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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.

Located in Beijing, China, Atech (HTXD) is a professional magnetic material manufacturer, we provide countersunk rare earth magnets, neodymium bar magnets and etc. With 25 years of experience of working with our customers for satisfying magnetic solutions, we have developed unsurpassed corporate strengths in product design, quality control, and customer service.