sintered NdFeB Ring Magnet with irregular hole

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Trade Term: FOB
Payment Terms: T/T,L/C
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Basic Info.
  • Shape: Ring 
  • Application: Industrial Magnet 
  • Type: Permanent 
  • Composite: NdFeB Magnet 
  • Brand Name: Dongsheng magnet 
  • Grade: N35~N52 
  • coating:: NI ,ZN , Black epoxy 
  • size: According to customer require 
  • Model No.: R12 
  • Place of Origin: Zhejiang  
  • Min.Order: 2000 Piece/Pieces
  • Means of Transport: Ocean, Air
Supply Capacity
  • Production Capacity: 100000 one month
  • Packing:Box Carten
  • Delivery Date: 15~30 days
  A neodymium magnet is a type of rare-earth permanent magnet. It is made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. This material is currently the strongest type of permanent magnet in the world.

Pic shows the sintered NdFeB magnet with NiCuNi coating,the magnetized direction is axial.
Nd-Fe-B permanent magnet is manufactured in a wide range of shapes, sizes and grades according customer's demand.
NdFeB has a very high energy product and coercivity, can pick up 660 times of own weight of heavy objects.
The advantage is high cost-effective, with good mechanical properties, easy cutting; according customer's demand to manufacture in a wide range of shapes, sizes and grades.
Mostly of rare earth permanent magnet always work do not at room temperature or under vacuum, in order to keep the accuracy of shape size and avoid the Corrosion and oxidation, we must make the coating on the surface,such as zinc, nickel, silver, gold, etc., can also be done phosphorus treatment or spray epoxy resin to slow down the oxidation rate.

Magnetization direction

sintered NdFeB Ring Magnet with irregular hole
Sometime, the customers have high demand of NdFeB anti-corrosion, antioxidant, we can design the magnet,add some elements, such as: niobium, vanadium, cobalt and other metal to replace part of the iron to catch the customer requirements of the acid and alkali resistant,antioxidant level, however, because of special material, we need MOQ for it.

Sintered NdFeB magnetic energy parameters
GradeBr mT (kGs)Hcb kA/m (kOe)Hcj kA/m   (kOe)(BH)max kJ/m3Working Temperature (Tw)
N331130-1170(11.3-11.7)≥836 ( ≥ 10.5)≥955( ≥ 12)247-271(31-34)80 ℃
N351170-1220(11.7-12.2)≥868( ≥ 10.9)≥955( ≥ 12)263-287(33-36)
N381220-1250(12.2-12.5)≥899( ≥ 11.3)≥ 955( ≥ 12)287-310(36-39)
N401250-1280(12.5-12.8)≥907( ≥ 11.4)≥955 ( ≥ 12)302-326(38-41)
N421280-1320(12.8-13.2)≥915( ≥ 11.5)≥955( ≥ 12)318-342(40-43)
N451320-1380(13.2-13.8)≥923( ≥ 11.6)≥955 ( ≥ 12)342-366(43-46)
N481380-1420(13.8-14.2)≥923( ≥ 11.6)≥876( ≥ 12)366-390(46-49)
N501400-1450(14.0-14.5)≥796( ≥ 10.0)≥876( ≥ 11)382-406(48-51)60 ℃
N521430-1480(14.3-14.8)≥796( ≥ 10.0)≥876( ≥ 11)398-422(50-53)
30M1080-1130(10.8-11.3)≥796( ≥ 10.0)≥1114 ( ≥ 14)223-247(28-31)100 ℃
33M1130-1170(11.3-11.7)≥836( ≥ 10.5)≥1114( ≥ 14)247-263(31-33)
35M1170-1220(11.7-12.2)≥868( ≥ 10.9)≥1114( ≥ 14)263-287(33-36)
38M1220-1250(12.2-12.5)≥899( ≥ 11.3)≥1114( ≥ 14)287-310(36-39)
40M1250-1280(12.5-12.8)≥923( ≥ 11.6)≥1114( ≥ 14)302-326(38-41)
42M1280-1320(12.8-13.2)≥955( ≥ 12.0)≥1114( ≥ 14)318-342(40-43)
45M1320-1380(13.2-13.8)≥995( ≥ 12.5)≥1114 ( ≥ 14)342-366(43-46)
48M1360-1430(13.6-14.3)≥1027( ≥ 12.9)≥1114( ≥ 14)366-390(46-49)
50M1400-1450(14.0-14.5)≥1033 ( ≥ 13.0)≥1114( ≥ 14)382-406(48-51)

Note: The above mentioned data of magnetic parameters and physical are given at 20℃±2℃

The main physical properties of sintered NdFe Ring Magnet:
magnetic propertiesParameters
Density /g.cm3
Vickers Hardness HV
Resistivity /υΩ.cm
Compressive strength/
Coefficient of Thermal Expansion (C⊥)/K-1
Coefficient of Thermal Expansion (C∥) /K-1

the magnetic properties of rare earth magnet:
compare NdFeB and SmCo

The application of permanent magnet material, it is easy to only pay attention to the magnetic properties of materials, the stability of its great importance is not enough, the stability of the material used, including stability, temperature stability, external magnetic field under the action of stability, and ironmagnetic material exposure to the role of stability, stability under mechanical action, the stability of the-ray irradiation, chemical stability and so on.
So when you choose the magnet, pls consider more.


sintered NdFeB Ring Magnet with irregular hole

sintered NdFeB Ring Magnet with irregular hole

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Ningbo Dongsheng Strong Magnet Material Co.,Ltd.
13th building, Yangpu Road, Sanlian Village, Cicheng Town, Jiangbei, Ningbo, Zhejiang, China (Mainland)
Fax: 86-574-83005217
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