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Hard ferrite magnets

anisotropic (SrFe, hard ferrite in accordance with DIN 17 410)
Ferrite magnets made of 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.
PRODUCT DESCRIPTION

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.

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

Circular disc magnets
TypeD ØxL (a)  
R44,0x5,0 H, D ground
R55,0x2,6 H ground
R88,0x4,0 H ground
R1010,0x5,0  
R1110,0x10,0  
R1212,0x6,0  
R3030,0x6,0  
R4040,0x7,0 H ground
R4545,0x9,0 H ground
Disc with central hole
TypeD Øxd ØxH Senkung d Ø
RL1515,2x3,2x6,0 one side 90°
RL2020,0x4,3x6,5 both sides 90°
RL2120,0x4,3x10,0 both sides 90°
RL3031,0x5,3x15,0 one side 90°
Ring magnets
TypeD Øxd ØxH Senkung d Ø
RL88,0x4,0x3,0  
RL6215,0x6,2x3,0  
RL1919,0x6,5x10,0 H ground
RL1020,0x10,0x4,3 H ground
RL1630,0x16,0x5,0 H ground
RL3636,0x27,5x8,0 ID countersunk one side
RL4040,0x22,0x9,0  
RL6060,0x32,0x10,0  
RL107100,0x70,0x20,0 H ground
Block magnets
TypeLxBxH  
R121212,0x12,0x7,5 H ground
R251025,0x10,0x5,0  
R402040,0x20,0x10,0  
R502550,0x25,0x7,8 H ground
R602060,0x20,0x15,0  
R755075,0x50,0x20,0 H ground
R1000100,0x100,0x25,0 H ground
centre hole 14 mm
Magnetic values Energy
product
(BxH)max
Remanence

Br
Coercivity
(T=20°C)
Relative
remanent
permeability
Temperature
coefficient
of remanence
pro °C
Maximum
operating
temperature
Density Curie
tempe-
rature
      BHC JHC          
  kJ

m3
MGOe mT G kA

m
Oe kA

m
Oe mT

kA/m
  °C g

cm3
°C
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°5,0450°
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  
 16  R4   0.45  0.40  0.35  0.30  0.25  0.18    Add to shopping cart   
 16  R5   0.45  0.40  0.35  0.30  0.25  0.18    Add to shopping cart   
 16  R8   0.60  0.50  0.40  0.35  0.26  0.19    Add to shopping cart   
 16  R10   0.70  0.60  0.50  0.40  0.28  0.21    Add to shopping cart   
 16  R11   0.85  0.75  0.65  0.50  0.45  0.39    Add to shopping cart   
 16  R12   0.85  0.75  0.65  0.50  0.45  0.39    Add to shopping cart   
 16  R30   0.95  0.85  0.75  0.55  0.50  0.42    Add to shopping cart   
 16  R40   1.05  0.95  0.85  0.60  0.55  0.47    Add to shopping cart   
 16  R45   1.25  1.10  0.95  0.65  0.60  A    Add to shopping cart   
 16  RL15   0.90  0.80  0.78  0.62  0.57  0.45    Add to shopping cart   
 16  RL20   0.95  0.85  0.79  0.64  0.58  0.46    Add to shopping cart   
 16  RL21   0.98  0.88  0.83  0.76  0.69  0.58    Add to shopping cart   
 16  RL30   1.65  1.55  1.42  1.34  1.25  0.98    Add to shopping cart   
 16  RL8   0.45  0.40  0.35  0.30  0.25  0.19    Add to shopping cart   
 16  RL62   0.60  0.50  0.40  0.35  0.27  0.20    Add to shopping cart   
 16  RL19   0.95  0.85  0.75  0.55  0.50  0.42    Add to shopping cart   
 16  RL10   0.85  0.75  0.65  0.50  0.45  0.38    Add to shopping cart   
 16  RL16   0.85  0.75  0.65  0.50  0.45  0.38    Add to shopping cart   
 16  RL36   1.90  1.80  1.65  1.45  1.25  1.05    Add to shopping cart   
 16  RL40   2.00  1.90  1.70  1.55  1.30  1.07    Add to shopping cart   
 16  RL60   4.80  4.50  3.90  3.50  2.90  2.50    Add to shopping cart   
 16  RL107   16.00  11.00  10.00  6.50  5.90  A    Add to shopping cart   
 16  R1212   0.85  0.75  0.65  0.50  0.45  0.39    Add to shopping cart   
 16  R2510   0.95  0.85  0.75  0.55  0.50  0.42    Add to shopping cart   
 16  R4020   0.98  0.88  0.78  0.58  0.53  0.44    Add to shopping cart   
 16  R5025   2.50  2.30  2.10  1.90  1.50  0.90    Add to shopping cart   
 16  R6020   3.50  3.30  3.10  2.90  2.50  1.90    Add to shopping cart   
 16  R7550   14.00  9.00  8.00  6.00  4.80  3.10    Add to shopping cart   
 16  R1000   40.00  27.00  24.00  19.00  A  A    Add to shopping cart   
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.