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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our proposal. Practically all "neodymium magnets" on our website are available for immediate delivery (check the list). See the magnet price list for more details check the magnet price list

Magnet for water searching F300 GOLD

Where to buy strong neodymium magnet? Magnet holders in airtight and durable steel casing are ideally suited for use in difficult, demanding climate conditions, including snow and rain see more...

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Holders with magnets can be applied to improve production, underwater discoveries, or finding meteors from gold see more...

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SM 18x275 [2xM5] / N42 - magnetic roller

magnetic separator

catalog number 130276

GTIN: 5906301812784

5.0

diameter Ø

18 mm [±0,1 mm]

height

275 mm [±0,1 mm]

max. temperature

≤ 80 °C

608.85 gross price (including VAT) / pcs +

495.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
495.00 ZŁ
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Specification: magnetic separator 18x275 [2xM5] / N42

Characteristics: magnetic separator 18x275 [2xM5] / N42
Properties
Values
catalog number
130276
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
18 mm [±0,1 mm]
height
275 mm [±0,1 mm]
max. temperature ?
≤ 80 °C
weight
0.01 g
execution tolerance
± 0.1 mm
rodzaj materiału
AISI 304 - bezpieczna dla żywności
rodzaj magnesów
NdFeB N42
ilość gwintów
2x [M5] wewnętrzne
biegunowość
obwodowa - 12 nabiegunników
indukcja magnetyczna
~ 5 400 Gauss [±5%]
max. temp. pracy
poniżej ≤ 80°C
grubość rury osłonowej
1 mm

Magnetic properties of the material N42

material characteristics N42
Properties
Values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.]
40-42
BH max MGOe
energy density [Min. - Max.]
318-334
BH max KJ/m
max. temperature
≤ 80
°C

Physical properties of sintered neodymium magnets Nd2Fe14B

Physical properties of sintered neodymium magnets Nd2Fe14B
Properties
Values
units
Vickers hardness
≥550
Hv
Density
≥7.4
g/cm3
Curie Temperature TC
312 - 380
°C
Curie Temperature TF
593 - 716
°F
Specific resistance
150
μΩ⋅Cm
Bending strength
250
Mpa
Compressive strength
1000~1100
Mpa
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
°C-1
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
°C-1
Young's modulus
1.7 x 104
kg/mm²
The device rod magnetic is based on the use of neodymium magnets, which are placed in a construction made of stainless steel usually AISI304. In this way, it is possible to effectively segregate ferromagnetic elements from other materials. An important element of its operation is the use of repulsion of magnetic poles N and S, which allows magnetic substances to be collected. The thickness of the magnet and its structure's pitch affect the power and range of the separator's operation.
Generally speaking, magnetic separators serve to extract ferromagnetic particles. If the cans are ferromagnetic, the separator will effectively segregate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the magnetic separator will not be effective.
Yes, magnetic rollers are used in food production to remove metallic contaminants, such as iron fragments or iron dust. Our rods are made from acid-resistant steel, EN 1.4301, suitable for contact with food.
Magnetic rollers, often called cylindrical magnets, are employed in food production, metal separation as well as recycling. They help in removing iron dust during the process of separating metals from other wastes.
Our magnetic rollers are composed of neodymium magnets placed in a stainless steel tube cylinder made of stainless steel with a wall thickness of 1mm.
From both sides of the magnetic bar can be with M8 threaded openings, which enables simple mounting in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of features, magnetic bars stand out in terms of magnetic force lines, flux density and the field of the magnetic field. We produce them in two materials, N42 as well as N52.
Often it is believed that the greater the magnet's power, the more efficient it is. Nevertheless, the value of the magnet's power depends on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of use and specific needs. The standard operating temperature of a magnetic bar is 80°C.
If the magnet is thin, the magnetic force lines will be more compressed. On the other hand, when the magnet is thick, the force lines are extended and extend over a greater distance.
For constructing the casings of magnetic separators - rollers, most often stainless steel is utilized, particularly types AISI 304, AISI 316, and AISI 316L.
In a salt water contact, AISI 316 steel exhibits the best resistance thanks to its exceptional anti-corrosion properties.
Magnetic bars are characterized by their unique configuration of poles and their ability to attract magnetic particles directly onto their surface, as opposed to other devices that may utilize complex filtration systems.
Technical designations and terms related to magnetic separators comprise among others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.
Magnetic induction for a roller is determined using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value near the magnetic pole. The result is verified in a value table - the lowest is N30. All designations less than N27 or N25 suggest recycling that falls below the standard - they are not suitable.
Neodymium magnetic bars offer a range of benefits such as a very strong magnetic field, the ability to capture even the tiniest metal particles, and durability. However, some of the downsides may involve the requirement for frequent cleaning, greater weight, and potential installation difficulties.
To properly maintain of neodymium magnetic rollers, you should regularly cleaning them from deposits, avoiding extreme temperatures above 80 degrees, and shielding them from moisture if the threads are not sealed – in ours, they are. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can oxidize and lose their power. Magnetic field measurements should be carried out once every 24 months. Care should be taken, as there is a risk of finger injury. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could cause problems with the magnetic rod seal and product contamination. The range of the roller corresponds to its diameter: fi25mm gives an active range of about 25mm, while fi32 gives an active range of about 40mm.
Magnetic rollers are cylindrical neodymium magnets placed in a casing made of corrosion-resistant stainless steel, used for separating ferromagnetic contaminants from raw materials. They are used in the food industry, recycling, and plastic processing, where metal separation is crucial.

