20x3mm round magnet with 4mm straight holes

20x3mm round magnet with 4mm straight holes

Product Detail

Product Tags


Super Neodymium Magnet Made of neodymium,20x3mm round magnet with 4mm straight holes,the most powerful magnet material in the world. Super magnets are great for projects that require extreme strength in a small size. Magnets are brittle and can chip if dropped. Warning: Not for children.


China Manufacturer Disc Shaped Large Super High Grade Rare Earth Permanent Ndfeb Magnet.


Place of origin China
Item ID S1101N
Material NdFeB
Shape Disc
Diameter 20mm(hole 4mm)
Thickness 3mm
Tolerance ±0.03mm for diamater   /thickness, ±0.1mm for width/ length
Direction of magnetisation axial (parallel to height)
Coating Nickel-plated (Ni-Cu-Ni),can be Customised  Gold, Silver, Copper, Epoxy, Chrome, etc)
Grade Customized  N35 N38 N40 N42 N45 N48 N50 N52 ……
Max. Working Temperature Grade Max. Operating Temperatures
N35-N52 80°C (176°F)
33M- 48M 100°C (212°F)
33H-48H 120°C (248°F)
30SH-45SH 150°C (302°F)
30UH-40UH 180°C (356°F)
28EH-38EH 200°C (392°F)
28AH-35AH 220°C (428°F

Product show

ring magnet (6)

ring magnet (1)


Coating for your convenience

Neodymiun magnet are compsed mainly of neodymiun, iron and boron.if thet ar not plated, the iron in the material will oxidize very easily, particularly is exposed to moisture. Even normal humidity will rust any iron anywhere over time.

Nickel is the most common choice, as it is durable and cost-eddective.Our magnets are costed with a triple plating of nickle-copper-nickle.This created a shiny siliver finish and provides dependable resistance to corrosion in most applications. It is important to remember that no neodymium magnet,even with a plastic or golb coating, is completely waterproof.

More method of coating as below:

Magnet coating-1

Production Flow 

For the next 25 years Jintong was one of the leading neodymium magnet  manufacturers and shipped an average of 1 to 2 tons of finished neodymium magnetic material per month. We are constantly striving to add complimentary functions in order to consistently deliver value to the market place.

production flow_m


certificates from jintong_m

  • Previous:
  • Next:

  • Related Products