Injection Molding RFQ Checklist: What to Send for an Accurate Mold and Part Quote

Quick Answer

For an accurate injection molding quotation, send your supplier the 3D CAD file, a revision-controlled 2D drawing, exact or target resin, annual and release volumes, cosmetic requirements, functional and assembly conditions, tooling requirements, secondary operations, quality and validation documents, packaging specifications, target timing, and relevant project background.

If some information is not yet available, say so clearly. A professional supplier can identify assumptions and open questions. What creates problems is not incomplete information by itself—it is an incomplete RFQ treated as if every requirement were already fixed.

When a new injection molding RFQ reaches me or our engineering team, I can usually tell very quickly whether we are looking at a quote-ready project or only the beginning of a technical discussion.

That does not mean every customer needs to arrive with a perfect specification package. Early-stage product teams often do not know the final resin, tooling standard, inspection plan, or annual demand. That is normal.

The real issue is whether the information that can change the mold structure, manufacturing process, unit cost, approval work, or delivery schedule has been identified.

I have seen buyers send the same CAD file to several suppliers and receive prices that differ dramatically. The immediate conclusion is often that one factory is expensive and another is competitive. Sometimes that is true. But just as often, the suppliers have quoted different assumptions:

• one quoted a single-cavity mold and another quoted four cavities;

• one included a branded hot runner and another used a cold runner;

• one included dimensional inspection and sample reports while another included only molded samples;

• one assumed a standard commercial resin while another quoted the specified certified grade;

• one priced an export mold and another priced a tool intended to remain in its own factory;

• one included secondary operations, packaging, and production molding while another quoted the mold only.

Those are not comparable quotations.

My purpose in this guide is to help you prepare an injection molding RFQ that produces fewer assumptions, fewer follow-up emails, and quotations you can evaluate on the same basis.

The 12 Inputs in a Quote-Ready Injection Molding RFQ

Send the Native 3D CAD File

For most injection mold quotations, a neutral solid model such as STEP is the most useful starting point. Parasolid, IGES, or a native CAD format may also be acceptable, depending on the software used by the engineering team.

A rendering, screenshot, STL mesh, or PDF illustration is usually not enough for a production mold quotation. It may show the appearance of the product, but it does not reliably support a complete review of:

• part volume and projected area;

• nominal wall thickness;

• undercuts and side actions;

• draft conditions;

• possible parting lines;

• gate and ejection options;

• ribs, bosses, snaps, threads and sealing features;

• mold shrinkage and dimensional relationships.

If the design is still changing, mark the file as a preliminary revision and tell the supplier which features remain open. A budgetary estimate can still be useful, but it should not be presented as a final production quotation.

Recommended file information

• Part name and part number;

• CAD revision;

• File format;

• Units: millimeters or inches;

• Date issued;

• Related assembly files, when available.

Include a Revision-Controlled 2D Drawing

The 3D model defines geometry. The 2D drawing defines what must be controlled.

This distinction matters. A supplier can measure every dimension in a CAD model, but that does not tell us which dimensions are critical to function, which tolerances are mandatory, which surfaces are cosmetic, or which datum structure governs inspection.

A useful 2D drawing should identify, as applicable:

• drawing and revision number;

• units and general tolerances;

• datums and geometric dimensioning and tolerancing;

• critical-to-quality or special characteristics;

• fit, sealing and assembly dimensions;

• thread and insert requirements;

• surface texture or polish;

• color and appearance zones;

• marking and labeling;

• material and compliance notes;

• inspection or test references.

Do not add a tight tolerance to every dimension simply to be safe. Plastic molded parts respond to resin shrinkage, geometry, orientation, temperature, moisture, aging, and measurement conditions. ISO 20457 addresses dimensional and geometrical tolerances and acceptance conditions for plastic molded parts, but the drawing and contractual requirements still need to reflect the actual function of your product.

If only a few dimensions determine whether the part works, identify them clearly. This helps the supplier focus DFM, mold construction, process development, inspection, and capability work where they matter most.

Specify the Resin—Not Just the Polymer Family

“ABS,” “nylon,” or “PC” is not always a complete material specification.

