All flat ring magnets and block magnets with countersunk holes can be fastened with countersunk head screw, and given the name of screw-on magnets or screw-in magnets.Due to strong adhesive force, neodymium screw-on magnets are widely used in kitchen installations, booth construction, and shopfitting, signage technology, furniture construction, etc. Neodymium&ferrite pot magnets with counterbore and pot magnets with cylindrical borehole are also perfect for screw-fastening
To make them used longer, protection coating needed for the surface of rare earth neodymium(NdFeB) screw-on magnet, Zinc plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper nickel, environmental protection nickel copper nickel,epoxy coating are usually adopted. Rubber or plastic coated neodymium screw-on magnets can be supplied by Meank.
Surface | Coating | Thickness (Microns) | Color | Resistance |
Passivation | 1 | Silver Grey | Temporary Protection | |
Nickel | Ni+Ni | 10-20 | Bright Silver | Excellent Against Humidity |
Ni+Cu+Ni | Good Against Salt Spray | |||
Zinc | Zn | 8-20 | Bright Blue | Excellent Against Salt Spray |
C-Zn | Shinny Color | Superior Against Humidity | ||
Tin | Ni+Cu+Sn | 15-20 | Silver | Superior Against Humidity |
Silver | Ni+Cu+Ag | 10-20 | Silver | Superior Against Humidity |
Gold | Ni+Cu+Au | 10-20 | Gold | Temporary Protection |
Copper | Ni+Cu | 10-20 | Gold | Excellent Against Humidity&Salt Spray |
Epoxy | Epoxy | 15-25 | Black,Red,Grey | Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved |
Ni+Cu+Epoxy | Excellent Against Humidity | |||
Zn+Epoxy | Resistance | |||
Parylene | Parylene | 5-20 | Grey | Excellent Against Humidity |
Chemical | Ni | 10-20 | Silver Grey | Excellent Against Humidity |
Screw-on magnets are usually axially magnetized.That’s to say the poles are located above and below on the circular surface.Please tell us which side is N-pole or S-pole when order screw-on magnets
Custom screw-on neodymium(NdFeB) magnet
Screw-on neodymium magnets are widely used magnetic holder in daily life,some size can be used almost everywhere.We can make all types of custom neodymium screw-on magnets,which including rectangular screw-on neodymium magnet blocks,screw-on magnetic disc, waterproof screw-on magnets with plastic or rubber coated.The drawings are usually needed for making screw-on neodymium magnets.
The maximum working temperature of neodymium screw-on magnets
Neodymium Material Grade | MaximumWorking Temp. | Curie Temp. |
N(N35,N38,N40,N42,N45,N48,N50,N52) | 176°F (80°C) | 590°F (310°C) |
N-M(N35M,N38M,N40M,N42M,N45M,N48M,N50M,N52M) | 212°F (100°C) | 644°F (340°C) |
N-H(N35H,N38H,N40H,N42H,N45H,N48H,N50H) | 248°F (120°C) | 644°F (340°C) |
N-SH(N35SH,N38SH,N40H,N42SH,N45SH,N48SH) | 302°F (150°C) | 644°F (340°C) |
N-UH(N28UH,N30UH,N33UH,N35UH,N38UH,N40UH,N42UH) | 356°F (180°C) | 662°F (350°C) |
N-EH(N28EH,N30EH,N33EH,N35EH,N38EH,N40EH) | 392°F (200°C) | 662°F (350°C) |
N-AH(N28AH,N33AH,N35AH,N38AH) | 428°F (230°C) | 662°F (350°C) |
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