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Neodymium Countersunk Ring Magnets


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.


Surface Treatment of Rare Earth Strong NdFeB Magnets with Countersunk Mounting Hole


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


neodymium-countersunk-ring-magnets.jpg


Versatile Options for Various Applications


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.



neodymium-countersunk-ring-magnet.jpgCustom Strong Neodymium(NdFeB) Disc Magnets Countersunk Hole



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.




Maximum Working Temperature for Different Grade of Strong Neodymium Mountable Screw on Magnets


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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