Ring Magnets

NdFeb Ring Magnets is one popular shape of Rare earth magnets and permanent magnets.

It is always manufactured via Cutting, Slicing, Drilling, and grinding etc .NdFeb Ring Magnets have the

following important factors such as ,Outer Diameter, Inner Diameter, Thickness etc

1. Grade of NdFeb Magnets: N33,N35,N38,N40,N42,N45,N48,N50,N52; 33M,35M,38M,40M,42M,45M,48M,50M;

33H,35H,38H,40H,42H,45H,48H; 33SH,35SH,38SH,40SH,42SH,45SH; 28UH,30UH,33UH,35UH,38UH,40UH; 28EH,

30EH,33EH,35EH,38EH; 28AH,30AH,33AH.

2. Coating of NdFeb Magnets: Zn,Cr3+Zn,Ni, NiCuNi, NiCu+Au, NiCu+Ag, Epoxy, NiCu+Epoxy.

3. Application of NdFeb Magnet: Toys, Package, Printer, Switchboard, Phone, Voice Coil Motors (VCM’s) in hard disk drives,

High Performance Motors, Brushless DC Motors, Magnetic Separation, Magnetic Resonance Imaging, Sensors, Loudspeakers etc

4. Popular sizes of NdFeb Ring Magnets:

6-1.5x3mm	6-2x2mm	10-3x4mm	10-4x3mm	10-4.3x4mm	10-5x1mm	10-5x2mm
10-5x5mm	10-7x3mm	12-4x6mm	15-6x6mm	15-8x6mm	15-10x2mm	15-11x4.5mm
16-12.5x8mm	19-6x6mm	20-5x8mm	20-6x8mm	20-8x6mm	20-10x2mm	20-10x3mm
20-10x6mm	23-12x5mm	35-16x5mm	34-5x12mm	35-12x6mm	40-20x10mm	40-23x6mm
50-5x5mm	26-12x9mm	27-21x3mm	40-25x5mm	60-6x30mm	100-10x15mm	100-50x5mm
8-6/3.5x3mm	10-7/3x3mm	10-7/3.5x3mm	10-7/3.5x5mm	12-8/4.2x3mm	12-8/4.2x5mm	14-7/3.5x3mm
14-8/4x3mm	14-7/3.5x5mm	15-7/3.5x5mm	15-7/3.5x3mm	15-7/3.5x4mm	16-7/3.5x3mm	18-7/3.5x3mm
18-7/3.5x5mm	20-7/3.5x3mm	20-7/3.5x5mm	22-7/3.5x3mm	25-7/3.5x3mm	25-7.5/4.5x5mm	25-7/3.5x4mm
30-7.5/4.5x3mm	30-7/3.5x4mm	30-7.5/4.5x5mm	40-10.4/5.5x5mm

Other sizes as customer’s request.

5. Terms of Delivery: EXW Ningbo, FOB Ningbo, FOB Shanghai, C&F your nearest international airport or seaport, DDU by air
to sea to your door, or by express such as TNT, UPS, DHL.

6. Terms of Payment: T/T, L/C and other payment as negotiation

Magnetic Properties of Sintered NdFeB Magnets
Grade	Remanence (Br)		Coercive Force (HcB)		Intrinsic Coercive Force （HcJ）		Max.Energy Product (B-H) Max		Max Operation Temp. ℃
	mT	KG	KA/m	KOe	KA/m	KOe	KJ/ m3	MGOe	Tw ℃
N30	1080-1130	10.8-11.3	≥ 796	≥ 10	≥ 955	≥ 12	233-247	28-31	80 ℃
N33	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 955	≥ 12	247-271	31-34	80 ℃
N35	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 955	≥ 12	263-287	33-36	80 ℃
N38	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 955	≥ 12	287-310	36-39	80 ℃
N40	1250-1280	12.5-12.8	≥ 907	≥ 11.4	≥ 955	≥ 12	302-326	38-41	80 ℃
N42	1280-1320	12.8-13.2	≥ 915	≥ 11.5	≥ 955	≥ 12	318-342	40-43	80 ℃
N45	1320-1380	13.2-13.8	≥ 923	≥ 11.6	≥ 955	≥ 12	342-366	43-46	80 ℃
N48	1380-1420	13.8-14.2	≥ 836	≥ 10.5	≥955	≥ 12	366-390	46-49	80 ℃
N50	1400-1450	14.0-14.5	≥ 796	≥ 10.0	≥ 876	≥ 11	382-406	48-51	60 ℃
N52	1430-1480	14.3-14.8	≥ 796	≥ 10.0	≥ 876	≥ 11	398-422	50-53	60 ℃
30M	1080-1130	10.8-11.3	≥ 796	≥ 10.0	≥ 1114	≥ 14	223-247	28-31	100 ℃
33M	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 1114	≥ 14	247-263	31-33	100 ℃
35M	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 1114	≥ 14	263-287	33-36	100 ℃
38M	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 1114	≥ 14	287-310	36-39	100 ℃
40M	1250-1280	12.5-12.8	≥ 923	≥ 11.6	≥ 1114	≥ 14	302-326	38-41	100 ℃

