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. Rare earth Ring Magnet Specification
|1.Electro-Acoustic Field||Receiver, Speaker, Microphone, Audio alarm stage, Loudspeaker|
Voice coil motor (VCM), CDDVD-ROM, Generator, Vibration Motor,
Brushless Motor, Vehicle Motor
|3.Electronics||watt-hour meter, count table , Pressure meter, Energy meter|
Valve, Magnetic separator, NC machine tool, De-ironing separator,
Magnetic drive pump, Magnetic Suspension System
|5.Medical Care||Magnet Therapy device, Nuclear Magnetic Resonance, MagnetJewelry|
|6.Others||Toy magnet, Bag magnet, Craft Gift Packag|
3. Shipping Package and Payment
|Item||Big Ring Zinc Coated N35 Neodymium Permanent Magnet For Electronic
|Plating||Zinc Nickel Nicuni|
|Lead time||7-10 days in 1000pcs|
|Package details||plastic bags+little white box+foam box(iron sheet added for air way
)+big canton box|
|Bulk manufacture time||500000pcs in per month|
|Delievery time||within 5 days in DHL , 20 days by sea|
|payment terms||FOB Ningbo,by TT,Western union,LC etc|
4. products picture