Find suggested articles

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to immense power, neodymium magnets have the following advantages:

  • They do not lose power over time - after approximately 10 years, their strength decreases by only ~1% (theoretically),
  • They protect against demagnetization caused by external magnetic field very well,
  • In other words, thanks to the shiny nickel, gold, or silver finish, the element gains an aesthetic appearance,
  • They exhibit extremely high magnetic induction on the surface of the magnet,
  • Magnetic neodymium magnets are characterized by hugely high magnetic induction on the surface of the magnet and can operate (depending on the form) even at temperatures of 230°C or higher...
  • The ability for precise shaping and customization to specific needs – neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of their possible uses.
  • Key role in advanced technologically fields – are used in hard drives, electric drive mechanisms, medical equipment and various technologically advanced devices.

Disadvantages of neodymium magnets:

  • They are fragile when subjected to a strong impact. If the magnets are exposed to impacts, we recommend using magnets in a protective case. The steel housing in the form of a holder protects the magnet from impacts, and at the same time increases its overall strength,
  • Magnets lose their power due to exposure to high temperatures. In most cases, when the temperature exceeds 80°C, these magnets experience permanent loss in strength (although it is worth noting that this is dependent on the shape and size of the magnet). To avoid this problem, we offer special magnets marked with the [AH] symbol, which exhibit high temperature resistance. They can operate even at temperatures as high as 230°C or more,
  • Magnets exposed to a humid environment can corrode. Therefore, when using them outdoors, we suggest using waterproof magnets made of rubber, plastic, or other moisture-resistant materials,
  • The use of a cover - a magnetic holder is recommended due to the limited production capabilities of creating threads or complex shapes in the magnet
  • Possible danger arising from small pieces of magnets pose a threat, in case of ingestion, which is particularly important in the context of children's health. Furthermore, miniscule components of these devices are able to complicate diagnosis when they are in the body.

Notes with Neodymium Magnets

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

  Magnets should not be treated as toys. Therefore, it is not recommended for youngest children to have access to them.

Not all neodymium magnets are toys, so do not let children play with them. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

Neodymium magnets are particularly delicate, which leads to shattering.

Neodymium magnets are fragile as well as will break if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal as well as coated with a shiny nickel plating, they are not as hard as steel. At the moment of connection between the magnets, tiny sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

You should maintain neodymium magnets at a safe distance from the wallet, computer, and TV.

Neodymium magnets produce intense magnetic fields that can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also destroy devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. Once crushed into fine powder or dust, this material becomes highly flammable.

It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.

Magnets attract each other within a distance of several to about 10 cm from each other. Don't put your fingers in the path of magnet attraction, as a serious injury may occur. Magnets, depending on their size, can even cut off a finger or alternatively there can be a serious pressure or even a fracture.

Do not bring neodymium magnets close to GPS and smartphones.

Magnetic fields can interfere with compasses and magnetometers used in aviation and maritime navigation, as well as internal compasses of smartphones and GPS devices. There are neodymium magnets in every smartphone, for example, in the microphone and speakers.

The magnet coating is made of nickel, so be cautious if you have an allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets are among the most powerful magnets on Earth. The astonishing force they generate between each other can shock you.

On our website, you can find information on how to use neodymium magnets. This will help you avoid injuries and prevent damage to the magnets.

Neodymium magnets can demagnetize at high temperatures.

While Neodymium magnets can lose their magnetic properties at high temperatures, it's important to note that the extent of this effect can vary based on factors such as the magnet's material, shape, and intended application.

So you are aware of why neodymium magnets are so dangerous, read the article titled How very dangerous are very strong neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98