Who at an OEM decides that your part goes into their product? Often a design engineer, and often months before anyone in purchasing learns your name. That's what OEM marketing comes down to for a component maker or contract manufacturer: being the supplier an engineer can check and specify while the product is still being designed, so that when sourcing gets involved, your part or your process is already in the design.
The website does more of that work than most suppliers expect, because the engineer usually checks it before anyone at your company knows there's a project.
What does OEM marketing mean for a supplier?
The term also covers apps preinstalled on phones and the co-op marketing carmakers run with their dealers. This piece is about a third meaning: an industrial supplier selling into original equipment manufacturers, the companies that design a finished product and sell it under their own name. An OEM building packaging machines buys motors, castings, wire harnesses, sheet metal enclosures and machined parts from companies like yours.
Two kinds of supplier sit under that heading, and they get chosen differently. A catalog component maker gets designed in by part number: the engineer picks your sensor or bearing and it goes on the bill of materials. A build-to-print or contract manufacturer gets sourced against the OEM's own drawing: the engineer designs the part, and the question is who can make it to spec, repeatably, at volume. Most of what follows applies to both.
Who at the OEM decides, and when?
Rarely one person, and rarely all at once.
The design engineer tends to come first. They're choosing a part or a process while the design is still moving, often long before production volumes exist. They want to know whether your part fits, whether you can hold the tolerance, and how quickly they can get a sample.
Supplier quality and purchasing come in too, in an order that varies. At larger OEMs, a company that isn't already an approved supplier usually has to register in the OEM's supplier portal and pass a quality survey or audit before it can be sourced at all. Some make registering your capabilities in that portal the first step, and only get in touch if a matching bid opportunity comes up. An engineer's interest is often what starts that process, not a way around it.
In automotive, purchasing usually awards the business before the supplier runs the Production Part Approval Process (PPAP), the AIAG standard that demonstrates the supplier's manufacturing process meets the engineering design record and specification requirements. In aerospace, the familiar gate is first article inspection, documented to SAE AS9102, and some primes also require the aerospace version of PPAP, AS9145. At a smaller equipment OEM, one buyer may do both jobs. And for build-to-print work at a large OEM, a commodity buyer may run the search with engineering signing off.
Once a part is approved, it tends to stay put, because changing the supplier of an approved part generally means going through approval again. That's the same requalification cost that keeps existing work in place when a customer contact changes. It cuts both ways. It's why OEM accounts are worth having, and it's why the time to win one is early, while the design is still open.
What does an OEM engineer check before designing a supplier in?
The general engineering screen is covered in what engineers check, and what gets you cut. An OEM engineer runs that same screen, then adds questions that come from the part living inside their product for years.
- Will approval be a problem? Say which approval packages you've produced: PPAP submissions (including AS9145 for aerospace customers that require it), AS9102 first article reports, material certs, and whether you've worked under a medical device customer's quality requirements. An engineer who expects PPAP and finds no mention of it may assume they'll be teaching you how.
- Will prototypes match production? A prototype made one way and a production part made another is a familiar source of trouble at approval. Say whether prototypes are made with production-intent material and process, how you handle the move from prototype to production tooling, and what prototype lead time looks like.
- Will you help with the design? Design for manufacturability (DFM) feedback is often why an engineer picks one supplier over another offering a similar service: someone who spots the tolerance that doubles the cost, or the feature that can't be made in one setup, before the design is locked. If you do this, say so, and say who does it.
- Can you scale with the program? A part that ships forty pieces for validation may need thousands a month after launch. Name the volume range you're set up for and the secondary operations you do in house.
- Can I drop your part into my model? For catalog components, downloadable CAD models in the formats engineers use are often the deciding step. Once your part sits in their assembly model, taking it out means redoing that corner of the design, and most engineers would rather not. For build-to-print suppliers, the equivalent is a quote path that accepts STEP files and full drawing packages.
- Which certifications, for what scope? IATF 16949 for automotive, AS9100 for aerospace, ISO 13485 for medical devices, each with the processes it covers, placed where the engineer looks first rather than in the footer.
Where do OEM engineers find suppliers?
Through a handful of routes: a colleague's recommendation, a supplier already on the approved list, a manufacturer's rep who covers the territory, an industrial directory, a trade show, a distributor's line card, and search. More of them now also compare suppliers with AI tools before contacting anyone.
Unless you're already on their approved list, most of those routes end in the same place: the engineer opens your website to see whether it holds up for their part.
Why does the website have to work before purchasing shows up?
Because the engineer visits when you can't see them, and purchasing often visits after the decision that mattered most.
When the RFQ finally arrives, it lists the part, the quantities and the approval requirements, but not how many suppliers were ruled out months earlier, or why. The shortlist forms before the request goes out.
The site also has more than one reader across the life of a program. The engineer checks capability. Supplier quality looks for the certifications and approval history they'll later verify against the certificate itself and the registry behind it, such as the IAQG's OASIS database for AS9100. Purchasing looks for signs you're a stable company worth depending on. A year later, someone new in the engineer's seat checks why you were chosen. Hardly any of them tell you they came.
The website doesn't replace any of that. Portal registration, the quality audit and the certificate check all happen on the OEM's side, on its terms. What the site can do is make the engineer and the sourcing lead want you in that process before either of them has spoken to you. In practice that's a manufacturing site built around capability, quality and industry pages, with industry pages that name the parts you've made for each sector and the approvals that came with them.
How does a design-in win show up?
Usually late, and rarely as a form fill. When the site does its job in an OEM program, the result tends to arrive months afterwards and look like something else: a sample request from an engineer you've never spoken to, a supplier survey from their quality team, or an RFQ with your part number already on the bill of materials. Little of that traces back cleanly to a page view, so contact-form volume tends to undercount what the site is doing.
So judge the OEM pages on what they answer, not on this quarter's enquiries. An engineer designing next year's product may be reading them now.
