Here at Magnets For Sale & CMS Magnetics we carry neodymium ring magnets with epoxy coatings and with a countersunk hole already drilled in the middle to attach it to nonmetallic materials such as wood or plastic.  These Ring magnets even allow the screw’s head to reside below or even with the face of the Ring magnets to ensure it does not interfere with the ring magnet function.

See Our Pinterest Page For Some Great Project Ideas

Order your Neodymium Ring Magnets online or over the phone.

In this ring magnet category, CMS has the Strong neodymium Ring magnets with epoxy coatings and Ring magnets with a countersunk hole already drilled in the middle to attach it to nonmetallic materials such as wood or plastic.  This feature at least doubles their usefulness. These neodymium Ring magnets even allow the screw’s head to reside below or even with the face of the Ring magnet ensuring it does not interfere with the magnet’s function.

• Our aim is to keep you happy with your new ring magnets by providing you with the friendliest customer service & best products out there.  We also offer a 100% MONEY BACK GUARANTEE for 30 days.
• These small wonders of physics are Coated with Ni+Cu+Ni Triple Layer Coating ,nickel, copper and nickel to give superior corrosion resistance and provide a smooth and clean finish like stainless steel.  
• In Many cases, you can order a specialized extra coating of epoxy or plastic if your application requires it making them even more valuable.
• These Neodymium Magnetic rings are a whopping 10-14 times Stronger than the strongest ceramic ring magnets.  This is the stuff of science fiction, here & now!
• So many applications for these strong Magnetic rings:  Homes WorkShops DIY Science Hobby Sorting metal items Hold things up Hold things down Homes Hobby Crafts Office and Much More.

Safety Warning: These neodymium magnets are not for children.  They may break and cut severely. Children that may place things in their mouths should be kept away from these magnets.  If taken into the mouth these neodymium magnets may pinch across internal organ membranes with deadly results.

These are rare earth super strong neodymium ring magnets and is made for holding stuff & that is what they do they do best!   

These are not the super strong neodymium ring magnets you played with as children 15-20 times the force of those old time  super strong neodymium  ring magnets. Never experienced Super powerful neodymium Magnetic rings? Now is the time! Our rare earth ring magnets have a high saturation magnetization & tetragonal crystalline structure ensuring top physical pulling force & maximum energy product from these strong magnets . These hold very well against steel surfaces with direct touch and direct pull. The magnetic strength will last forever under normal use.

Many Uses & Users For A Ring Magnet 

Cms magnetics’ super strong neodymium ring magnets are used by school teachers machinists magicians engineering and manufacturing students hobbyists inventors technicians DIYers Mars Rovers (yup up there) craft magnets uses hobbies therapy storage experiments science fairs magnetic bars labs garages schools offices refrigerator magnets & as a strong earth magnet

These powerful ring magnets neodymium are comprised of strong neodymium material makes them the strongest ring magnets of their size commercially available. These Ring magnets are axially magnetized so the north and south poles are on the flat surfaces, and the red line on one side of the ring magnet denotes which side the north pole is on. Neodymium ring magnets are strong magnets & are unique because of their extreme resistance to demagnetization.  These ring magnets  will only lose their magnetism if they're heated above 176 degrees Fahrenheit.  Our Strong Neodymium Ring Magnets have a special set of uses in the world of magnets. Ring magnets are specially suited to those magnetic repulsion experiments where you dangle 2 magnets from a string, but also Jewelry and in the medical field.  One magician we know even wanted one that looks like a wedding ring.  Hmmm, the methodology for the trick would be hiding in plain site. 

About Neodymium In General

Neodymium magnets overall, are the world's strongest permanent magnets. Although, not all neodymium Ring magnets share the same characteristics. The Grade of a Neodymium Magnet will provide an idea of the strength of a neodymium magnet. The most common commercially available grades generally run N35- N52.  N35 is the weakest (but by no means weak) and N52 is currently the strongest. There are some special use grades as well. A larger piece of neodymium of a weaker grade may be ultimately stronger than a smaller but higher grade piece. Our strong Ring magnets are designed & manufactured to meet stringent quality standards of both external and our own standards. 

