The quality of your Request for Quote (RFQ) directly determines the quality of the quotes you receive. A vague or incomplete RFQ leads to inflated pricing, misunderstood requirements, and wasted time for both you and the supplier. A well-structured RFQ, on the other hand, gets you accurate pricing, realistic lead times, and confident suppliers who understand exactly what you need.
Whether you're sourcing CNC turned parts, milled components, or complex Swiss-type machined pieces, this guide will show you exactly what to include in your RFQ to get the best possible response from machine shops — especially when working with international suppliers in Taiwan or other Asian manufacturing hubs.
Most buyers underestimate how much their RFQ quality affects the quote they receive. Here's the reality: when a machine shop receives an incomplete RFQ, they have two choices — ask clarifying questions (which delays everything) or add a "risk premium" to their pricing to cover unknowns.
A survey of CNC shop owners found that 60-70% of initial RFQs are missing critical information. The shops that receive better-structured RFQs consistently provide more competitive pricing because they can accurately estimate costs without padding for uncertainty.
Think of it this way: you're not just asking for a price — you're giving the supplier enough information to make a confident commitment. The more confidence they have in understanding your requirements, the tighter they can price the job.
This is the single most important element. Your drawing is the legal document that defines what you're buying. At minimum, include:
If you don't have formal engineering drawings, at the very least provide a dimensioned sketch with critical tolerances called out. But be aware that informal sketches often lead to misinterpretation — especially across language barriers. For guidance on specifying tolerances correctly, see our CNC machining tolerance guide.
Don't just say "stainless steel" or "aluminum." Specify the exact grade:
If you need a material certification (MTR/mill cert), state this explicitly. Also mention if you have flexibility on material grade — this gives the supplier room to suggest a more cost-effective or readily available alternative.
Pricing varies dramatically with quantity. Always specify:
This helps the supplier optimize their quoting — they may use different tooling strategies, batch approaches, or machine selections depending on volume. For more on how quantity affects pricing, read our CNC machining cost breakdown.
Clearly distinguish between:
Over-tolerancing is the #1 cost driver in CNC machining. If every dimension on your drawing has ±0.01mm tolerance, either you genuinely need that (expensive) or your drawing doesn't reflect actual functional requirements. Good suppliers will ask about this — great ones will suggest where tolerances can be relaxed to save cost.
Specify the required surface finish using Ra values:
Also specify any post-machining treatments: anodizing, plating, heat treatment, passivation, etc. These significantly affect cost and lead time.
Define what quality documentation you need:
If you require specific inspection methods (e.g., CMM measurement, optical inspection), state this upfront. Some shops charge extra for comprehensive inspection reports, and it's better to know this before committing.
Struggling to organize your quality requirements? The CNC Factory Audit Checklist ($7.99) helps you systematically evaluate supplier quality capabilities before placing orders.
Be specific about:
If your parts need to comply with specific industry standards, list them:
Include your expectations for:
This seems obvious, but many RFQs lack:
The CNC Email Templates ($4.99) pack includes ready-to-use RFQ emails, follow-up templates, and negotiation scripts that work especially well with Asian CNC suppliers.
A 3D model shows geometry but doesn't communicate tolerances, surface finish, thread specifications, or material requirements. Without a 2D drawing, the supplier has to guess — and they'll guess conservatively (expensive).
If your drawing doesn't call out a general tolerance standard (like ISO 2768-m), the supplier doesn't know what precision level to target for un-dimensioned features. This leads to inconsistent quoting between suppliers.
Always ask for pricing at 2-3 quantity levels. This reveals the setup cost vs. per-piece cost structure and helps you plan economically. A part that costs $15 each at 100 pieces might drop to $4 each at 5,000 pieces.
Heat treatment, plating, anodizing, laser marking, assembly — if these are needed, include them in the RFQ. Finding out after the fact that your supplier doesn't offer anodizing means extra logistics, cost, and lead time.
