Female Thread Neodymium Pot Magnet - Diameter 42mm x 20mm L_60m It has a M6 thread

It has a M6 thread with an external boss of 11mm

so these Male threaded pot magnets are a simple solution for magnetically adhering heavy items to steel surfaces

For many students

like these ring magnets

Dimensions: 45mm (H) x 30mm (W) x 23mm (D)

Female Thread Neodymium Pot Magnet - Diameter 42mm x 20mm L_60m It has a M6 threadNeodymium Pot Magnet with Female Thread Description: This Rare Earth Female Threaded Magnet has a diameter of 42mm, a total height of 20mm, and a magnet housing thickness of 9mm. It has a 6mm female thread. This strong Neodymium Magnet has a pull force of 68 kilograms and a weight of 87 grams. It is identified by the AMF Magnetics part number AMFYPD42. Uses for our Neodymium Rare Earth Female Thread Holding Magnets: Our Rare Earth Holding Pot Magnets