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neodymium magnets

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SM 32x350 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130301

GTIN: 5906301812944

5.0

diameter Ø

32 mm [±0,1 mm]

height

350 mm [±0,1 mm]

max. temperature

≤ 80 °C

1045.50 gross price (including VAT) / pcs +

850.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
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Give us a call tel: +48 22 499 98 98 or write via contact form on our website. You can check the lifting capacity as well as the appearance of neodymium magnet in our force calculator force calculator

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Specification: magnetic separator 32x350 [2xM8] / N42

Characteristics: magnetic separator 32x350 [2xM8] / N42
Properties
Values
catalog number
130301
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
32 mm [±0,1 mm]
height
350 mm [±0,1 mm]
max. temperature ?
≤ 80 °C
weight
1870.00 g
execution tolerance
± 0.1 mm
rodzaj materiału
AISI 304 - bezpieczna dla żywności
rodzaj magnesów
NdFeB N42
ilość gwintów
2x [M8] wewnętrzne
biegunowość
obwodowa - 13 nadbiegunników
indukcja magnetyczna
~ 8 000 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 magnetic separator, namely the magnetic roller, uses the force of neodymium magnets, which are welded in a casing made of stainless steel usually AISI304. As a result, it is possible to efficiently remove ferromagnetic particles from the mixture. An important element of its operation is the use of repulsion of magnetic poles N and S, which enables magnetic substances to be attracted. The thickness of the embedded magnet and its structure's pitch determine the power and range of the separator's operation.
Generally speaking, magnetic separators are designed to extract ferromagnetic elements. 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 separator will not be able to separate them.
Yes, magnetic rollers are employed in the food industry to remove metallic contaminants, for example iron fragments or iron dust. Our rods are made from durable acid-resistant steel, EN 1.4301, intended for contact with food.
Magnetic rollers, often called magnetic separators, find application in food production, metal separation as well as waste processing. They help in removing iron dust in the course of the process of separating metals from other materials.
Our magnetic rollers are composed of neodymium magnets anchored in a stainless steel tube casing of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, allowing for easy installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of forces, magnetic bars differ in terms of magnetic force lines, flux density and the area of operation of the magnetic field. We produce them in materials, N42 and N52.
Often it is believed that the stronger the magnet, the better. But, 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 application and expected needs. The standard operating temperature of a magnetic bar is 80°C.
When the magnet is more flat, the magnetic force lines are more compressed. Otherwise, when the magnet is thick, the force lines will be extended and extend over a greater distance.
For making the casings of magnetic separators - rollers, frequently stainless steel is employed, especially types AISI 316, AISI 316L, and AISI 304.
In a salt water contact, AISI 316 steel is recommended due to its outstanding corrosion resistance.
Magnetic bars stand out for their unique configuration of poles and their ability to attract magnetic particles directly onto their surface, in contrast to other devices that may utilize complex filtration systems.
Technical designations and terms related to magnetic separators comprise amongst others magnet pitch, polarity, and magnetic induction, as well as the steel type applied.
Magnetic induction for a magnet on 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 outcome is verified in a value table - the lowest is N30. All designations below N27 or N25 suggest recycling that doesn't meet 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. On the other hand, among the drawbacks, one can mention higher cost compared to other types of magnets and the need for regular maintenance.
By ensuring proper maintenance of neodymium magnetic rollers, you should they should be regularly cleaned, avoiding temperatures up to 80°C. The rollers feature waterproofing IP67, so if they are not sealed, the magnets inside can rust and lose their power. 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 cause 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.
Magnetic rollers are cylindrical neodymium magnets placed in a casing made of corrosion-resistant stainless steel, 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 strength over time. After about 10 years, their strength decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic sources,
  • In other words, thanks to the shiny coating of nickel, gold, or silver, the element acquires an aesthetic appearance,
  • They possess very high magnetic induction on the surface of the magnet,
  • Thanks to their high temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C and above...
  • The ability for precise shaping and customization to specific needs – neodymium magnets can be produced in various forms and dimensions, which enhances their versatility in applications.
  • Wide application in the industry of new technologies – are utilized in computer drives, electric motors, medical devices and other modern machines.

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 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 form 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 recommend 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
  • Health risk arising from small pieces of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting young children. It's also worth noting that miniscule components of these devices can complicate diagnosis in case of swallowing.

Handle Neodymium Magnets Carefully

Neodymium magnets can demagnetize at high temperatures.

Although magnets have shown to retain their effectiveness up to 80°C or 175°F, this temperature may vary depending on the type of material, shape, and intended use of the magnet.

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.

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 the joining of neodymium magnets is not under control, at that time they may crumble and also crack. You can't approach them to each other. At a distance less than 10 cm you should hold them very strongly.

Magnets made of neodymium are especially delicate, which leads to their breakage.

Magnets made of neodymium are fragile as well as will shatter 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. At the moment of collision between the magnets, small sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

The magnet is coated with nickel - be careful if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including 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.

Keep neodymium magnets away from people with pacemakers.

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 brought 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.

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times stronger, and their strength can surprise 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.

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

Neodymium magnets generate intense magnetic fields that can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets away from these electronic devices.

  Neodymium magnets should not be around youngest children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Please see the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98