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You are here: Home → Magnets → Alnico Magnet Assemblies
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Alnico Magnet Assemblies

by Tony Losey — last modified 2008-06-11 10:53
Alnico magnets exhibit high residual inductions, are the best choice for high temperature applications, and have relatively high energy characteristics. They are made primarily from alloys of Aluminum, Nickel, and Cobalt, (thus the reason they are called Alnico) and may be either cast or sintered. Cast Alnico can be made into intricate shapes that may not be feasible using other types of magnetic materials.


Island 2 Pole
ALNICO Magnets

Alnico Island 2-Pole magnet housed in a steel cup. Especially effective in mold applications. Can not be press fit without additional insulation. Use bottom tapped hole for mounting purposes. +/- .005" diameter & +/- .015" length. Maximum temperature is 800Fahrenheit (427C).
Part # Diameter +/-.005 Length +/-.015 Tap Size Tap Depth Holding Force in lbs*
IMA250 1/4" 1/2" 8-32 3/32" 0.13
IMA375 3/8" 1/2" 8-32 3/32" 0.72
IMA500 1/2" 1/2" 10-32 5/32" 1.13
IMA502 3/4" 10-32 3/16" 1.54
IMA504 1" 10-32 1/4" 1.75
IMA625 5/8" 1/2" 10-32 5/32" 1.19
IMA627 3/4" 10-32 7/32" 2.06
IMA629 1" 10-32 9/32" 2.44
IMA750 3/4" 1/2" 10-32 5/32" 2.69
IMA752 3/4" 10-32 1/4" 4.56
IMA754 1" 10-32 1/4" 4.69
IMA756 1 1/4" 10-32 1/4" 4.81
IMA1000 1" 1/2" 1/4-20 5/32" 4
IMA1002 3/4" 1/4-20 1/4" 5.5
IMA1004 1" 1/4-20 9/32" 7.25
IMA1254 1 1/4" 1" 1/4-20 1/4" 11
IMA1256 1 1/4"; 1/4-20 9/32" 12.5
* holding forces stated are shown at 50% of the actual tested value


Jacket Shielded
ALNICO Magnets

Alnico magnetic material shielded in a brass sleeve, 1-Pole on each end. Insulator sleeve prevents a loss of magnetic flux when inserted into steel components or fixtures. Press fit style only. +/-.001" diameter & +/- .005" length. Maximum temperature is 800 Fahrenheit (427C).
Part # Diameter +/-.001 Length +/-.005 Sidewall Thickness Holding Force in lbs*
IMABS1825 3/16" 1/4" 0.02 0.03
IMABS1850 3/16" 1/2" 0.02 0.04
IMABS2525 1/4" 1/4" 0.03 0.06
IMABS2550 1/4" 1/2" 0.03 0.14
IMABS3125 5/16" 1/4" 0.03 0.06
IMABS3150 5/16" 1/2" 0.03 0.18
IMABS3737 3/8" 3/8" 0.03 0.10
IMABS5050 1/2" 1/2" 0.03 0.23
IMABS7575 3/4" 3/4" 0.06 0.07
* holding forces stated are shown at 50% of the actual tested value


Multi-Pole
ALNICO Magnets

Alnico magnetic material shielded in a brass sleeve, 1-Pole on each end. Insulator sleeve prevents a loss of magnetic flux when inserted into steel components or fixtures. Press fit style only. +/-.001" diameter & +/- .005" length. Maximum temperature is 800 Fahrenheit (427C).
Part # Diameter +/-.006 Length +/-.015 Socket Head screw size # of poles Holding force in lbs*
IMAR1501 1-1/8" 25/32" 1/4-20 4 8
IMAR1502 1-3/8" 25/32" 1/4-20 6 12
IMAR1504 2-1/2" 9/32" 1/2-13 8 35
* holding forces stated are shown at 50% of the actual tested value