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When you’re buying micro magnets for production, “tiny” isn’t the hard part—repeatability is. Our micro neodymium magnets (NdFeB) and other neodymium micromagnets are built for designs where a few tenths of a millimeter changes fit, field, and yield—compact sensors, micro actuators, microrobotics, and lab-to-pilot builds. Share your drawing and stack-up, and we’ll help you lock OD/ID/thickness, coating build, and magnetization—then validate with samples before you commit to volume (often listed as a micron magnet or mikro magnet in EU docs).
(Note: For smallest neodymium magnets, feasibility depends on geometry, coating thickness, and handling yield. Send your drawing + quantity + coating requirement, and we’ll confirm manufacturability and a realistic tolerance window before sampling.)
Micro magnets are ultra-small permanent magnets where tolerance and coating build directly change fit and field, so they’re part of the functional spec—not a “nice-to-have.” For clarity, we use:
• Small magnets: 0.80–15.00 mm
• Micro magnets: 0.20–0.79 mm (200–790 μm)
In this range, most teams choose NdFeB for strength-to-volume, but your real limiter is usually handling yield + coating uniformity + air gap in the stack-up (often called a micron magnet in research notes, or mikro magnet in EU documentation).
Built for production: repeatable dimensions, coating control, and consistent magnetization for micro magnets and micro neodymium magnets
Common shapes: disc, block, cylinder, ring, tube, ball (custom micro forms available)
Grades: N35–N55, plus temperature grades on request when heat is a risk
Coatings: NiCuNi / Zn / Epoxy / Parylene options (coating build affects final OD/ID)
Packaging for assembly: trays, tape-and-reel, or custom fixtures for pick-and-place
Micro-part reality: brittle material—specify handling, cleanliness, and inspection needs early
Most RFQs for micro magnets use mm, while research notes may call them a micron magnet in μm. Either is fine—but always specify magnetization direction on the drawing. In micro assemblies, one wrong assumption (like treating the last dimension as the magnetization axis) can turn a “perfect sample” into a field-direction mismatch at build stage.
Osenc can produce micro magnets with the dimensions below as a custom magnet supplier.
If you’re working with ultra-thin parts (for example, 50 × 50 × 0.2 mm), we’ll confirm flatness, coating uniformity, and packaging to reduce cracking and chipping during transit.
For ring, tube, and hole-type micro magnets, concentricity control should be reviewed during the drawing stage. Even a small eccentricity between OD and ID may affect assembly fit, rotation balance, or signal stability in magnetic encoder and micro motor applications.
For encoder, rotor, and Hall effect sensor array projects, multi-pole magnetization may be available depending on magnet size, geometry, material grade, and fixture feasibility. Please share the pole count, magnetization pattern, mechanical datum, and sensor position so we can review whether the design is suitable before sampling.
Neodymium grades (N35–N55) describe material capability, but they don’t guarantee performance once your assembly adds coating, adhesive, housings, or any air gap. For micro neodymium magnets / neodymium micromagnets, volume is so small that many builds start at N52–N55 to keep usable field after losses. If heat is possible, prioritize a temperature grade first—because avoiding irreversible loss matters more than chasing the highest N-number.
NdFeB micro magnets are usually the first choice when the design requires high magnetic strength in a very small space. Their high BHmax, also called maximum energy product, helps provide stronger magnetic performance from a limited magnet volume, which is useful for compact sensors, micro motors, encoders, and precision assemblies.
| Material | Best For | Main Advantage | Key Limitation |
|---|---|---|---|
| NdFeB | Compact sensors, micro motors, encoders, precision assemblies | Highest magnetic strength in small volume | Usually requires coating for corrosion protection |
| SmCo | High-temperature sensors, aerospace assemblies, harsh environments | Better temperature stability and strong resistance to irreversible demagnetization | Higher material cost and more brittle handling |
| Ferrite | Cost-sensitive micro parts with moderate magnetic requirements | Good corrosion resistance and lower cost | Lower magnetic strength than NdFeB and SmCo |
| AlNiCo | Specific sensor or temperature-stable applications | Good temperature stability and stable magnetic behavior | Lower coercivity and less suitable for very small high-force designs |
SmCo micro magnets are better suited for high-temperature or harsh environments where magnetic stability matters more than maximum pull strength. Depending on the grade, SmCo can offer better operating temperature stability and stronger resistance to irreversible demagnetization than standard NdFeB magnets.
