Industrial companies often have the strongest business case and the weakest website. The products are genuinely good, the engineering is real, the customers are loyal. And the site produces almost nothing.
The reasons why industrial websites fail are consistent enough to list, and most of them are structural rather than aesthetic. Which is good news, because structure is cheaper to fix than taste.

They were built for people who already know you
Most industrial sites are designed to be shown, not found. Someone meets you at a trade show, takes a card, and looks you up afterwards. The site exists to confirm you are real.
That is a legitimate job, and a site doing only that will never generate an enquiry from a stranger. The buyer who has never heard of you is searching for a process, a material and a tolerance. If your site is organised around your company history rather than what you can make, you will not appear in that search and you would not convert it if you did.
The catalogue is a PDF
This one costs more enquiries than any other single decision.
A downloadable catalogue is invisible to search engines. Every product inside it is a page you do not have and a search result you can never appear in. It is also miserable to use on a phone, and technical buyers check things on phones more often than the industry assumes.
Worse, it forces a decision before any value has been given. Someone who is not yet sure you can help has to commit to a download, and most will not. Products and capabilities need to exist as pages that can be found, filtered and linked to. Keep the PDF as well if buyers want it, but not instead.
Capability is described, not specified
Look at almost any industrial homepage and you will find precision, quality, innovation and partnership. Now try to work out from those words whether the company can machine a particular alloy to a particular tolerance.
You cannot, and neither can a buyer. Adjectives are free, which is why every competitor uses the same ones and why none of them carry weight.
Numbers do the work instead. Size envelopes, tolerance ranges, materials handled, capacity, batch sizes, typical lead times. A buyer with a drawing in front of them is trying to match it against something concrete. Give them something to match against and you are on the shortlist; give them adjectives and they move on to the supplier who published a table.

The certifications are buried
For a large amount of industrial procurement, certification is a gate rather than a selling point. If the standard is required and it is not visible, the enquiry does not happen, and you never find out it nearly did.
Registrations, approvals, testing standards and quality accreditations should be findable within a few seconds, with the actual scope and reference numbers rather than a row of logos. Logos prove nothing; a certificate number can be checked.
Total silence on commercial terms
Nobody expects a public price list on custom work, and publishing one would often be misleading. But many industrial sites say nothing at all about minimum orders, typical volumes or indicative lead times.
The intention is to protect pricing flexibility. The effect is that unsuitable enquiries arrive and suitable ones leave. A buyer with a two-week deadline needs to know whether your typical lead time is four weeks. Telling them costs you an enquiry you were going to lose anyway and saves you the call.
The enquiry form is built for a marketing department
A technical buyer wants to send a drawing and a question. Instead they meet a form asking for company size, job title, industry sector and how they heard about you, with no file upload.
Every field you add costs enquiries. In industrial contexts, the ability to attach a drawing or a specification is worth more than every qualifying question combined, because the drawing answers most of them anyway.
This is one of the most common reasons industrial websites fail while looking perfectly professional. It is also the cheapest thing on this list to fix.

Everything lives on one services page
Industrial search terms are long, technical and low volume. That is an advantage, because they are far less contested than consumer terms and the intent behind them sits much closer to a purchase order.
But you can only capture them with pages that match them. One page covering every process, every material and every industry served will rank for none of them. A page per capability, per material and per sector served is what turns those narrow searches into enquiries. In industrial work the page structure is the search strategy, which is why it gets decided before any design happens.
Nobody has updated it since it launched
New machines, new certifications, new materials, new capacity. None of it on the site, because updating the site is nobody job and the last developer is unreachable.
A site the company cannot edit will drift further from reality every year until it actively misrepresents what the business can do. That is worse than being out of date; it is turning away work you could have taken.
What to fix first
In order of return, and none of these require a rebuild.
Add a file upload to the enquiry form. Publish your certifications with scope and reference numbers. Turn the top ten items in the PDF catalogue into real pages. Replace one adjective-heavy capability paragraph with a table of actual numbers. Then state a lead time range, even a wide one.
Most industrial sites improve measurably from that list alone. If you work through it and still see nothing, the problem is structural, and the general reasons a site gets traffic without enquiries apply here too. It is also worth checking your own site against the signs that point to a redesign rather than assuming one is needed.
For a longer view of how these sites should be structured, see manufacturing web design, or send the URL for an honest read on which of these is costing you most.

Pingback: Web Design Plus SEO: Why Buying Them Separately Costs More | Build to Growth