China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Miniature precision magnets are widely used in fields such as micro motors, magnetic encoders, medical devices, and precision electronics. Due to their small size, high precision requirements, and complex application environments, customers often raise a series of specialized questions during the selection and usage process. Below, Xiao Fu has compiled 10 of the most common customer inquiries and provided answers.
Q1. Is the magnetic force weaker when the size of a tiny magnet is smaller?
Generally speaking, yes, but not absolutely. Magnetic force depends not only on volume but also closely on magnetic material grades (such as N35, N52), magnetic circuit design, and air gap size. Under the same conditions, high-grade magnets can still deliver strong magnetic performance even in tiny sizes, but overall, due to physical constraints, magnetic flux output will significantly decrease.
Q2. What is the minimum achievable size?
It depends on the material; for example, sintered neodymium iron boron can typically achieve a diameter of φ0.5mm or even smaller.
Q3. What is the achievable precision for tolerance?
General accuracy: ±0.03 mm, Precision grade: ±0.01 mm (1 thou)
Q4. Why are tiny magnets prone to cracking?
The primary reason is that sintered NdFeB itself is a brittle material, combined with its small size and thin edges, resulting in poor impact resistance.
Q5. Can multi-pole magnetization be performed?
Yes, but it depends on the material. The process is relatively difficult because the smaller the pole pitch, the higher the requirements for the magnetization fixture.
Q6. What is the temperature resistance? Are they prone to demagnetization?
Micro magnets are more sensitive to temperature; even if the temperature does not exceed the rated limit, partial irreversible demagnetization may occur.
Q7. How to assemble small precision magnets?
Common assembly methods include: adhesive bonding (epoxy, UV adhesive), press-fitting (interference fit), and embedded injection molding.
Q8. What is the lead time for micro magnet prototypes?
Approximately 2–3 weeks; specifics will be confirmed after consultation with the magnet supplier.Q
Q9: Which plating should I choose?
It depends on the magnet material you select. For ferrite or samarium-cobalt magnets, plating is not necessary. For neodymium-iron-boron magnets, nickel plating is recommended; for harsher environments, black epoxy plating can be selected.5
Q10: How do I choose the right magnet material?
For high magnetic strength, choose neodymium-iron-boron. If you need high-temperature resistance and good corrosion resistance, consider samarium-cobalt or ferrite; samarium-cobalt offers slightly stronger magnetic properties..
The above is a summary of common questions from customers about small precision magnets. If you need to purchase such magnets, you can contact our company for pricing and customization.
Selection of precision small magnets;