Neodymium Magnets are the popular  choice for Homes, Work, Shops, DIY, Science, Hobby, Crafts, Office, Fridge, Science, Fair, Just Plain Fun, Alternative, medicine, Sorting metal items, Hold things up, Hold, things, down, Duvet, Cover, Closures, Hanging, Art, scarves, jewelry, belts, Handbags & Classroom Decorations. 

Ring Magnets, Magnetics & Magnetism

This article will discuss the world of magnets from very different end users viewpoints.  Firstly the article is addressed to someone in a high school or maybe a 101 level in college to aid them in navigating this part of physics.  This portion of the article will also point to experiments that will demonstrate the points being made.  

Secondly this post will address the “what does that mean to me?” group.  Usually consumers of magnets whether they are a hobbyist searching for a small magnet to hand a photograph, an organizer searching for a way to straighten up a workshop or a manufacturer in search of enough magnets quickly to finish a current run on a manufactured product. 

Some portions of this article came from Wikipedia, the free encyclopediaand are being used under the creative commons share & Share alike clause.  Those portions may be used by anyone. Other portions belong to CMS Magnetics & Magnets For Sale & are copyrighted and may not be used without written permission. 

Magnets This article is about objects, materials, devices that produce magnetic fields. Most of the subject matter here covers all Neodymium Ring Magnets  . We will in many cases be using the term “Neodymium Ring Magnets” as the example, as this is the title & subject matter of this particular category. 

The information given applies not only to the Neodymium Ring Magnets  but the composition of all Neodymium Magnets .

Neodymium Ring Magnets are made of neodymium, an iron alloy. The Ring magnet, made in the shape of a Ring, the 2 magnetic poles in this case are through the thickness. This shape of a magnet make it very useful in both industry and by the casual consumer.  The Ring Magnet’s shape is one of the major divisions of magnets. The Ring Magnet needs to physically fit where the consumer needs it to fit. Neodymium is a magnetic material that was applied to magnets in the 1980s. Neodymium is the strongest Ring Magnet   in the world. Actually the material is the strongest permanent Ring Magnet in the world. The term “permanent” is just saying that you cannot turn it off & on at will as in an electromagnet.  

Neodymium Ring MAGNET

Magnetic field lines of a Neodymium Ring Magnet   as illustrated below with the iron filings.

Here is a short video showing and easy experiment performed with a neodymium cube magnets and some iron filings that will demonstrate the magnetic field produced by this product.

The magnetic field can also be seen with a piece of  Magnetic View Film Green 4x6".

The magnetic field can be said to be its area of influence.  As you can see this Influence (strength) drops off sharply when moving away from the magnet.

Ferromagnetic materials can be divided into magnetically "soft" materials like annealediron, which can be magnetized but do not tend to stay magnetized, and magnetically "hard" materials, which do. Permanent magnets are made from "hard" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture, to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. "Hard" materials have high coercivity, whereas "soft" materials have low coercivity. The overall strength of a magnet is measured by its magnetic moment or, alternatively, the total magnetic flux it produces. The local strength of magnetism in a material is measured by its magnetization.

An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a sphere magnet when the current stops. Often, the coil is wrapped around a core of "soft" ferromagnetic material such as mild steel, which greatly enhances the magnetic field produced by the coil.

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet: a force that pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.

A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. An everyday example is a refrigerator magnet used to hold notes on the refrigerator door. Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic). These include the elements iron, nickel and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone. Although ferromagnetic (and ferrimagnetic) materials are the only ones attracted to a magnet strongly enough to be commonly considered magnetic, all other substances respond weakly to a magnetic field, by one of several other types of magnetism.

Ferromagnetic materials can be divided into magnetically "soft" materials like annealediron, which can be magnetized but do not tend to stay magnetized, and magnetically "hard" materials, which do. Permanent Neodymium Ring Magnets      are made from "hard" ferromagnetic materials such as alnico and ferrite that are subjected to special processing in a strong magnetic field during manufacture, to align their internal microcrystalline structure, making them very hard to demagnetize. To demagnetize a saturated magnet, a certain magnetic field must be applied, and this threshold depends on coercivity of the respective material. "Hard" materials have high coercivity, whereas "soft" materials have low coercivity. The overall strength of a sphere magnet is measured by its magnetic moment or, alternatively, the total magnetic flux it produces. The local strength of magnetism in a material is measured by its magnetization.

