30x10x5 mm Neodymium Ring Magnet
A 30x10x5 mm neodymium ring magnet is 30 mm outer diameter, 10 mm inner diameter and 5 mm high. It is a standard size in the Rami Technics stock list (code HAL1016) and is supplied in grades from N35 to N52, with HRE-free and Dy/Tb options, in nickel, epoxy or gold coating.
Specification
| Shape | Ring magnet (sintered NdFeB) |
|---|---|
| Nominal size | 30x10x5 mm |
| Magnetisation | Normally through the 5 mm height (axial); other directions on request |
| Volume | 3,142 mm³ (3.142 cm³) |
| Weight each | about 23.6 g (nominal size, density 7.5 g/cm³, before coating) |
| Pieces per kilogram | about 42 |
| Grades | N35-52 / HRE FREE / Dy&Tb |
| Coating | Nickel, Epoxy, Gold |
| Stock code | HAL1016 |
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. A ring also allows a screw or pin through the centre, and it is common in sensors, motors and couplings.
The shape sits between thin and tall. Its temperature margin is moderate, so state your highest working temperature when you ask for a quote.
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 30x10x5 mm ring magnet
How much does a 30x10x5 mm neodymium ring magnet weigh?
About 23.6 g each, or roughly 42 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 30x10x5 mm ring 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 ring 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.