|Outer ØD [mm]||12|
|Max temp. [°C]||250|
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.
For complete information about Ferrite (aswell as the other magnet materials), see our Magnet facts page.