Ferrite Ring Magnets

Ceramic Ferrite Ring Magnet

Ferrite Ring magnets can be used in a wide range of applications due to their high coercivity and low cost. Common applications include reed switches, loud speakers, security systems, audio and television and also holding devices such as pot magnets. These popular magnets offer a medium level of magnetism and a good depth of field.

A ferrite ring magnet is a ferrite disc magnet with a concentric hole inside it. A ferrite countersunk magnet is a ferrite ring magnet with one side appearing as a standard ring but the other side is seen as an angled countersink which allow a screw head to fit inside, the angle usually being (but not always) 90 degrees.

A ferrite counterbore ring magnet is a ring magnet with a cylindrical flat-bottomed hole on one side that enlarges the main central hole to take a cap head screw inside the magnet. Ferrite ring magnets are also known as ferrite pure rings, ferrite countersunk magnets, and ferrite counterbore magnets.

All the ferrite ring magnets are nearly always axially magnetised - the ferrite magnet is magnetised along its central axis. Unless stated otherwise the ferrite ring magnets, ferrite countersunk ring magnets and ferrite counterbore ring magnets are all axially magnetised. Axially magnetised magnets have one flat end circular face as a North and the other flat circular end face as a South. For pure ferrite rings, polarity is changed by simply turning the magnet over. For the countersunk and counterbore ferrite ring magnets, North versions have a North at the countersunk / counterbore side (with a South at the other end - which appears like a normal ring); South versions have a South at the countersunk / counterbore side (with a North at the other end - which appears like a normal ring).

In applications where the ferrite ring magnets are clamping onto ferromagnetic surfaces (e.g. mild steel), any version could be used - sometime placing in a N-S-N-S arrangement may give a small increase in performance as the magnets link their magnetism in a positive way. In applications where magnets are attracting magnets, just ensure that a North face of one magnet is attracting a South face of another magnet (unlike poles attract; like poles repel). When screwing ring magnets in place please do not over tighten the screws otherwise it may cause the Ferrite ring magnet to break. Ferrite magnets are brittle (like all magnets) and are not designed for load bearing (e.g. high clamping forces) We produce custom magnets.

Ferrite Magnets / Hard Ferrite

We specialize in industrial Ceramic magnets for sale online carries a large inventory of ceramic disc, block (rectangular & square), and ring magnets, available for immediate purchase in a wide range of shapes and sizes. Ferrite magnets, also known as ceramic magnets. The Ferrite permanent magnet is also known as a Ceramic Magnet and even as hard ferrite magnet. We offer a large inventory of ceramic disc, block (rectangular & square), and ring magnets.

Hard ferrite ceramic (Hard Ferrite) magnets were developed in the 1960’s as a low cost alternative to metallic magnets. Compared with other permanent magnet materials they exhibit low energy and relatively brittle and hard, ferrite magnets have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. It is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensor.

Buy ceramic magnets on-line today. Magnosphere carries a large inventory of ceramic disc, block (rectangular & square), and ring magnets, available for immediate purchase in a wide range of shapes and sizes.

Ceramic magnets (also known as "Ferrite" magnets) are part of the permanent magnet family, and the lowest cost, hard magnets available today.
Ceramic magnets are used for many consumer & commercial applications such as craft projects, refrigerator magnets, badge holders, latches, display boards, motors, lifting magnets, science projects, toys, games, POP displays, advertising giveaways & much more. We can also custom manufacture ceramic magnets to fit your exact specifications using our in-house global manufacturing facilities and experienced team of engineers.

Ferrite

Hard ferrite ceramic (Hard Ferrite) magnets were developed in the 1960’s as a low cost alternative to metallic magnets. Compared with other permanent magnet materials they exhibit low energy and relatively brittle and hard, ferrite magnets have won wide acceptance due to their good resistance to demagnetization, excellent corrosion resistance and low price per pound. It is the first choice for most types of DC motors, magnetic separators, magnetic resonance imaging and automotive sensor.

Features & Characteristics of Ceramic Magnets:

