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If you can't find what you require in our standard range on the website, kindly use the Enquiry Form to send us your wishes for custom manufacturing. |
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Hard ferrite magnetsanisotropic (BaFe, SrFe, hard ferrite in accordance with DIN 17 410)Ferrite magnets made of barium ferrite and strontium ferrite are compressed and then heat treated at a high temperature by sintering. They acquire their shape through a magnetic field during compression. As a result the powdered parts take on a geometric alignment in the later direction of magnetisation. Keeping in the preference direction (anisotropy) considerably improves the remanence. A magnetisation is only possible in the predetermined preference direction. The following standard magnets are magnetised in the preference direction designated by N-S.
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Ferrite magnets correspond to any ceramic material in terms of hardness and brittleness and can only be machined with diamond tools. As a ceramic material, hard ferrite magnets are resistant to weathering and to many chemicals such as solvents, alkaline solutions, salts, weak acids, lubricants and harmful gases. Hard ferrites are the most inexpensive and most widely used permanent magnets worldwide. A rise in temperature per 1 °C leads to a reduction in the flux density by 0.2% while the coercivity increases by 0.3% at the same time. A reduction in temperature increases the flux density and lowers the coercivity by the same amount. |
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The design of hard ferrite magnets always requires a large magnetic pole area with small thickness in the direction of magnetisation. The ratio between magnet length and magnet diameter for a magnetic disc can be estimated here. We supply all standard magnets magnetised in the given magnetisation direction.The following standard magnets are generally available at short notice from stock. Circular rod magnets with other dimensions in the diameter range from 3 to 20 mm are available for volume applications (Request form). All dimensions in mm. H = direction of magnetisation |
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 Circular disc magnets |  |
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| Type | D Ø | x | L (a) | | |
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| R4 | 4,0 | x | 5,0 | | H, D ground |
| R5 | 5,0 | x | 2,6 | | H ground |
| R8 | 8,0 | x | 4,0 | | H ground |
| R10 | 10,0 | x | 5,0 | | |
| R11 | 10,0 | x | 10,0 | | |
| R12 | 12,0 | x | 6,0 | | |
| R30 | 30,0 | x | 6,0 | | |
| R40 | 40,0 | x | 7,0 | | H ground |
| R45 | 45,0 | x | 9,0 | | H ground |
 Disc with central hole |  |
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| Type | D Ø | x | d Ø | x | H | | Senkung d Ø |
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| RL15 | 15,2 | x | 3,2 | x | 6,0 | | one side 90° |
| RL20 | 20,0 | x | 4,3 | x | 6,5 | | both sides 90° |
| RL21 | 20,0 | x | 4,3 | x | 10,0 | | both sides 90° |
| RL30 | 31,0 | x | 5,3 | x | 15,0 | | one side 90° |
Non-magnetic screws should be used for fixing! |
| Ring magnets |  |
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| Type | D Ø | x | d Ø | x | H | | Senkung d Ø |
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| RL8 | 8,0 | x | 4,0 | x | 3,0 | | |
| RL62 | 15,0 | x | 6,2 | x | 3,0 | | |
| RL19 | 19,0 | x | 6,5 | x | 10,0 | | H ground |
| RL10 | 20,0 | x | 10,0 | x | 4,3 | | H ground |
| RL16 | 30,0 | x | 16,0 | x | 5,0 | | H ground |
| RL36 | 36,0 | x | 27,5 | x | 8,0 | | ID countersunk one side |
| RL40 | 40,0 | x | 22,0 | x | 9,0 | | |
| RL60 | 60,0 | x | 32,0 | x | 10,0 | | |
| RL107 | 100,0 | x | 70,0 | x | 20,0 | | H ground |
| Block magnets |  |
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| Type | L | x | B | x | H | | |
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| R1212 | 12,0 | x | 12,0 | x | 7,5 | | H ground |
| R2510 | 25,0 | x | 10,0 | x | 5,0 | | |
| R4020 | 40,0 | x | 20,0 | x | 10,0 | | |
| R5025 | 50,0 | x | 25,0 | x | 7,8 | | H ground |
| R6020 | 60,0 | x | 20,0 | x | 15,0 | | |
| R7550 | 75,0 | x | 50,0 | x | 20,0 | | H ground |
| R1000 | 100,0 | x | 100,0 | x | 25,0 | | H ground
centre hole 14 mm |
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| Magnetic values | Energy
product
(BxH) max | Remanence
Br | Coercivity
