Gold Member Since 2012
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Ningbo Sine Magnetic Co., Ltd.

Small Round Magnet, Magnet, Permanent Magnet manufacturer / supplier in China, offering Small Round Magnet / Disk Magnet / N35 N40 N45 N52, Convenient Innovation Magnetic Writing Board/ Promotion Gift, Ring Neodymium (NdFeB) Magnet and so on.

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Supplier Homepage Product NdFeB Magnet Small Round Magnet / Disk Magnet / N35 N40 N45 N52

Small Round Magnet / Disk Magnet / N35 N40 N45 N52

FOB Price: US $1 / Piece
Min. Order: 1 Piece
Min. Order FOB Price
1 Piece US $1/ Piece
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Production Capacity: 100000 Per Month
Transport Package: International Standard Package
Payment Terms: T/T, Western Union

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Basic Info
  • Model NO.: D20X5MM/ D10X2MM/ D5X2MM
  • Application: Speaker Magnet, Industrial Magnet, Jewelry Magnet, Solenoid, Motor Magnet
  • Type: Permanent
  • Trademark: SINE
  • Origin: Ningbo
  • Shape: Round
  • Coating: Nickel
  • Composition: NdFeB Magnet
  • Specification: SGS
  • HS Code: 8505111000
Product Description
Round NdFeB Magnet

Round NdFeB magnet is an alloy magnet made from ND, Fe, B and other trace metal elements. It is a rare earth magnet known so far for the strongest magnetism as well as high performance (8MGOe-55MGOe) and good coercive force. Proven production process, strict quality assurance, complete technical service and remarkable cost performance.

Machining and tolerances

Neodymium is easily ground, although coolants must be used in the process to avoid spontaneous combustion of powder. Grinding should be completed before coating or plating is applied to protect the magnets from corrosion. Standard tolerances for neodymium magnets are +/-0.05mm for ground dimensions.

Temperature constraints

The temperature coefficient of neodymium has triggered several grades to be developed to meet specific operating requirements. Please refer to our chart of magnetic properties to compare the characteristics of each grade. Before choosing a neodymium magnet be sure to consider your application's maximum operating temperature.

