Neodymium Countersunk Ring Magnets

Name: Neodymium Countersunk Ring Magnets
Brand: Ningbo Beilun Meank Magnetics Co.,Ltd.

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
Nickel	Ni+Cu+Ni	10-20	Bright Silver	Good Against Salt Spray
Zinc	Zn	8-20	Bright Blue	Excellent Against Salt Spray
Zinc	C-Zn	8-20	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

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.

Custom 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)