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Rare Earth Magnets

by nbalcom — last modified 2007-09-26 12:07

Rare Earth magnet materials are “high-energy” magnets offering 8 to 10 times the magnetic force of conventional ceramic magnet material, and 3 to 5 times that of Alnico magnetic materials. The increased magnetic force allows magnetic work holding and material handling systems to use a much smaller amount of magnet material, allowing for smaller systems, increased magnetic force, as well as cost benefits.

Rare Earth permanent magnet material is currently available in two alloy forms–Neodymium-Iron-Boron (NeFeB) and Samarium-Cobalt (SmCo) The physical properties of both alloys allow for greater magnetic field strengths and stronger holding forces at the magnet's surface than ceramic ferrite or alnico alloys. Basic differences between Neodymium-Iron-Boron and Samarium-Cobalt alloys are found in their composition, density, maximum energy output, and operating temperature range.

Rare Earth Neodymium single pole magnet housed in an aluminum insulated cup. Powerful compact magnets that can be press fit or use the tapped hole for mounting. +/- .003" diameter & .015" length. Maximum temperature range is Fahrenheit 200 F (94C).

Part #	Diameter+/-.003	Length +/-.015	Holding Force in lbs*	Tap Size	Tap Depth
IMN250T	0.250	1/2"	0.25	6-32	1/4"
IMN375T	0.375	1/2"	1.3	8-32	1/4"
IMN500T	0.500	1/2"	2.5	10-24	1/4"
IMN625T	0.625	1/2"	4.5	10-24	1/4"
IMN750T	0.750	1/2"	6	10-24	1/4"
IMN1000T	1.000	1/2"	7.5	10-24	1/4"
* Holding forces stated are shown at 50% of the actual tested value.

3 Pole Bottom Tap

Rare Earth Magnets

Rare Earth 3-pole magnet housed in an aluminum insulated cup. Extended poles can be lightly machined. Can be press fit or use bottom tapped hole for mounting. +/- .003" diameter & .015" length. Maximum temperature is 300 Fahrenheit (148C).

Part #	Diameter+/-.003	Length +/-.015	Holding force in lbs*	Tap size	Tap Depth
IMN3T1002	1.000	3/4"	15.5	1/4-20	1/4"
IMN3T1252	1.250	3/4"	26	5/16-18	1/4"
* Holding forces stated are shown at 50% of the actual tested value

4 Pole Single Thru Hole

Rare Earth Magnets

Rare Earth Neodymium 4-pole magnet housed in an aluminum insulated cup. Extended poles can be lightly machined. Can be press fit or use thru-hole for mounting purposes. +/- .008" diameter & +/- .015" length. Maximum temperature 200 Fahrenheit (94C).

Part #	Diameter +/-.008	Length +/-.015	Holding force in lbs*	Mounting Hole thru
IMC4H2000	2"	1 /2"	12	1/4" flat head
IMC4H2002	2"	3 /4"	35	1/4" flat head
IMC4H2004	2"	1"	65	1/4" flat head
IMC4H2504	2 1/2"	1"	80	1/4" flat head
* Holding forces stated are shown at 50% of the actual tested value

3 Pole Dual Thru Hole

Rare Earth Magnets

Rare Earth Neodymium 3-pole magnet housed in an aluminum insulated cup. Maximum strength in a wide but compact package. Can be press fit or use the 2 thru-holes for mounting. +/- .008" dia. & +/- .015" length. Maximum temperature is 200 Fahrenheit (94C).

Part #	Diameter +/-.008	Length +/-.015	Holding force in lbs*	Mounting Hole thru
IMC5H3004	3"	1"	120	two-1/4" flat head
* Holding forces stated are shown at 50% of the actual tested value

Island 2 Pole

Rare Earth Magnets

Rare Earth Neodymium Island 2-pole magnet housed in a steel cup. Ideal for shallow fixture applications. Additional insulation is needed for press fit applications. Use tapped hole for mounting. +/- .005" dia. & +/- .015" length. Maximum temperature is 200 Fahrenheit (94C).

