Why Manufacturer Quotes Break Down: The RFQ Mistakes That Blow Up Cost and Lead Time

What's Actually Missing From Most RFQs

Think about what a manufacturer needs to quote accurately. They need to know not just what you want built, but how you want it built, to what standard, and in what quantity.

Most RFQs are missing at least half of this.

Drawings. A product photo is not a drawing. Even a rough CAD file beats nothing, but a proper 2D drawing with tolerances is what tells a factory whether they can actually make your part on their machines. Without it, they assume tolerances that suit them, not you.

Bill of Materials. A BOM that says "use standard components" is an invitation for substitution. Manufacturers will source whatever is cheapest and available. Sometimes that's fine. Often it isn't. If you don't specify components, you don't control the product.

Material and finish. "Aluminum" is not a material specification. Neither is "matte black." Alloy grades, surface treatments, coating thickness, texture standards — these all carry costs. A quote that doesn't account for them isn't quoting your product.

Test standards and QC criteria. Does the product need to pass drop tests? Ingress protection ratings? Electrical safety certifications? Each costs money to verify. If your RFQ doesn't mention them, the supplier won't price them in. You'll find out later, usually at the worst possible moment.

Packaging. Inner box, outer carton, foam inserts, retail-ready packaging — this can represent 8–15% of COGS for some consumer products. Almost always missing from first-draft RFQs.

Target quantity. "We'll start with a small run" is not a quantity. Pricing at 500 units looks nothing like pricing at 5,000. MOQ affects tooling amortization, material purchasing, machine setup time. The number you give changes the number you get back — significantly.

An incomplete RFQ is a bit like ordering a custom suit by telling the tailor you want "something blue and professional." They'll make something. It won't be what you imagined, and when you complain about the fit, the fault isn't theirs.

Why Low Quotes Are Often the Most Expensive Option

There's a whole category of supplier that is genuinely skilled at producing low initial quotes. They're not cheaper to work with. They're just better at hiding costs.

Here are some costs that routinely vanish from first-round quotes and resurface later.

Tooling. Injection molds, die casting molds, stamping dies — one-time costs that can run from a few thousand to tens of thousands of dollars. Some suppliers absorb them into unit price. Some quote them separately. Some don't quote them at all on round one, then introduce them as a "necessary addition" once you're committed. Always ask explicitly: is tooling included?

Waste and yield. Electronics assembly, PCB fabrication, and precision machining all have yield rates below 100%. Someone pays for defective units. If the supplier's quote assumes perfect yield and yours doesn't, you're going to have a disagreement about who covers the waste. Get the expected yield rate in writing.

Revisions. You will have revisions. Engineering change orders, spec updates, artwork changes — these all generate costs. Some suppliers build revision tolerance into their pricing. Many charge for each round. A low initial quote paired with high revision fees is a common model.

Logistics and duties. "Ex Works" pricing — where the supplier's responsibility ends at their factory gate — can look 20–30% cheaper than a delivered price. Until you add freight, customs duties, import tariffs, and last-mile delivery. When comparing quotes, make sure you're comparing on the same Incoterms.

QC and inspection. Third-party inspection costs money. If your supplier's quote doesn't include inspection and yours doesn't budget for it independently, one of you is assuming it won't be needed. That assumption is usually wrong. It's worth understanding what remote factory audits in China actually involve before you skip them.

The pattern holds across the industry. Suppliers who win on price often win because they've left out things you'll eventually pay for anyway. The real question isn't "which quote is lowest?" It's "which quote accounts for the most?"