Different grades within the same polymer family can have different shrinkage, viscosity, impact strength, heat performance, flame rating, UV stability, glass-fiber content, color behavior, and regulatory documentation. Those differences can change the mold design, steel selection, venting, runner and gate strategy, processing equipment, unit cost, and validation plan.

When known, provide:

• manufacturer and exact grade;

• base polymer;

• filler or reinforcement percentage;

• flame-retardant requirement;

• UV, impact, chemical or temperature requirement;

• color or masterbatch specification;

• permitted or prohibited regrind;

• required CoA, CoC, SDS, declaration, or test report;

• applicable customer or market requirements.

If the grade is not yet selected, provide the operating environment and required performance instead of guessing. For example:

• continuous and peak temperature;

• mechanical load and impact;

• chemical or cleaning-agent exposure;

• outdoor UV exposure;

• electrical insulation or flame requirements;

• skin contact or application-specific restrictions;

• appearance and color requirements.

The supplier can then discuss candidates, but final material selection and product compliance remain part of the customer’s design and approval process.

Provide Annual Volume and Typical Release Quantity

“Please quote 10,000 pieces” does not tell the whole production story.

We need to understand whether 10,000 pieces is:

• a one-time order;

• a monthly release;

• the first year’s forecast;

• an initial market test;

• one part within a larger product family.

Annual volume affects cavity count, mold steel, runner strategy, cooling, automation, expected maintenance, capacity planning, and the balance between tooling investment and unit cost. Release quantity affects material purchasing, setup cost, inspection, packaging, inventory, and production scheduling.

Provide three numbers when possible:

1. expected annual volume;

2. typical order or release quantity;

3. three-year demand range or growth scenario.

If your forecast is uncertain, show a realistic range—for example, pilot demand, expected demand, and upside demand. A range is more useful than an aggressive number selected only to obtain a lower piece price.

Define Surface Finish, Color and Cosmetic Zones

Cosmetic requirements should be visible in the RFQ, not introduced after the mold is built.

A glossy consumer-electronics housing, a textured industrial cover, and a hidden structural bracket may use similar materials and overall geometry, but they do not require the same gate strategy, steel preparation, polishing, ejector placement, defect limits, handling, packaging, or inspection.

Identify:

• Class A or customer-visible surfaces;

• hidden or non-cosmetic surfaces;

• SPI, VDI, Mold-Tech, or customer-specific finish;

• gloss range, if controlled;

• Pantone, RAL, masterbatch, or physical color standard;

• painted, printed, plated, laser-marked, or decorated areas;

• acceptable location of gate vestige, ejector marks and parting line;

• visual defect standard or approved limit samples;

• lighting and viewing conditions when appearance is critical.

Do not rely on the word “perfect.” It is not an inspection specification. If appearance affects acceptance, define how the customer and supplier will make the same decision.

Explain How the Part Functions and Assembles

CAD tells us what the part looks like. Product context tells us what failure means.

If possible, share the mating components or at least explain:

• where the part is supported or loaded;

• which surfaces locate the assembly;

• whether it seals against air, water, dust, or another fluid;

• where screws, clips, ultrasonic welds, adhesives, or inserts are used;

• whether the part must remain flat;

• whether distortion affects PCB, connector, gear, lens, gasket, or enclosure fit;

• operating temperature, chemical exposure, impact, vibration, and service life;

• required functional or assembly tests.

This information can change how we review ribs, bosses, wall thickness, weld-line location, fiber orientation, gate position, cooling, tolerances, and inspection fixtures.

If confidentiality prevents you from sharing the complete product, a simplified assembly envelope or redacted functional description is still better than no context.

Define the Tooling Scope and Mold Destination

One of the most important RFQ questions is simple:

Will the mold remain at the supplier for production, or will it be exported to another molding facility?

An export mold must match the receiving factory’s equipment and standards. Provide, when applicable:

• required mold base standard;

• preferred component brands;

• platen size and tie-bar spacing;

• locating ring and sprue dimensions;

• nozzle radius;

• ejector interface;

• electrical voltage and connector standard;

• hydraulic or pneumatic connection requirements;

• hot-runner controller and connector specification;

• water-line and manifold standard;

• crane, lifting and safety requirements;

• mold identification and labeling;

• spare components and documentation;

• export packing requirements.

