Here is a fact that sounds made up but is not: a company that started in 1925 by selling a single lock nut to two railroads is now a $1.2 billion global manufacturer, still owned by the same family, still headquartered a short drive from where it began. The company is MacLean-Fogg, and if you have never heard of it, that is not a marketing failure. It is closer to a business model.
The founding story is almost aggressively unglamorous. John MacLean Sr. was a vice president and general manager at the Boss Nut Company - a good job - when he decided he would rather make his own thing. He teamed up with a partner named Jack Fogg, put both surnames over the door, and went looking for customers. He found two: the Santa Fe Railroad and the Milwaukee Railroad. The product was a locking fastener, the kind of part that keeps a bolt from rattling loose under a moving train. His grandson, Barry MacLean, later summarized the whole enterprise in eight words: "He wanted to build a business around making something."
That is the entire thesis, and it has survived a hundred years of American manufacturing largely intact.
The economics of being invisible
There is a certain kind of company that thrives precisely because nobody thinks about it. The lock nut is a good example of the genre. If you are a railroad, or later a carmaker, or a utility stringing power lines, you do not want to spend a single minute thinking about the fastener holding your equipment together. You want it to work, arrive on time, cost a fair price, and then disappear from your attention entirely. MacLean-Fogg built a century of revenue on being the answer to a question customers would rather not have to ask.
Read that founder's line again and notice what it does not contain. No talk of disruption, no vision of dominating a category, no promise to change the world. It is a supplier's creed - the worldview of someone whose success is defined entirely by whether the customer's machine keeps running. In an economy that increasingly prizes the intangible, there is something almost contrarian about a firm whose entire proposition is: we will physically make the thing, and it will be correct.
Reinvention, one decade at a time
The trap for a company like this is obvious. You get very good at making one thing - say, a railroad fastener - and then the world stops needing quite so many railroad fasteners, and you go the way of a thousand forgotten industrial suppliers. MacLean-Fogg's answer was to treat its core skill not as "lock nuts" but as "solving physical fastening and forming problems," and then to keep finding new problems.
So the railroad fastener became automotive fasteners. Fasteners became engineered components - precision-machined parts, cold-formed metal, linkage and suspension pieces for cars and heavy trucks. Then plastic injection molding. Then, more improbably, metal 3D printing: MacLean Additive now makes 3D-printed, conformally cooled tooling for die casting, which is roughly as far from a 1925 lock nut as it is possible to travel while still, technically, making metal parts for machines. And in 2024 the company bought Mallard Manufacturing, which makes gravity-flow warehouse racking - the sloped shelving that lets pallets roll forward on their own. A fastener company buying a racking company only looks strange until you remember the actual business is helping people who move heavy things.
Today those threads are organized into five business groups - Fastener Solutions, Engineered Solutions, Plastic Solutions, Additive Solutions, and Mallard Manufacturing - plus the affiliated MacLean Power Systems, which serves electric utilities and telecom. The brand names underneath are the stuff of trade shows rather than headlines: Decorex stainless steel wheel nuts, Securex fasteners, Whiz-Lock, the Threadstrong aftermarket platform, Metform's transmission gear blanks. None of them are famous. All of them are, somewhere, holding something together right now.
The hardest trick in family business
Starting a family company is not the impressive part. Handing it to the next generation without the whole thing coming apart is. MacLean-Fogg has now done this four times, which is rare enough to be genuinely notable. Barry MacLean joined in 1961 and became CEO in 1972, running the place for decades. His son Duncan - the founder's great-grandson - joined in 1996 as a manufacturing engineer, then worked through seven different business units, including four and a half years living in Germany, before becoming president in 2015 and CEO in 2017. The pattern is deliberate: you work the floor before you get the office.
That succession discipline is a large part of why the company can measure its lifespan in generations rather than quarters. There is no venture clock, no pressure to exit, no board demanding a liquidity event. The reported numbers - roughly $1.2 billion in revenue, about 2,500 employees, more than fifty facilities across North America, Europe and Asia - describe a company big enough to matter and private enough to think in decades. Some sources count the workforce closer to 3,500 across all affiliated operations, which is the kind of ambiguity you get when a company would genuinely rather be building parts than counting itself for a press release.
What you can actually do with it
For the vast majority of people, the honest answer to "what can I do with MacLean-Fogg" is: nothing directly, and you are already doing it. If you drive a car, some of its fasteners or a transmission gear blank may have started as raw metal in a MacLean-Fogg cold-forming press. If your lights are on, its insulators and pole-line hardware may be part of the reason. If you have ever watched pallets glide forward on sloped warehouse racking, that is the Mallard side of the house. The company sells almost entirely business-to-business, to engineers who spec parts by the thousand and care about tolerances rather than brands.
But there is a more interesting audience for whom MacLean-Fogg is directly useful. An OEM with a hard forming or fastening problem - a part that has to be light, strong, cheap, and produced at scale - can bring it here and get engineering, not just a catalog. The additive arm can print die-casting tooling with cooling channels that could not be machined the old way, which shortens cycle times for other manufacturers. The Threadstrong aftermarket platform puts engineered fasteners into the hands of distributors and repair channels. In each case the pitch is the same one John MacLean made in 1925, updated for the technology: bring us the problem, we will make the part, and it will be correct.
The acquisition logic
A useful way to understand MacLean-Fogg's second century is to look at how it grows. It is not primarily a serial acquirer chasing multiples; it buys capabilities that fit the physical-problem-solving thesis and then keeps them. Mallard, bought in 2024, extended the company from making the parts that hold machines together into making the systems that move goods around. Metform opened a machining plant in Savanna, Illinois specifically to produce gear blanks for eight- and nine-speed light-vehicle transmissions - a bet that the drivetrain is getting more complex, not less. Each move is legible if you accept that the company defines itself by a competence rather than a product line.
In January 2026 MacLean-Fogg did something modest and, for a company this reticent, almost celebratory: it publicized its 100th anniversary. The messaging was about entering a second century - more forming and fastening innovation, more modern equipment, more expansion into new industries. It was not a victory lap so much as a status update. The lock nut worked. The customer was served. And the family, a hundred years on, is still building a business around making something.