N35, N42 and N52 identify neodymium material grades. They help compare magnetic material, but do not provide a universal holding force for a finished assembly.
What the grade describes
The N number relates to the material’s maximum energy product. A higher number can provide greater magnetic output when comparing otherwise similar magnets. It does not mean that an N52 magnet of any size will hold more than every N35 or N42 magnet.
Compare like for like
Use the same shape, dimensions and magnetisation direction when comparing grades. Then consider the mating material, steel thickness, contact area and gap in the real assembly. A grade change is only one design option: changing the geometry or contact arrangement can also change performance.
Check temperature separately
The grade number alone does not specify the suitability of the magnet at your operating temperature. Temperature capability depends on the full material designation and application. Read the product’s stated temperature specification and ask for confirmation where your design runs close to a limit.
Build a practical shortlist
- Start with the space available and required dimensions.
- Check the material grade, coating and pole orientation.
- Describe the mating surface and gap.
- Test candidate parts in a representative assembly.
Compare our N35, N42 and N52 collections. For a custom specification, use the custom magnet calculator. Read the magnet strength guide before treating a catalogue pull figure as a working load.
Technical reference: FIRST4MAGNETS guide to neodymium grades.