Black Epoxy Coated N52 Industrial Rare Earth Permanent Magnet With
20 mm Diameter
1. Ring Magnet Information
What are neodymium magnets? Are they the same as "rare earth"?
Neodymium magnets are a member of the rare earth magnet family.
They are called "rare earth" because neodymium is a member of the
"rare earth" elements on the periodic table. Neodymium magnets are
the strongest of the rare earth magnets and are the strongest
permanent magnets in the world.
What are neodymium magnets made from and how are they made?
Neodymium magnets are actually composed of neodymium, iron and
boron (they are also referred to as NIB or NdFeB magnets). The
powdered mixture is pressed under great pressure into molds. The
material is then sintered (heated under a vacuum), cooled, and then
ground or sliced into the desired shape. Coatings are then applied
if required. Finally, the blank magnets are magnetized by exposing
them to a very powerful magnetic field in excess of 30 KOe.
How is the strength of a magnet measured?
Gaussmeters are used to measure the magnetic field density at the
surface of the magnet. This is referred to as the surface field and
is measured in Gauss (or Tesla). Pull Force Testers are used to
test the holding force of a magnet that is in contact with a flat
steel plate. Pull forces are measured in pounds (or kilograms).
What does the "N rating", or grade, of the neodymium magnets mean?
The grade, or "N rating" of the magnet refers to the Maximum Energy
Product of the material that the magnet is made from. It refers to
the maximum strength that the material can be magnetized to. The
grade of neodymium magnets is generally measured in units millions
of Gauss Oersted (MGOe). A magnet of grade N42 has a Maximum Energy
Product of 42 MGOe. Generally speaking, the higher the grade, the
stronger the magnet.
2. What is the difference between the different platings and
Choosing different coatings does not affect the magnetic strength
or performance of the magnet, except for our Plastic and Rubber Coated Magnets. The preferred coating is dictated by preference or intended
application. More detailed specifications can be found on our Specs page.
♦ Nickel is the most common choice for plating neodymium magnets.
It is actually a triple plating of nickel-copper-
nickel. It has a shiny silver finish and has good resistance to
corrosion in many applications. It is not waterproof.
♦ Black nickel has a shiny appearance in a charcoal or gunmetal
color. A black dye is added to the final nickel plating
process of the triple plating of nickelcopperblack nickel.
NOTE: It does not appear completely black like epoxy coatings. It
is also still shiny, much like plain nickel plated magnets.
♦Zinc has a dull gray/bluish finish, that is more susceptible to
corrosion than nickel. Zinc can leave a black residue on
hands and other items.
♦ Epoxy is basically a plastic coating that is more corrosion
resistant as long as the coating is intact. It is easily scratched.
From our experience, it is the least durable of the available
♦ Gold plating is applied over the top of standard nickel plating.
Gold plated magnets have the same characteristics as
nickel plated ones, but with a gold finish
3. Specification About Ring Magnet
|Item||Black Epoxy Coated N52 Industrial Rare Earth Permanent Magnet With
20 mm Diameter|
|Delivery Time||7-15 days After the Payment|
Plastic bag + Little White Box + 8 Holes Foam Box + Iron Sheet in
air way + Big Canton Box
4. Ring Magnetize Direction
5. Other Available Products
6. Our Service
Ningbo Jinyu magnet Co.,Ltd locates in Ningbo,Zhejing province
,established in 1996.
It is a high-tech enterprise and specialized in studying and
resarch and applying NdFeB rare-earth permanent magnets.
All the permanent magnets achieved the standard ISO9001,and RoHS.We have series of proprietary technology and complete
localizationof equipment system.enabling multipe batches ,more
varieties,more Grades of flexible production. Our main products
include Sintered NdFeB permanent magnet,Bonded NdFeB permanent
magnet,Ferrite and all kinds of AlNiCo ,Smco,magnetic components
and so on.
7. Our Advantages
20 years‘ experience in the magnet manufaturing.
,ISO9001 and Rohs certificated.
Our own factory.
Stable quality with reasonable price:Zero after-sale quality
professional sales serve for you:completed product program for you.
8. Trade & Market
Total Annual Sales Volume:
US$20 Million - US$50 Million
70% - 80%
9. Product Detailed Picture