Magnet technical resources.

NdFeB is the common name for neodymium–iron–boron permanent magnet materials. Nd₂Fe₁₄B identifies the main magnetic phase; a finished magnet can contain other phases, additions or a binder.

The number in N35 or N52 refers to a magnetic material grade. It does not specify the pull force of a finished part, and the temperature suffix needs application context.

Br, HcB, HcJ and BHmax describe different points or features of a material’s magnetic behaviour. None of them alone is a finished magnet’s holding-force rating.

Sintered and bonded NdFeB are different material systems. Specify the forming route, magnetic powder, binder and orientation before comparing properties or geometry.

A temperature rating is a selection guideline for a material and its conditions. The usable limit belongs to the assembled magnetic circuit and its required performance.

Curie temperature marks the loss of ferromagnetic order. A magnet can already suffer an unacceptable or permanent performance loss well below that point.

Choose a coating for the environment and assembly, then specify how it will be evaluated. A shiny surface or a coating name alone does not establish corrosion life.

Strong magnets can move suddenly, trap fingers and break into sharp fragments. Plan the handling method before opening the package, and keep loose magnets away from children.

Define both the magnetic axis and the required pole location. “Round”, “ring” or “arc” names the geometry and leaves the magnetization direction unresolved.

Specify the finished part and the measurement method together. A dimensional tolerance, a grade certificate and a pull-force test answer different acceptance questions.

Pull force measures separation under a particular test setup. Your usable holding load also depends on the steel, gaps, direction of loading, retention and consequences of release.

For a first estimate, multiply the material volume by its density. Use the density of the actual magnet material, and keep solid-part mass separate from assembly and packaging weight.

“Stronger” needs a measurement and a task. A higher material grade, a higher field at one point and a greater holding force can describe different magnets.

NdFeB is attractive when the magnetic function must fit a small space. Ferrite can be a sensible choice when more volume is available and material cost or corrosion exposure matters.

Compare the field available at the operating point, especially when heat and opposing fields act together. SmCo’s temperature behaviour can outweigh NdFeB’s room-temperature energy advantage.

Alnico can combine substantial remanence with relatively low coercivity. That makes magnetic-circuit design central to a comparison with NdFeB.