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Marketing to engineers: what technical buyers check before they call

Marketing to engineers means giving them what they check: numbers, standards, limits and proof, on pages they can read without calling you. Engineers read a supplier's website the way they read a drawing, and they skip the adjectives. This guide covers how they research, what they trust and what to put on your site. Checked October 2026.

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Sheet 103, The Untoleranced Dimension: REV A as said beside REV F released Two-panel drawing. Left, REV A as said, 10:40 PM: an OEM engineer has her drawing open, a pump housing with three bores toleranced to plus 0.0005 inch, beside three supplier tabs. Supplier 1's capabilities page shows a handshake photo and the words precision, tight tolerances, industry-leading quality. Read as a drawing, each adjective is a dimension with no value on the pump housing, and each is stamped no tolerance: reject. The title block's checked box is empty and the only action is contact us. Her drawing is uploaded to tab 2, Supplier 2, which states bores, first article and machine travel; Supplier 1 never learns it was in the running. Right, REV F released: the same page, same late night. Every callout carries a value: bore spacing 4.000 plus or minus 0.002, three bores 1.5000 plus 0.0005 held every day, horizontal machining center travel 40 by 32 by 34 inches, first-article report on every new part number, ductile iron and 316 stainless weekly. A drawing upload sits on the page and the title block is initialled checked. Whether she sends the drawing is still her call. Illustration; suppliers and specs invented. REV A · AS SAID 10:40 PM · TAB 1 OF 3 REV F · RELEASED SAME PAGE · SAME LATE NIGHT HER DRAWING · PH-2210 PUMP HOUSING · 3X BORE Ø1.5000 +.0005 -.0000 OPEN TABS · 10:40 PM TAB 1 · SUPPLIER 1 ADJECTIVES, PHOTO NOTHING TO CHECK TAB 2 · SUPPLIER 2 BORES · FAI · TRAVEL DRAWING UPLOADED TAB 3 · SUPPLIER 3 LINE CARD ONLY CLOSED UPLOADED TO TAB 2. SUPPLIER 1 NEVER LEARNS IT WAS IN THE RUNNING. SUPPLIER 1 SUPPLIER 2 SUPPLIER 3 brookfield-precision.test/capabilities BROOKFIELD PRECISION CAPABILITIES · ABOUT · CONTACT HANDSHAKE PHOTO PRECISION. TIGHT TOLERANCES. INDUSTRY-LEADING QUALITY. READ AS A DRAWING PRECISION NO TOLERANCE: REJECT Ø TIGHT TOLERANCES NO TOLERANCE: REJECT INDUSTRY-LEADING QUALITY NO TOLERANCE: REJECT CONTACT US DRN MARKETING CHK REV A HER DRAWING · PH-2210 PUMP HOUSING · 3X BORE Ø1.5000 +.0005 -.0000 OPEN TABS · 10:40 PM TAB 1 · SUPPLIER 1 EVERY CALLOUT TOLERANCED TAB 2 · SUPPLIER 2 BORES · FAI · TRAVEL DRAWING UPLOAD TAB 3 · SUPPLIER 3 LINE CARD ONLY CLOSED HER CALL STILL. NOW SHE HAS WHAT SHE NEEDS TO MAKE IT. SUPPLIER 1 SUPPLIER 2 SUPPLIER 3 brookfield-precision.test/capabilities BROOKFIELD PRECISION CAPABILITIES · ABOUT · CONTACT HMC ENVELOPE BORES HELD TO +.0005 HMC TRAVEL 40 X 32 X 34 IN FAI ON EVERY NEW PART DUCTILE IRON · 316 SS READ AS A DRAWING 4.000 ±.002 3X Ø1.5000 +.0005 -.0000 HELD EVERY DAY FAI REPORT · EVERY NEW P/N DUCTILE IRON · 316 SS · WEEKLY UPLOAD DRAWING DRN MARKETING CHECKED LT REV F ADJECTIVES WITH NO VALUES, EACH REJECTED. THE DRAWING GOES TO TAB 2. SAME PAGE, EVERY CALLOUT TOLERANCED. TITLE BLOCK INITIALLED CHECKED. GENERAL NOTES 1. ILLUSTRATION. THE ENGINEER, BOTH SUPPLIERS AND EVERY SPEC ARE INVENTED (.TEST). 2. EVERY CLAIM CARRIES A VALUE: TOLERANCE, ENVELOPE, METHOD, MATERIAL. NO OUTCOME IS CLAIMED. 3. THE PAID BLUEPRINT CAPTURES THE NUMBERS. THE WEBSITES BUILD PUTS EACH BESIDE ITS CLAIM. TITLE THE UNTOLERANCED DIMENSION ILLUSTRATION · INVENTED COMPANIES (.TEST) SHEET103 REVF SCALE NTS · DRN IM INDUSTRIAL MARKETING

The Untoleranced Dimension

Can an agency hold its own with your engineers?

