizing, primer, color, masked areas, and any coating document requirement so quotes are comparable.