25x5 mm Neodymium Disc Magnet
A 25x5 mm neodymium disc magnet is 25 mm diameter and 5 mm thick. It is a standard size in the Rami Technics stock list (code YUV1055) and is supplied in grades from N35 to N52, with HRE-free and Dy/Tb options, in nickel, epoxy or gold coating.
Specification
| Shape | Disc magnet (sintered NdFeB) |
|---|---|
| Nominal size | 25x5 mm |
| Magnetisation | Normally through the 5 mm thickness (axial); other directions on request |
| Volume | 2,454 mm³ (2.454 cm³) |
| Weight each | about 18.4 g (nominal size, density 7.5 g/cm³, before coating) |
| Pieces per kilogram | about 54 |
| Grades | N35-52 / HRE FREE / Dy&Tb |
| Coating | Nickel, Epoxy, Gold |
| Stock code | YUV1055 |
Where this size is used
A size like this is a typical holding magnet for fixtures, signs, tool holders, closures and light assemblies. Neodymium magnets of this size can pinch skin and snap together, so handle with care.
This is a thin, flat shape. Its working point is low, so it loses margin faster at higher temperature than a thicker piece of the same grade. For anything warm, choose a grade with a suffix (M, H, SH, UH) and check the Temperature Selector.
Choosing the grade and coating
Start from the working temperature and the environment, not from the highest N number. Standard grades are for ordinary indoor temperatures; the letters after the number (M, H, SH, UH) raise the temperature limit. Nickel is the usual coating for dry indoor use; epoxy is the usual choice for humidity, and gold is used for appearance and some medical or electronic parts. See the Selection Guide and the Coatings guide for details.
Questions about the 25x5 mm disc magnet
How much does a 25x5 mm neodymium disc magnet weigh?
About 18.4 g each, or roughly 54 pieces per kilogram. This is calculated from the nominal size and a density of 7.5 g/cm³, the same value as the Rami Technics weight calculator, before coating.
Which grade should I choose for a 25x5 mm disc magnet?
Grades N35 to N52 are available, with HRE-free and Dy/Tb options. Choose by working temperature first, then by the force you need. If the part gets warm, ask for a suffix grade (M, H, SH or UH). Tell us the temperature and the application and we will suggest one.
Can I order this size with a different grade, coating or tolerance?
Yes. Rami Technics supplies custom sizes and OEM programmes as well as stock sizes. Send the drawing or the dimensions, the grade, the coating, the magnetisation direction and the quantity, and we reply with a quote.
Other disc magnet sizes
Important notice: sizes are nominal, and weights are calculated from them with a density of 7.5 g/cm³ before coating, so real pieces differ slightly. This page is general technical information, not a specification, an offer or a guarantee of performance. Confirm the grade, tolerance and force against the datasheet and test a sample in your application.