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http://www.atechmagnet.com/magnetic-materials/countersunk-neodymium-magnets/

Countersunk Neodymium Magnets
MaterialSintered Neodymium Iron Boron
DimensionsRound / RectangularCustomized
Countersunk HoleM1 — M10
ToleranceStandard +/-0.05mm, Min.+/-0.01mm
Magnetization OrientationAxial / Through Thickness
Magnetic PropertiesGradeMax. Operating Temperatures
N35-N5280°C (176°F)
33M- 48M100°C (212°F)
33H-48H120°C (248°F)
30SH-45SH150°C (302°F)
30UH-40UH180°C (356°F)
28EH-38EH200°C (392°F)
28AH-35AH230°C (428°F)
Remanence(Br)11,300 Gauss — 14,800 Gauss
Coercive Force(Hcb)10,000 Oersted — 12,600 Oersted
Intrinsic Coercive Force(Hcb)11,000 Oersted — 36,000 Oersted
Magnetic Energy Product (BH)33M GOe — 53M GOe
Surface TreatmentNi-Cu-Ni, Nickel, Zn, Gold, Silver, Copper, Epoxy, Chemical, PTFE, Parylene, Everlube, Passivation and more.