Permanent Magnet Manufacturer

Permanent Magnet Manufacturer & Supplier

Manufacturing permanent magnets / rare earth magnets and exporting permanent magnets to the world is the basis of KENENG’s business. As one of the most professional permanent magnet manufacturers in china, We can manufacture rare earth magnets (neodymium magnet, ferrite magnet, samarium cobalt magnet, ceramic magnet, alnico magnet, etc).

KENENG has a long history of professional magnetic technology, including patents supporting magnets and various export certificates, so we can provide customized permanent magnet products for your needs.

Are You an OEM Manufacturer?

Permanent Magnet Case

Custom Permanent Magnet

We are a magnet manufacturing company integrating R&D, production, and sales, with professional magnetic performance analysis instruments and experienced technical engineers. KENENG can quickly help you choose suitable magnetic products and overall application solutions. Of course, we can also custom permanent magnet according to customer needs.

The initial raw materials used in our products must meet the national quality standards before they can be put into storage, and then we can produce a perfect quality management system. The production process is strictly monitored to ensure that all finished products pass the inspection of the national inspection department. The industries that serve customers include motors, hardware, plastic electronic printing, packaging, toys, etc.

Custom Permanent Magnet

If you have any needs, please contact KENENG, we will provide you with the best quality service.

Custom Permanent Magnets Specifications

Ordering instructions:

Materials: N28/N30/N33/N35/N38/N40/N42/N45 (the greater the number, the stronger the magnetic force, and the temperature resistance is 80 degrees). High temperature-resistant ones can be customized.

  • The higher the performance, the stronger the magnetic force, and the higher the price. Therefore, the details should be determined according to the actual needs of customers. Generally, N33 is mainly used for products with low toy requirements, such as packaging boxes, and gift boxes. Medium and low-grade horn magnets mostly use the N35 brand.
  • Circular magnet: the specification is reported according to the diameter * thickness, and the unit is mm.
  • Square magnet: length x width x height are all represented by F. All units are calculated in millimeters. For example, f20mmx10mm means that the square magnet is 20mm long, 10mm wide, and 2mm thick. The last digit is the magnetization direction of the magnet. For example, the f20mmx10mm square has a magnetization direction of 2mm, so the magnetic surface is the strongest on the 20mm*10mm sides.

Sintered NdFeB Magnetic & Physical Properties

Residual InductionCoercive
Coercive Force
Max Product
Operating Tem.
N331120-117011.2-11. 7756-8369.5-10.5≥836≥10.5243-26331-3380
N381220- 128012.2-128756-8369.5-10.5≥836≥10.5286-31036-3980
N401250- 129012.5-12.9836-91510.5-115≥870≥11303-31838-4080
N421280- 132012.8-13.2836-91510.5-11.5≥870≥11318-34240-4380
N481380- 142013.8-14.2836-91510.5-11.5≥876≥11366-39046-4980
N501400- 145014.0-14.5836-91510.5-11.5 ≥880≥11376-40847-5180
N521420- 148014.2-14.8836-91510.5-11.5≥880≥11390-42249-5380
N33M1120-117011.2-11.7796-87610.0-11.0 ≥1035≥13247-26331-33100
N40M1250- 1300125-13.0836-91510.5-11.5≥1035≥13302-32638-41100
N48M1370- 143013.7-14.31035-107513.0-13.5≥1120≥14360-39245-49100
N33H1120-117011.2-11.7812-876 10.2-11.0 ≥1353≥17247-26331-33 120
N38H1210-125012.1-12 5876-95511.0-12.0≥1353≥17286-31036-39120
N42H1280-132012.8-13.2 955-103412.0-13.0 ≥1353≥17318-34240-43120
N45H1320-136013.2-13 6100-103412.5-13 0≥1353≥17344-37643-47120
N48H1370- 143013.7-14.3100-103512.5-13.0≥1353≥17366-39046-49120
N33SH1160-117011.2-11. 7812-876 10.2-11.0≥1600≥20247-26331-33150
N35SH1160-121011.6-12.1859-89210.8-11.2 ≥1600≥20263-27933-35150
N38SH1210-125012 1-12.5876-95511.0-12.0≥1600≥20286-31036-39150
N42SH1300- 135013.0-13.5 963-103512.0-13.0≥1600≥20312-34439-43150
N48SH 1370-143013. 7-14.31000-103512 5-13 0≥1600≥20366-39046-49150
N25UH970- 10509.7-10.5732-8129.2-10.2≥1989≥25183-19923-25180
N28UH1 040- 108010.4-10 8780-8129.8-10 2≥1989≥25207-22326-28180
N33UH 1130-11 7011.3-11.7852-92310.7-11.6≥1989≥25247-27131-34180
N33EH1140-11 8011.4-11.8835-84410.5-10.6≥2400≥30248-27231-34200
N28AH1040- 1 08010.4-10.8756-8369.5-10.5≥2786≥35207-23126-29200
N30AH1080-112010.8-11.2756-8379.5-10.6 ≥2786≥35223-24728-31200

