| 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 |
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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
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For "Stock Permanent Magnetic Specifications Comparison
Chart" click HERE
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