If the mold will remain with the supplier, the quotation should still define ownership, storage, maintenance, repair responsibility, change control, production use, and transfer rights.

For an existing mold transfer, add the tool drawing, mold dimensions and weight, maintenance history, last acceptable samples, current process sheet, quality history, shot count if recorded, spare parts, and known problems. A transferred mold should be reviewed as a technical onboarding project, not treated as an ordinary repeat-production order.

List All Secondary Operations and Assembly

The molded component may be only one stage of the delivered product.

Tell the supplier if the quote should include:

• insert loading or insert molding;

• overmolding;

• trimming or machining;

• ultrasonic, vibration, hot-plate, or laser welding;

• pad printing, screen printing, hot stamping, painting, coating, or plating;

• laser marking;

• adhesive application;

• purchased components;

• subassembly or final assembly;

• leak, torque, pull-out, electrical, functional, or appearance testing.

Secondary processes may require dedicated fixtures, external suppliers, extra handling, different inspection points, yield allowances, and additional approval samples. If they appear only after the mold quotation, both cost and timing will change.

State the Quality and Validation Requirements

Do not ask for “full quality documents” without defining what full means for your program.

A standard industrial housing, a customer-visible electronics enclosure, and an automotive component may require very different approval packages.

Your RFQ should state which of the following may be required:

• DFM report;

• Moldflow or other simulation;

• material certification or batch documentation;

• first article inspection;

• full or selected dimensional report;

• cavity-by-cavity results;

• gauge or fixture development;

• measurement-system analysis;

• process flow diagram;

• PFMEA and control plan;

• capability study for agreed critical characteristics;

• PPAP submission elements and level;

• functional, environmental, assembly, or packaging tests;

• retained samples and record-retention period;

• lot identification and traceability;

• outgoing inspection and shipment documents.

PPAP, for example, is a production-part approval process intended to demonstrate that engineering design records and specification requirements can be consistently met during an actual production run at production rates. The customer must define whether PPAP applies, the submission level, customer-specific forms, special characteristics, and approval requirements. “PPAP required” by itself is not a complete scope.

Quality requirements affect quotation because they require engineering time, production time, samples, measurement, gauges, records, and sometimes external testing.

Include Packaging, Labeling and Shipping Requirements

Packaging is not something to decide after production if the part has cosmetic surfaces, delicate clips, a tendency to deform, or customer-specific labeling.

Specify, where relevant:

• pieces per bag, tray, carton, or pallet;

• layer separators or individual protection;

• orientation and stacking limits;

• returnable or disposable packaging;

• moisture, rust, dust, ESD, or UV protection;

• barcode, lot, date, country-of-origin, or customer labels;

• pallet size and height restrictions;

• shipment destination and Incoterm;

• air, sea, courier, or customer-forwarder arrangement.

For large or dimensionally sensitive plastic parts, packaging trials may be necessary because a part that passes inspection at the machine can still deform during storage or transportation.

Define Required Milestones—Not Just One Final Date

“Need parts in six weeks” is not enough to build a responsible schedule.

Tell the supplier which date matters:

• quotation required;

• DFM review;

• mold design approval;

• T1 sample dispatch;

• engineering samples received;

• customer testing complete;

• pilot production;

• production approval;

• first production shipment;

• product launch.

Also clarify what event starts the tooling lead time. Is it purchase order, deposit, final CAD, closed DFM, or approved mold design?

I prefer to discuss these milestones openly before an order. A supplier that simply repeats the requested date without checking design maturity, steel and component availability, inspection scope, trial iterations, sample transport, and customer approval time is not giving you a schedule—it is giving you a sales answer.

Explain the Project Status and Commercial Context

Two parts with the same CAD can require different proposals because the business situation is different.

Tell the supplier whether the project is:

• a new product before design freeze;

• a prototype moving toward production;

• a replacement for an existing product;

• a cost-reduction program;

• a second-source qualification;

• an existing mold transfer;

• a production rescue after quality or delivery failure;

• tooling-only for molding in another country;

• tooling plus repeat part production.