Magnetic Properties of Sintered NdFeB Magnets
Grade	Remanence (Br)		Coercive Force (HcB)		Intrinsic Coercive Force （HcJ）		Max.Energy Product (B-H) Max		Max Operation Temp. ℃
	mT	KG	KA/m	KOe	KA/m	KOe	KJ/ m3	MGOe	Tw ℃
42M	1280-1320	12.8-13.2	≥ 955	≥ 12.0	≥ 1114	≥ 14	318-342	40-43	100 ℃
45M	1320-1380	13.2-13.8	≥ 995	≥ 12.5	≥ 1114	≥ 14	342-366	43-46	100 ℃
48M	1360-1430	13.6-14.3	≥ 1027	≥ 12.9	≥ 1114	≥ 14	366-390	46-49	100 ℃
50M	1400-1450	14.0-14.5	≥ 1033	≥ 13.0	≥ 1114	≥ 14	382-406	48-51	100 ℃
30H	1080-1130	10.8-11.3	≥ 796	≥ 10.0	≥ 1353	≥ 17	223-247	28-31	120 ℃
33H	1130-1170	11.3-11.7	≥ 836	≥ 10.5	≥ 1353	≥ 17	247-271	31-34	120 ℃
35H	1170-1220	11.7-12.2	≥ 868	≥ 10.9	≥ 1353	≥ 17	263-287	33-36	120 ℃
38H	1220-1250	12.2-12.5	≥ 899	≥ 11.3	≥ 1353	≥ 17	287-310	36-39	120 ℃
40H	1250-1280	12.5-12.8	≥ 923	≥ 11.6	≥ 1353	≥ 17	302-326	38-41	120 ℃
42H	1280-1320	12.8-13.2	≥ 955	≥ 12.0	≥ 1353	≥ 17	318-342	40-43	120 ℃
45H	1320-1360	13.2-13.6	≥ 963	≥ 12.1	≥ 1353	≥ 17	342-366	43-46	120 ℃
48H	1370-1430	13.7-14.3	≥ 995	≥ 12.5	≥ 1353	≥ 17	366-390	46-49	120 ℃
30SH	1080-1130	10.8-11.3	≥ 804	≥ 10.1	≥ 1592	≥ 20	223-247	28-31	150 ℃
33SH	1130-1170	11.3-11.7	≥ 844	≥ 10.6	≥ 1592	≥ 20	247-271	31-34	150 ℃
35SH	1170-1220	11.7-12.2	≥ 876	≥ 11.0	≥ 1592	≥ 20	263-287	33-36	150 ℃
38SH	1220-1250	12.2-12.5	≥ 907	≥ 11.4	≥ 1592	≥ 20	287-310	36-39	150 ℃

Magnetic Properties of Sintered NdFeB Magnets

Grade

Remanence

(Br)

Coerc

The Applications Field of Magnets
**MOTORS	**ACTUATORS
--DC Motors	--Computer Drive Actuator
--DC Brushless Motors	--Loudspeakers
--Stepping Motors	--Research Area
--Magnetic Pumps	--Linear Encoders
--Linear Motors	--CD Rom Actuators
--Synchronous Motors	--Military Defense Use
--Washing Machine Motors	--Electromagnets
--Electric Motors for Fans	--Circular Encoders
--CD Rom Actuators
--Automotive Industry
--Rotor Magnets
**COUPLING	**SENSORS
--Magnetic Attachment	--Tachometer
--Magnetic Chuck	--Electricity Meter
--Magnetic Coupling	--Timers
--Magnetic Brakes	--Abs Automotive Sensors
--Flywheels	--Magnetic Sensors
--General Coupling Systems	--Reserach Area
--Magnetic Lifting	--Remote Control Valves
--Magnetic Bearing	--Motor Valves
--Magnetic Drives	--Speed Meter
--Magnetic Clutches	--Water Flux Meter

**Other Special Applications

--Toys

--Head Printers

--Electronic Beams Systems

--Sensor for Pneumatic Cylinders

--Magnet Valves

--Motor Valves

--Loudspeakers

--Magnetic Pumps**Applications of Automotive Industry

**Applications of Automotive Industry

**Applications of Household Industry

Available Coatings
Surface	Coating	Thickness (Microns)	Color	Resistance
Passivation		1	Silver Grey	Temporary Protection
Nickel	Ni+Ni	10-20	Bright Silver	Excellent Against Humidity
Nickel	Ni+Cu+Ni	10-20	Bright Silver	Excellent Against Humidity
Zinc	Zn	8-20	Bright Blue	Good Against Salt Spray
Zinc	C-Zn	8-20	Bright Blue	Good Against Salt Spray
Tin	Ni+Cu+Sn	15-20	Shinny Color	Excellent Against Humidity
Gold	Ni+Cu+Au	10-20	Gold	Superior Against Humidity
Copper	Ni+Cu	10-20	Gold	Temporary Protection
Epoxy	Epoxy	15-25	Black, Red, Grey	Excellent Against Humidity& Salt Spray
	Ni+Cu+Epoxy
	Zn+Epoxy
Chemical	Ni	10-20	Silver Grey	Excellent Against Humidity
Parylene	Parylene	5-20	Grey	Excellent Against Humidity, Salt Spray, Superior Against Solvents, Gases, Fungi and Bacteria, FDA Approved

NiCuNI: The Nickel-Copper-Nickel(Ni-Cu-Ni) coating has excellent physical and chemical properties, like corrosion resistance, hardness, abrasive resistance

Au： Excellent resistance to high temperature, corrosion and colour changing

Ag： Enhanced corrosion resistance, increasing the conductivity

Epxoy： Epoxy resin has good physical and chemical properties, and has excellent adhesion strength on the surface of the metal and nonmetal materials, good dielectric properties

Zn： Blue white zinc coating is generally thinner than the Ni-Cu-Ni coating and anticorrosion ability is relatively good. Blue white zinc coating after