NSN0579
40-Count

Rare Earth Magnet - Disc, 0.25 in. Diameter x 0.125 in. Thick,

Rare earth magnets are the strongest type of permanent magnet
currently made. They are amazingly powerful for their size and
have innumerable uses. These disc magnets are 0.250 inch (6.4mm)
diameter and 0.125 inch (3.2mm) thick. They are magnetized
through the thickness. They are composed of grade 40 neodymium
iron boron magnetic material and are plated in
nickel-copper-nickel for a shiny corrosion resistant finish.
Maximum working temperature is 176 F (80 C).

Part Number NSN0579
Imperial Dimensions 0.25 inch diameter x 0.125 inch thick
Metric Dimensions 6.35mm diameter x 3.175mm thick
Material Sintered Neodymium-Iron-Boron (NdFeB)
Shape Disc
Plating Ni-Cu-Ni (Nickel)
Magnetization Direction Thickness
Grade N40
Pull Force (lbs[g]) 2.67[1211]
Surface Field(G) 3908
Maximum Operating Temperature 80 Deg C (176 Deg F)
Dimensional Tolerance +/-0.005"
Magnet Quantity 40
Volume (cm3) 0.1
Weight (g) 0.75
Brand Magcraft
Packaging Magpak Tube
UPC 897970000792
Remanent Flux Density Br (kG [T]) 12.5-12.8 [1.25-1.28]
Coercivity HcB (kOe [kA/m]) >=10.9 [>=867]
Intrinsic Coercivity HcJ (kOe [kA/m]) >=12.0 [>=995]
Maximum Energy Product Bhmax (MGOe [kJ/m3]) 38-41 [302-326]
Density p(g/cm3) >=7.45
Compression Strength (Mpa) 600-1200
Bending Strength (Mpa) 150-380
Vickers Hardness (HV) 460-660
Recoil Permeability (urec) 1.05
Electrical Resistance (Ohm*mm2/m) 1.25-1.55
Curie Temperature Tc (°C) 310
Thermal Expansion Coefficient 100°C//(x10^-6/K) 6
Thermal Expansion Coefficient 100°C?(x10^-6/K) -1