|Outer ØD [mm]||7.5|
|Inner Ød [mm]||4.5|
|Max temp. [°C]||80|
|Remanence Br [kGauss]||12.1 - 12.3|
|Remanence Br [Tesla]||1.21 - 1.23|
|Coercivity HcB [kOe / kA/m]||11.0 / ≥875|
|Coercivity HcJ [kOe / kA/m]||12 / ≥955|
|Energy product (BH)max [kJ/m3 / MGOe]||280 - 298 / 35 - 37|
NPM stands for North Pole Marked.
This means that the side that is north has a marking, most commonly a dot or a line from a red marking pen.
If the manget is SPM, it means that the south side has a marking. Most often in the form of a dot or a line in blue.
A marking makes it easier for assembly jobs that require you to always mount the magenta in the same direction.
This could be if the magnet is to work against a sensor or if the magnet is to be mounted in a magnet system.
There are other ways to identify the north and south side of a magnet. This can be done with, for example, a pole-pen.
You can easily search for this tool or you can find it under Measure & demagnetizing equipment.
For complete information about Neodymium (aswell as the other magnet materials), see our Magnet facts page.
You have added Ring Neodymium N36 7,5x4,5x2mm Ni NPM Diametrically magnetized to your quotation request.