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neodymium magnets

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SM 19x225 [2xM6] / N50 - magnetic roller

magnetic separator

catalog number 130241

GTIN: 5906301812708

5.0

diameter Ø

19 mm [±0,1 mm]

height

225 mm [±0,1 mm]

max. temperature

≤ 80 °C

492.00 ZŁ gross price (including VAT) / pcs +

400.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?
price from 1 pcs
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Call us tel: +48 888 99 98 98 or write through contact form on the contact page. You can check the strength as well as the shape of neodymium magnets in our power calculator magnetic mass calculator

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

Specification: magnetic separator 19x225 [2xM6] / N50

Characteristics: magnetic separator 19x225 [2xM6] / N50
Properties
Values
catalog number
130241
GTIN
5906301812708
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
19 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 N50
ilość gwintów
2x [M6] wewnętrzne
biegunowość
obwodowa - 12 nabiegunników
indukcja magnetyczna
~ 12 000 Gauss [±5%]
max. temp. pracy
poniżej ≤ 80°C
grubość rury osłonowej
0.5 mm

Magnetic properties of the material N50

material characteristics N50
Properties
Values
units
remenance Br [Min. - Max.] ?
14-14.6
kGs
remenance Br [Min. - Max.] ?
1400-1460
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.]
47-51
BH max MGOe
energy density [Min. - Max.]
374-406
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, placed in a casing made of stainless steel usually AISI304. In this way, it is possible to effectively segregate ferromagnetic particles from other materials. A key aspect of its operation is the repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be targeted. The thickness of the magnet and its structure pitch determine the range and strength of the separator's operation.
Generally speaking, magnetic separators are used to segregate ferromagnetic elements. If the cans are made from ferromagnetic materials, the separator will be able to separate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the magnetic separator will not be effective.
Yes, magnetic rollers find application in food production to clear metallic contaminants, for example iron fragments or iron dust. Our rods are built from durable acid-resistant steel, AISI 304, intended for contact with food.
Magnetic rollers, otherwise magnetic separators, are employed in metal separation, food production 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 a neodymium magnet anchored in a tube of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, which enables 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 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 better. But, 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 application and specific 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, usually stainless steel is utilized, particularly types AISI 316, AISI 316L, and AISI 304.
In a saltwater contact, AISI 316 steel exhibits the best resistance thanks to its outstanding anti-corrosion properties.
Magnetic bars stand out for their specific arrangement of poles and their ability to attract magnetic particles directly onto their surface, as opposed to other separators that may utilize complex filtration systems.
Technical designations and terms pertaining to magnetic separators comprise amongst 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, aiming to find 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 indicate recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic bars offer a range of benefits such as higher attracting power, longer lifespan, and effectiveness in separating fine metal particles. On the other hand, among the drawbacks, one can mention higher cost compared to other types of magnets and the need for regular maintenance.
For proper maintenance of neodymium magnetic rollers, it is recommended to clean them regularly from deposits, avoid extremal temperatures above 80 degrees, and protect them from moisture if the threads are not sealed - in our case. The rollers our rollers have an IP67 waterproof rating, so if they are not watertight, the magnets inside may rust and weaken. Magnetic field measurements are recommended to be conducted every two years. Caution should be exercised during use as there is a possibility of finger injury. If the protective tube is only 0.5 mm thick, it can be worn down, which, in turn, may lead to issues with the magnetic rod becoming unsealed and product contamination. The effective operating range of the roller equals its diameter, fi25mm is approximately 25mm active range, while fi32 is about 40mm.

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Advantages as well as disadvantages of neodymium magnets NdFeB.

Apart from immense power, neodymium magnets have the following advantages:

  • They do not lose their power (of the magnet). After about 10 years, their strength decreases by only ~1% (theoretically),
  • They are exceptionally resistant to demagnetization caused by an external magnetic field,
  • Thanks to the shiny finish and nickel, gold, or silver coating, they have an aesthetic appearance,
  • They exhibit extremely high magnetic induction on the surface of the magnet,
  • Thanks to their high temperature resistance, they can operate (depending on the form) even at temperatures up to 230°C and above...
  • Due to the option of accurate forming or 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 HDD drives, electric motors, medical equipment and other modern machines.

Disadvantages of neodymium magnets:

  • They can break as they are fragile when subjected to a strong 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 also 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,
  • 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 or a magnetic holder is recommended due to the limited possibilities of manufacturing threads or complex shapes in the magnet
  • Possible danger associated with microscopic parts of magnets are risky, if swallowed, which becomes significant in the context of child safety. Additionally, miniscule components of these products have the potential to be problematic in medical diagnosis after entering the body.

Exercise Caution with Neodymium Magnets

Neodymium magnets can demagnetize at high temperatures.

Whilst 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.

Under no circumstances should neodymium magnets be brought close to GPS and smartphones.

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

You should maintain neodymium magnets at a safe distance 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. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

  Magnets should not be treated as toys. Therefore, it is not recommended for 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.

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

To handle 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.

People with pacemakers are advised to avoid neodymium magnets.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Dust and powder from neodymium magnets are highly flammable.

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

Neodymium magnetic are highly delicate, they easily crack as well as can crumble.

Magnets made of neodymium are delicate 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 and coated with a shiny nickel plating, they are not as hard as steel. 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. 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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.

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

In order for you to know how strong neodymium magnets are and why they are so dangerous, read the article - Dangerous powerful neodymium magnets.
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e-mail: bok@dhit.pl

tel: +48 888 99 98 98