An electromagnet is made from a coil of wire that acts as a magnet when an electric current passes through it but stops being a magnet when the current stops. Often, the coil is wrapped around a core of "soft" ferromagnetic material such as mild steel, which greatly enhances the magnetic field produced by the coil

Discovery And Development

Main article: History of electromagnetism

Ancient people learned about magnetism from lodestones (or magnetite) which are naturally magnetized pieces of iron ore. The word magnet was adopted in Middle English from Latinmagnetum "lodestone", ultimately from Greek μαγνῆτις [λίθος] (magnētis [lithos])[1] meaning "[stone] from Magnesia",[2] a part of ancient Greece where lodestones were found. Past civilizations learned of the existence of magnetism from, (curiously enough) a stone called magnetite (also called loadstone).  This was naturally magnetized pieces of iron ore. Some of this loadstone dangling on a string was actually the first compass. So with this man had discovered that there was a connection between the magnetism in that little rock and the earth.  

The earliest known surviving descriptions of magnets and their properties are from Greece, India, and China around 2500 years ago. By the 12th to 13th centuries AD, magnetic compasses were used in navigation in China, Europe, the Arabian Peninsula and elsewhere. 

Physics

Magnetic field

Another magnetic field demonstration using Iron filings that have oriented in the magnetic field produced by a aa Neodymium Ring Magnet   . 

Measurement of Magnetic Strength 

Magnetic flux density A vector quantity measuring the strength and direction of the magnetic field around a magnet.  

Magnetic flux density also can be understood as the density of magnetic lines of force, or magnetic flux lines, passing through a specific area. It is measured in units of tesla.  Also called magnetic flux.

Magnetic flux density is measured with a flux capacitor .   The measurements may be in either Gauss or Teslas. Both of these measures are named after scientist in the field.   A typical Gauss measure of a magnetic field of N52 ( the strongest Grade of neodymium may be 14,500 Gauss but measured in Tesla is 14.5 Tesla.  The ratio is 1 to 1000.

Nikola Tesla  1846-1945 Worked with both George Westinghouse and Thomas Edison in the early years of electrifying America.  He is known for his work in A.C. current and electromagnetism.

Fredrick Gauss 1777- 1855 was mostly a mathematician but also responsible for measurements of magnetic strengths.

The magnetic flux density (also called magnetic B field or just magnetic field, usually denoted B) is a vector field. The magnetic B field vector at a given point in space is specified by two properties:

1. Its direction, which is along the orientation of a compass needle.

2. Its magnitude (also called strength), which is proportional to how strongly the compass needle orients along that direction.

In SI units, the strength of the magnetic B field is given in 

Magnetic moment

and source. If the field is uniform in space, the magnet is subject to no net force, although it is subject to a torque.[11]

A wire in the shape of a circle with area A and carrying currentI has a magnetic moment of magnitude equal to IA.

Detecting magnetic field with compass and with iron filings

Main article: Magnetic field

The magnetic flux density (also called magnetic B field or just magnetic field, usually denoted B) is a vector field. The magnetic B field vector at a given point in space is specified by two properties:

3. Its direction, which is along the orientation of a compass needle.

4. Its magnitude (also called strength), which is proportional to how strongly the compass needle orients along that direction.

In SI units, the strength of the magnetic B field is given in teslas.[8]

Magnetic moment

Main article: Magnetic moment

A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a aa Neodymium Ring Magnet   , the direction of the magnetic moment points from the magnet's south pole to its north pole,[9] and the magnitude relates to how strong and how far apart these poles are. In SI units, the magnetic moment is specified in terms of A·m2 (amperes times meters squared).

