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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our store's offer. Practically all "magnets" in our store are in stock for immediate delivery (see the list). See the magnet pricing for more details see the magnet price list

Magnet for water searching F300 GOLD

Where to purchase powerful neodymium magnet? Magnet holders in airtight, solid steel enclosure are ideally suited for use in challenging climate conditions, including in the rain and snow more...

magnets with holders

Magnetic holders can be applied to facilitate manufacturing, underwater exploration, or locating meteors from gold more...

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Product available shipping tomorrow!

SM 25x400 [2xM8] / N52 - magnetic roller

magnetic separator

catalog number 130470

GTIN: 5906301813132

no reviews

diameter Ø

25 mm [±0,1 mm]

height

400 mm [±0,1 mm]

max. temperature

≤ 80 °C

1205.40 ZŁ gross price (including VAT) / pcs +

980.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?
price from 1 pcs
980.00 ZŁ
1205.40 ZŁ
price from 3 pcs
931.00 ZŁ
1145.13 ZŁ
price from 5 pcs
882.00 ZŁ
1084.86 ZŁ

Want to bargain?

Call us tel: +48 888 99 98 98 or get in touch through contact form on our website. You can check the mass and the appearance of neodymium magnets in our magnetic mass calculator power calculator

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

Specification: magnetic separator 25x400 [2xM8] / N52

Characteristics: magnetic separator 25x400 [2xM8] / N52
Properties
Values
catalog number
130470
GTIN
5906301813132
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
25 mm [±0,1 mm]
height
400 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 N52
ilość gwintów
2x [M8] wewnętrzne
biegunowość
obwodowa - 15 nabiegunników
indukcja magnetyczna
~ 9 500 Gauss [±5%]
max. temp. pracy
poniżej ≤ 80°C
grubość rury osłonowej
1 mm

Magnetic properties of the material N52

material characteristics N52
Properties
Values
units
remenance Br [Min. - Max.] ?
14.2-14.7
kGs
remenance Br [Min. - Max.] ?
1420-1470
T
coercivity bHc ?
10.8-12.5
kOe
coercivity bHc ?
860-995
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.]
48-53
BH max MGOe
energy density [Min. - Max.]
380-422
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 magnetic separator, namely the magnetic roller, uses the force of neodymium magnets, which are placed in a casing made of stainless steel mostly AISI304. Due to this, it is possible to efficiently separate ferromagnetic elements from different substances. A key aspect of its operation is the use of repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be collected. The thickness of the magnet and its structure's pitch determine the power and range of the separator's operation.
Generally speaking, magnetic separators are used to extract ferromagnetic particles. If the cans are made of ferromagnetic materials, 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 the food industry to remove metallic contaminants, such as iron fragments or iron dust. Our rods are constructed from acid-resistant steel, EN 1.4301, suitable for contact with food.
Magnetic rollers, often called magnetic separators, find application in food production, metal separation as well as recycling. They help in extracting iron dust in the course of the process of separating metals from other wastes.
Our magnetic rollers are composed of neodymium magnets placed in a stainless steel tube cylinder of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar will be with M8 threaded holes - 18 mm, 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 differ in terms of magnetic force lines, flux density and the area of operation of the magnetic field. We produce them in two materials, N42 and N52.
Usually it is believed that the greater the magnet's power, the better. Nevertheless, the value of the magnet's power is dependent 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 thin, the magnetic force lines are more compressed. By contrast, in the case of a thicker magnet, the force lines are longer and extend over a greater distance.
For constructing the casings of magnetic separators - rollers, most often stainless steel is employed, particularly types AISI 304, AISI 316, and AISI 316L.
In a saltwater contact, type AISI 316 steel is recommended due to its excellent anti-corrosion properties.
Magnetic bars stand out for their unique configuration of poles and their ability to attract magnetic substances directly onto their surface, in contrast to other separators that often use complex filtration systems.
Technical designations and terms pertaining to magnetic separators comprise amongst others magnet pitch, polarity, and magnetic induction, as well as the steel type applied.
Magnetic induction for a roller is determined using a teslameter or a gaussmeter with a flat Hall-effect probe, aiming to find the highest magnetic field value close to the magnetic pole. The result is checked 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 rollers offer many advantages, including excellent separation efficiency, strong magnetic field, and durability. On the other hand, among the drawbacks, one can mention the requirement for frequent cleaning, greater weight, and potential installation difficulties.
For proper maintenance of neodymium magnetic rollers, you should they should be regularly cleaned, avoiding temperatures above 80 degrees. The rollers feature waterproofing IP67, so if they are not sealed, the magnets inside can rust and weaken. Magnetic field measurements should be carried out once every 24 months. Caution should be taken during use, as there is a risk getting pinched. 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 is equal 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 metal separation is crucial.

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Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their power (of the magnet). After approximately 10 years, their strength decreases by only ~1% (theoretically),
  • They are exceptionally resistant to demagnetization caused by an external magnetic field,
  • In other words, thanks to the shiny coating of nickel, gold, or silver, the element acquires 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 form) even at temperatures of 230°C or higher...
  • The ability for precise shaping or customization to specific needs – neodymium magnets can be produced in many variants of shapes and sizes, which enhances their versatility in applications.
  • Wide application in advanced technologically fields – are utilized in computer drives, electric drive mechanisms, medical devices and other modern machines.

Disadvantages of neodymium magnets:

  • They are prone to breaking as they are extremely fragile when subjected to a strong impact. If the magnets are exposed to impacts, it is suggested using magnets in a steel housing. The steel housing in the form of a holder protects the magnet from impacts and also increases its overall strength,
  • High temperatures can reduce the power of neodymium magnets. Typically, after heating above 80°C, most of them experience a permanent loss in strength (although it is dependent on the shape 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 recommend using waterproof magnets made of rubber, plastic, or other moisture-resistant materials when using them outdoors,
  • 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
  • Potential hazard arising from small pieces of magnets can be dangerous, when accidentally ingested, which is crucial in the context of children's health. It's also worth noting that tiny parts of these devices can hinder the diagnostic process in case of swallowing.

Handle Neodymium Magnets with Caution

Never bring neodymium magnets close to a phone and GPS.

Strong fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets are among the strongest magnets on Earth. The surprising force they generate between each other can surprise you.

To use magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

Neodymium magnets can demagnetize at high temperatures.

Even though magnets have been found to maintain their efficacy up to temperatures of 80°C or 175°F, it's essential to consider that this threshold may fluctuate depending on the magnet's type, configuration, and intended usage.

  Neodymium magnets should not be in the vicinity youngest children.

Remember that 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 are fragile as well as can easily crack as well as get damaged.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. 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.

The magnet is coated with nickel. Therefore, exercise caution 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.

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.

People with pacemakers are advised to avoid neodymium magnets.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

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

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

If the joining of neodymium magnets is not controlled, then they may crumble and also crack. You can't move them to each other. At a distance less than 10 cm you should hold them extremely firmly.

In order to illustrate why neodymium magnets are so dangerous, read the article - How very dangerous are very powerful neodymium magnets?.
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tel: +48 888 99 98 98