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http://www.atechmagnet.com/magnetic-assemblies/threaded-magnets.html

Threaded Rod Magnets

Magnetic solution
provider & manufacturing expert，
25 years of professional experience
Innovative solutions for sustainable developments toward a better world
Striving for excellence and continuous improvements to support your success

MaterialSintered Neodymium Iron Boron, Steel
DimensionsDiameterMin.10 mm—Max.136 mm
Pull Force5 lbs — 900 lbs
Magnetization OrientationAxial
Magnetic PropertiesGradeMax. Operating Temperatures
N35-N5280°C  (176°F)
Remanence(Br)11,300 Gauss —  14,800 Gauss
Coercive Force(Hcb)10,000 Oersted — 11,600 Oersted
Intrinsic Coercive Force(Hcb)11,000 Oersted — 12,000 Oersted
Magnetic Energy Product (BH)33M GOe — 53M GOe
Surface TreatmentNi-Cu-Ni, Nickel, Zn