Super Strong Neodymium Disc Magnets

A super strong neodymium disc magnets for a reed switch is a plain sintered Neodymium (NdFeB) disc chosen for one job: to close or open a reed switch reliably across a set gap. The disc is the simplest shape a sensor can work with. It is the magnetism behind it that has to be specified, meaning strength, direction and the distance at which the switch actually sees it.

 

A reed switch responds to the field that reaches it, and that field depends on which way the disc is magnetised. The table below compares the charging directions we supply. Axial puts both poles on the flat faces and reads strongest when the switch sits face-on, which is the usual case for a door or a lid. Turn the poles to opposite sides of the rim instead, what we call diametrical charging, and a switch mounted in line with the disc's edge sees it better. Rotary and encoded positions want radial or multi-pole patterns, and those are made to order.

Where these discs go to work. A door or lid closes over the disc, the reed switch inside the frame clicks, and a panel learns the opening is shut, the same principle behind appliances, machine guards and alarm contacts. Meters and counters drop a disc on a wheel so each turn passes a switch once. Robotics teams tape a disc to a joint and a switch to the chassis to find the home position. The disc does not need to be large; it needs to be predictable at the gap the switch sits across.

Discs for switching are matched by test, not by datasheet alone. We charge axially as standard, through the thickness, and can supply a sample set so the gap can be measured with your own reed switch before an order is fixed. Coating is nickel-copper-nickel by default, and because nickel is thin here, epoxy is the choice where the disc is handled or damp. Tolerance on diameter and thickness holds to about ±0.1 mm once ground.

How to Specify

If a design needs neodymium disc magnets for reed switches, send the disc size, the gap the switch must bridge and the charging direction, and we will confirm grade, coating and strength before quoting. Odd sizes are ground to drawing.

 

 

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