(T=20°C) | Relative
remanent
permeability | Temperature
coefficent of
remanence
per °C | Temperature
for practical
use | Density | Curie
tempe-
rature |
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| BHC | JHC |
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kJ
m3 | MGOe | mT | G | kA
m | Oe | kA
m | Oe | mT
kA/m | °C | g
cm3 | °C |
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| Hartferrit (SrFe) | 27-
32 | 3,4-
4,0 | 380-
400 | 3800-
4000 | 230-
275 | 2891-
3457 | 235-
290 | 2954-
3645 | 1,45-
1,65 | - 0,20% | ca. 200° | 5,0 | 450° |
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Order list
Prices /pc. ex works Berlin plus packing, VAT only in Germany
(A = Please ask for price) |
Catalogue
page |
Type |
1 - 19 |
20 - 49 |
50 - 99 |
100 - 199 |
200 - 499 |
500 - 1000 |
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| 16 |
R4 |
0,45 |
0,40 |
0,35 |
0,30 |
0,25 |
0,18 |
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| 16 |
R5 |
0,45 |
0,40 |
0,35 |
0,30 |
0,25 |
0,18 |
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| 16 |
R8 |
0,60 |
0,50 |
0,40 |
0,35 |
0,26 |
0,19 |
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| 16 |
R10 |
0,70 |
0,60 |
0,50 |
0,40 |
0,28 |
0,21 |
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| 16 |
R11 |
0,85 |
0,75 |
0,65 |
0,50 |
0,45 |
0,39 |
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| 16 |
R12 |
0,85 |
0,75 |
0,65 |
0,50 |
0,45 |
0,39 |
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| 16 |
R30 |
0,95 |
0,85 |
0,75 |
0,55 |
0,50 |
0,42 |
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| 16 |
R40 |
1,05 |
0,95 |
0,85 |
0,60 |
0,55 |
0,47 |
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| 16 |
R45 |
1,25 |
1,10 |
0,95 |
0,65 |
0,60 |
0,52 |
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| 16 |
RL15 |
0,90 |
0,80 |
0,70 |
0,50 |
0,45 |
0,33 |
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| 16 |
RL20 |
0,95 |
0,85 |
0,75 |
0,55 |
0,50 |
0,37 |
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| 16 |
RL21 |
0,98 |
0,88 |
0,78 |
0,58 |
0,53 |
0,39 |
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| 16 |
RL30 |
1,50 |
1,40 |
1,30 |
1,10 |
1,00 |
0,77 |
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| 16 |
RL8 |
0,45 |
0,40 |
0,35 |
0,30 |
0,25 |
0,19 |
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| 16 |
RL62 |
0,60 |
0,50 |
0,40 |
0,35 |
0,27 |
0,20 |
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| 16 |
RL19 |
0,95 |
0,85 |
0,75 |
0,55 |
0,50 |
0,42 |
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| 16 |
RL10 |
0,85 |
0,75 |
0,65 |
0,50 |
0,45 |
0,38 |
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| 16 |
RL16 |
0,85 |
0,75 |
0,65 |
0,50 |
0,45 |
0,38 |
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| 16 |
RL36 |
1,90 |
1,80 |
1,65 |
1,45 |
1,25 |
1,05 |
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| 16 |
RL40 |
2,00 |
1,90 |
1,70 |
1,55 |
1,30 |
1,07 |
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| 16 |
RL60 |
4,80 |
4,50 |
3,90 |
3,50 |
2,90 |
2,50 |
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| 16 |
RL107 |
16,00 |
11,00 |
10,00 |
6,50 |
5,90 |
A |
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| 16 |
R1212 |
0,85 |
0,75 |
0,65 |
0,50 |
0,45 |
0,39 |
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| 16 |
R2510 |
0,95 |
0,85 |
0,75 |
0,55 |
0,50 |
0,42 |
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| 16 |
R4020 |
0,98 |
0,88 |
0,78 |
0,58 |
0,53 |
0,44 |
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| 16 |
R5025 |
2,50 |
2,30 |
2,10 |
1,90 |
1,50 |
0,90 |
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| 16 |
R6020 |
3,50 |
3,30 |
3,10 |
2,90 |
2,50 |
1,90 |
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| 16 |
R7550 |
14,00 |
9,00 |
8,00 |
6,00 |
4,80 |
3,10 |
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| 16 |
R1000 |
40,00 |
27,00 |
24,00 |
19,00 |
A |
A |
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Small orders: Payments from foreign countries result in additional bank charges, therefore we charge an additional lump sum of 15,- Euro for all foreign orders with a goods value less than 153,- Euro.
Please ask for our Conditions of sale, delivery and payment in english and our export conditions for your country. |
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Index 
Order list 
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