Added value services

Our knowledgeable engineering department is always available to assist in determining the best grade and size of neodymium magnet for your application. We also offer coating and plating choices for magnets we custom-machine.
Technical Data of Sintered NdFeB Magnet
GradeBrHcbHcj(BH)max (Tw)
mT(kGs)kA/m(kOe)kA/m(kOe)kJ/m3(MGOe)
N351170-1220(11.7-12.2)≥868( ≥10.9)≥955( ≥12)263-287(33-36)80 ºC
N381220-1250(12.2-12.5)≥899( ≥11.3)≥955( ≥12)287-310(36-39)80 ºC
N401250-1280(12.5-12.8)≥907( ≥11.4)≥955( ≥12)302-326(38-41)80 ºC
N421280-1320(12.8-13.2)≥915( ≥11.5)≥955( ≥12)318-342(40-43)80 ºC
N451320-1380(13.2-13.8)≥923( ≥11.6)≥955( ≥12)342-366(43-46)80 ºC
N481380-1420(13.8-14.2)≥923( ≥11.6)≥876( ≥12)366-390(46-49)80 ºC
N501400-1450(14.0-14.5)≥796( ≥10.0)≥876( ≥11)382-406(48-51)60 ºC
N521430-1480(14.3-14.8)≥796( ≥10.0)≥876( ≥11)398-422(50-53)60 ºC
30M1080-1130(10.8-11.3)≥796( ≥10.0)≥1114( ≥14)223-247(28-31)100 ºC
33M1130-1170(11.3-11.7)≥836( ≥10.5)≥1114( ≥14)247-263(31-33)100 ºC
35M1170-1220(11.7-12.2)≥868( ≥10.9)≥1114( ≥14)263-287(33-36)100 ºC
38M1220-1250(12.2-12.5)≥899( ≥11.3)≥1114( ≥14)287-310(36-39)100 ºC
40M1250-1280(12.5-12.8)≥923( ≥11.6)≥1114( ≥14)302-326(38-41)100 ºC
42M1280-1320(12.8-13.2)≥955( ≥12.0)≥1114( ≥14)318-342(40-43)100 ºC
45M1320-1380(13.2-13.8)≥995( ≥12.5)≥1114( ≥14)342-366(43-46)100 ºC
48M1360-1430(13.6-14.3)≥1027( ≥12.9)≥1114( ≥14)366-390(46-49)100 ºC
50M1400-1450(14.0-14.5)≥1033( ≥13.0)≥1114( ≥14)382-406(48-51)100 ºC
30H1080-1130(10.8-11.3)≥796( ≥10.0)≥1353( ≥17)223-247(28-31)120 ºC
33H1130-1170(11.3-11.7)≥836( ≥10.5)≥1353( ≥17)247-271(31-34)120 ºC
35H1170-1220(11.7-12.2)≥868( ≥10.9)≥1353( ≥17)263-287(33-36)120 ºC
38H1220-1250(12.2-12.5)≥899( ≥11.3)≥1353( ≥17)287-310(36-39)120 ºC
40H1250-1280(12.5-12.8)≥923( ≥11.6)≥1353( ≥17)302-326(38-41)120 ºC
42H1280-1320(12.8-13.2)≥955( ≥12.0)≥1353( ≥17)318-342(40-43)120 ºC
45H1300-1360(13-13.6)≥963( ≥12.1)≥1353( ≥17)326-358(43-46)120 ºC
48H1370-1430(13.7-14.3)≥995( ≥12.5)≥1353( ≥17)366-390(46-49)120 ºC
30SH1080-1130(10.8-11.3)≥804( ≥10.1)≥1592( ≥20)223-247(28-31)150 ºC
33SH1130-1170(11.3-11.7)≥844( ≥10.6)≥1592( ≥20)247-271(31-34)150 ºC
35SH1170-1220(11.7-12.2)≥876( ≥11.0)≥1592( ≥20)263-287(33-36)150 ºC
38SH1220-1250(12.2-12.5)≥907( ≥11.4)≥1592( ≥20)287-310(36-39)150 ºC
40SH1240-1280(12.5-12.8)≥939( ≥11.8)≥1592( ≥20)302-326(38-41)150 ºC
42SH1280-1320(12.8-13.2)≥987( ≥12.4)≥1592( ≥20)318-342(40-43)150 ºC
45SH1320-1380(13.2-13.8)≥1003( ≥12.6)≥1592( ≥20)342-366(43-46)150 ºC
28UH1020-1080 (10.2-10.8)≥764( ≥9.6)≥1990( ≥25)207-231(26-29)180 ºC
30UH1080-1130 (10.8-11.3)≥812( ≥10.2)≥1990( ≥25)223-247(28-31)180 ºC
33UH1130-1170(11.3-11.7)≥852( ≥10.7)≥1990( ≥25)247-271(31-34)180 ºC
35UH1180-1220(11.8-12.2)≥860( ≥10.8)≥1990( ≥25)263-287(33-36)180 ºC
38UH1220-1250(12.2-12.5)≥876( ≥11.0)≥1990( ≥25)287-310(36-39)180 ºC
40UH1240-1280(12.5-12.8)≥899( ≥11.3)≥1990( ≥25)302-326(38-41)180 ºC
28EH1040-1090(10.4-10.9)≥780( ≥9.8)≥2388( ≥30)207-231(26-29)200 ºC
30EH1080-1130(10.8-11.3)≥812( ≥10.2)≥2388( ≥30)223-247(28-31)200 ºC
33EH1130-1170(11.3-11.7)≥836( ≥10.5)≥2388( ≥30)247-271(31-34)200 ºC
35EH1170-1220(11.7-12.2)≥876( ≥11.0)≥2388( ≥30)263-287(33-36)200 ºC
38EH1220-1250(12.2-12.5)≥899( ≥11.3)≥2388( ≥30)287-310(36-39)200 ºC
28AH1040-1090(10.4-10.9)≥787( ≥9.9)≥2624( ≥33)207-231(26-29)230 ºC
30AH1080-1130(10.8-11.3)≥819( ≥10.3)≥2624( ≥33)223-247(28-31)230 ºC
33AH1130-1170(11.3-11.7)≥843( ≥10.6)≥2624( ≥33)247-271(31-34)230 ºC
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