Block Neodymium N42 Rare Earth Magnets – 50x10x2mm, 4pcs/pack
Long rectangle neodymium magnets N42, a.k.a. rare earth magnets are good for projects where magnetic holding force are needed in long, narrow spaces.
Although all neodymium magnets share the same characteristic of strong magnetic attraction force and brittle nature, which sometimes causes them to break on high impact collision with another magnet or even metal objects, some shapes and sizes are more prone to breakage than others. This particularly long and and slim shaped rectangle rare earth magnet at N42 grade is among the type that breaks quite easily. The 2 oblivious reasons that causes this magnet to break on collision is it’s length with a narrow profile and it’s relatively higher grade of N42, The force of impact in a collision will be greater due to the higher strength.
Now that we’ve highlighted the “weakness” of such long magnet, do take care when separating or handling it by always holding each pieces firmly such that the separated piece does not accidentally slip from your hands and “jump” back to collide with the remaining stack of magnets. (scroll down to see a photo of a pair of shattered neodymium magnets at the end of this page)
Broken/shattered neodymium magnets have sharp edges, be careful when handling the broken pieces.
The magnet tendency to break is greatly reduced once the magnet is install/secured/glued to a base or better still, covered with duct tape/fabric/thin cardboard etc as these soften any impact by reducing/absorbing some of the forces of impact. A stiff backing of wood or metal also add structural support to the magnet slim profile and reduces the potential of breakage due to accidental bending.
Attaching a piece of ferrous metal to any magnet increases the magnetic field/strength on the opposite side of the magnet as the ferrous metal will deflect the magnetic field on it’s side and focus it to the other side. An example: If you attached a sheet of ferrous metal to the north pole of a magnet, the strength of it’s south pole will be increased.
A simple experiment you can try:
Hold a piece of magnet and try to lift a metal object that is slightly too heavy for the magnet to pick up.
Next, attach the same magnet to a thick piece of ferrous metal and try lifting the same object again.
1 Pack contains 4 pieces of block magnets.
Size: 50 x 10 x 2mm
Magnetisation: Thru 2mm thickness
Max. Operating Temperature: 80 ° C
Tolerance: ± 0.1 mm