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Disc Neodymium Magnets
CMS Magnetics & Magnets For Sale carry wide Variety of Neodymium disc Magnets of Grade N42 – N52 Neodymium disc Magnets Order Online or Over the Phone. Cylindrical magnets & Countersunk Disc magnets can be found here at Magnets For Sale.
Here at CMS Magnetics & Magnets For Sale we carry Strong neodymium discs 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 disc magnets even allow the screw’s head to reside below or even with the face of the magnet to ensure it does not interfere with the magnet’s function.
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A great Quick education in how to select your Disc Magnets
How to select the proper Strength Disc Magnets magnets for your project in 13 sentences
The truth about magnets
At CMS Magnetics & Magnets For Sale we sell magnets to the hobbyist and to industry with no minimum purchase. We get them to you FAST. CMS Magnetics & Magnets For Sale is rated A+ by the BBB. Our Customer Service people will help you over the phone if you have only a small idea what you need and gladly take your order right there over the phone. They do not work on commission, they really like to help people get it right and are some really nice people. Really! Or you can order on the website.
A larger magnet of the same material and grade (think strength) will be stronger.
In order of strength the strongest magnetic material first: Neodymium, Samarium Cobalt, Ceramic, AlNiCo.
Ceramic magnets are the household magnets or the ones you probably played with as a child.
If you have 2 magnets that are attracted to each other (stuck together) and you didn’t say “wow how am I ever going to get these separated?” They were not Neodymium. We can show you how to separate them.
The least strong grade of strong neodymium (N32) is much stronger than the strongest ceramic magnets.
Even Strong Neodymium magnets lose all of their magnetic strength at about 175o Fahrenheit.
Neodymium magnets corrode in the weather. 6 months in the elements and it is a mess.
Samarium Cobalt (SmCo) is a little more expensive and a little less strong but is a great substitute in the above conditions (#6 & #7).
Do not let your children under about the age of 10 play with Neodymium magnets larger than 1 “ in diameter. They will get pinched. If they play with 2 magnets much larger than that they may get a finger broken. When I started working at CMS I almost got my finger broken by 2 21/2 “ magnets slamming together with my finger between them. Do not place these magnets into orifices of the body. Swallowing 2 small neodymium magnets will cause them to attract to each other along the digestive tract very possibly pinching inner linings and may puncture stomach or intestinal linings (NO JOKE HERE!)
Most small scale hobbies will do OK with Ceramic magnets however, a refrigerator magnet or tea towel with a small neodymium magnet in it will NOT slide down the refrigerator.
It is not advised that you make a kitchen knife Holder using a ceramic magnet, eventually someone will get hurt. Use Neodymium.
All magnets are somewhat brittle. Treat a 1/8th in thick neodymium disc like fine china and it will last a lifetime. A neodymium Disc ½ inch thick is much stronger and the light hand is really not needed but it may still chip.
Some Safety Considerations with your Strong Neodymium disc magnets
1 Children should not be allowed to handle Strong neodymium magnets. Small magnets are a choking hazard and should never be swallowed or inserted into any part of the body.
2Individuals with pacemakers should not handle strong rare-earth magnets . Magnetic fields can affect the operation of these devices.
3 The Rare-Earth Magnetics Association is not aware of any positive or negative health effects from handling rare-earth magnets. CMS Magnetics & Magnets For Sale recommends however that pregnant women not handle very strong rare-earth magnets.
4 The strong magnetic fields of neodymium magnets can damage items such as television, computer monitors, credit cards, bank cards, computers, diskettes and other data carriers, video tapes, mechanical watches, & hearing aids.
5 When handling magnets Rare-Earth magnetic products are very powerful and can accelerate a great speeds toward each other and ferrous material. You should always wear gloves and eye protection when handling strong rare-earth magnets.
6 You should avoid having constant contact with magnets of any size and keep a distance of at least 3 feet to large magnets.
7 Under no circumstances should you try to machine Neodymium magnets! These rare earth magnets will crack, shatter and create a flammable toxic dust.
8 Neodymium magnets will lose their magnetic properties if heated above (150 C).
9 All of magnets are plated with a thin layer of nickel, nickel-copper-nickel or gold. This layer (in particular gold) can wear down in the normal use of the magnet over time.
10 Any tool or toy, neodymium magnets can be fun and useful, but must always be treated with care.
This is where the information gets a little deeper
The term “Permanent Magnets” really just refers to magnets that cannot be turned off like an electromagnet and will hold their magnetism indefinitely as long as certain conditions are met. Refrigerator magnets, magnetic jewelry & most office magnets are some examples of permanent magnets that you can find all around you. All magnets on this site are Permanent magnets. All permanent magnets can be classified into two main types, which are also known as families. The 2 types of families of permanent magnets that can be found are rare earth magnets and non-Rare earth magnets. The two magnetic materials that fall under the Rare earth magnet label Neodymium and Samarium Cobalt.
NdFeB magnets are made of an alloy of three elements, NdFeB (Neodymium, Iron, and Boron), that when joined together create super strong neodymium magnets. Many people use the term “rare earth magnet” and “neodymium magnet” interchangeably because neodymium magnets are the most popular and well-known of the rare earth group. Other common names for neodymium magnets include neo magnets, or NIB Magnets.
Due to their high strength and low cost, neodymium magnets revolutionized magnetic products. These magnets are the strongest developed thus far. Because neodymium magnets are between seven and fourteen times stronger than ceramic magnets, they are sometimes called super strong or powerful magnets. CMS magnetics sells the strongest neodymium rare earth permanent magnets on the market on Magnet4Sale.com with grades ranging from N35 to N52. Grade N52 neodymium disc magnets are the most powerful magnets so far and a grade N52 magnet measuring only ½” can have a pull force of 32 lbs! Our shop carries a variety of these powerful magnets for sale in different shapes, sizes, and grades to fit many different applications.
At Magnet4Sale.com & Magnets For Sale, we also sell custom neodymium magnets and custom magnetic assemblies so we can help you find the best fit for your project specifications.
CUSTOM NEODYMIUM MAGNETS
Physical properties of Sintered NdFeB Rare Earth Permanent Magnets
Remanence temperature coefficient-0.11%/CTemperature coefficient of coercive force correction-0.60%/C
Vickers hardness600Hvflexural strength25kg/mm
tensile strength8.0Kg/mm2coefficient of thermal expansion4X10 -6/C
specific heat0.12Kcal/Kgthermal conductivity7.7kcal/[m.h.C]
transverse deformation coefficient0.24compression ratio9.8x10-12m2/N
Curie temperature310-340 ?temperature80-200