1. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
Hi , My friend thanks for choice Sunxal ,we are sure that is the best choice you make in your
whole life ,Sunxal deserve to cooperate.:-)
I am Miranda ,sales manager in Sunxal .Before we cooperate ,pls let us know the below
informations ,
1. Size (we customized the size you need ,do not have any size in stock )
2. Grade (different magnets have different power ,pull force etc, temperature etc ,that is
the grade,if you don’t know let us know the usage of your magnets ,we offer our best
suggestions)
3. Quantity (for small size below Diameter 10mm ,our MOQ 10,000pcs,more quantity
,the better price )
4. Coating (Nickel or Zinc,expory etc)
5. Magnetization direction (axially or diametrically)
Here are some information for you to know more about NdFeB Magnet .
Rare Earth Magnet
Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful
permanent magnets in the world. They are also referred to as NdFeB magnets, or NIB, because
they are composed mainly of Neodymium (Nd), Iron (Fe) and Boron (B). They are a relatively new
invention and have only recently become affordable for everyday use.
Strength of NdFeB Magnet
If you've never handled neodymium magnets before, you will be amazed at their strength.
Neodymium magnets are over 10x stronger than the strongest ceramic magnets. If you are
currently using ceramic magnets in your project, you could probably use a much smaller
neodymium magnet and have greater holding force. You can get an idea of the relative strength
of each of our magnets on our Magnet Summary Page. The surface field of each of our stock
Email: miranda@sunxal.com

2. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
magnets is also listed on that same page. We also offer an online magnet
calculator to help you estimate the pull force and field strength of magnets at any distance from
the magnet.The potential uses for strong neodymium magnets are unlimited!
Grades of Neodymium
N35, N38, N42, N38SH...what does it all mean? Neodymium magnets are all graded by the
material they are made of. As a very general rule, the higher the grade (the number following the
'N'), the stronger the magnet. The highest grade of neodymium magnet currently available is N52.
Any letter following the grade refers to the temperature rating of the magnet. If there are no letters
following the grade, then the magnet is standard temperature neodymium. The temperature
ratings are standard (no designation) - M - H - SH - UH - EH.
Code Remanence Br Coercivity Force Intrinsic
Coercivity
Maximum
Energy
Curie Maximum
Operating
Force Product Bhm Temperature Temperature
Br bHc iHc (BH)max TC TW
T KGs KA/m KOe KA/m KOe KJ/m3
MGOe °C °C
Sintered
N-30 1.08-1.1510.8-11.5 780-836 9.8-10.5 >=955 >=12 220-240 28-31 310 80-100
N-33 1.13-1.1711.3-11.7 795-880 10.0-11.1 >=955 >=12 245-260 31-33 310 80-100
N-35 1.18-1.2211.8-12.2 875-915 11.0-11.5 >=955 >=12 260-285 33-36 310 80-100
N-38 1.22-1.2612.2-12.6 860-915 10.8-11.5 >=955 >=12 285-303 36-38 310 80-100
N-40 1.26-1.2912.6-12.9 836-876 10.5-11.0 >=955 >=12 303-318 38-40 310 80-100
N-42 1.29-1.3312.9-13.3 836-876 10.5-11.5 >=955 >=12 318-342 40-42 310 80-100
N-45 1.33-1.3713.3-13.7 836-876 10.5-11.0 >=955 >=12 342-358 42-45 310 80-100
N-48 1.37-1.4313.7-14.3916-111411.5-14.0 >=955 >=12 358-364 46-49 310 80-100
N-27H 1.02-1.1010.2-11.0 765-835 9.6-10.5 >=1353 >=17 195-220 25-28 340 120
N-30H 1.08-1.1510.8-11.5 810-850 10.2-10.7>=1353 >=17 220-245 28-31 340 120
N-33H 1.14-1.1711.4-11.7 820-876 10.3-11.0>=1353 >=17 247-263 31-33 340 120
N-35H 1.17-1.2111.7-12.1 860-915 10.8-11.5>=1353 >=17 263-279 33-35 340 120
N-38H 1.22-1.2612.2-12.6 915-955 11.5-12.0>=1353 >=17 287-303 36-38 340 120
N-40H 1.26-1.2912.6-12.9 915-955 11.5-12.0>=1353 >=17 303-318 38-40 340 120
N-27SH1.02-1.1010.2-11.0 765-835 9.6-10.5 >=1595 >=20 195-220 25-28 350 150
N-30SH1.08-1.1210.8-11.2 812-852 10.2-10.7>=1595 >=20 216-246 27-30 350 150
N-33SH1.14-1.1711.4-11.7 740-876 10.3-11.0>=1595 >=20 247-263 31-33 350 150
N-35SH1.17-1.2111.7-12.1 860-915 10.8-11.0>=1595 >=20 263-279 33-35 350 150
N-25UH0.98-1.02 9.8-10.2 732-764 9.2-9.6 >=1990 >=25 183-199 23-25 350 180
N-28UH1.04-1.0810.4-10.8 780-812 9.8-10.8 >=1990 >=25 183-223 23-25 350 180
N-30UH1.08-1.1210.8-11.2 804-844 10.1-10.6>=1990 >=25 223-239 28-30 350 180
N-33UH1.14-1.1711.4-11.7 740-876 10.3-11.0>=1990 >=25 247-263 31-33 350 180
N-25EH0.98-1.02 9.8-10.2 732-764 9.2-9.6 >=2387 >=30 183-199 23-25 350 200
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3. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
N-28EH1.04-1.0810.4-10.8 780-812 9.8-10.2 >=2387 >=30 207-223 26-28 350
200
Platings/Coatings
Neodymium magnets are a composition of mostly Neodymium, Iron and Boron. If left exposed to
the elements, the iron in the magnet will rust. To protect the magnet from corrosion and to
strengthen the brittle magnet material, it is usually preferable for the magnet to be coated. There
are a variety of options for coatings, but nickel is the most common and usually preferred. Our
nickel plated magnets are actually triple plated with layers of nickel, copper, and nickel again. This
triple coating makes our magnets much more durable than the more common single nickel plated
magnets. Some other options for coating are zinc, tin, copper, epoxy, silver and gold. Our gold
plated magnets are actually quadruple plated with nickel, copper, nickel and a top coating of gold.
Demagnetization
Rare Earth magnets have a high resistance to demagnetization, unlike most other types of
magnets. They will not lose their magnetization around other magnets or if dropped. They will
however, begin to lose strength if they are heated above their maximum operating temperature,
which is 176°F (80°C) for standard N grades. They will completely lose their magnetization if
heated above their Curie temperature, which is 590°F (310°C) for standard N grades. Some of
our magnets are of high temperature material, which can withstand higher temperatures without
losing strength.
Machining
Neodymium material is brittle and prone to chipping and cracking, so it does not machine well by
conventional methods. Machining the magnets will generate heat, which if not carefully controlled,
can demagnetize the magnet or even ignite the material which is toxic when burned. It is
recommended that magnets not be machined.
Direction of Magnetization of magnets
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4. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
Block magnets
Ring
Ar
c
Email: miranda@sunxal.com

5. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
Packing
Use Iron sheet or Bubble to make magnetic separation for air
shipping ,that’s general packing ,of course depends on your requirements
Email: miranda@sunxal.com

6. Ningbo Sunxal Magnetics Co.,Ltd Tel: +86-574 82816375 Fax: +86 574 82823911
Packing
Use Iron sheet or Bubble to make magnetic separation for air
shipping ,that’s general packing ,of course depends on your requirements
Email: miranda@sunxal.com