METAL ALLOY MAGNETS MMA
INTRODUCTION
Metal alloy magnets are normally cast in a foundry process, but are sometimes sintered. There are many magnet alloys comprising different proportions of aluminium, nickel and cobalt which create different magnetic characteristics. ALNICO V is the most widely used high quality magnet alloy. Metal alloy magnets have high working temperatures in the region of 450 degrees Celsius and they are mechanically stronger than any other magnet material. Metal alloy magnets are normally anisotropic, being magnetized through the longest dimension "L" and as a result they have a "long throw" of magnetic field making them ideal for use with remote reed switches and hall effect sensors for proximity indication and switching. There are a variety of finishes available for metal alloy magnets with as-cast finish being the cheapest which is normally acceptable for industrial use. Ground execution is an option where finer dimensional tolerances are required and so-called laboratory magnets normally have a painted finish. Bar and rod shapes are used extensively.
ROUND BAR/ROD
Size = Diameter (D) x Length (L) mm
Magnetized L
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3 x 25 |
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4 x 30 |
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5 x 30 |
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6 x 6 |
6 x 12 |
6 x 20 |
6 x 25 |
6 x 50 |
6 x 80 |
6.3 x 25 |
*6.55x20 |
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8 x 25 |
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10 x 15 |
10 x 30 |
10 x 60 |
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12.5 x 9 |
12.7x30 |
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* with ground end
Special hollow rod OD 20 x ID 8 x L 22
RECTANGULAR BAR
Size = Length (L) x Width (W) x Thickness (T) mm
Magnetized L
| 20 x 10 x 5 |
| 50 x 15 x 10 |
| 75 x 15 x 10 |
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100 x 15 x 10 |
BUTTON
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Model |
Height |
Diameter |
Core Hole |
Between Poles |
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T821 |
9.5 |
12.5 |
4.5 |
4 / 7.2 |
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T822 |
12.5 |
20 |
5 |
5.5 / 9 |
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T823 |
16 |
25 |
5 |
5.5 / 9 |
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T824 |
25 |
32.5 |
7 |
8 / 13 |
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T825 |
19.1 |
22.2 |
4.8 |
6.4/6.4 |
Supplied with keeper plate
SHALLOW POT
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Model |
Diameter |
Height |
Core Diameter |
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826 |
19 |
7.75 |
3.5 / 6.7 |
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827 |
28.5 |
8.75 |
4.75 / 8.6 |
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828 |
38 |
10.5 |
4.75 / 8.6 |
North pole in centre, south pole on periphery
Supplied with keeper plate
DEEP POT
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Model |
Diameter |
Height |
Threaded Entry |
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831 |
17.5 |
16 |
M6 |
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832 |
20.5 |
19 |
M6 |
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833 |
27 |
25 |
M6 |
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834 |
35 |
30 |
M6 |
North pole in centre, south pole on periphery
Body is mild steel
Supplied with keeper plate
MAGNETIC HOLDFAST
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Model |
Diameter |
Height |
Fix Holes |
Centres |
Pull/Kg |
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939 |
45 |
45 |
2 |
32 |
18 |
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940 |
55 |
50 |
2 |
38 |
27 |
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941 |
70 |
65 |
2 |
50 |
65 |
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942 |
100 |
75 |
3 |
69 |
145 |
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938 |
Cube 95 |
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4 |
57 |
190 |
North pole in centre, south pole on periphery
Body is mild steel
Central jack-off screw
Supplied with keeper plate
POWER HORSESHOE 
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Model |
Height |
Width |
Thick |
Between Poles |
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Minor |
11 |
22 |
8 |
6.4 |
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811 |
25 |
30 |
20 |
15 |
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812 |
25 |
40 |
25 |
20 |
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813 |
30 |
45 |
30 |
23 |
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814 |
35 |
57 |
44.5 |
35 |
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815 |
41 |
70 |
57 |
41 |
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816 |
54 |
79 |
82.5 |
47.6 |
North pole on one leg, south pole on other leg
Single mounting core hole on bridge between pole legs (except Minor)
Supplied with keeper plate
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