Introduction of Permanent Magnets

The term permanent magnet derives from the ability of a magnet to retain an induced magnetic charge after it is removed from a magnetizing device. Permanent magnet materials are also called hard magnetic materials. Once a permanent magnet is magnetized, it can maintain a constant magnetism. In practice, permanent magnet materials work in the demagnetization part of the second quadrant of the hysteresis loop after deep magnetic saturation and magnetization. The commonly used permanent magnet materials are divided into Al Ni Co permanent magnet alloys, Fe Cr co permanent magnet alloys, permanent ferrite, rare earth permanent magnet materials, and composite permanent magnet materials.

Features of Permanent Magnets

Neodymium iron boron magnet: neodymium iron boron is the magnet with the highest commercialized performance found at present. It is called magneto king. It has extremely high magnetic properties. Its maximum magnetic energy product is more than 10 times that of ferrite, and it is also commonly known as magnetic steel, strong magnetism, etc. Its own machinability is also quite good. The maximum operating temperature can reach 200 ℃. And its hard texture, stable performance and good cost performance, it is widely used. However, because of its strong chemical activity, its surface must be treated.

Nd-Fe-B permanent magnetic material is a permanent magnetic material based on the intermetallic compound Nd2Fe14B. Compared with cast Al Ni Co permanent magnetic materials and ferrite permanent magnetic materials, Nd-Fe-B has a very high magnetic energy product and coercivity, and can absorb 640 times its own weight. The advantages of high energy density make NdFeB permanent magnet materials widely used in electronic technology and modern industry. It can reduce the weight of instruments, electroacoustic motors, magnetic separation and magnetization equipment, etc. The advantages of NdFeB are high-cost performance, easy processing, good mechanical properties, and so on. The disadvantage is that the Curie temperature is low, the temperature characteristics are poor, and it is easy to powder and corrode. Therefore, it needs to be improved by adjusting its chemical composition and adopting surface treatments to meet the requirements of practical applications. Manufacturing process Nd-Fe-B is manufactured by powder metallurgy process. Raw materials containing a certain proportion, such as neodymium, dysprosium, iron, cobalt, niobium, praseodymium, aluminum, copper, ferroboron, etc., are smelted into alloy steel ingots by medium frequency induction melting furnace, and then crushed into 3 ~ 5 μ M powder, which is pressed and formed in a magnetic field. The formed green body is sintered and compacted in a vacuum sintering furnace and tempered for aging. In this way, a permanent magnet blank with certain magnetic properties is obtained. After grinding, drilling, slicing and other processing procedures, the finished Nd-Fe-B products required by users can be obtained through surface treatment.

Matters Needing Attention of Permanent Magnets

  1. Service temperature

When selecting Nd-Fe-B magnets, customers should select their own magnet brand according to their working temperature. If the working temperature of the magnet is higher than the bearing temperature of the magnet brand, then the magnet will slowly demagnetize to no magnetism. So before ordering, please confirm the working temperature and the brand suitable for your use.

  1. Using environment

If the magnet device used is in the sealed state, it can be considered to select the magnet without electroplating or white zinc plating on the surface, which can save costs. If the magnet needs to be exposed to moist air, especially salt fog. In this case, it is recommended to consider the use of nickel-plated magnets. The magnet shall be stored in a dry and constant temperature environment, separated and wrapped with plastic, wood chips, hard paper, foam, etc. Keep away from ironware and objects easy to be magnetized, such as monitors, computers, televisions, mobile phones, etc.

  1. Handling and stacking

Neodymium iron boron strong magnetic material that is hard, brittle and has a strong magnetic field. It should be handled with care (especially large-size and thin pieces). When the strong magnet itself or other iron objects are attracted or separated, it should be operated carefully without impact. Otherwise, the magnet may be damaged or fingers may be pinched due to collision. Because neodymium iron boron is a kind of multi-metal alloy material, its density is 7 45, heavy and brittle. Therefore, special care should be taken when handling to avoid magnetic breakage. The storage environment should also be kept dry. Do not stack it directly on the ground. It is best to pad it with thick cardboard or place it on the shelf.

  1. Precautions for use

When the magnets cannot be separated, it is recommended to push them horizontally to stagger them. Do not pull them hard. Fix the whole magnet with your left hand, and use your index finger and thumb with your right hand to move out the magnet horizontally. Do not throw the removed magnet back into the magnet stack immediately after moving out. Please isolate the magnet immediately. Handle with care, far away from iron or magnetic objects. If you need to put the magnet back into the whole magnet, please put it back slowly and let the magnet suck back from the edge at a close distance. Hold the magnet firmly until the two magnets fit.

