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Contact Us
Bunting® Magnetics Co.
500 S. Spencer Ave.
P.O. Box 468
Newton, Kansas 67114-0468
U.S.A.
Fax (316) 283-4975
bmc@buntingmagnetics.com Call us at (800) 835-2526

Standard Terms & Conditions

In Stock – Rare Earth, Alnico, Ceramic Magnets, and More
Bunting® Magnetics Co. offers you one of the largest selections of in-stock permanent magnets available. In addition, we’re glad to share our knowledge in the field of applied magnets to help you specify non-standard magnets to meet special needs. We can cut magnets to your specifications from Rare Earth, Alnico, and Ceramic.

You’ll find hundreds of shapes and sizes ready for immediate shipment when you call. In fact, you can expect shipment on most of the standard magnets listed in this catalog within 24 hours. For custom orders, virtually any configuration and quantity you need can be prepared and sent to you from our centrally located Chicago stocking facility.

Bunting® Stock Magnets Meet MMPA Standards, ROHS
Our stock magnets meet or exceed Magnetic Materials Producers Association Standards for physical quality and magnetic properties. All permanent magnet products are ROHS compliant.

Stock Permanent Magnet Specifications Comparison Table
Use this table to evaluate and compare the magnetic properties and other specifications of the materials from which our standard, in-stock magnets are manufactured.

  ALNICO CERAMIC NEODYMIUM SAMARIUM COBALT
SINTERED CAST
GRADE 2 8H 2 5 8B 8HE 1 5 8 30 35SH 35 38 40 45 50 18 22 26
MAGNETIC CHARACTERISTICS          
MAX. ENERGY PRODUCT
(Bd Hd) MAX. (MGO)
1.5 5.25 5.4 5.5 5.5 6 1 3.4 3.5 30 34 34 38 40 45 50 18 22 26
RESIDUAL INDUCTION Br. GAUSS 7100 7250 7500 12700 8300 9000 2200 3800 3850 11400 11900 12150 12500 12900 13800 14300 8900 9500 10400
COERCIVE FORCE Hc-OERSTEDS 550 1975 580 640 1650 1600 1825 2400 2950 10400 11000 11050 11800 12300 10500 11500 8600 9200 9500
INTRINSIC COERCIVE FORCE Hci-OERSTEDS 575 2125 600 645 1860 1620 6250 2420 3250 13500 >17000 13500 >12000 >14000 >11000 >11000 >20000 >20000 20000
SATURATION MAGNETIZING FORCE Hs-OERSTEDS 2000 6000 2000 3000 6000 6000 10000 10000 10000 30000 30000 30000 30000 30000 30000 30000 40000 40000 55000
RECOIL PERMEABILITY 6.4 3.2 2.6 2.1 2.0 3 1.15 1.05 1.07 1.05 1.05 1.05 1.08 1.08 1.05 1.05 1.05 1.05 1.05
MAGNETIC ORIENTATION (ANISOTROPIC) YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES YES
MATERIAL CHARACTERISTICS          
DENSITY - LB./IN.³ .243 .254 .263 .265 .262 .265 .175 .177 .177 .268 .275 .268 .268 .269 .268 .268 .304 .304 .297
CURIE TEMP.-F° 1544 1562 1472 1544 1580 1580 842 842 842 625 648 625 635 635 600 600 1380 1380 1515
MAX. PRACTICAL OPERATING TEMPERATURE-F° 1000 1000 932 1000 1000 1000 480 480 480 180 300 180 180 180 180 180 575 575 575
REVERSIBLE TEMP. COEF OF BR %/F° .011 .006 .020 .011 .006 .006 .105 .105 .105 .066 .052 .066 .066 .061 .061 .061 .022 .022 .019
HARDNESS-ROCKWELL Rc43 Rc44 Rc50 Rc50 Rc56 Rc58 --- --- --- Rc55 Rc58 Rc55 Rc55 Rc58 Rc58 Rc58 Ro53 Ro53 Ro56
UNSPECIFIED TOLERANCES          
UNFINISHED SURFACES (+/-)          
0 - .125 .005 .005 .015 .015 .031 .031 * * * + + + + + + + + + +
.125 - .625 .010 .010 .015 .015 .031 .031 * * * + + + + + + + + + +
.625 - 1.00 .015 .015 .015 .015 .031 .031 * * * + + + + + + + + + +
1.00 - 3.00 --- --- --- .015 .031 .061 * * * + + + + + + + + + +
3.00 - 5.00 --- --- --- .015 .047 .047 --- * * --- --- ---         --- --- ---
5.00 - 7.00 --- --- --- .015 .062 .062 --- * * --- --- --- --- ---     --- --- ---
7.00 - 9.00 --- --- --- .015 .078 .078 --- * * --- --- --- --- ---     --- --- ---
9.00 - 12.00 --- --- --- --- .094 .094 --- * * --- --- --- --- ---     --- --- ---
GROUND SURFACES (+) .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005 .005
CONCENTRICITY (TIR.)          
0 - .500 .005 .005 .048 .048 .048 .048 .020 .020 .020 .010 --- .010 --- --- .010 .010 --- --- ---
.500 - 1.00 .010 .010 .048 .048 .048 .048 .030 .030 .030 .020 --- .020 --- --- .020 .020 --- --- ---
1.00 - 1.50 .015 .015 .093 .093 .093 .093 3% 3% 3% --- --- --- --- --- .030 .030 --- --- ---
1.50 - 3.00 --- --- .093 .093 .093 .093 3% 3% 3% --- --- --- --- ---     --- --- ---
CUT SURFACES (+/-)          
0 - 3.00 .015 .015 --- .015 .015 .015 .015 .015 .015 .005 .005 .005 .005 .005 .005 .005 .015 .015 .015
3.00 - 6.00 --- --- --- .015 .015 .015 --- .015 .015 --- --- --- --- ---     --- --- ---
6.00 - 12.00 --- --- --- .015 --- --- --- .015 .015 --- --- --- --- ---     --- --- ---
* Unfinished surfaces tolerances for Ceramic magnets are +/- 0.015 or 2%, whichever is greater.
+ Unfinished surfaces tolerances for Neodymium magnets are +/- 0.005
For "Stock Permanent Magnetic Specifications Comparison Chart" click HERE
 
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