Ferrite and AlNiCo micro magnets may be considered when the application requires lower cost, better corrosion resistance, or specific temperature stability rather than the highest magnetic strength. If your design involves heat, a changing air gap, or long-term field stability, OSENC can review the material grade and demagnetization curve before sampling.
NdFeB micro magnets can corrode quickly in humidity or salt exposure, so coating should be treated as part of the spec—not an afterthought. Common options include Nickel, Zinc, epoxy, Parylene, selected based on corrosion risk and wear. For smallest neodymium magnets, coating thickness isn’t “free”: it changes effective OD/ID and can become a real air gap in your stack-up. If you’re tolerance-sensitive, confirm coating type, thickness target, and how thickness is measured before sampling.
For humidity, salt exposure, or long-term corrosion-sensitive applications, salt spray testing can be arranged to compare coating performance and confirm whether the selected coating is suitable for the working environment.
Micro magnets are used when reliable magnetic force is required in a very small mechanical space—for sensing, positioning, holding, triggering, or actuation. They are commonly used in electronics, medical devices, precision hardware, micro motors, sensor modules, and compact mechanical assemblies where every millimeter affects fit and performance.
In medical device and laboratory equipment manufacturing, micro magnets can be used in disposable surgical instruments, catheter tip assemblies, microfluidic diagnostic cartridges, compact actuation modules, and precision positioning components. For these applications, buyers often need more than magnetic strength. Coating stability, Parylene coating options, corrosion resistance, cleanliness, dimensional consistency, and packaging method can all affect the final assembly result.
For very small neodymium micro magnets, coating build and edge quality must be reviewed early because even a thin protective layer may change the final OD, ID, fit, or working gap. OSENC can support drawing review, coating selection, sample validation, and packaging recommendations before volume production.
In Hall effect sensor applications, micro magnets are usually selected based on surface gauss, magnetization direction, working distance, and the air gap between the magnet and the sensing element. These factors can affect switching distance, signal stability, and proximity detection accuracy.
For reed switch triggers, rotary position detection, magnetic encoders, and compact sensor modules, the magnet should be designed together with the sensor position, housing structure, and assembly tolerance. A small change in size, coating thickness, or magnetization axis may create a noticeable difference in sensor response.
Micro motors, magnetic encoders, and miniature actuator assemblies often require high magnetic flux density in a limited magnet volume. High-grade N52 to N55 neodymium micro magnets are commonly considered when the design needs stronger magnetic performance from a very small rotor or moving component.
In these applications, dimensional tolerance, magnetic consistency, magnetization direction, and assembly method are all critical. OSENC can review your drawing, rotor size, working gap, coating requirement, and target magnetic performance before sampling to help reduce trial-and-error during development.
Sensors & detection: Hall effect sensors, reed switches, proximity sensing, position detection, and signal triggering.
Micro motors & rotors: small BLDC motors, magnetic encoders, miniature rotors, and compact actuator assemblies.
Fastening & latching: tiny closures for cases, covers, doors, lids, and precision housings.
Alignment & positioning: jig fixtures, precision locating, repeatable docking, and assembly positioning.
Electronics & connectors: magnetic charging tips, pogo-pin alignment, cable ends, earbuds, headphones, and wearable devices.
Medical & lab devices: small instruments, disposable cartridges, microfluidic fixtures, and compact diagnostic assemblies.
Industrial fixtures: pick-and-place aids, small-part holding, and assembly support.
Modeling & prototyping: miniature parts, hobby builds, product testing, and early-stage prototype assemblies.
For custom micro magnet projects, OSENC can review your drawing, material requirement, coating, magnetization direction, working distance, and assembly stack-up before sampling. This helps confirm whether the proposed size, tolerance, coating build, and magnetic direction are realistic for production.
If the magnet is used for holding, latching, sensing, or a magnetic assembly, we can help evaluate key factors such as surface gauss, magnetic flux density, air gap influence, and possible pull force against the target part. For more complex assemblies, Finite Element Analysis (FEA) can be used to estimate field distribution and force behavior before tooling or sample production.
