R834DIA - Neodymium Diametric Ring Magnet - 1/2" Dia x 3/16" ID x 1/4" Thi

• Dimensions: 1/2" od x 3/16" id x 1/4" thick
• Tolerances: ±0.004" x ±0.004" x ±0.004"
• Material: NdFeB, Grade N42
• Plating/Coating: Ni-Cu-Ni (Nickel)
• Magnetization Direction: Diametrical
• Weight: 0.183 oz. (5.19 g)
• Pull Force, Case 1: 4.11 lbs
• Pull Force, Case 2: 5.45 lbs
• Surface Field: 6282 Gauss
• Max Operating Temp: 176ºF (80ºC)
• Brmax: 13,200 Gauss
• BHmax: 42 MGOe

These rings are diametrically magnetized, which means they are magnetized perpendicular to the axis of the hole. The poles are located on opposite sides of the circular faces, which makes them attract side-to-side as seen in the bottom picture. They can be placed on a shaft to work with sensors or to generate electricity.