tel: +48 888 99 98 98

neodymium magnets

We offer yellow color magnetic Nd2Fe14B - our offer. Practically all magnesy neodymowe in our store are in stock for immediate purchase (check the list). See the magnet price list for more details check the magnet price list

Magnets for water searching F400 GOLD

Where to buy strong magnet? Holders with magnets in solid and airtight steel casing are excellent for use in challenging climate conditions, including during rain and snow more information...

magnets with holders

Holders with magnets can be applied to facilitate manufacturing, underwater exploration, or locating meteorites made of metal check...

Enjoy shipping of your order on the same day before 2:00 PM on business days.

Dhit sp. z o.o. logo
Product available shipping in 4 days!

SM 25x225 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130292

GTIN: 5906301812852

no reviews

diameter Ø

25 mm [±0,1 mm]

height

225 mm [±0,1 mm]

max. temperature

≤ 80 °C

615.00 gross price (including VAT) / pcs +

500.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
500.00 ZŁ
615.00 ZŁ
price from 5 pcs
475.00 ZŁ
584.25 ZŁ
price from 9 pcs
450.00 ZŁ
553.50 ZŁ

Don't know what to buy?

Call us tel: +48 888 99 98 98 or contact us via contact form on our website. You can check the power as well as the appearance of magnet in our magnetic calculator force calculator

Orders placed by 2:00 PM will be shipped on the same business day.

Specification: magnetic separator 25x225 [2xM8] / N42

Characteristics: magnetic separator 25x225 [2xM8] / N42
Properties
Values
catalog number
130292
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
25 mm [±0,1 mm]
height
225 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 [M8] wewnętrzne
biegunowość
obwodowa - 8 nabiegunników
indukcja magnetyczna
~ 6 500 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 main mechanism of the magnetic separator is the use of neodymium magnets, which are placed in a construction made of stainless steel mostly AISI304. Due to this, it is possible to precisely segregate ferromagnetic elements from other materials. A key aspect of its operation is the use of repulsion of N and S poles of neodymium magnets, which causes magnetic substances to be collected. The thickness of the magnet and its structure's pitch affect the range and strength of the separator's operation.
Generally speaking, magnetic separators serve to separate ferromagnetic particles. If the cans are ferromagnetic, the separator will be able to separate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not be able to separate them.
Yes, magnetic rollers find application in food production for the elimination of metallic contaminants, for example iron fragments or iron dust. Our rods are constructed from acid-resistant steel, EN 1.4301, suitable for contact with food.
Magnetic rollers, otherwise cylindrical magnets, are used in food production, metal separation as well as waste processing. They help in removing iron dust during the process of separating metals from other wastes.
Our magnetic rollers are built with neodymium magnets embedded in a tube of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, enabling quick installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of magnetic properties, magnetic bars stand out in terms of flux density, magnetic force lines and the field of the magnetic field. We produce them in materials, N42 and N52.
Generally it is believed that the greater the magnet's power, the better. However, the effectiveness 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 anticipated needs. The standard operating temperature of a magnetic bar is 80°C.
If the magnet is more flat, the magnetic force lines are more compressed. By contrast, when the magnet is thick, the force lines are longer and extend over a greater distance.
For creating the casings of magnetic separators - rollers, frequently stainless steel is employed, particularly types AISI 304, AISI 316, and AISI 316L.
In a saltwater environment, type AISI 316 steel is recommended thanks to its excellent corrosion resistance.
Magnetic rollers stand out for their unique configuration of poles and their capability to attract magnetic substances directly onto their surface, as opposed to other separators that often use more complicated filtration systems.
Technical designations and terms related to magnetic separators include amongst others polarity, magnetic induction, magnet pitch, as well as the type of steel used.
Magnetic induction for a magnet on a roller is measured 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 below N27 or N25 suggest recycling that falls below the standard - they are not suitable.
Neodymium magnetic rollers offer a range of benefits such as excellent separation efficiency, strong magnetic field, and durability. However, some of the downsides may involve the need for regular cleaning, higher cost, and potential installation challenges.
For proper maintenance of neodymium magnetic rollers, you should cleaning after each use, avoiding temperatures up to 80°C. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can oxidize and weaken. Magnetic field measurements is recommended be carried out every two years. Care should be taken, as it’s possible of finger injury. If the protective tube is only 0.5 mm thick, it may wear out, which in turn could lead to 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.
A magnetic roller is a magnetic separator made from a neodymium magnet enclosed in a cylindrical stainless steel housing, which are used to remove metal contaminants from bulk and granular materials. They are applied in industries such as food processing, ceramics, and recycling, where the removal of iron metals and iron filings is essential.

Compilation of suggested goods

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their strength (of the magnet). After approximately 10 years, their power decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic sources,
  • In other words, thanks to the glossy nickel, gold, or silver finish, the element gains an aesthetic appearance,
  • They exhibit very high magnetic induction on the surface of the magnet,
  • Magnetic neodymium magnets are characterized by very high magnetic induction on the surface of the magnet and can operate (depending on the shape) even at temperatures of 230°C or higher...
  • Due to the option of accurate forming and adaptation to individual needs – neodymium magnets can be produced in various forms and dimensions, which enhances their versatility in applications.
  • Wide application in modern technologies – are used in computer drives, electric motors, medical equipment and various technologically advanced devices.

Disadvantages of neodymium magnets:

  • They can break when subjected to a powerful impact. If the magnets are exposed to impacts, we recommend using magnets in a steel housing. The steel housing in the form of a holder protects the magnet from impacts, and at the same time increases its overall strength,
  • High temperatures can reduce the strength of neodymium magnets. Typically, after heating above 80°C, most of them experience a permanent reduction in strength (although it is dependent on the form and size). To prevent this, we offer special magnets marked with the symbol [AH], which are highly resistant to high temperatures. They can operate even at temperatures up to 230°C, making them an ideal solution for applications requiring high-temperature operation,
  • Due to their susceptibility to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic, or other moisture-resistant materials when using them outdoors,
  • The use of a cover or a magnetic holder is recommended due to the limited possibilities of manufacturing threads or complex shapes in the magnet
  • Health risk associated with microscopic parts of magnets can be dangerous, when accidentally ingested, which is particularly important in the context of children's health. Furthermore, miniscule components of these magnets can complicate diagnosis in case of swallowing.

Exercise Caution with Neodymium Magnets

Keep neodymium magnets as far away as possible from GPS and smartphones.

Neodymium magnets generate strong magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets can demagnetize at high temperatures.

Despite the general resilience of magnets, their ability to maintain their magnetic potency can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

Dust and powder from neodymium magnets are highly flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. Once crushed into fine powder or dust, this material becomes highly flammable.

The magnet is coated with nickel - be careful 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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

  Neodymium magnets should not be around children.

Neodymium magnets are not toys. Do not allow children to play with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Neodymium magnets should not be near 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.

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 will crack or crumble with uncontrolled connecting to each other. You can't move them to each other. At a distance less than 10 cm you should hold them very firmly.

Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their strength can shock you.

Please review the information on how to handle neodymium magnets and avoid significant harm to your body, as well as prevent unintentional damage to the magnets.

Neodymium magnets are noted for being fragile, which can cause them to become damaged.

Magnets made of neodymium are fragile and will crack if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Keep neodymium magnets away from the wallet, computer, and TV.

Strong magnetic fields emitted by neodymium magnets can destroy magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

So that know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous very powerful neodymium magnets.

Dhit sp. z o.o. logo

e-mail: bok@dhit.pl

tel: +48 888 99 98 98