SPECIFICATIONSThese 90 degree arc magnets are 0.75 inch (19.05mm) long and 0.125 (3.2mm) thick. They are composed of grade 40 neodymium iron boron magnetic material and are plated in nickel-copper-nickel for a shiny corrosion resistant finish. Max Working Temperature - 176 F (80 C). Part Number NSN0628 Imperial Dimensions 0.75 inch outside radius x 0.625 inch inside radius x 90 deg x 0.75 inch long Metric Dimensions 19.05 mm outside radius x 15.875 mm inside radius x 90 deg x 19.05 mm long Material Sintered Neodymium-Iron-Boron (NdFeB) Shape Arc Plating Ni-Cu-Ni (Nickel) Magnetization Direction Diameter Grade N40 Pull Force (lbs[g]) [0] Surface Field(G) 4551 Maximum Operating Temperature 80 Deg C (176 Deg F) Dimensional Tolerance +/-0.005" Magnet Quantity 2 Volume (cm3) 0 Weight (g) 8 Brand Magcraft Packaging Magpak Tube UPC 875661000283 Remanent Flux Density Br (kG [T]) 12.5-12.8 [1.25-1.28] Coercivity HcB (kOe [kA/m]) >=11.3 [>=923] 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