N50 NdFeB Arc Magnet R11.15xR8.4×12.21mmx1.1mmx2.75mm

Specification of N50 NdFeB Arc Magnet R11.15xR8.4×12.21mmx1.1mmx2.75mm
Size	R11.15xR8.4×12.21mmx1.1mmx2.75mm
Tolerance	The diameter is ± 0.05mm and the thickness is ± 0.1mm
Coating	Nickel copper nickel
Magnetization direction	Thickness magnetization
Working temperature	The maximum working temperature is 80 ℃

Typical Magnetic Properties of Sintered NdFeB Magnets

Grade	Max. Energy Product		Remanence		Coercive Force				Rev. Temp. Coeff.		Curie Temp.	Max. Working Temp.
	(BH)max		Br		Hc		Hci		Bd	Hd	Tc	Tw
	MGOe	kJ/m3	kG	mT	kOe	kA/m	kOe	kA/m	%/°C	%/°C	°C	°C
N27	25-29	199-231	10.50	1050	>10.0	>796	>12.0	>955	-0.12	-0.60	310	80
N30	28-31	223-247	11.00	1100	>10.2	>812	>12.0	>955	-0.12	-0.60	310	80
N33	31-33	247-263	11.50	1150	>10.5	>836	>12.0	>955	-0.12	-0.60	310	80
N35	33-36	263-287	12.00	1200	>10.9	>868	>12.0	>955	-0.12	-0.60	310	80
N38	36-39	287-310	12.40	1240	>11.3	>899	>12.0	>955	-0.12	-0.60	310	80
N40	38-41	302-326	12.70	1270	>11.4	>907	>12.0	>955	-0.12	-0.60	310	80
N42	40-43	318-342	13.00	1300	>11.5	>915	>12.0	>955	-0.12	-0.60	310	80
N45	43-46	342-366	13.50	1350	>11.6	>923	>12.0	>955	-0.12	-0.60	310	80
N48	46-49	366-390	14.00	1400	>11.6	>923	>12.0	>955	-0.12	-0.60	310	80
N50	48-51	382-406	14.30	1430	>10.3	>820	>12.0	>955	-0.12	-0.60	310	80
N52	50-53	398-422	14.50	1450	>10.3	>820	>11.0	>877	-0.12	-0.60	310	80
N30M	28-31	223-247	11.00	1100	>10.2	>812	>14.0	>1114	-0.12	-0.59	320	100
N33M	31-33	247-263	11.50	1150	>10.5	>836	>14.0	>1114	-0.12	-0.59	320	100
N35M	33-36	263-287	12.00	1200	>10.9	>868	>14.0	>1114	-0.12	-0.59	320	100
N38M	36-39	287-310	12.40	1240	>11.4	>907	>14.0	>1114	-0.12	-0.59	320	100
N40M	38-41	302-326	12.70	1270	>11.6	>923	>14.0	>1114	-0.12	-0.59	320	100
N42M	40-43	318-342	13.00	1300	>12.0	>955	>14.0	>1114	-0.12	-0.59	320	100
N45M	43-46	342-366	13.50	1350	>12.5	>995	>14.0	>1114	-0.12	-0.59	320	100
N48M	46-49	366-390	14.00	1400	>12.9	>1027	>14.0	>1114	-0.12	-0.59	320	100
N50M	48-51	382-406	14.30	1430	>13.1	>1043	>14.0	>1114	-0.11	-0.58	320-350	100
N30H	28-31	223-247	11.00	1100	>10.2	>812	>17.0	>1353	-0.11	-0.58	320-350	120
N33H	31-34	247-271	11.50	1150	>10.5	>836	>17.0	>1353	-0.11	-0.58	320-350	120
