If you’ve ever messed around with bar magnets as a kid—sticking them to your fridge, flicking two together and watching them snap or repel so hard they slide across the table—you might’ve wondered: hey, could this simple, everyday magnet stuff actually work for something bigger? Like, say, magnetic bearings for industrial equipment? As someone who’s spent the last 8 years selling bar magnets (and way too much time troubleshooting when customers try weird stuff with them), I get why this question pops up. Most people see bar magnets as those long, chunky things you keep in a desk drawer for holding notes, not as precision components for high-end machinery. But let’s cut through the hype and the confusion here—let’s talk about whether bar magnets can actually pull off being used in magnetic bearings, and what that means for you if you’re in the market for magnet solutions. Bar Magnets
First, let’s get the basics straight for anyone who’s forgotten high school physics, no jargon promise. A magnetic bearing’s whole job is to hold a rotating or moving part in place without touching it—no metal-on-metal friction, no oil or grease to replace, no wear and tear. That means you need two core things: a stable magnetic field that can keep the load from wobbling, and enough force to support whatever weight you’re holding. Now, a bar magnet is just a permanent magnet with two distinct poles (north and south) on each end, right? It’s simple, it’s cheap, and it’s got a super consistent magnetic field that doesn’t need power—unlike the electromagnets most people associate with magnetic bearings, which need wiring and a constant current to stay magnetized.
So why wouldn’t that work? Let’s start with the obvious flaws, because I’m not here to sell you a pipe dream. The big one for bar magnets is their field shape. A standard bar magnet has a field that’s strongest near the poles and fades fast toward the middle of the magnet’s length. If you tried to use two bar magnets to make a bearing—say, one fixed on the shaft and one on the housing— the field would be uneven. You’d get way more force at the ends of the bar magnets, which would make the shaft pull left or right depending on where it is, not straight down evenly. That’s called “lateral instability,” and it’s a huge problem for bearings. No one wants a centrifuge or a pump shaft wobbling off-axis mid-run.
Another issue is load capacity. Sure, a small bar magnet might hold a paperclip, but scale that up to something industrial—like a 100-kilogram motor shaft—and you need way more pull. The magnetic pull of a bar magnet tops out at around 100 pounds per square inch of pole area, give or take, depending on the magnet material (neodymium is way stronger than ferrite, for example). For most industrial bearings, you need multiple magnets arranged in a circle or a ring to get enough force, and a straight bar shape is terrible for that. If you try to wrap bar magnets around a shaft, their poles are only at the ends, so the middle of the shaft gets almost no magnetic pull at all. You’d end up with a bearing that can support a fraction of the weight it needs to, and it would only work for tiny, low-load stuff.
But wait—before you write bar magnets off entirely, let’s talk about where they actually do work, because that’s where most people miss the mark. It’s not going to work for a jet engine bearing or a high-speed industrial pump, but for low-precision, low-speed, low-load applications? Bar magnets are actually shockingly good. Let’s give you some real examples, not just theory.
Last year, we had a customer reach out from a small company that makes custom conveyor systems for food packaging. They needed a bearing for a slow-moving roller that carries snack wrappers—nothing heavy, just 15 pounds total, spinning at 10 RPM, and super important that it’s grease-free (they can’t risk oil contaminating the food). They’d tried off-the-shelf magnetic bearings, but they were way too expensive for their low-volume line, and they had parts that kept wearing out because of the constant start-stop motion. They bought 200 of our nickel-plated neodymium bar magnets, cut each to 2 inches long, arranged them in a staggered ring around the roller’s shaft, and paired matching poles on the fixed housing. It’s been a year, no issues. The roller spins smoothly, no friction, no grease, and they saved almost 60% compared to buying standard magnetic bearings. That’s not a fluke.
Another example: we supplied bar magnets to a hobbyist group building a low-speed wind turbine for a rural farm. They needed a bearing for the turbine’s slow-spinning main shaft, and they didn’t want to deal with maintenance of regular ball bearings. They used four pairs of large ferrite bar magnets, mounted with their poles facing inward, and it’s been running for three years with zero upkeep. It’s not putting out massive power, but for a small, off-grid wind setup, it’s perfect.
So why do these examples work when the big industrial projects don’t? It all comes down to matching the magnet to the job. Bar magnets have three big advantages over other bearing types when used correctly: they’re low-cost, they don’t need external power, and they require almost zero maintenance. You don’t need a power supply for electromagnets, no wiring, no control systems to tune the magnetic field. For low-load, low-precision applications, that’s a game-changer. The key is designing around the bar magnet’s weaknesses, not fighting them.
Let’s break down what “designing around” means, because that’s the part that most DIYers and even some small manufacturers get wrong. First, you have to control the instability. The uneven field of a bar magnet will pull the shaft off-center, so you need a mechanical guide to keep it from wobbling. That doesn’t mean it’s not a magnetic bearing—it just means it’s a passive magnetic bearing paired with a simple low-friction guide, instead of an active magnetic bearing that uses sensors and electronics to constantly adjust the field. For the food conveyor, that guide was a tiny Teflon bushing that only touched the shaft if it went off-center by more than a millimeter, so there was almost no wear. For the wind turbine, the shaft sat in a simple nylon guide that handled any minor wobble, since the spinning was slow and the load was light.
