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SM 25x125 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130288

GTIN: 5906301812814

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diameter Ø

25 mm [±0,1 mm]

height

125 mm [±0,1 mm]

max. temperature

≤ 80 °C

319.80 PLN gross price (including VAT) / pcs +

260.00 PLN net price + 23% VAT / pcs

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Give us a call tel: +48 22 499 98 98 or contact us through contact form on our website. You can check the strength and the appearance of neodymium magnets in our magnetic calculator magnetic mass calculator

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

Specification: magnetic separator 25x125 [2xM8] / N42

Characteristics: magnetic separator 25x125 [2xM8] / N42

Properties

Values

catalog number

130288

GTIN

5906301812814

production / distribution

Dhit sp. z o.o.

country of origin

Poland / China / Germany

customs code

85059029

diameter Ø

25 mm [±0,1 mm]

height

125 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 - 4 nabiegunniki

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

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

Properties

Values

units

Vickers hardness

≥550

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 embedded in a casing made of stainless steel mostly AISI304. In this way, it is possible to effectively 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 targeted. The thickness of the magnet and its structure pitch affect the range and strength of the separator's operation.

Generally speaking, magnetic separators are used to separate 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 find application in the food sector for the elimination of metallic contaminants, including iron fragments or iron dust. Our rollers are made from durable acid-resistant steel, AISI 304, approved for contact with food.

Magnetic rollers, often called cylindrical magnets, are employed in metal separation, food production as well as waste processing. They help in removing iron dust during the process of separating metals from other wastes.

Our magnetic rollers are composed of neodymium magnets anchored in a tube made of stainless steel with a wall thickness of 1mm.

From both sides of the magnetic bar will be with M8 threaded openings, allowing for quick installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.

In terms of forces, magnetic bars stand out in terms of flux density, magnetic force lines 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. Nevertheless, 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 specific needs. The standard operating temperature of a magnetic bar is 80°C.

In the case where the magnet is more flat, the magnetic force lines are short. On the other hand, in the case of a thicker magnet, the force lines will be longer and extend over a greater distance.

For creating the casings of magnetic separators - rollers, usually stainless steel is used, especially types AISI 304, AISI 316, and AISI 316L.

In a saltwater contact, AISI 316 steel is recommended due to its excellent corrosion resistance.

Magnetic rollers are characterized by their specific arrangement of poles and their capability to attract magnetic particles directly onto their surface, as opposed to other separators that may utilize more complicated filtration systems.

Technical designations and terms pertaining to magnetic separators include among others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.

Magnetic induction for a roller is measured 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 outcome is checked 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 rollers offer a range of benefits such as excellent separation efficiency, strong magnetic field, and durability. However, some of the downsides may involve higher cost compared to other types of magnets and the need for regular maintenance.

For proper maintenance of neodymium magnetic rollers, it is advised {to clean them regularly from contaminants, avoid extremal temperatures up to 80°C, and cleaning after each use, avoiding temperatures above 80 degrees. The rollers have an IP67 waterproof rating, so if they are not sealed, the magnets inside may rust and weaken. Roller inspections are suggested to be conducted every two years. Care should be taken as there is a possibility of finger injury. If the protective tube is only 0.5 mm thick, it can wear out, which, in turn, may lead to issues with the magnetic rod becoming unsealed and product contamination. The Roller operating range equals its diameter, fi25mm is approximately 25mm active range, while fi32 is about 40mm.

Shopping tips

Product available shipping in 3 days!

cylindrical magnet 15x10 / N38 ↑ axial

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magnetic separator 18x175 [2xM5] / N42

387.45 PLN / pcs

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lamellar magnet 40x5x3 / N38 ↑ axial

3.97 PLN / pcs

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magnetic holder external thread 16x13x5 [M4] GZ / N38

3.89 PLN / pcs

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

They do not lose strength over time - after 10 years, their strength decreases by only ~1% (theoretically),
They protect against demagnetization caused by external magnetic sources very well,
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 hugely high magnetic induction on the surface of the magnet and can operate (depending on the form) even at temperatures of 230°C or higher...
Thanks to the flexibility in shaping and the ability to adapt to specific requirements – neodymium magnets can be produced in various forms and dimensions, which expands the range of their possible uses.
Key role in advanced technologically fields – are utilized in computer drives, electric motors, medical devices 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,
They lose power at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the form and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
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 or a magnetic holder is recommended due to the limited possibilities of manufacturing threads or complex shapes in the magnet
Health risk to health from tiny fragments of magnets can be dangerous, in case of ingestion, which is crucial in the context of children's health. It's also worth noting that small elements of these magnets can hinder the diagnostic process after entering the body.

Safety Precautions

Dust and powder from neodymium magnets are 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.

Neodymium magnets can become demagnetized 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.

You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.

The strong magnetic field generated by neodymium magnets can damage magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, or other devices. They can also damage devices like video players, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Keep neodymium magnets away from 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.

Maintain neodymium magnets away from children.

Not all neodymium magnets are toys, so do not let children play with them. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Magnets made of neodymium are delicate and can easily break and get damaged.

Neodymium magnets are highly fragile, and by joining them in an uncontrolled manner, they will crack. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of collision between the magnets, sharp metal fragments can be dispersed in different directions.

Never bring neodymium magnets close to a phone and GPS.

Intense magnetic 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 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 swellings.

Neodymium magnets bounce and touch each other mutually within a distance of several to around 10 cm from each other.

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

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

So you are aware of why neodymium magnets are so dangerous, see the article titled How dangerous are very powerful neodymium magnets?.

SM 25x125 [2xM8] / N42 - magnetic roller

magnetic separator

Specification: magnetic separator 25x125 [2xM8] / N42

Magnetic properties of the material N42

Physical properties of sintered neodymium magnets Nd2Fe14B

Shopping tips

cylindrical magnet 15x10 / N38 ↑ axial

magnetic separator 18x175 [2xM5] / N42

lamellar magnet 40x5x3 / N38 ↑ axial

magnetic holder external thread 16x13x5 [M4] GZ / N38

Advantages as well as disadvantages of neodymium magnets NdFeB.

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B