Exterior Thread 

Neodymium Pot Magnets with external threading:

Theory: the powerful neodymium magnets are inserted in a steel container. The steel container increases the holding force of the magnet when it is in direct contact with a thick iron surface. If there is no direct contact with the opposite piece or if the iron sheet is thin, rough or painted, the load that can be applied to the magnet will be much lower.

How do you know the clamping force? the clamping force is always calculated perpendicular. If you want to know the lateral force, you simply have to take into account that less force is required. To hang anything on the wall, you will not have any problem, since the clamping force is lateral.

Are they oxidized? If they are oxidized, they are prepared to be used in dry places without humidity.