You do not need to disclose confidential commercial information that is irrelevant to the quote. But the supplier should understand the decision you are trying to make.

For example, a second-source project may need comparison to an approved sample and current process. A transfer program may require buffer stock and requalification. A launch program may prioritize design feedback and schedule risk. A cost-reduction project requires a clear current baseline; otherwise the supplier cannot tell whether a proposed saving changes quality, tooling, material, or logistics.

Minimum RFQ vs. Quote-Ready RFQ

Not every project begins with all 12 inputs. The table below shows the difference between a useful early request and a production-ready quotation package.

A budgetary quotation is not useless. It can help a product team compare concepts or decide whether to continue development. The important point is to label it correctly and record the assumptions that must be closed before tooling begins.

Seven RFQ Mistakes That Create Misleading Quotes

Sending only a screenshot or STL

This may support an initial conversation, but it rarely supports reliable tooling and tolerance review.

Asking every supplier to “quote your best option”

If you do not define the decision criteria, each supplier may optimize for something different: lowest mold price, lowest unit price, shortest T1 date, longest tool life, or easiest construction.

Giving annual volume without release quantity

A project consuming 120,000 parts per year in monthly releases is different from one requiring all 120,000 pieces in a short seasonal window.

Naming a polymer but not a grade

The quoted material and the designed shrinkage may not match the grade later approved by your engineering or compliance team.

Adding cosmetic requirements after mold design

Late appearance requirements can change the gate, parting line, ejector layout, polishing, texture, handling, and packaging.

Writing “PPAP required” without a submission scope

PPAP levels, customer-specific forms, special characteristics, test requirements, sample quantities, and production-run conditions must be confirmed.

Comparing only the total price

A tooling quotation is meaningful only when you compare its assumptions, inclusions, exclusions, construction, validation, ownership, and responsibilities.

A Copy-and-Paste Injection Molding RFQ Template

You can use the following structure in an email or RFQ document.

Project Information

• Company:

• Contact name and role:

• Project name:

• Application / end use:

• Project stage:

• New tooling / existing mold transfer / second source:

• Confidentiality or NDA requirement:

Part Information

• Part name and number:

• 3D CAD revision:

• 2D drawing revision:

• Part dimensions and estimated weight, if known:

• Mating parts or assembly information:

• Critical dimensions / CTQs:

• Functional requirements:

Material and Appearance

• Resin manufacturer and grade, or performance target:

• Color specification:

• Filler / reinforcement:

• Regrind policy:

• Compliance or material documents required:

• Surface finish / texture:

• Cosmetic zones and appearance standard:

Volume and Tooling

• Estimated annual volume:

• Typical release quantity:

• Forecast range:

• Expected program life:

• Preferred cavity count, if fixed:

• Cold runner / hot runner preference, if fixed:

• Mold remains at supplier / export mold:

• Receiving-machine specifications, for export tooling:

• Required mold or component standard:

Secondary Operations

• Printing / painting / plating / marking:

• Welding / assembly / inserts:

• Purchased components:

• Functional tests:

Quality and Approval

• DFM required:

• Moldflow or simulation required:

• T1 sample quantity:

• FAI / dimensional report:

• Inspection standard and sampling plan:

• Gauge / fixture requirement:

• Capability / SPC requirement:

• PPAP level and customer-specific forms:

• Material and lot documentation:

• Traceability requirement:

Packaging, Delivery and Timing

• Packaging specification:

• Labeling requirement:

• Delivery destination:

• Incoterm:

• Target DFM date:

• Target T1 date:

• Target approval date:

• Target production shipment date:

Commercial Scope

• Mold only / parts only / mold plus production:

• Quote currency:

• Quotation validity requirement:

• Requested price breaks:

• Required spare parts:

• Any required exclusions or separate options:

What I Expect a Supplier to Return

A good RFQ should lead to more than one unexplained number.