N35H	33-36	263-287	12.00	1200	>10.9	>868	>17.0	>1353	-0.11	-0.58	320-350	120
N38H	36-39	287-310	12.40	1240	>11.4	>907	>17.0	>1353	-0.11	-0.58	320-350	120
N40H	38-41	302-326	12.70	1270	>11.6	>923	>17.0	>1353	-0.11	-0.58	320-350	120
N42H	40-43	318-342	13.00	1300	>12.0	>955	>17.0	>1353	-0.11	-0.58	320-350	120
N45H	43-46	342-366	13.50	1350	>12.5	>999	>17.0	>1353	-0.11	-0.58	320-350	120
N48H	46-49	366-390	14.00	1400	>12.9	>1027	>17.0	>1353	-0.11	-0.55	340-360	120
N30SH	28-31	223-247	11.00	1100	>10.2	>812	>20.0	>1592	-0.11	-0.55	340-360	150
N33SH	31-34	247-271	11.50	1150	>10.6	>844	>20.0	>1592	-0.11	-0.55	340-360	150
N35SH	33-36	263-287	12.00	1200	>11.0	>876	>20.0	>1592	-0.11	-0.55	340-360	150
N38SH	36-39	287-310	12.40	1240	>11.4	>907	>20.0	>1592	-0.11	-0.55	340-360	150
N40SH	38-41	302-326	12.70	1270	>11.8	>939	>20.0	>1592	-0.11	-0.55	340-360	150
N42SH	40-43	318-342	13.00	1300	>12.4	>987	>20.0	>1592	-0.11	-0.55	340-360	150
N45SH	43-46	342-366	13.50	1350	>12.6	>1003	>20.0	>1592	-0.11	-0.51	350-380	150
N28UH	26-29	207-231	10.60	1060	>9.6	>764	>25.0	>1990	-0.11	-0.51	350-380	180
N30UH	28-31	223-247	11.00	1100	>10.2	>812	>25.0	>1990	-0.11	-0.51	350-380	180
N33UH	31-34	247-271	11.50	1150	>10.8	>860	>25.0	>1990	-0.11	-0.51	350-380	180
N35UH	33-36	263-287	12.00	1200	>11.3	>899	>25.0	>1990	-0.11	-0.51	350-380	180
N38UH	36-39	287-310	12.40	1240	>11.5	>915	>25.0	>1990	-0.11	-0.51	350-380	180
N40UH	38-41	302-326	12.70	1270	>11.8	>939	>25.0	>1990	-0.11	-0.51	350-380	180
N28EH	26-29	207-231	10.70	1070	>9.8	>780	>30.0	>2388	-0.11	-0.51	350-380	200
N30EH	28-31	223-247	11.10	1110	>10.2	>812	>30.0	>2388	-0.11	-0.51	350-380	200
N33EH	31-34	227-271	11.50	1150	>10.8	>860	>30.0	>2388	-0.11	-0.51	350-380	200
N35EH	33-36	263-287	12.00	1200	>11.1	>884	>30.0	>2388	-0.11	-0.51	350-380	200
N38EH	36-39	287-310	12.40	1240	>11.5	>915	>30.0	>2388	-0.11	-0.51	350-380	200
N28AH	26-29	207-231	10.70	1070	>9.8	>780	>35.0	>2786	-0.11	-0.51	350-380	220
N30AZ	28-31	223-247	11.10	1110	>10.2	>812	>35.0	>2786	-0.11	-0.51	350-380	220
N33AH	31-34	227-271	11.50	1150	>10.8	>860	>35.0	>2786	-0.11	-0.51	350-380	220
N35AH	33-36	263-287	12.00	1200	>11.1	>884	>35.0	>2786	-0.11	-0.51	350-380	220

