These are small rare earth magnets - 3/16" rings. Composed of Neodymium/Iron/Boron (NdFeB), these magnets are curiously strong and make for a great way to attach tools to a metal workbench, hold small children to a fridge, and as a trigger for reed switches. This one small ring can easily hold a piece of paper to your fridge.

We found these small rings to be very useful for connecting PCBs together. These rings are conductive and can act as a magnetic connector between widgets. You need a way to secure the ring to the PCB (screws and rivets have been shown to work).

Sold in single units.

Features:

• Dimensions: 3/16" od x 1/16" id x 1/16" thick
• Tolerances: ±0.002" x ±0.002" x ±0.002"
• Material: NdFeB, Grade N42
• Plating/Coating: Ni-Cu-Ni (Nickel)
• Magnetization Direction: Axial (Poles on Flat Ends)
• Weight: 0.00665 oz. (0.189 g)
• Pull Force: 1.48 lbs!
• Surface Field: 2275 Gauss
• Brmax: 13,200 Gauss
• BHmax: 42 MGOe