NdFeB sphere magnets are precision-ground neodymium balls used in magnetic couplings, rotor positioning, closure mechanisms, educational kits and bobbly fridge magnets. Spheres are ground from sintered blanks to tight sphericity and can be diametrically or axially magnetized.
We supply sphere diameters from 1 mm up to 30 mm with sphericity and size tolerances suitable for assembly automation. Larger spheres are available on request.
Key Specifications
| Specification | Value |
|---|---|
| Grades | N35–N52 standard |
| Diameters | 1 mm – 30 mm (larger on request) |
| Sphericity | ±0.05 mm standard, ±0.02 mm precision |
| Magnetization | Diametrical or axial |
| Coatings | Ni-Cu-Ni standard, gold for decorative use |
| Applications | Magnetic couplings, closures, kits, floating displays |
All magnets are produced to order. Please provide grade, dimension (or drawing), magnetization direction, coating and quantity for quotation. Email sales@polemagnet.com or use the inquiry form — we reply within 24 hours.
FAQ
NdFeB Sphere & Ball Magnets — FAQ
What is the smallest sphere size you produce?
Standard production starts at 1 mm diameter. Sub-millimetre spheres can be developed for special projects.
Can spheres be magnetized diametrically?
Yes, diametrical magnetization is common for coupling applications. The pole orientation is marked or specified by drawing.
Do you provide free samples for testing?
Yes, sample orders are welcome. Send your drawing or specification together with the intended application so our engineers can recommend the correct grade, magnetization direction and coating before we prepare samples.
Can the factory produce to my drawing with special tolerances?
Yes. We machine, grind and inspect to customer drawing tolerances. For sintered NdFeB the standard machining tolerance is ±0.05 mm and can be tightened to ±0.02 mm with diamond grinding where the geometry allows.
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Need Custom Magnets for Your Project?
Send your drawing, grade, magnetization direction and quantity. Our engineers will reply with a quotation within 24 hours.