TRYMAG Small Neodymium Magnets, 200Pcs Round Rare Earth Magnet 8x3mm

I picked up this 60-piece pack of TRYMAG Strong Rare Earth Magnets to use for latch mechanisms, modular component connectors, and removable panels on my 3D printing projects. Having previously tested various budget craft brands, I was specifically looking to see if these could maintain tight dimensional tolerances and a high-quality surface finish. They completely met my expectations. Why these magnets are a solid addition to a maker's hardware kit: Vibrant and Tough Nickel Coating: The triple-layer Ni+Cu+Ni coating on these discs is exceptionally clean and smooth. Budget magnets often arrive with minor chips or a flaky finish that compromises the surface contact, but these rolls are flawlessly plated, allowing mating 3D printed parts to sit completely flush against one another. Dependable Structural Pull: For their compact size, the magnetic force is highly impressive. They click together sharply and offer plenty of structural holding power to secure heavy printed enclosure doors, tool panels, or modular hobby displays without letting go under vibration. Uniform Sizing: I checked several of these randomly with a digital caliper, and they are highly uniform in both diameter and thickness. This consistency is absolutely critical when you are designing press-fit pockets in CAD, as a variance of even 0.1mm can result in cracked plastic layer lines or loose magnets that fall out. Makerspace & Engineering Tips: Perfect CAD Tolerances: When designing a socket or recess to hold these for a pure press-fit, aim to model your hole diameter roughly 0.1mm larger than the magnet's physical size. This provides just enough clearance to press them home securely using the flat side of a pair of pliers without splitting your printed walls. Securing with Adhesives: If your model has a bit of loose play, opt for a thick Cyanoacrylate (Super Glue) or a quick-cure 2-part epoxy. As a rule of thumb, avoid using a hot glue gun anywhere near neodymium material, as the high heat can instantly and permanently degrade the magnetic alignment fields. Check Your Polarization: Before permanently gluing matching pairs into your 3D assemblies, mark one side of the magnet stack with a marker. This ensures you don't accidentally embed a disc backward and end up with joints that actively repel each other. In the end, this TRYMAG set provides a fantastic balance of high-grade pull strength, dependable manufacturing tolerances, and pristine plating. They interact beautifully with rigid plastics and heat-set inserts, making them an excellent choice for any engineering or modeling workbench.

I bought these mainly for miniature and hobby work, and the 10x1mm size has been useful for larger parts where the tiny magnets I normally use just aren’t strong enough. They have a good amount of holding power for how thin they are, and I’ve used them for removable panels, bases, larger model parts, and a few storage/display ideas. Since they’re only 1mm thick, they’re pretty easy to hide inside a model without adding much bulk. The main thing to watch is that these are brittle like most neodymium magnets. If they snap together too hard, they can chip, and the larger diameter means you need to plan the recess carefully before drilling or cutting into a model. Polarity is another thing I always check before gluing them in. I’ve learned the hard way that it’s easy to install one backwards if you’re moving too fast. Overall, they’re strong, thin, and useful for larger miniature projects where a small 3mm magnet doesn’t have enough pull.

God price for the money, but keep in mind these are low "power" magnets.

I used these to glue on the back of ceramic tiles I made to turn them into magnets. These magnets are strong, but not too strong to where you struggle to pull them off, small in size, think the size of your pinky nail. Overall would order again.

How I arrived at my overall rating: *** (3.5 stars rounded to 4) Value **** (4 stars) Purchase price: $10.07 Was a good price compared to comparable magnets Quality/Durability **** (4 stars) Duration of use: They do scratch kinda easy, but I didn't break any of them. Make sure to SLIDE them apart to avoid breaking. Ease of Use/Assembly/Install: ** (2 stars) For my application, They just didn't work as I thought they would. I mounted them on wood to make a resin knife holder. Testing it on wood was fine, held up the knives. I then tested it with varying thickness of cardboard in front of it to see how thick of a resin I could pour over. Found the correct depth, then poured the resin over. Final product came out nice, but the magnetic strength just wasn't strong enough for my project. Ended up having to drill out holes and putting magnets on the surface and then sealing. Usefulness/Appearance/Fun Factor: **** (4 stars) They could be good for other projects, just didn't work for mine.

I love the size and quality of these magnets. I have purchased several other brands and these are by far superior to others! They have an amazing hold capacity! They came in a case for storage and in perfect condition. I definitely recommend these and will be reordering more as needed. It’s a great value for the price. Don’t waste your money on less expensive ones! 5 stars!

These magnets work very well for my crafting needs! Strong hold for being so small!

Relatively consistent at 8mm but the average I'm getting on the height is 2.7mm. These did not work for my 3d printed project. I embedded them into the lid lips of a box with .6mm above each magnet, totaling to 1.2mm total between the two magnets, and they are not holding well. I bought these to restock on magnets that I had from another assorted kit that I purchased and those worked really well opposed to these. If you're looking to make small / light fridge magnets, these are fine. Pass for functional projects.

They’re smaller than what I first thought but that’s good, I didn’t want them to be so big. They’re VERY magnetic, hard to pull the magnets apart so that shows how good they are.

ボドゲのコマ入れに使うには十分な性能。コスパもよい。なによりちゃんと届く。

Don't know what happened, but in the past the magnets were consistently 3mm, the last batches I received were a mix of 2.5mm and 3mm, as if one wouldn't notice the difference.

抜群に いいです。

They work