Yes, if it learns the product the way a new hire on the floor does. We learn yours through the paid Buyers Blueprint: your documents, an on-site visit and short interviews with the engineers who run the work. Every technical page we write is checked and signed off by one of your engineers before it goes live.

In this guide

How engineers research suppliers

Engineers do most of their supplier research on their own, online, before they talk to anyone. In TREW Marketing and GlobalSpec's 2025 State of Marketing to Engineers report (March 2025), 73% of technical buyers said they rely on vendor websites and online technical publications, and about 60% of the buying process happens online before engineers engage with sales.

The research tends to run like this. A search for the process, the material or the part. Three or four supplier sites open side by side. A machine list, a datasheet or a cert page on each. Then a closer look at the one or two shops left: a capability page in their industry, a case study, the quality page. Only then a call, an email or a drawing upload.

So by the time an engineer calls, the shortlist is usually set. Your website decides whether you're on it, and it does that job while nobody from your company is in the room.

What they trust, and what they skip

Engineers trust what they can check. Each row sets a line an engineer can verify beside one they can't. Every spec comes from an invented supplier.

TrustedSkipped
Capability'Bores to ±0.0005 in on 4140, up to 24 in diameter''Tight tolerances'
Quality'AS9100D, first article per AS9102, CMM report with every lot''Industry-leading quality'
Finishing'Electroless nickel per AMS 2404, 0.0005 to 0.002 in''Full finishing services'
Testing'Salt spray to ASTM B117, 1,000 hours, report on request''Rigorously tested'
Materials'316L, 17-4 PH, Ti-6Al-4V and Inconel 718, with mill certs''A wide range of materials'
EquipmentA machine list with envelopes and spindle specs'State-of-the-art equipment'
Lead time'Prototypes in 10 working days, production in 4 to 6 weeks''Fast turnaround'
ProofA case study with the part, the problem and the numbers you can shareA handshake photo
Next stepAn RFQ form that takes a drawing, with an NDA option'Contact us for more info'

How to write for engineers

Write the way a good drawing is drawn: every feature dimensioned, every note specific, nothing decorative. Seven rules cover most of it.

  1. OP 10

    Put the number next to the claim

    Write the tolerance, the envelope, the volume or the turnaround in the same sentence as the claim. 'Tight tolerances' is a dimension with no value.

  2. OP 20

    Name the standard, and its scope

    AS9100D, ISO 13485, AWS D1.1, ASTM B117: say which site, process and part family each one covers. A row of logos can't say that.

  3. OP 30

    Say what you won't take

    Limits build trust. 'Up to 24 in diameter' and 'no castings over 2,000 lb' tell an engineer you know your floor.

  4. OP 40

    Answer first

    Open each page with the answer to the question that brought the engineer there. The history of the company can wait.

  5. OP 50

    Use the buyer's words

    Write the term the engineer searches: the process name, the material grade, the failure they need to stop. Your internal names come second.

  6. OP 60

    Write it as text

    Specs locked in a PDF or an image are hard to search and hard for AI assistants to read. Put them on the page as text and tables, and keep the PDF as a download.

  7. OP 70

    Let an engineer check it

    Before a page goes live, the person who runs the work reads it. If they wouldn't sign it, it doesn't ship.

What to put on your manufacturing website

Five kinds of page answer most of what an engineer checks before shortlisting a supplier.

  1. OP 10

    A page per capability, with its limits

    Envelope, materials, tolerances, volumes and secondary ops, one capability per page. Say what you won't take, too.

  2. OP 20

    Your standards and certs, each with its scope

    Which cert covers which site, process and part family, written out as text next to the logo.

  3. OP 30

    How you control risk

    First article, PPAP, validation or a phased build, written as steps, with what the customer gets at each one.

  4. OP 40

    Application pages for the industries you serve

    Medical, aerospace, defense, energy, food and beverage: same machines, different questions. Each page answers its industry's.

  5. OP 50

    An RFQ form that takes a drawing

    Engineers would rather upload than describe. Take the file types your buyers send, offer an NDA and say when they'll hear back.

