{"id":3499,"date":"2026-10-14T11:13:57","date_gmt":"2026-10-14T03:13:57","guid":{"rendered":"http:\/\/www.ziubinski.com\/blog\/?p=3499"},"modified":"2026-10-14T11:13:57","modified_gmt":"2026-10-14T03:13:57","slug":"what-are-the-different-sizes-of-ring-magnets-458a-523ae9","status":"publish","type":"post","link":"http:\/\/www.ziubinski.com\/blog\/2026\/10\/14\/what-are-the-different-sizes-of-ring-magnets-458a-523ae9\/","title":{"rendered":"What are the different sizes of ring magnets?"},"content":{"rendered":"

Hey there, thanks for popping in! If you\u2019ve ever scrolled through ring magnet listings and thought \u201cwait, these things come in way<\/em> more sizes than just \u2018small\u2019 and \u2018large\u2019\u201d \u2014 you\u2019re not alone. As a ring magnet supplier, I deal with this question all the time, and honestly? Most folks are shocked by how many different sizes we actually keep on hand (and how those sizes are actually meant to fit specific<\/em> uses, not just be random numbers). Let me break this down like I\u2019m chatting with a fellow buyer at a trade show, no stuffy jargon or confusing bullet points. Ring Magnet<\/a><\/p>\n

<\/p>\n

First off, let\u2019s get one thing straight: when we talk about ring magnets, \u201csize\u201d isn\u2019t just the diameter you\u2019d measure with a ruler. Yeah, that\u2019s part of it \u2014 but we also care about the inner diameter (the hole in the middle), the thickness, and even<\/em> the grade (wait, no, grade is about strength, not size, but I\u2019ll circle back to how size and strength play together). Most of the time, when someone emails us asking \u201cwhat sizes do you have?\u201d they start with \u201cI need a ring for X project\u201d \u2014 so let\u2019s frame this around actual use cases, because that\u2019s how most buyers actually shop, right?<\/p>\n

Let\u2019s start with the tiny ones. We call these micro ring magnets, and they\u2019re so small you could fit 10 of them on a dime. I\u2019m talking outer diameter (OD) from like 1mm up to 5mm, inner diameter (ID) around 0.5mm to 3mm, thickness 0.5mm to 2mm. These aren\u2019t for big jobs \u2014 you\u2019ll find them in tiny electronics, like smart watch bands (the little clips that keep bands secure), hearing aids, or the tiny sensory switches in game controllers. We once had a customer who used these for a DIY jewelry project \u2014 they were making custom magnetic clasps for delicate necklaces, and they needed something so small you couldn\u2019t even feel the clasp. The key here? Micro rings don\u2019t pack much pull force (like, barely enough to hold a paperclip, let alone a keychain), but their size is the whole point. You can\u2019t have a big magnet for a tiny, sleek part \u2014 that\u2019d stick out like a sore thumb.<\/p>\n

Next up, the small ring magnets. These are the workhorses for hobbyists and small-scale manufacturers. OD here is 6mm to 20mm, ID is 3mm to 12mm, thickness 2mm to 5mm. This is the size most people picture when they first think \u201cring magnet\u201d \u2014 they\u2019re big enough to have some actual pull, but small enough to fit in most small devices. Common uses: fridge magnets (though wait, most fridge magnets are thin discs, but we do make a small ring version for people who want a sleek circular fridge magnet), magnetic key holders, craft projects (like interlocking paper crafts that need a subtle magnetic join), and small motor parts (like the tiny motors in portable fans). We\u2019ve had a lot of Etsy sellers reach out for these \u2014 they make custom magnetic bracelets or phone grips, and this size is perfect because it\u2019s not bulky, but it holds enough to keep a phone steady when you prop it up. Pro tip here: if you\u2019re using these for a phone grip, go for a thickness of at least 4mm \u2014 it\u2019ll have enough pull to not slip off your dashboard.<\/p>\n

Then we get to medium ring magnets. These are the ones that bridge the gap between tiny and heavy-duty, and they\u2019re super versatile. OD ranges here are 21mm to 50mm, ID is 10mm to 30mm, thickness 5mm to 10mm. This is the sweet spot for a lot of industrial and small business applications. Think: magnetic screen doors (they use a pair of medium rings to hold the door closed tightly but let you walk through without too much effort), drawer latches for tool chests, larger motor parts (like those in robot vacuum cleaners), and even some fitness equipment (the magnetic resistance bands use medium ring magnets to create the resistance when you pull the band). We also get a lot of makers building custom speaker components \u2014 the medium size fits nicely into the speaker frame, and the thickness gives enough magnetic field for clear sound. Another use: magnetic bottle openers \u2014 you see those big ones mounted on fridges? That\u2019s often a medium ring magnet, because it\u2019s strong enough to pull a bottle cap off, and the hole in the middle is perfect for mounting the opener screw.<\/p>\n

Now the big ones \u2014 large ring magnets. These are for when you need serious pull, not just a subtle hold. OD here starts at 51mm and goes all the way up to like 150mm (we have custom ones even bigger, but most standard large sizes top out around that), ID is 25mm to 80mm, thickness 10mm to 25mm. Wait, and these aren\u2019t just bigger in diameter \u2014 the thickness is a big deal here. A thin large magnet won\u2019t have as much pull as a thicker one, so if you\u2019re going for size, make sure you match the thickness to your load. Uses for large ring magnets: industrial conveyors (they use them to hold metal parts in place as they move along the line), heavy-duty door latches for loading docks, metal detectors (the circular sensor part is a large ring magnet, because it can cover a big area and detect metal better), and even some automotive parts (like holding the gas cap door closed, though that\u2019s getting less common with electronic latches). We once had a customer in the recycling industry use our large ring magnets to separate metal from plastic in shredded waste \u2014 the pull was strong enough to pull small metal bits out of a pile, and the hole in the middle let them mount it to a conveyor belt easily. That was a big order for us, and it\u2019s one of those jobs where size does<\/em> matter \u2014 you can\u2019t use a small magnet to cover that much area.<\/p>\n