This early review helps reduce trial-and-error cost, avoid field-direction mismatch, and improve the chance that the first sample matches the final application requirement.
Micro magnets require more than standard visual inspection. Because the part size is extremely small, small variations in geometry, coating thickness, magnetization direction, or magnetic output can affect the final assembly result.
For dimensional control, OSENC can inspect OD, ID, thickness, hole size, and micro geometries using optical projector inspection, microscope measurement, and other precision inspection methods. This is especially important for ring magnets, tube magnets, blind-hole magnets, and ultra-thin parts where concentricity control and edge quality may affect assembly fit.
For magnetic performance control, surface gauss can be checked with a Gaussmeter according to the required measuring position and distance. For projects that require stronger batch consistency, magnetic moment or material-grade consistency can be reviewed with suitable magnetic testing methods such as Helmholtz coil testing or related magnetic measurement procedures.
For coating reliability, salt spray testing can be arranged for NiCuNi, zinc, epoxy, Parylene, or other corrosion-resistant coatings when the application requires humidity, salt exposure, or long-term environmental resistance. Inspection reports can include dimensional data, surface gauss readings, coating notes, and packaging confirmation before shipment.
To quote micro magnets accurately (and avoid spec mismatches), please send:
If you’re sourcing micro neodymium magnets for assembly, tell us your packaging preference (tray or tape-and-reel) and we’ll recommend the most stable option before you move into volume.
Micro magnets are ultra-small magnets—often under 4 mm (commonly 1–3 mm)—made for assemblies where tiny tolerances matter. Most micro magnets use Neodymium (NdFeB) for maximum strength in a small footprint, while Samarium Cobalt (SmCo) is chosen when higher temperature stability is needed.
Typical size range: 1–3 mm features; often custom micro parts
Common materials: NdFeB (strongest mini form), SmCo (better heat stability)
Where they’re used: electronics, sensors, medical devices, micro-actuators
With our experience, such strong mini magnets are use in medical products , aircraft instrument sensor, mechanical watches, and microrobotics.
In medicine, they enable targeted drug delivery and enhance surgical instruments for less invasive procedures.
In microrobotics, they function as actuators for precise movement and are integral to sensing and control systems, allowing accurate navigation and positioning.
Overall, micromagnets provide precision, control, and efficiency in these applications, leading to improved patient outcomes and new possibilities in both fields.
A small neodymium magnet can feel “surprisingly strong” because neodymium (NdFeB) packs a lot of magnetic energy into a tiny volume. In real use, strength depends on grade, size, shape, coating, air gap, and the steel surface. For example, a 2-gram (0.07 oz) magnet can sometimes lift far more than its own weight—under ideal, flat-to-flat contact conditions.
What affects pull the most: magnet grade (e.g., N35–N52), face area, thickness, and the air gap
Best-case vs real-world: paint, plating, curvature, and thin steel can reduce holding force fast
Why it’s popular: high pull-to-size ratio + good resistance to demagnetization for many applications
The main downside of a neodymium magnet is that it’s not “tough” material. NdFeB is brittle, can chip or crack, and it can corrode if the coating is damaged—especially in humid or salty environments. Standard grades also start to lose strength as temperature rises; many typical neodymium magnets are rated around 80°C (176°F) unless you choose high-temp grades.
If you’re shopping for the strongest small magnets, you’re typically looking at high-grade Neodymium (NdFeB)—especially N56 where available. At Osenc, N56 neodymium magnets are positioned as top-end options for maximum strength in a compact size, often with nickel-copper-nickel plating for corrosion resistance. If you need a broader mix of sizes, N52 is also a common “high power” choice in tiny formats (for example, 1/8" × 1/16" discs).
Generally speaking, mechanical watches are highly sensitive to magnetism. People have to avoid any magnetic interference with it. That is why people believed that mechanical watches do not contain magnets. However, there are exceptions.
Some mechanical watches, such as those powered by the ETA 2895-2 movement, they have two pieces very micro magnets. They are use for balance the second wheel. These magnets are carefully engineered with very low magnetic field strength to prevent the magnetization of other components, which could otherwise compromise the watch’s accuracy.
Parylene.
In lots of medica case, customers choose Parylene.
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