20x3mm round magnet with 4mm straight holes
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|
|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|
|33M- 48M||100°C (212°F)|
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:
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.