• What are the main characteristics for ceramic magnets? Ceramic magnets are medium in magnetic strength, and can be used at fairly high temperatures. They are low cost, making them ideal for applications such as automotive sensors, magnetic separators, craft projects, badge holders, latches, display boards, science projects, toys, games & more.
• What grades & shapes are available for ceramic magnets? Grades 5 (most commonly used) through 8 are available in disc, block (rectangle & square) and ring shapes, and can be custom manufactured to meet your specialty requirements.
• What are the temperature constraints for ceramic magnets? Ceramic magnets can be used at fairly high temperatures, although their magnetic properties drop with temperature. At 175°C (350° F), approximately 75% of their room temperature magnetic properties are retained.     How are magnets rated? Magnets are typically rated by their residual induction, coercive force & maximum energy product. Click here for more details (section 4.0). This refers to the maximum strength that the magnetic material can be magnetized to.
• What are some common applications for ceramic magnets? Common applications for ceramic magnets include raft projects, refrigerator magnets, badge holders, latches, display boards, loudspeakers, security systems, motors, generators & alternators, lifting magnets, eddy current devices, brakes, clamps, switches & relays, sweeper magnets, science projects, toys, games, motors, magnetic couplings, POP displays, advertising giveaways, promotional items, novelties & more.
• Are there machining constraints for ceramic magnets? Ceramic magnets require special machining techniques, and should be machined in an “un-magnetized” state. We are fully equipped to machine these materials to your specifications, just let us know what you are looking for by sending us a special request.
• Are surface treatments required for ceramic magnets? Ceramic magnets do not need to be protected for surface rust. A thin film of magnet powder on the surface is common.
• What are some bonding applications for ceramic magnets? Ceramic magnets are often assembled into products using "superglues" such as Loctite 325 or other epoxies. Please always ensure that bonding surfaces are clean and dry prior to bonding.
• What safety precautions should be taken into consideration when working with ceramic magnets? Ceramic Magnets are hard & brittle, and they can chip or break if dropped or snapped together, so please take special care when handling these magnets!

Available Grades of Ceramic Magnets:

Magnosphere offers Ceramic Magnets in a variety of grades, including Ceramic 1, Ceramic 5, Ceramic 8, and Ceramic 8B in strengths ranging from 1.05 – 3.8 MGOe.

Corrosion Resistance:

Ceramic magnets are very resistant to corrosion. Coatings can be applied for cosmetic reasons or to reduce the fine, ferrite powder which is associated with ceramic magnets.

Temperature Effects:

Ceramic Magnets are susceptible to demagnetization when exposed to temperature extremes. There are grades which have better resistance to high and low temperatures, but several factors will dictate the performance of a ferrite magnet.

Magnetization Options:

Although most commercial magnets are anistropic, which means they have a preferred direction of magnetization, various pole configurations can be achieved without conflicting with a Ceramic Magnet’s orientation.

Compliance and Intellectual Property Considerations:

Ceramic magnets manufactured by Magnosphere are compliant with Intellectual Property Rights, Environmental Restrictions, and Conflict Mineral usage.

• Dodd Frank Wall Street Reform Act (Section 1502
• RoHS, RoHS II and REACH

Handling and Storage of Ceramic Magnets:

Ceramic Magnets are very strong and brittle, requiring appropriate handling and packing to ensure safety and prevent damage.

Ceramic Magnet Manufacturing Methods:

Ceramic or Ferrite Magnets are produced by calcining a mixture of iron oxide and strontium carbonate to form a metallic oxide. A multiple stage milling operation reduces the calcined material to a small particle size. The powder is then compacted in a die by one of two methods. In the first method, the powder is compacted dry which develops an isotropic magnet with weaker magnetic properties, but with better dimensional tolerances. Oftentimes, a dry pressed magnet does not require finish grinding. In the second method, the powder is mixed with water to form slurry. The slurry is compacted in a die in the presence of a magnetic field. The applied field creates an anisotropic magnet which exhibits superior magnetic properties, but usually requires finish grinding. The compacted parts which approximate the finished geometry are then sintered at high temperatures to achieve the final fusion of the individual particles. Final shaping is achieved by diamond abrasives. Usually the pole faces of the ceramic (ferrite) magnets will be ground and the remaining surfaces will exhibit “as sintered” tolerances and physical characteristics.

Buy high quality Ferrit Ring Magnets at Magnosphere and get a better deal!

Magnosphere produces magnets at great prices, produced and delivered on time for all areas of industry, automotive, aerospace, electronics as well as in the design sector, trade fair construction, offices and for the home.

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All items are available for immediate delivery in large numbers with daily dispatch. Our selection is your win! Thousands of satisfied customers! Buy from a company with the highest quality standards and customer service with flexible and diverse payment options and conditions.

We can also custom manufacture these to fit your exact specifications using our in-house global manufacturing facilities and team of experienced engineers. Need high quantities of magnets at the lowest and fairest price possible? Just let us know what you are looking for and contact our Customer Care Team by sending us a request for quote! We'll work with you to determine the most economical way of providing you with what you need.

Trust in our experience and convince yourself of our service and our products and we look forward to welcoming you to our magnet shop at Magnosphere. You are welcome to contact us by eMail: info(at)magnosphere.co.uk. Available 24/7 x 365 and we are also there for you on public holidays! Or just give us a call.