A sample technical page

This is the top of a capability page written to these rules, for Kettle Brook Precision, the invented shop on our example Blueprint page. Every value is invented.

What the page says
Page titlePassivation of stainless steel parts to ASTM A967 and AMS 2700
Answer firstWe passivate 303, 304, 316L and 17-4 PH parts in house, up to 18 in long. Every lot ships with a certificate of conformance tied to its lot number.
LimitsNo parts over 18 in or 40 lb. Titanium goes to a qualified partner.
VerificationWater immersion or humidity test on each lot, as the drawing calls out
RecordsCertificate of conformance per lot, with bath records available to your supplier quality team
Written forThe supplier quality engineer, the design engineer and the buyer
Next stepUpload a drawing. NDA on request. Reply within one business day.

What changes by industry

The machines can be the same. The questions change with the buyer's industry, so each industry you serve gets its own page.

  • Medical device

    Validation (IQ, OQ, PQ), ISO 13485 scope, cleanroom class, material traceability and lot records.

  • Aerospace and defense

    AS9100 scope, first article to AS9102, special processes and who approves them, and how controlled drawings are handled.

  • Industrial equipment

    The failure the machine stops, the line speed, the footprint and the test on the buyer's own part.

  • Electronics and connectors

    Mating cycles, vibration, ingress rating and the test report behind each number.

  • Energy

    Pressure ratings, material certs to the code the project names, and how big a part you can handle and ship.

  • Labs and industrial services

    Accreditation scope, test methods, turnaround and how samples are handled and returned.

The rest of the buying group reads the same page

The engineer specifies. Others approve, order and run what you make, and they read the same page for different answers.

  • Design engineer

    Can you make it? Envelope, tolerances, materials and help with design for manufacturing.

  • Supplier quality

    Can I approve you? Certs and their scope, inspection, records and how you handle a nonconformance.

  • Buyer and procurement

    Can I order from you? Lead time, quote turnaround, registrations and who to call.

  • Plant or operations manager

    Will it run? Uptime, service, spares and who answers when a line is down.

When the engineer asks an AI assistant

Most engineers still don't use AI to choose a supplier. In the same TREW and GlobalSpec 2025 report, 70% said they rarely or never use AI to evaluate vendors, and they rated their trust in AI-generated content at 4.4 out of 10.

The ones who do ask get an answer built from what your pages say. If your site states the envelope, the standard and the limits as plain text, an AI assistant has facts to repeat. If it says 'precision' and 'quality', the assistant fills the gap with a guess, or names a competitor that wrote its numbers down.

So the work is the same for both readers. Write pages an engineer can check, and AI assistants can read them too.

Mistakes that cost you the shortlist

Each of these is common on manufacturing websites, and each gives an engineer a reason to close the tab.

  • Specs only in a PDF

    The engineer has to download it, and search engines and AI assistants read it poorly. Put the numbers on the page.

  • Basic specs behind a form

    Gate a long guide if you like. A form in front of an envelope or a cert sends the engineer to the next supplier.

  • Adjectives where numbers belong

    'State-of-the-art', 'tight', 'industry-leading'. Each one is an untoleranced dimension.

  • Cert logos with no scope

    A logo can't say which site or process the cert covers. Write it out.

  • A contact form with no upload

    'Contact us for more info' asks the engineer to describe a part they could have sent you in one file.

  • Stock photos

    A handshake or a generic machine proves nothing. Show your floor, your inspection room and, with permission, your parts.

Questions about marketing to engineers

How do engineers find suppliers?

Mostly on their own, online, before they contact anyone: search, supplier websites, technical publications and datasheets. In TREW Marketing and GlobalSpec's 2025 report, 73% of technical buyers said they rely on vendor websites and online technical publications.

What content do engineers trust most?

Content they can check: numbers, standards with their scope, machine lists, test methods and case studies that name the part and the problem. Adjectives and stock photos get skipped.

How technical should a manufacturing website be?

As technical as the drawings you quote from. Write the tolerance, the material, the standard and the envelope, in plain sentences the buyer and procurement can follow too.

Should we put our datasheets behind a form?

Keep the specs an engineer screens on open, as text on the page. A form in front of a basic spec gives the engineer a reason to try the next supplier.

Can an agency write technically enough for our engineers?

Only if it learns from them. We start with the paid Buyers Blueprint, visit your plant and interview the engineers who run the work, and one of them signs off every page before it goes live.

Do engineers still read newsletters?

Many do. In TREW Marketing and GlobalSpec's 2025 report, 91% of engineers said they subscribe to newsletters.

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