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For a circular magnet with a radius of R and Length L, the field at the centerline of the magnet a distance X from the surface can be calculated by the following formula (where Br is the Residual Induction of the material):

Can a magnet that has lost its magnetism be re-magnetized?

Provided that the material has not been damaged by extreme heat, the magnet can be re-magnetized back to its original strength.

Can I make a magnet that I already have any stronger?

Once a magnet is fully magnetized, it cannot be made any stronger – it is “saturated.” In that sense, magnets are like buckets of water: once they are full, they can’t get any “fuller.”

How do you measure the strength or power of a magnet?

Most commonly, Gaussmeters, Magnetometers, or Pull-Testers are used to measure the strength of a magnet.

Gauss meters measure the strength in Gauss, Magnetometers measure in Gauss or arbitrary units (so it’s easy to compare one magnet to another), and Pull-Testers can measure pull in pounds, kilograms, or other force units.

Special Gaussmeters can cost several thousands of dollars.

We only sell the pull-test style magnetic tester, which is our pull-test kit.

If I have a neo magnet with a Br of 12,300 Gauss, should I be able to measure 12,300 Gauss on its surface?

No. The Br value is measured under closed circuit conditions.

A closed-circuit magnet is not of much use.

In practice, you will measure a field that is less than 12,300 Gauss close to the surface of the magnet.

The actual measurement will depend on whether the magnet has any steel attached to it, how far away from the surface you make the measurement, and the size of the magnet (assuming that the measurement is being made at room temperature).

For example, a 1” diameter Grade 35 Neo magnet that is 1/4“long, will measure approximately 2,500 Gauss 1/16” away from the surface, and 2,200 Gauss 1/8” away from the surface.

What are Magnetic Poles?

Magnetic Poles are the surfaces from which the invisible lines of magnetic flux emanate and connect on return to the magnet.

What are the standard industry definitions of "North" and "South" Pole?

The North Pole is defined as the pole of a magnet that, when free to rotate, seeks the North Pole of the earth.

In other words, the North Pole of a magnet seeks the North Pole of the earth.

Similarly, the South Pole of a magnet seeks the South Pole of the earth.

Can a particular pole be identified?

Yes, the North or South Pole of a magnet can be marked if specified.

It is relatively simple to identify the poles of a magnet.

First, the quickest method is to use another magnet that is already marked.

The North pole of the marked magnet will be attracted to the South pole of the unmarked magnet.

Second, it is possible to use an even number of magnets and pinch a string in the middle of the stack and dangle the magnets so they can freely rotate on the string.

The North pole of the magnets will settle pointing to the North.

This result contradicts the common theory that opposites attract when discussing the rules of magnetism.

However, the naming convention of the poles is a historical leftover from the time when the poles were called North-seeking or South-seeking poles.

Finally, you can use a compass to identify the poles.

The end of the needle that normally points North will be attracted to the South pole of the magnet.

We also stock a magnetic pole indicator device to quickly determine the polarity of the magnets ( PD251 ).

This magnetic pole tester provides an instant zero-delay magnetic pole indication.

Just press the push button to activate and the tester will indicate the appropriate magnetic pole via LED’s at once.”

How can you tell which is the North Pole if it is not marked?

You can’t tell by looking.

You can tell by placing a compass close to the magnet.

The end of the needle that normally points toward the North Pole of the Earth would point to the South Pole of the magnet.

What are the different types of magnets available?

There are 2 types of magnets: permanent magnets and electromagnets.

Permanent magnets emit a magnetic field without the need for any external source of power.

Electromagnets require electricity in order to behave as a magnet.

There are various different types of permanent magnet materials, each with their own unique characteristics.

Each different material has a family of grades that have properties slightly different from each other, though based on the same composition.

What are rare earth magnets?

Rare earth magnets are magnets that are made out of the rare earth group of elements.

The most common rare earth magnets are the neodymium-iron-boron and samarium cobalt types.

125 lb pull rare earth magnet Harbor Freight Tools

These neodymium magnets are more commonly called rare earth magnets and even though they are small, they pack quite a punch.

The easiest way to separate them is to slide each one off the others and not allow them to slam together.

Dimensions:

Small = .375" in diameter by .0625" in height (pull force of 2.2lbs)

Medium = .5" in diameter by .0625" in height (pull force of 3lbs.)

Large = .5" in diameter by .125" in height (pull force of 6.6lbs)

Please take care when working with these magnets and do not allow them to slam together since they may peel, crack or shatter.

Their strong magnetic fields can also possibly damage magnetic media such as credit cards, magnetic I.D.

cards, cassette tapes, floppy disks, and videotapes.

They can also damage televisions, VCRs, computers and CRT monitors and other electronics.

The small magnets are great to use in multiples in the same tin to give you more coverage as you try to get your tin to attached to a small nail or screw.

Two to three magnet sin the slider tins will give the most advantage of making sure your tin attaches to a smaller metallic surface such as a nail top or bolt.

Buy Direct From the Manufacturer

Our manufacturing facility is set up for the most efficient process- minimizing turnaround time and enabling us to meet your tightest deadlines.

We stock a wide range of rare earth magnets for all uses.

Select from neodymium or samarium permanent magnets- the most powerful magnetic materials available.

Ceramic, a corrosion-resistant material, is the most popular material choice for most applications.

Choose from a variety of shapes and sizes- around, square and bar, as small as a ¼ inch and as large as 6 inches, or request your custom requirements.

Alnico, composed of aluminum, nickel, and cobalt, is well known for its temperature stability and is very reliable in high-temperature applications.

Choose from cylindrical, bar, and disc-shaped options.

Our flexible strip and flexible sheet options allow you to choose from dozens of stock specifications or request a custom design for your unique application of flexible magnetic sheets or strips.

These are commonly used in displays and signage.

For more heavy-duty requirements, we stock electromagnets that can pull as much as 1100 lbs (and can custom manufacture for even greater strength).

Or for mounting and holding applications, you can select from a wide range of channel magnets, from tiny to large, to cover your range of uses.

Browse the Catalogue & Order Today

View our large inventory, including everything from large permanent magnets to tiny magnets, and order today for fast shipping.

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