Neodymium NdFeB Block Magnets
Where compact size and high strength are required
You may be more suited to see content specific to your location. Continue to our US site
Ideal where compact size with maximum strength is required
Overview - Neodymium NdFeB Disc Magnets
NdFeB or Rare Earth disc magnets are round coin-shaped Neodymium magnets of varying diameter and thickness. Generally the NdFeB disc magnets are axially magnetised i.e. one circular flat face is a North pole, the other circular flat face is a South pole with the distance between the flat faces (the disc thickness) being the distance between the poles (the magnet is magnetised along the central axis of the Neodymium disc magnet). All our NdFeB disc magnets are supplied as axially magnetised NdFeB magnets unless otherwise stated.
Diametrically magnetised Neodymium rare earth magnets are possible (i.e. the magnet is magnetised across the diameter perpendicular to the central axis - like being magnetised from 12 noon through to 6pm when looking down onto the magnet circular face). If you were to put a row of cans flat face down onto a table to form a single line of touching cans, this is how diametrically magnetised magnets would normally attract each other - point contact. We produce the majority of these as custom magnets.
The axially magnetised NdFeB rare earth disc magnets can be stacked in attraction to create thicker magnets (in multiples of the magnet thickness). Increasing the Neodymium disc magnet thickness can give an increase in magnetic output from the magnet but there is a thickness at which adding extra magnet height gives less and less performance benefit (the performance plateaus off) - if more performance is needed then a bigger diameter magnet should be considered (or ask us for advice).
So if you are not sure how thick your magnet should be then consider getting a thinner magnet and building up height by stacking until you empirically gain the performance you require. The Neodymium disc magnets can be fixed in place by using adhesives (e.g. superglue / cyanoacrylate, two part epoxies, etc). Holes can also be machined into parts for the magnets to be glued in place or inserted deeper and potted away to hide the magnet or give it extra corrosion protection. Sometimes the discs are covered to hide them e.g. in furniture making a thin wood layer is put over the magnet to hide it and improve the aesthetic appearance of higher value wooden furniture (bearing in mind that it introduces an air gap which will lower the magnetic pull force which can be gained by using thicker NdFeB magnets and/or bigger diameter NdFeB magnets). The Neodymium disc magnets give more pull force when attracting another magnet than when attracting a ferromagnetic (e.g. mild steel) part. We also supply Neodymium block magnets read more .
If more pull force is required you could either use thicker magnets (perhaps stack magnets if testing), use a bigger diameter magnet (particularly when there is a distance between the magnets), minimise any distance (usually an air gap) between attracting magnets (smaller gaps give much more performance), use a stronger magnet grade (e.g. N48 instead of N30), or use any combination of the above. In some applications, you may simply be able to double your performance by repeating your magnet system in another location (e.g. to hold a door closed, have a magnet system at the top corner and add another at the bottom corner, doubling the potential performance). Note that it typically takes 5 times less effort to slide magnets apart than to pull apart so applications where magnet pole faces can slide apart have less holding force (if possible turn them so that they pull directly away from each other to make the pull force stronger).
The Neodymium NdFeB disc magnets are, unless otherwise stated, nickel plated (usually a NiCuNi triple layer) - other platings are possible upon request. The Neodymium disc magnets are supplied either with a keeper or supplied in rows with a keeper at each end. If you are in any doubt about the choice of magnet, its size or need technical assistance, please contact us.
NdFeB discs can be used for simple holding applications jewelry clasps, door closures, arts and crafts, point of sale holding, notice boards, folder closures. They can also be used for more complex design applications such as audio equipment, motors and levitation equipment.
|Product Number||Diameter (mm)||Thickness* (mm)||Weight (g)||Pull Force (kg)||Units per pack|
"We were delighted with the service provided by Eclipse Magnetics; from the initial site survey through to delivery."
"I cannot begin to tell you how much it has helped our operation, the magnetic filtration unit has been a real problem solver it has surpassed all our expectations. Its cured a 30 year plague!"
"This technology is economical, reliable and efficient. I believe that magnetic filtration technology is the future."
"Magnetic filtration has dramatically cleaned up our fluids and improved the surface finish we can offer. It extracts around 50Kg per day of ferrous waste."
"We chose Eclipse Magnetics to supply our housed grid because they are a respected and well-established brand. They offered us a very competitive price, and the process of ordering and installation was straightforward and reliable."
“We are delighted with the Automag installation; it’s solved all the problems we were having previously with downtime and maintenance costs. The filter means that we are able to use recycled water, which is saving us £1000 per week!”
"Here at Qualflow, we base our business on a philosophy of make the product simple to use, reliable and cost-effective. Eclipse Magnetics’ neodymium magnets offer the strongest magnetic performance, and are nickel plated, making them a cost effective.."
"The Ultralift Plus magnetic lifter from Eclipse Magnetics is the perfect solution for the pick-up and transportation of the ultrasonic calibration blocks in our facility"
"The result is an aesthetically pleasing system, which is effective in trapping metal contaminants and is easy to clean..."