Rare earth magnets

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Forum topic by Knothead62 posted 12-03-2011 01:03 AM 2389 views 0 times favorited 14 replies Add to Favorites Watch
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2600 posts in 4013 days

12-03-2011 01:03 AM

Topic tags/keywords: question tip rust

I’m starting this as a need for specific information. I would like to make some flyboxes for fishing flies. Do RE magnets rust????? If not, I’m OK but if they do- back to the drawing board.

14 replies so far

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8415 posts in 4427 days

#1 posted 12-03-2011 10:39 PM

Regardless of rustability….rare earth magnets are the greatest invention since sliced bread IMHO! Fun to play with, powerful, small, cheap, and incredibly handy around the shop. Even just a sliver of a broken magnet is strong enough to hold things like arbor wrenches, DP keys, router wrenches, etc.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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Bill White

5349 posts in 5012 days

#2 posted 12-03-2011 10:50 PM

I even use ‘em to secure a slave table for my scroll saw. It lets me use more of the blades before they are trashed.

-- [email protected]

View Neight's profile


112 posts in 3445 days

#3 posted 12-03-2011 11:11 PM

They are great magnets, as cr1 said, they rust like mad if the chrome shell is cracked.
I have many of them in many sizes though, and if handled properly, the should be fine. I use them to make brushless electric motors with, and they occasionally dislodge themselves from the spinning rotor. They can take some abuse, the only way I have even cracked one is if they hit each other.
They have a powerful enough magnetic field though that you could easily enclose them in something waterproof, and still get them to work for what you need.

-- Work consists of whatever a body is OBLIGED to do, and Play consists of whatever a body is not obliged to do. -Mark Twain

View HorizontalMike's profile


7915 posts in 3966 days

#4 posted 12-04-2011 12:59 AM



-- HorizontalMike -- "Woodpeckers understand..."

View longgone's profile


5688 posts in 4360 days

#5 posted 12-04-2011 01:09 AM

You can buy 5/16” rare earth magnets at Harbor Freight for uner $2 for a pack of 10. Many uses…I use them to hold box lids and cabinet doors shut in addition to a ton of other uses.

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2600 posts in 4013 days

#6 posted 12-04-2011 03:05 AM

Rust or the possibility of rust eliminates it right off the bat. Thanks- I’ll keep this information for other projects.

View Dallas's profile


3599 posts in 3539 days

#7 posted 12-04-2011 03:33 AM

I jut had to file one down because the dummy that installed it as the closure in the box I, ummm, he just made installed it a bit proud so the lid wouldn’t close completely.
My method of keeping it from rusting was to cover it with 5 minute epoxy.

We shall see how this is going to work.

-- Improvise.... Adapt...... Overcome!

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1691 posts in 3676 days

#8 posted 12-05-2011 04:10 AM

enclose them in something…..anything impervious to water. You will be fine.

-- Made in America, with American made tools....Shopsmith

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2600 posts in 4013 days

#9 posted 12-05-2011 09:15 PM

jumbojack, et al., would the suggestions you give take a full immersion in water? The flybox would be made of wood, obviously. But…...if it were dropped in the water, would a coating of epoxy be enough? Thanks.

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18619 posts in 5212 days

#10 posted 12-05-2011 10:28 PM

that’s what I was going to suggest—imbedding them in something. But I can’t help you re: effectiveness.

(Mike: that’s the second time this week that I’ve seen something by “Rare Earth” )

-- ~ Debbie, Canada (, Young Living Wellness )

View SPalm's profile


5338 posts in 4934 days

#11 posted 12-05-2011 11:31 PM

Ummm. The RE magnets I have been getting do not rust. These have a nickel coating (there are also epoxy coated and uncoated ones out there). True you can chip this coating if you whack them around and play with them too much, but recessed into a hole, they are really rust free. I have been getting them from the web, not Harbor Freight or out of used disk drives (which are nice places to get them for cheap, but not for show).

This is from their website:

Nickel-Copper-Nickel triple layer coated for maximum rare earth magnets durability and excellent protection against corrosion

Nickel-Copper-Nickel triple layer coating vs. Epoxy Coating:

Epoxy single layer coating is THE LEAST durable coating from our experience.

Nickel + Copper + Nickel 3-layer coating is much more durable than Epoxy single layer coating because Epoxy single layer coating is thin and quicker to wear off, even a scratch can damage the coating easily.


-- -- I'm no rocket surgeon

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4615 posts in 4794 days

#12 posted 12-06-2011 12:29 AM

Another great souce of RE magnets that are coated is from old Hard Drives

Also they will definitely erase the magnetic stripe on credit cards…

-- “The two most important days in your life are the day you are born and the day you find out why.” Mark Twain

View jumbojack's profile


1691 posts in 3676 days

#13 posted 12-06-2011 02:06 AM

knothead. I would think that a countersunk RE in epoxy with epoxy over would protect them from any rust. The ones I get from ACE Hardware are nickle plated and very strong. I rarely use them in tandem. Usually I use a nail head for the magnet to attract to. They are so powerful that to pull them apart as in a lidded box is difficult.

-- Made in America, with American made tools....Shopsmith

View Knothead62's profile


2600 posts in 4013 days

#14 posted 12-06-2011 05:18 PM

jumbojack, good point- two magnets would be hard to separate.

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