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neodymium magnets

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SM 18x275 [2xM5] / N42 - magnetic roller

magnetic separator

catalog number 130276

GTIN: 5906301812784

5.0

diameter Ø

18 mm [±0,1 mm]

height

275 mm [±0,1 mm]

max. temperature

≤ 80 °C

608.85 PLN gross price (including VAT) / pcs +

495.00 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?
price from 1 pcs
495.00 PLN
608.85 PLN
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445.50 PLN
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Don't know what to choose?

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

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

Specification: magnetic separator 18x275 [2xM5] / N42

Characteristics: magnetic separator 18x275 [2xM5] / N42
Properties
Values
catalog number
130276
GTIN
5906301812784
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
18 mm [±0,1 mm]
height
275 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 [M5] wewnętrzne
biegunowość
obwodowa - 12 nabiegunników
indukcja magnetyczna
~ 5 400 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, placed in a casing made of stainless steel mostly AISI304. As a result, it is possible to effectively separate ferromagnetic elements from other materials. A key aspect of its operation is the repulsion of N and S poles of neodymium magnets, which allows magnetic substances to be targeted. The thickness of the embedded magnet and its structure pitch affect the power and range of the separator's operation.
Generally speaking, magnetic separators are used to separate ferromagnetic elements. 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 be able to separate them.
Yes, magnetic rollers are used in the food industry to remove metallic contaminants, such as iron fragments or iron dust. Our rollers are built from durable acid-resistant steel, AISI 304, suitable for contact with food.
Magnetic rollers, often called cylindrical magnets, find application in food production, metal separation as well as waste processing. They help in eliminating iron dust during the process of separating metals from other materials.
Our magnetic rollers are composed of a neodymium magnet embedded 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 openings, allowing for simple mounting in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of features, magnetic bars differ in terms of flux density, magnetic force lines and the area of operation 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 more efficient it is. However, 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 specific needs. The standard operating temperature of a magnetic bar is 80°C.
When the magnet is more flat, the magnetic force lines will be short. By contrast, in the case of a thicker magnet, the force lines are extended and extend over a greater distance.
For creating the casings of magnetic separators - rollers, frequently stainless steel is utilized, especially types AISI 316, AISI 316L, and AISI 304.
In a saltwater environment, AISI 316 steel exhibits the best resistance thanks to its excellent corrosion resistance.
Magnetic bars 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 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 magnet on 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 verified in a value table - the lowest is N30. All designations below N27 or N25 indicate recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic bars offer many advantages, including higher attracting power, longer lifespan, and effectiveness in separating fine metal particles. Disadvantages may include the requirement for frequent cleaning, greater weight, and potential installation difficulties.
For proper maintenance of neodymium magnetic rollers, it is suggested to clean them regularly from contaminants, avoid extremal temperatures above 80 degrees, and to clean them regularly, avoiding temperatures above 80 degrees. The rollers have an IP67 waterproof rating, so if they are not sealed, the magnets inside may rust and lose their strength. 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.

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Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They do not lose strength over time. After 10 years, their strength decreases by only ~1% (theoretically),
  • They are highly resistant to demagnetization by external magnetic field,
  • In other words, thanks to the glossy nickel, gold, or silver finish, the element gains an aesthetic appearance,
  • They have very 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...
  • Thanks to the flexibility in shaping or the ability to adapt to specific requirements – neodymium magnets can be produced in various forms and dimensions, which amplifies their universality in usage.
  • Key role in modern technologies – are used in computer drives, electric drive mechanisms, medical equipment and other highly developed apparatuses.

Disadvantages of neodymium magnets:

  • 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 at the same time increases its overall strength,
  • They lose strength at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the shape and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
  • 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 or a magnetic holder is recommended due to the limited possibilities of manufacturing threads or complex shapes in the magnet
  • Possible danger to health from tiny fragments of magnets pose a threat, in case of ingestion, which becomes significant in the context of children's health. Additionally, small elements of these products have the potential to be problematic in medical diagnosis when they are in the body.

Caution with Neodymium Magnets

Do not bring neodymium magnets close to GPS and smartphones.

Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Neodymium magnetic are incredibly fragile, they easily crack and can become damaged.

Neodymium magnets are characterized by considerable fragility. Magnets made of neodymium are made of metal and coated with a shiny nickel, but they are not as durable as steel. At the moment of collision between the magnets, small metal fragments can be dispersed in different directions.

Neodymium magnets should not be near people with pacemakers.

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.

Neodymium magnets can become demagnetized 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.

 It is essential to keep neodymium magnets away from children.

Neodymium magnets are not toys. You cannot allow them to become toys for children. In such a situation, surgery is necessary to remove them. In the worst case scenario, it can result in death.

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

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

In the situation of placing a finger in the path of a neodymium magnet, in that situation, a cut or a fracture may occur.

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

Neodymium magnets produce strong magnetic fields that can destroy magnetic media such as floppy disks, video tapes, HDDs, credit cards, magnetic ID cards, cassette tapes, etc. devices. They can also damage videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their power can shock 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.

Dust and powder from neodymium magnets are highly flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

In order for you to know how strong neodymium magnets are and why they are so dangerous, read the article - Dangerous very powerful neodymium magnets.
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tel: +48 888 99 98 98