Grade & Working Temperature:	Grade	Max Operating Temperatures
	N35-N50	80°C     (176°F)
	35M-48M	100°C   (212°F)
	35H-45H	120°C   (248°F)
	33SH-42SH	150°C   (302°F)
	28UH-38UH	180°C   (356°F)

Neodymium Special Shaped Magnets with other Coating are also available:

Coating Type	Overall Thickness	Salt Spray Test	Pressure Cooker Test
Ni-Cu-Ni (Nickel)	15-21 μm	24 hours	48 hours
NiCu + Black Nickel	15-21 μm	24 hours	48 hours
NiCuNi + Epoxy	20-28 μm	48 hours	72 hours
NiCuNi + Gold	16-23 μm	36 hours	72 hours
NiCuNi + Silver	16-23 μm	24 hours	48 hours
Zinc	7-15 μm	12 hours	24 hours

Each individual layer of Nickel and Copper are 5-7 μm thick. The Gold and Silver Coating layers are 1-2 μm thick. Test results shown to allow comparison between Coating options. Performance in your application under your specific test conditions may vary. Salt Spray testing conducted with a 5% NaCl solution, at 35°C. Pressure Cooker Test (PCT) conducted at 2 atm, 120°C at 100% RH.

Shape	Max Size	Min Size
Block	L240*100*50mm	L1*1*0.5mm
Disc/Cylinder	D240*50mm	D1*0.5mm
Ring	OD240*40mm (hole size flexible as requested)	D1.5*0.5*1mm
Countersunk	OD240*40mm (hole size flexible as requested)	D8*2.5mm (hole size as customized)
Other special shapes	per as your request	per as your request

How to detect the quality of arc magnet?

The quality of strong NdFeB magnet is evaluated from two aspects: 1. Product performance; 2. Product appearance.

Product performance

There is a unified standard for the properties of Nd-Fe-B. the main indexes include magnetic energy product, coercivity and remanence.

Product appearance

Appearance inspection can be divided into five categories:

• 1. Scratches (including scratches, line marks, knife marks, etc.);

• 2. Pockmarks (including pockmarks, pockmarks, bubbles, scars, slag layer, local thickness, electroplating tumor);

• 3. Cracks (including cracks, cracks, etc.);

• 4. Edge chipping (including edge chipping, edge chipping and material residue);

• 5. Sand hole (including sand hole, air hole, pinhole, particle, etc.) to see whether there are missing edges and corners, whether the electroplated coating is in good condition, and whether the size meets the design requirements; Neodymium iron boron is generally electrodeposited to protect it from corrosion and rust. It is usually placed on a plane that can be adsorbed with a magnet of the same specification, such as a patch, blade, iron door, etc. the size of the magnetic force can be distinguished by the hand feeling.

Testing method of NdFeB arc magnet

• 1. For the products provided by the new supplier, according to the drawing requirements, first measure the overall dimension, and then measure the magnetic induction intensity with Gauss meter according to the brand of the magnet to check whether it is within the required range. Whether the magnetization direction is correct.
• 2. Conduct temperature rise and demagnetization test for 3-5 samples, mark three positions on each magnet, measure the magnetic induction strength of each magnet at three positions at room temperature, then put the magnet into the high temperature box, set the temperature at 75 ℃ and heat it at high temperature for 1 hour, then take out the magnet to measure the magnetic induction strength of the same three positions, make a record, cool it to room temperature, and then measure it in turn. Then set the temperature of high temperature box to 85 ℃ and 95 ℃ for measurement respectively, and the measurement method is the same as that of 75 ℃.
• 3. Check the measurement statistics, the demagnetization amount is less than 1% at 85 ℃
• 4. The salt spray test has been done by the supplier and the test report has been provided. The test time is more than 48 hours.
• 5. For the magnets used in batches, the appearance and dimension, magnetic induction strength of each batch shall be inspected to ensure the consistency within the batch: the open circuit magnetic flux is less than 2%, and the magnetic flux between batches is less than 3%
• 6. Several important technical parameters of magnets, such as coercivity, intrinsic coercivity and remanence, can not be measured. In the past, the supplier provided the testing parameters, and in the future, we can take a few pieces of each batch to a special testing agency for inspection.

Detection tools used

Micrometer, vernier caliper, Gauss meter, fluxmeter, film thickness meter and other measuring tools are generally used in the detection of finished NdFeB magnets.
The film thickness meter mainly measures the plating layer thickness of NdFeB magnet. The film thickness meter can effectively monitor the plating quality and flexibly adjust the magnet plating.
Micrometer and vernier caliper are mainly used to measure the tolerance of NdFeB magnet. The unit is mm.
Gauss meter is mainly used to measure the magnetic force of a point on the surface of the magnet, unit Gauss. Because the magnetic force of each point on the surface of the magnet is different, and the edge magnetic force is higher than that of the center point, the measured data error is too large.
Fluxmeter mainly measures the magnetic force of one side of NdFeB magnet, in Weber WB. Compared with Gauss meter, fluxmeter measures more objective and accurate data.
China Arc Magnet Manufacturer www.rizinia.com supplies Arc Magnet for scientific experiments or for industrial applications, in kinds of materials such as NdFeB/NIB/neodymium iron boron, etc.
This product is not a toy and is not to be used by children. This product is to be used for scientific experiments or for industrial applications. This product contains strong Neodymium magnet(s) that can be harmful or fatal if swallowed. Strong Neodymium magnets are fragile, they are brittle and will break or chip if they hit a hard surface or are snagged together. Always use the utmost care when handling Neodymium magnets.