e-mail: bok@dhit.pl

neodymium magnets

We offer blue color magnets Nd2Fe14B - our offer. Practically all magnesy on our website are in stock for immediate delivery (see the list). See the magnet price list for more details check the magnet price list

Magnets for treasure hunters F400 GOLD

Where to purchase powerful magnet? Magnet holders in solid and airtight steel enclosure are perfect for use in variable and difficult climate conditions, including in the rain and snow read...

magnetic holders

Magnetic holders can be applied to enhance manufacturing, exploring underwater areas, or searching for meteorites made of metal check...

Enjoy delivery of your order if the order is placed before 2:00 PM on weekdays.

Dhit sp. z o.o. logo
Product available shipping tomorrow

SM 25x325 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130349

GTIN: 5906301812975

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

325 mm

Weight

0.01 g

910.20 with VAT / pcs + price for transport

740.00 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs
740.00 ZŁ
910.20 ZŁ
price from 5 pcs
703.00 ZŁ
864.69 ZŁ
price from 10 pcs
666.00 ZŁ
819.18 ZŁ

Not sure what to buy?

Call us +48 22 499 98 98 alternatively drop us a message using inquiry form the contact section.
Weight along with structure of a neodymium magnet can be analyzed on our force calculator.

Same-day processing for orders placed before 14:00.

SM 25x325 [2xM8] / N42 - magnetic separator

Specification/characteristics SM 25x325 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130349
GTIN
5906301812975
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
325 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material 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 NdFeB

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

Shopping tips

The device roller magnetic is based on the use of neodymium magnets, which are welded in a casing made of stainless steel usually AISI304. In this way, it is possible to precisely remove ferromagnetic particles from different substances. A fundamental component of its operation is the use of repulsion of magnetic poles N and S, which enables magnetic substances to be collected. The thickness of the magnet and its structure pitch affect the power and range of the separator's operation.
Generally speaking, magnetic separators serve to separate ferromagnetic particles. If the cans are made from ferromagnetic materials, the separator will effectively segregate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not effectively segregate them.
Yes, magnetic rollers find application in the food industry to clear metallic contaminants, including iron fragments or iron dust. Our rods are constructed from acid-resistant steel, AISI 304, intended for contact with food.
Magnetic rollers, otherwise cylindrical magnets, find application in food production, metal separation as well as recycling. They help in removing iron dust in the course of the process of separating metals from other wastes.
Our magnetic rollers are built with a neodymium magnet anchored in a stainless steel tube casing made of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar will be with M8 threaded holes - 18 mm, 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 area of operation of the magnetic field. We produce them in materials, N42 as well as N52.
Generally it is believed that the greater the magnet's power, the more effective. Nevertheless, the value of the magnet's power is based on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of application and expected needs. The standard operating temperature of a magnetic bar is 80°C.
When the magnet is thin, the magnetic force lines are short. Otherwise, when the magnet is thick, the force lines are longer and extend over a greater distance.
For creating the casings of magnetic separators - rollers, usually stainless steel is utilized, especially types AISI 316, AISI 316L, and AISI 304.
In a saltwater contact, type AISI 316 steel exhibits the best resistance due to its exceptional corrosion resistance.
Magnetic rollers stand out for their specific arrangement of poles and their ability to attract magnetic substances directly onto their surface, as opposed to other separators that may utilize complex filtration systems.
Technical designations and terms related to magnetic separators include amongst others polarity, magnetic induction, magnet pitch, as well as the steel type applied.
Magnetic induction for a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value close to the magnetic pole. The outcome is verified in a value table - the lowest is N30. All designations less than N27 or N25 suggest recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic rollers offer a range of benefits such as higher attracting power, longer lifespan, and effectiveness in separating fine metal particles. However, some of the downsides may involve the need for regular cleaning, higher cost, and potential installation challenges.
By ensuring proper maintenance of neodymium magnetic rollers, it is recommended cleaning regularly, avoiding temperatures up to 80°C. The rollers feature waterproofing IP67, so if they are leaky, the magnets inside can rust and weaken. Magnetic field measurements is recommended be carried out every two years. Caution should be taken during use, as it’s possible 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 effective 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 the removal of iron metals and iron filings is essential.

Advantages as well as disadvantages of neodymium magnets NdFeB.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

  • They do not lose their even over around 10 years – the decrease of lifting capacity is only ~1% (theoretically),
  • They show exceptional resistance to demagnetization from external field exposure,
  • In other words, due to the metallic silver coating, the magnet obtains an stylish appearance,
  • The outer field strength of the magnet shows elevated magnetic properties,
  • They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
  • Thanks to the possibility in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in diverse shapes and sizes, which expands their application range,
  • Significant impact in cutting-edge sectors – they are used in data storage devices, electric motors, healthcare devices along with other advanced devices,
  • Thanks to their concentrated strength, small magnets offer high magnetic performance, with minimal size,

Disadvantages of NdFeB magnets:

  • They are prone to breaking when subjected to a heavy impact. If the magnets are exposed to physical collisions, we recommend in a metal holder. The steel housing, in the form of a holder, protects the magnet from cracks , and at the same time strengthens its overall resistance,
  • They lose power at high temperatures. Most neodymium magnets experience permanent decline in strength when heated above 80°C (depending on the form and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
  • Due to corrosion risk in humid conditions, it is recommended to use sealed magnets made of protective material for outdoor use,
  • Using a cover – such as a magnetic holder – is advised due to the limitations in manufacturing threads directly in the magnet,
  • Potential hazard linked to microscopic shards may arise, especially if swallowed, which is important in the health of young users. Furthermore, miniature parts from these assemblies might hinder health screening after being swallowed,
  • Due to the price of neodymium, their cost is above average,

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The given holding capacity of the magnet corresponds to the highest holding force, calculated in the best circumstances, specifically:

  • with the use of low-carbon steel plate serving as a magnetic yoke
  • of a thickness of at least 10 mm
  • with a smooth surface
  • in conditions of no clearance
  • under perpendicular detachment force
  • in normal thermal conditions

Practical aspects of lifting capacity – factors

The lifting capacity of a magnet depends on in practice key elements, according to their importance:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) causes a drop in lifting force of up to 50%.
  • Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
  • Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
  • Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
  • Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
  • Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap {between} the magnet and the plate decreases the lifting capacity.

Exercise Caution with Neodymium Magnets

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

Strong magnetic fields emitted by neodymium magnets can damage 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.

Avoid bringing neodymium magnets close to a phone or GPS.

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.

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

If you have a finger between or alternatively on the path of attracting magnets, there may be a serious cut or a fracture.

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnets are the strongest magnets ever created, and their power 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.

The magnet coating contains nickel, so be cautious if you have a nickel 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.

Magnets made of neodymium are noted for their fragility, which can cause them to crumble.

Magnets made of neodymium are extremely fragile, and by joining them in an uncontrolled manner, they will crumble. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Neodymium magnets can demagnetize at high temperatures.

Whilst Neodymium magnets can demagnetize 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.

  Neodymium magnets should not be around youngest 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.

Warning!

To show why neodymium magnets are so dangerous, read the article - How dangerous are very strong neodymium magnets?.

Dhit sp. z o.o. logo

e-mail: bok@dhit.pl

tel: +48 888 99 98 98