Permanent Magnet Manufacturing Process

How are powerful magnets produced? The manufacturing processes of NdFeB magnets, SmCo magnets, AlNiCo magnets, and ferrite magnets are also different. In terms of technology, there are sintered NdFeB magnets and bonded NdFeB magnets. We mainly focus on sintered NdFeB magnets.

Sintering is a simple and cheap method that can change the microstructure of materials to improve their magnetic properties of materials. Sintering is the forming process of materials, which has a more important impact on the density and microstructure of magnets.

How are permanent magnets made?

Magnet process flow

Batching → smelting and ingot making → milling → molding → sintering and tempering → magnetic testing → grinding → pin cutting → electroplating → finished products.

Among them, ingredients are the basis, and sintering and tempering is the key.

The production tools of NdFeB magnets include a melting furnace, crusher, ball mill, jet mill, isostatic pressing machine, sintering furnace, vacuum packaging machine, heat treatment vacuum furnace, magnetic property tester, and Gauss meter.

Nd-Fe-B magnet processing tool

There are special slicers, wire cutting machines, flat grinding machines, double-sided machines, drilling machines, chamfering machines, and electroplating equipment.

Production Machinery

Brand & 
Model No.
of Year(s)
Magnetizing apparatusDS-6*916Acceptable
Gluing MachineN/A16Acceptable
Cutting MachineN/A25Acceptable
Plastic-envelop machineN/A11Acceptable
Melting Fast Solidification FurnaceVI-300SC28Acceptable
Sintering FurnaceCTVAC248Acceptable
Automatic Magnetic Field Molding PressFulida118Acceptable
Rotary Hydrogen-crushing FurnaceN/A38Acceptable
Jet Milling MachineQLMR-300T18Acceptable

Testing Machinery

Brand & 
Model No.
of Year(s) 
Optical Image Measuring TesterEasson18Acceptable
Laser Particle Size MeterRODOS18Acceptable
Aging MachineN/A18Acceptable
Drying OvenN/A38Acceptable
ICP-AESPlasma 100018Acceptable
Carbon-sulfur AnalyzerCS-280018Acceptable
Oxygen-hydrogen AnalyzerOH-300018Acceptable
Salt Spray MachineEDESON18Acceptable
Wall pulleyHANDPI11Acceptable

What Processes Can We Use to Produce Permanent Magnet?

Application industries of Permanent Magnet

For Example:

  1. Electroacoustic field: speaker, voice receiver, microphone, alarm, stage audio, car audio, etc.

  2. Electronic appliances: permanent magnet mechanism vacuum circuit breaker, magnetic retention relay, electrical meter, water meter, sound meter, dry clarinet, sensor, etc.
  3. Motor field: VCM, CDDVD-ROM, generator, electric motor, servo motor, micromotor, motor, vibration motor, etc.
  4. Mechanical equipment: magnetic separation, magnetic separator, magnetic crane, magnetic machinery, etc.

  5. Medical care: nuclear magnetic resonance instrument, medical equipment, magnetic therapy health care products, magnetization fuel-saving device, etc.
  6. Other industries: magnetized wax proof, pipe scaler, magnetic fixture, automatic mahjong machine, magnetic lock,
Door & Window Magnetic Bags Magnetic Leather Goods Magnetic Toys Magnetic Tools Magnetic Craft Gift Bag.

Related Magnets Products

Why Choose KENENG?

Source Manufacturer

  • 10,000m2 of commercial land.
  • More than 600 sets of molds.
  • 150+ employees.
  • Annual output of more than 100 million yuan RMB.

High Quality

  • ISO, ROHS and Dun & Bradstreet certified.
  • Have multiple testing equipment to ensure quality.
  • Strict quality inspection.

Good Service

  • Professional R&D team.
  • A large number of magnets in stock with prompt delivery.
  • Products can be customized according to customer requirements.

Our Certifications

KENENG's Certifications

Packing & Delivery of Permanent Magnets


Small packages are usually shipped by express (such as FedEx, UPS, DHL, EMS, TNT, ARAMEX, etc).
Large quantity packages are usually shipped by sea, air, or truck.


We accept payment by T/T, L/C for formal orders and PayPal, VISA master card for sample orders.

FAQ of Permanent Magnets

Yes, we can custom magnet and provide OEM/ODM service.

No problem. Air shipment is ok with our magnetic shield package.

We can make the solution if you tell us the application environment or working temperature. We can make the magnet in different liquids and high temperatures. Our R&D DPT will offer you an optional proposal to solve the problem.

The magnetism decline is neglected, that’s why we call it Permanent Magnet.

Yes. our magnet materials and surface coating are environmental protection. We have RoHS/REACH/ISO relative certificates.

Yes, we could offer free samples for standard magnets, and you need to pay the freight.

Magnet’s force is no influence on human body, but it will influence your phone and electrical parts. Please keep away from electronic products and please be careful when you take and use them.