The flat and round shape NdFeB disc magnets with countersunk mounting holes are give the name of rare earth neodymium(NdFeB) countersunk ring magnets, which are special ring magnets and known as strong neodymium mountable magnets and screw on magnets. A strong neodymium countersunk ring magnet is expressed by out diameter(D) x inner diameter(d1/d2)x thickness(T).
Recognized as the most powerful commercially available magnets, neodymium countersunk ring magnets are the top choice for diverse consumer, commercial, and technical applications, especially widely used as magnetic holders in daily life.
Neodymium magnets with countersunk holes, available in various strengths (N35 to N52), feature countersunk holes for secure attachment to non-magnetic materials like wood or plastic. The countersunk design ensures a flush fit with the top surface, offering a sleek appearance and efficient performance.
Strong neodymium(NdFeB) countersunk ring magnets are easy to corrode, and their surface needs to be coated, generally including zinc plating, nickel, environmental protection zinc, environmental protection nickel, nickel copper-nickel, environmental protection nickel copper-nickel, epoxy coating, etc.
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 | ||||
Parylene | Parylene | 5-20 | Grey | Excellent Against Humidity |
Chemical | Ni | 10-20 | Silver Grey | Excellent Against Humidity |
Countersunk hole magnets come in diverse shapes and sizes, including the popular round or ring magnets. Paired configurations provide magnetic adherence, allowing users to attach two non-magnetic objects with substantial holding power. Whether individually or as a pair, these countersunk ring magnets offer versatile solutions for creative applications.
Screw-hole neodymium magnets are unique ring magnets. Thanks to the machinability of sintered Nd-Fe-B, we can customize strong neodymium countersunk ring magnets in various sizes without the need for molds. No matter the quantity, we can create small or large neodymium countersunk magnets with strength.
Neodymium Material Grade | Maximum Working 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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