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neodymium magnets

We offer red color magnetic Nd2Fe14B - our proposal. Practically all "neodymium magnets" in our store are in stock for immediate delivery (check the list). See the magnet price list for more details see the magnet price list

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Holders with magnets can be applied to improve manufacturing, underwater exploration, or locating meteors made of ore see more...

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SM 32x250 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130299

GTIN: 5906301812920

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diameter Ø

32 mm [±0,1 mm]

height

250 mm [±0,1 mm]

max. temperature

≤ 80 °C

750.30 gross price (including VAT) / pcs +

610.00 ZŁ net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
610.00 ZŁ
750.30 ZŁ
price from 4 pcs
579.50 ZŁ
712.78 ZŁ
price from 8 pcs
549.00 ZŁ
675.27 ZŁ

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Call us tel: +48 888 99 98 98 or write through form on the contact page. You can check the mass and the shape of magnet in our power calculator force calculator

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Specification: magnetic separator 32x250 [2xM8] / N42

Characteristics: magnetic separator 32x250 [2xM8] / N42
Properties
Values
catalog number
130299
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
32 mm [±0,1 mm]
height
250 mm [±0,1 mm]
max. temperature ?
≤ 80 °C
weight
1240.00 g
execution tolerance
± 0.1 mm
rodzaj materiału
AISI 304 - bezpieczna dla żywności
rodzaj magnesów
NdFeB N42
ilość gwintów
2x [M8] wewnętrzne
biegunowość
obwodowa - 9 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 main mechanism of the magnetic separator is the use of neodymium magnets, which are embedded in a casing made of stainless steel mostly AISI304. Due to this, it is possible to efficiently remove ferromagnetic particles from other materials. A key aspect of its operation is the use of repulsion of magnetic poles N and S, which allows magnetic substances to be targeted. The thickness of the 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 made from ferromagnetic materials, a magnetic separator will be effective. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the magnetic separator will not be effective.
Yes, magnetic rollers are used in food production to remove metallic contaminants, including iron fragments or iron dust. Our rollers are made from durable acid-resistant steel, AISI 304, approved for use in food.
Magnetic rollers, often called magnetic separators, are used in food production, metal separation 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 placed in a tube of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, enabling 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 flux density, magnetic force lines and the area of operation of the magnetic field. We produce them in materials, N42 and N52.
Often it is believed that the greater the magnet's power, the more effective. But, the strength 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 anticipated 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 more compressed. By contrast, when the magnet is thick, the force lines will be longer and extend over a greater distance.
For creating the casings of magnetic separators - rollers, frequently stainless steel is utilized, particularly types AISI 304, AISI 316, and AISI 316L.
In a salt water contact, AISI 316 steel exhibits the best resistance due to its outstanding corrosion resistance.
Magnetic bars stand out for their specific arrangement of poles and their capability to attract magnetic substances directly onto their surface, in contrast to other devices that often use more complicated filtration systems.
Technical designations and terms related to magnetic separators include amongst others magnet pitch, polarity, and magnetic induction, as well as the type of steel used.
Magnetic induction for a magnet on 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 checked 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 rollers offer many advantages, including a very strong magnetic field, the ability to capture even the tiniest metal particles, and durability. Disadvantages may include the requirement for frequent cleaning, greater weight, and potential installation difficulties.
For proper maintenance of neodymium magnetic rollers, it is advised to clean them regularly from deposits, avoid extreme temperatures above 80 degrees, and cleaning after each use, avoiding temperatures above 80 degrees. The rollers our rollers have an IP67 waterproof rating, so if they are not sealed, the magnets inside may rust and weaken. Magnetic field measurements are recommended to be conducted once every 24 months. Care should be taken as there is a risk of finger injury. If the protective tube is only 0.5 mm thick, it can be worn down, which, in turn, can result in 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.

List recommended items

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • They do not lose their strength (of the magnet). After about 10 years, their power decreases by only ~1% (theoretically),
  • They are extremely 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 exhibit extremely 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...
  • Due to the option of accurate forming and adaptation to individual needs – neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of their possible uses.
  • Key role in modern technologies – find application in hard drives, electric drive mechanisms, medical devices or other modern machines.

Disadvantages of neodymium magnets:

  • They can break 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,
  • They rust in a humid environment. For outdoor use, we recommend using waterproof magnets, such as those made of rubber or plastic,
  • 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
  • Possible danger to health from tiny fragments of magnets are risky, when accidentally ingested, which is crucial in the context of child safety. Furthermore, miniscule components of these devices are able to hinder the diagnostic process after entering the body.

Caution with Neodymium Magnets

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 injuries.

Neodymium magnets jump and also clash mutually within a distance of several to almost 10 cm from each other.

Keep neodymium magnets away from GPS and smartphones.

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

  Magnets are not toys, youngest should not play with them.

Neodymium magnets are not toys. Be cautious and make sure no child plays 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.

Neodymium magnets are the most powerful, most remarkable magnets on the planet, and the surprising force between them can surprise you at first.

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 the wallet, computer, and TV.

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, etc. devices. They can also destroy videos, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

Magnets made of neodymium are highly fragile, they easily crack as well as can crumble.

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 connection between the magnets, small metal fragments can be dispersed in different directions.

People with pacemakers are advised to avoid neodymium magnets.

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.

The magnet is coated with nickel - be careful 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Dust and powder from neodymium magnets are highly 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.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

In order for you to know how strong neodymium magnets are and why they are so dangerous, read the article - Dangerous very strong neodymium magnets.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98