Part #	Diameter +/-.005	Length +/-.015	Tap Size	Tap Depth	Holding force in lbs*
IMR375	3/8"	1/2"	8-32	0.085	3
IMR500	1/2"	1/2"	10-32	0.150	8
IMR750	3/4"	1/2"	10-32	0.150	22
IMR1000	1"	1/2"	1/4-20	0.150	46
IMR1250	1 1/4"	1/2"	5/16-18	0.150	68
* Holding forces stated are shown at 50% of the actual tested value

Parallel 2 Pole

Rare Earth Magnets

Rare Earth Neodymium parallel 2-Pole magnet housed in an aluminum insulated cup. Flush face magnet, they can be press fit or use bottom tapped hole for mounting. +/- .008" diameter & +/- .015" length. Maximum temperature is 200 Fahrenheit (94C). Custom versions available for sufficient quantities.

Part #	Diameter +/-.008	Length +/-.015	Tap Size	Tap Depth	Holding force in lbs*
IMN500	1/2"	1/2"	press fit only	n/a	6
IMNT750	3/4"	1 3/16"	1/4-20	1/4"	18
IMNT1000	1"	1 5/16"	1/4-20	5/16"	43
IMNT1500	1 1/2"	2 1/16"	5/16-18	5/16"	102
IMNT2000	2"	2 7/16"	3/8-16	5/16"	172
Metric					Converted to lbs*
IMPFO6N	6mm	20mm	press fit only	n/a	0.9
IMPF10N	10mm	20mm	press fit only	n/a	4.4
IMPF13N	13mm	20mm	press fit only	n/a	6.6
IMPF16N	16mm	20mm	press fit only	n/a	13.8
IMPF20N	20mm	25mm	press fit only	n/a	25.4
IMPF25N	25mm	30mm	press fit only	n/a	44
IMPF32N	32mm	40mm	press fit only	n/a	66
* Holding forces stated are shown at 50% of the actual tested value

Parallel 2 Pole Samarium Cobalt

Rare Earth Magnets

Rare Earth Samarium Cobalt (SmCo) parallel 2-pole magnet housed in aluminum insulated cup. This is the ideal magnetic solution for those high heat applications. Metric press fit mounting. +/- .002 diameter & length. Maximum temperature is 392 Fahrenheit (200C).

Part #	Diameter +/-.008	Length +/-.015	Holding force in lbs*
IMPFO6S	6mm	20mm	0.9
IMPF10S	10mm	20mm	4.4
IMPF13S	13mm	20mm	6.6
IMPF16S	16mm	20mm	13.8
IMPF20S	20mm	25mm	25.4
IMPF25S	25mm	30mm	44
IMPF32S	32mm	40mm	66
* Holding forces stated are shown at 50% of the actual tested value

Brass Shielded

Rare Earth Magnets

Rare Earth Neodymium magnet material shielded in a brass sleeve, 1-pole on each end. Insulating shield prevents a loss of magnetic flux when inserted into steel components or fixtures. Close o.d. tolerance for press fit applications. +/- .001 diameter & +/- .005" length. Maximum temperature is 200 Fahrenheit (94C).

Part #	Diameter +/-.001	Length +/-.005	Jacket Thickness	Holding force in lbs*
IMRBS1225	1/8"	1/4"	0.02	0.10
IMRBS1825	3/16"	1/4"	0.032	0.27
IMRBS2525	1/4"	1/4"	0.032	0.65
IMRBS2550	1/4"	1/2"	0.032	0.75
IMRBS3125	5/16"	1/4"	0.032	1
IMRBS3737	3/8"	3/8"	0.032	2.5
IMRBS4325	7/16"	1/4"	0.032	2.15
IMRBS4350	7/16"	1/2"	0.032	3.50
IMRBS5025	1/2"	1/4"	0.062	2.15
IMRBS5050	1/2"	1/2"	0.062	3.50
IMRBS7537	3/4"	3/8"	0.062	6.50
* Holding forces stated are shown at 50% of the actual tested value

Monroe PMP -

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