Depending on project maturity, I would expect the supplier’s response to identify:

• the files and revisions reviewed;

• quoted resin and color assumptions;

• proposed mold construction and cavity count;

• runner, gate, side-action, insert, and major tooling assumptions;

• mold destination and machine compatibility assumptions;

• included trials, samples, inspection and approval documents;

• secondary operations and packaging included;

• tooling price and unit prices at defined quantities;

• lead-time start point, milestones, and exclusions;

• open technical and commercial questions;

• payment, ownership, maintenance, change, and warranty terms.

If important information is missing, the responsible response is not to hide the gap. It is to state the assumption, ask the question, or provide a budgetary option until the requirement is closed.

At ABERY, our new product development and DFM process is intended for projects that still need design and manufacturing decisions, while our integrated mold-to-production solution supports projects that need tooling, validation, and follow-on production within one coordinated program. Buyers can also review examples of our project and inspection documents before defining their RFQ package.

Frequently Asked Questions

Is a STEP file enough for an injection molding quote?

A STEP file is often enough for an initial geometry and moldability review, but it is usually not enough for a firm production quotation. A 2D drawing should define tolerances, datums, critical dimensions, material, finish, notes, and acceptance requirements. Volume, tooling scope, quality documents, packaging, and timing also affect the quote.

Can I request a quote if my design is not final?

Yes. Clearly identify the revision as preliminary and state which decisions remain open. The supplier can provide a budgetary estimate, DFM feedback, or alternative tooling concepts. Record every assumption and request a revised quotation after the design, material, volume, and approval scope are confirmed.

What if I do not know which plastic material to use?

Provide the functional conditions instead: temperature, load, impact, chemical exposure, UV, color, flame, electrical, appearance, and application-specific requirements. A molder can help compare candidates, but the customer must approve the final grade and confirm that it meets product, market, and regulatory requirements.

Should I provide annual volume or only the first order quantity?

Provide both. Annual volume helps determine cavity count, tool construction, automation, and capacity. Release quantity helps determine setup allocation, material purchasing, inspection, packaging, inventory, and unit price. If demand is uncertain, provide a realistic low, expected, and high range.

Do I need a 2D drawing if all dimensions exist in the CAD model?

Yes, when tolerances and acceptance matter. The 2D drawing identifies the controlled revision, datums, critical characteristics, geometric tolerances, material and surface notes, and inspection requirements. Without it, the supplier may quote standard assumptions that do not match the product’s functional needs.

Should an NDA be signed before I send CAD files?

If the design is confidential, agree on an appropriate NDA or confidentiality arrangement before sharing sensitive files. Confirm the legal entities, permitted purpose, authorized recipients, storage, subcontractor access, return or deletion terms, and governing requirements relevant to your business.

What should I send when transferring an existing mold?

In addition to part drawings and demand, send the tool drawing, mold dimensions and weight, receiving-machine requirements, maintenance and repair history, current process sheet, last acceptable samples, inspection data, quality history, spare-parts list, recorded shot count, and known issues. The new supplier should complete an incoming inspection and requalification plan before committing to production.

How long should an injection molding quotation take?

It depends on file completeness and project complexity. A simple part with released drawings and a defined material can be reviewed faster than a multi-part assembly requiring Moldflow, special tooling, automation, secondary processes, gauges, PPAP, or external quotations. Ask the supplier to acknowledge the RFQ, identify missing information, and confirm when a responsible quotation can be completed.

Final Advice From My Side of the Quotation Table

The best RFQ is not necessarily the longest document. It is the one that makes the important decisions visible.

If your project is early, say what is still open. If a requirement is mandatory, identify it before the supplier chooses the mold concept. If you want to compare quotations, make sure every supplier is pricing the same scope.

That discipline saves more than quotation time. It reduces design changes, commercial disputes, validation gaps, and surprises after the mold is already being built.

If you are preparing a new mold, transferring an existing tool, or planning mold plus production, you can send ABERY your RFQ and files for an engineering review. Please include the information available today; we will identify the remaining questions before confirming the quotation scope.

References

• ISO 20457:2026 — Plastics moulded parts: tolerances and acceptance conditions

• AIAG — Production Part Approval Process

• Autodesk — Design for Manufacturing