A magnet both produces its own magnetic field and responds to magnetic fields. The strength of the magnetic field it produces is at any given point proportional to the magnitude of its magnetic moment. In addition, when the magnet is put into an external magnetic field, produced by a different source, it is subject to a torque tending to orient the magnetic moment parallel to the field[10] The amount of this torque is proportional both to the magnetic moment and the external field. A sphere magnet magnet may also be subject to a force driving it in one direction or another, according to the positions and orientations of the Neodymium Ring Magnets      and source. If the field is uniform in space, the magnet is subject to no net force, although it is subject to a torque.[11]

A wire in the shape of a circle with area A and carrying currentI has a magnetic moment of magnitude equal to IA.

Neodymium magnets

Description

Neodymium magnet (also known as NdFeB) is the type of permanent magnet most widely used in various industrial and household products due to its (1) large magnetic strength, (2) high resistance to demagnetization, and (3) relatively cheap price.  Though it is discovered in 1984, later than most of other types of permanent magnets,a Neodymium Ring Magnet is replacing alnico and ceramic magnets in many applications.

Neodymium is a rare earth metal anda Neodymium Ring Magnet   is an alloy composed of neodymium, iron and boron atoms that are organized in a microcrystalline structure with a chemical formula of Nd2Fe14B. Because of the low temperature (-254.2/-425.5 ºC/ºF) at which the ferromagnetism of neodymium metal disappears (or called Curie temperature), a certain amount of iron is present ina Neodymium Ring Magnet   in order to increase the Curie temperature well above room temperature.

During manufacturing and under an external magnetic field, the spin of 4 unpaired electrons in neodymium atoms (compared 3 in iron) can align along the same direction giving rise to a strong magnet with a magnetic energy 18 times larger than traditional ferrite magnets.  The difficulty of its reorientation of magnetization leads to a high level of resistance to being demagnetized. The boron atoms in Neodymium Ring Magnets do not contribute directly to the magnetism but improve cohesion by strong covalent bonding. The relatively low content of rare earth (12% by volume) in Neodymium Ring Magnets     lower their price compared with other rare earth magnets like samarium-cobalt magnets.

Our company (CMS & Magnets For Sale) is among leading magnetic product suppliers carrying a wide variety (size, shape, grade, assembly) of high-qualitya Neodymium Ring Magnet  ic products. They are protected by triple layers of nickel-copper-nickel.

Properties

Demagnetization

Demagnetization can occur

(1) in the presence of an external magnetic field (e.g. in the vicinity of a motor)

Depending on the strength of the demagnetizing field, the magnetic flux of thea Neodymium Ring Magnet   may remain the same or loss partially, and this process can be reversible or irreversible. When the demagnetizing field exceeds a critical value, the magnet's coercivity, thea Neodymium Ring Magnet   will be demagnetized and re-magnetized depending on the magnetic direction of the external field.

(2) by increasing temperature.

when temperature is raised, thermal (random) motion exerts more force to re-orientate the initially aligned (domain atoms) spins causing demagnetization of the Neo magnet.   This demagnetization can be permanently or temporary depending on the level of the elevated temperature. The ability of aa Neodymium Ring Magnet to resist demagnetization by increasing temperature is measured by two parameters, the magnet's maximum operating temperature (MaxOpTemp) and Curie temperature as shown by the table below for different grades of Neodymium Ring Magnets    . For a standard N grade of Neodymium Ring Magnets , their magnetic flux will permanently loss a fraction of the strength at their maximum operating temperature and loss all of their magnetic strength at their Curie temperature. For example, most Neodymium Ring Magnets start to loss their magnetization above 80/176 ºC/ºF.  Special grades of Neodymium Ring Magnets     with a higher Curie temperature (up to 220/428 ºC/ºF) have been developed to work at a high temperature such as in windmills, hybrid motors, etc.  Thus, in choosing Neodymium Ring Magnets it is imperative to consider which grade of Neodymium Ring Magnets     is best suited to your needs in terms of the operating temperature setting.

Neodymium Grades

Neodymium Neodymium Ring Magnets      are graded in terms of (1) their strength of magnetic field as measured by the remanence (Br) or the energy product (BHmax) and their resistance to being demagnetized by temperature changes as measured by the maximum operating temperature or the Curie temperature (cf. table below).  Some grades of Neodymium Ring Magnets     are designated as

N35-N55

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