"ASAP" is not a delivery requirement. Specify actual dates. Suppliers prioritize jobs with clear, firm deadlines. Vague timelines get vague priority.
| Category | Item | Included? |
|---|---|---|
| Technical | 2D drawing (PDF) with dimensions & tolerances | ☐ |
| Technical | 3D model (STEP/IGES) | ☐ |
| Technical | Material grade specified | ☐ |
| Technical | Surface finish (Ra value) | ☐ |
| Technical | Secondary operations listed | ☐ |
| Technical | Thread specifications | ☐ |
| Technical | General tolerance standard noted | ☐ |
| Commercial | Quantity (multiple levels) | ☐ |
| Commercial | Annual usage estimate | ☐ |
| Commercial | Target delivery date | ☐ |
| Commercial | Shipping/Incoterms | ☐ |
| Commercial | Payment terms | ☐ |
| Quality | Inspection requirements | ☐ |
| Quality | Certifications needed | ☐ |
| Quality | Material cert required (MTR) | ☐ |
| Admin | Contact info & decision timeline | ☐ |
| Admin | NDA if applicable | ☐ |
Want all the templates, checklists, and calculators in one package? The CNC Buyers Toolkit Bundle ($24.99) includes RFQ templates, supplier scorecards, cost calculators, negotiation scripts, and more — everything you need to source CNC parts like a pro.
PartNumber_RevB_Drawing.pdf, PartNumber_RevB.stepYour cover email should summarize the key points without requiring the supplier to open every attachment just to understand the scope. Include: number of parts, materials, approximate quantities, and timeline. This helps the supplier's sales team route your RFQ to the right engineer quickly.
A good practice is to send your RFQ to 3-5 qualified suppliers. Fewer than 3 and you lack comparison data. More than 5 and you're creating unnecessary work for yourself (and the suppliers). If you're evaluating CNC shops for the first time, our guide on how to choose a CNC machine shop can help you build your shortlist.
When quotes come back, resist the urge to simply pick the lowest number. Compare:
Use the CNC Supplier Scorecard ($5.99) to systematically compare quotes across multiple criteria — price, quality capability, lead time, communication, and certifications — so you can make data-driven supplier decisions.
When sending RFQs to overseas CNC suppliers — particularly in Taiwan, China, or other Asian manufacturing countries — keep these additional points in mind:
Taiwan-based suppliers like KING HAN generally operate to international standards (ISO, ASTM) and communicate fluently in English, which significantly reduces the friction common with some other Asian sourcing destinations.
Here's a framework you can adapt:
Subject: RFQ — [Part Name/Number] — [Quantity] pcs — [Your Company]
Dear [Supplier],
We are looking for a CNC machining partner for the following part(s):
Part: [Name/Number, Rev]
Material: [Grade, e.g., SUS 304]
Quantity: Please quote [100 / 500 / 2,000] pcs
Annual Usage: ~[X] pcs/year
Tolerance: General per ISO 2768-m; critical dimensions per drawing
Surface Finish: [Ra value] + [any treatment]
Delivery: Need by [date]; [FOB/CIF] to [location]
Quality: Dimensional report required; material cert required
Please find attached: 2D drawing (PDF), 3D model (STEP).
Kindly reply by [date] with unit pricing, tooling cost, and lead time.
[Your Name, Title, Company, Contact]
Use the CNC Cost Calculator ($9.99) to estimate machining costs before sending your RFQ. Knowing your target price puts you in a stronger negotiation position.
The effort you put into your RFQ directly translates to the quality of quotes — and ultimately, the quality of parts — you receive. Take the extra 30 minutes to prepare a thorough RFQ, and it will pay dividends throughout the entire project lifecycle.
KING HAN specializes in Swiss-type CNC turned parts from 3-25mm diameter, with 26 machines ready for production. Send us your drawing and we'll respond with a detailed quote within 24 hours.
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