Wait, but hold on \u2014 I should mention custom sizes, right? A lot of new buyers don\u2019t realize that most suppliers (including us) don\u2019t just stick to pre-made sizes. If none of the standard micro, small, medium, large fit your project, we can make a custom ring magnet to your exact specs \u2014 OD, ID, thickness, even the material (neodymium, ferrite, alnico, whatever you need). I\u2019ve had customers come to us with a sketch for a medical device, and the size was something like 7mm OD, 2mm ID, 1.5mm thickness \u2014 that\u2019s not a standard size, but we can make it no problem. The key there is to give us as much detail as you can: what the magnet is going to touch, how much weight it needs to hold, if it\u2019ll be exposed to heat or water (that affects material, too, not just size).<\/p>\n

Let me also clear up a common confusion: people mix up size with pull strength all the time. A big thin ring magnet might have less pull than a smaller thick one, because pull strength depends on volume (more magnet material = stronger pull, generally). So if you need a strong magnet, don\u2019t just go for the biggest OD \u2014 ask about thickness, or if we have a higher-grade material that fits your size needs. For example, a small neodymium ring (grade N52) might hold 10 pounds, while a medium ferrite ring might only hold 3 pounds, even though the ferrite is bigger. That\u2019s a big mistake a lot of first-time buyers make \u2014 they see a big size and assume it\u2019s strong, but that\u2019s not always the case.<\/p>\n

As a supplier, the thing I want people to know is that we don\u2019t just sell magnets \u2014 we help you pick the right size for your project. A lot of times, a customer will reach out saying \u201cI need a 30mm ring magnet\u201d but when we ask what they\u2019re using it for, they say \u201cholding a 5-pound metal sign to a metal wall\u201d \u2014 turns out a 40mm thick medium ring is better than a 30mm thin one, because it has enough pull to hold the sign without falling. We\u2019re here to walk through that with you, no pressure \u2014 no upselling a bigger size just because it\u2019s more expensive, just helping you get exactly what you need.<\/p>\n

If you\u2019re still not sure what size you need, here\u2019s a quick checklist to get you started:<\/p>\n

    \n
  1. How much space do you have for the magnet? Measure the area where it\u2019ll go \u2014 that\u2019s your OD max.<\/li>\n
  2. Do you need a hole in the middle? If yes, measure what the axle or screw size is that\u2019ll go through it \u2014 that\u2019s your ID.<\/li>\n
  3. How much weight does it need to hold (or what force does it need to resist)? That\u2019s key for strength, which ties into thickness and grade, not just size.<\/li>\n
  4. Any environmental factors? Heat, water, dust \u2014 that might mean adjusting size if you need a material that works better in those conditions, but we can work with that.<\/li>\n<\/ol>\n

    At the end of the day, ring magnet sizes are all about matching your specific need. There\u2019s no one-size-fits-all, but there\u2019s definitely a size for your<\/em> size. Whether you\u2019re a hobbyist making custom crafts, a small business owner building a new product, or an industrial buyer looking for parts for a production line, we\u2019ve got the standard sizes in stock, and we can make custom ones if you need something unique.<\/p>\n

    <\/p>\n

    If you\u2019re ready to chat about your project \u2014 whether you need help picking the right size, want a quote for bulk orders, or have a custom request \u2014 just reach out. We\u2019re here to answer any questions, no matter how small. Don\u2019t overcomplicate it \u2014 send us the details, and we\u2019ll point you in the right direction.<\/p>\n

    \n

    Neodymium Magnet<\/a> References:<\/p>\n

      \n
    1. Neodymium Magnet Manufacturers Association. (2022). Standard Sizing Guide for Ring Magnets. Retrieved from industry technical resources<\/li>\n
    2. Industrial Magnet Society. (2021). Practical Applications of Ring Magnets by Size Category. Annual Technical Report<\/li>\n
    3. Hobby Maker Supply Co. (2023). 2023 Guide to Small Magnets for DIY Projects. Makers\u2019 Resource Manual<\/li>\n<\/ol>\n
      \n

      Xiamen Zhaobao Magnet Co., Ltd.<\/a>
      With abundant experience, we are one of the most professional ring magnet manufacturers and suppliers in China. Please feel free to wholesale advanced ring magnet made in China here from our factory. All customized products are with high quality and competitive price.
      Address: Room 201, No.15, Longxinli, Siming District, Xiamen, Fujian, China
      E-mail: zb16@magnets-world.com
      WebSite:       https:\/\/www.zbmagnet-king.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

      Hey there, thanks for popping in! If you\u2019ve ever scrolled through ring magnet listings and thought … What are the different sizes of ring magnets?<\/span>Read more<\/a><\/p>\n","protected":false},"author":122,"featured_media":3499,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3462],"class_list":["post-3499","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-ring-magnet-46ca-5277fe"],"_links":{"self":[{"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/posts\/3499","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/users\/122"}],"replies":[{"embeddable":true,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/comments?post=3499"}],"version-history":[{"count":0,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/posts\/3499\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/posts\/3499"}],"wp:attachment":[{"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/media?parent=3499"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/categories?post=3499"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.ziubinski.com\/blog\/wp-json\/wp\/v2\/tags?post=3499"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}