If you’re in the market for a finger magnet, this one is worth checking out and sporting an initial TiN coating under the bioresin. At just under half a millimeter shorter in height than the m0426a, it is the smallest option we currently offer with the highest rating available: n55. At 1600G it isn’t as strong as its bigger, n52 brother, which comes in at 2110G, but it certainly isn’t a slouch with nearly double the field strength to mass ratio.
interested in one of those small one for fingertip install.
can you walk us through the difference between the m0422a and the m0426a?
obviously teh size and material, but how does that impact strength and sensing/lifting?
How does the coating bellow the resin affect the magnet?
is the size before or after encapsulation? (I can make .stl if it helps)
The 4x2.2mm from the name is after encapsulation. The core sizes are listed on the product page. This one is 3x1.5mm.
In term of field strength? Measurements are taken from the strongest pole (there are small asymmetries from our process). On a disc that means the face on a cylinder we use the side close to the pole as this is the strongest practical point for most installs. Spheres are annoying to measure but it’s the same: find the strongest point.
Sensing performance is theoretically better in terms of sensitivity due to the higher field strength to mass ratio (it’s just undet 2x. The m0422a weighes in at a miniscule 0.07g vs 0.19g).
Actually it’s 3x1mm and the m0426 has a 3x2mm core.
The biggest difference is that the m0422a core is n55 rating vs the n52 rating of the m0426a. Testing field strength at the surface still shows the m0426a has more field strength due to the core being double the size / mass, but for sensing, measuring field strength at the surface of the encapsulation isn’t really a direct indicator of sensitivity. We’re still working out a good test protocol for this.