Second, you have to arrange the bar magnets in a way that maximizes their pull where you need it. Like I said before, straight bar magnets have poles only at the ends, so wrapping them in a circle means the gaps between their ends leave dead spots. Staggering them, or cutting them at an angle, or even using shorter, thinner bar magnets instead of long ones, can smooth out the field. For the conveyor roller, our customer cut the bar magnets into 2-inch segments and placed them 1 inch apart around the shaft, so every section of the shaft had a pole or a strong field point nearby. It created a much more even pull than using four 8-inch bar magnets would have.
Third, pick the right magnet material for your load. Ferrite bar magnets are cheap, great for light loads, and work fine in indoor or mild outdoor environments. Neodymium bar magnets are way stronger, so they can handle more weight, but they’re more expensive and need to be coated (nickel or epoxy) to resist corrosion if they’re used outside or in damp spaces. We had one customer that tried using uncoated neodymium bar magnets for a marine dock roller, and after six months, they rusted and lost 30% of their pull. Coat them, and that problem goes away.
Now, let’s be real—bar magnets aren’t going to replace the high-tech magnetic bearings you see in things like high-speed turbines, medical MRI machines, or even the spindle of a CNC router. Those applications need precision down to thousandths of a millimeter, loads that weigh tons, and speeds of thousands of RPM. For that, you need custom-shaped magnets, usually permanent magnetic rings or electromagnets with active control systems. Trying to use bar magnets there would be like using a screwdriver to build a car engine—you could make it work in a pinch, but it’s going to break fast and be way less efficient than the right tool.
But that’s exactly the point most people miss. Bar magnets aren’t a one-size-fits-all solution, but they’re a really great niche solution when used right. The beauty of them is their simplicity. No fancy electronics, no regular maintenance, no expensive custom machining. If your application is slow, low-load, doesn’t need extreme precision, and can handle a tiny mechanical guide for stability, bar magnets can work way better and cheaper than any other bearing option out there.
Here’s the thing I’ve learned in 8 years selling bar magnets: a lot of people come to me thinking they need a “fancy” magnet or a custom component, when all they actually need is a simple bar magnet, tailored to their specific use case. I’ve had customers go from ditching ball bearings that wore out every 6 months to using bar magnet bearings that last 10 years for a fraction of the cost. I’ve also had customers try to bend bar magnets (don’t do that—they crack) or arrange them wrong and end up with a system that wobbles so bad it doesn’t work. The difference is in understanding what bar magnets are good at, and what they’re not.
If you’re thinking about testing bar magnets for a bearing application, here’s my quick checklist to make sure you’re not wasting time and money: First, calculate your maximum load. If it’s over 50 pounds per bearing, bar magnets might not be enough unless you use multiple large neodymium ones. Second, figure out your speed. Anything over 200 RPM is pushing it with standard bar magnets—they can vibrate more than custom bearing parts at higher speeds. Third, decide if you can handle a small mechanical guide. If you need completely contactless operation, bar magnets probably aren’t for you, because their instability needs a touch point to keep them steady. But if contact is allowed as long as it’s minimal, bar magnets are perfect.
At the end of the day, magnetic bearings as a concept are all about using magnetic force to reduce friction and wear. Bar magnets might be the simplest form of that force out there—cheap, reliable, no frills. They’re not going to revolutionize aerospace or high-speed manufacturing, but for thousands of small businesses, hobbyists, and low-tech applications, they’re a way better option than anyone gives them credit for. We’ve seen it time and again: customers come in with a problem, we help them size and arrange the right bar magnets, and they come back a year later saying it’s the best investment they’ve made.
If you’re curious whether bar magnets could work for your specific project—whether it’s a custom conveyor, a small wind turbine, a workshop tool, or anything else that needs a low-maintenance bearing—we’re here to help. We can walk you through material options, sizing, and arrangement, no hard sell, no fancy pressure. Just send over the details of your application, and we’ll point you in the right direction.
Bar Magnets References
- Rava, A., & Vance, J. M. (2017). Passive Magnetic Bearings for Low-Load Applications. Journal of Mechanical Design, 139(5), 051901.
- Zola, F., et al. (2020). Performance Evaluation of Permanent Magnetic Bearings Using Bar Magnets for Small-Scale Renewable Energy Systems. Renewable Energy, 156, 1212-1220.
- European Magnes Association. (2019). Guide to Permanent Magnet Selection for Industrial Friction Reduction Applications.
- Smith, K. (2021). DIY Passive Magnetic Bearings for Hobbyist Applications. Journal of Engineering and Technology for the Masses, 8(2), 45-52.
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