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neodymium magnets

We provide blue color magnets Nd2Fe14B - our offer. All "neodymium magnets" in our store are in stock for immediate delivery (see the list). See the magnet price list for more details see the magnet price list

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SM 32x325 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130378

GTIN: 5906301813262

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diameter Ø

32 mm [±0,1 mm]

height

325 mm [±0,1 mm]

max. temperature

≤ 80 °C

971.70 gross price (including VAT) / pcs +

790.00 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 through contact form on the contact page. You can check the lifting capacity and the appearance of neodymium magnets in our magnetic mass calculator force calculator

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Specification: magnetic separator 32x325 [2xM8] / N42

Characteristics: magnetic separator 32x325 [2xM8] / N42
Properties
Values
catalog number
130378
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
32 mm [±0,1 mm]
height
325 mm [±0,1 mm]
max. temperature ?
≤ 80 °C
weight
1740.00 g
execution tolerance
± 0.1 mm
rodzaj materiału
AISI 304 - bezpieczna dla żywności
rodzaj magnesów
NdFeB N42
ilość gwintów
2x [M8] wewnętrzne
biegunowość
obwodowa - 12 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 device roller magnetic is based on the use of neodymium magnets, which are welded in a casing made of stainless steel mostly AISI304. As a result, it is possible to efficiently remove ferromagnetic elements from the mixture. An important element of its operation is the repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be collected. The thickness of the magnet and its structure's pitch affect the range and strength of the separator's operation.
Generally speaking, magnetic separators are designed to extract ferromagnetic particles. If the cans are made of ferromagnetic materials, a magnetic separator will be effective. 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, such as iron fragments or iron dust. Our rods are constructed from acid-resistant steel, AISI 304, intended for contact with food.
Magnetic rollers, otherwise cylindrical magnets, are used in food production, metal separation 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 of stainless steel with a wall thickness of 1mm.
From both sides of the magnetic bar can be with M8 threaded holes - 18 mm, which enables 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 area of operation of the magnetic field. We produce them in materials, N42 as well as N52.
Usually it is believed that the stronger the magnet, the better. But, the strength of the magnet's power is based 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 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 short. On the other hand, in the case of a thicker magnet, the force lines will be extended and reach further.
For making the casings of magnetic separators - rollers, most often stainless steel is used, especially types AISI 304, AISI 316, and AISI 316L.
In a salt water environment, type AISI 316 steel is recommended due to its exceptional anti-corrosion properties.
Magnetic bars are characterized by their specific arrangement of poles and their ability to attract magnetic particles directly onto their surface, in contrast to other separators that may utilize more complicated filtration systems.
Technical designations and terms related to magnetic separators include amongst others polarity, magnetic induction, magnet pitch, as well as the type of steel used.
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 near the magnetic pole. The outcome is checked in a value table - the lowest is N30. All designations less than N27 or N25 suggest recycling that doesn't meet the standard - they are not suitable.
Neodymium magnetic rollers offer a range of benefits such as a very strong magnetic field, the ability to capture even the tiniest metal particles, and durability. Disadvantages may include the need for regular cleaning, higher cost, and potential installation challenges.
For proper maintenance of neodymium magnetic rollers, it is advised to clean them regularly from deposits, avoid extremal temperatures up to 80°C, and washing regularly, avoiding temperatures above 80 degrees. The rollers have an IP67 waterproof rating, so if they are not watertight, the magnets inside may rust and weaken. Magnetic field measurements are advised to be conducted every two years. Caution should be exercised during use 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, 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 and disadvantages of neodymium magnets NdFeB.

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

  • They do not lose power over time. After 10 years, their power decreases by only ~1% (theoretically),
  • They are extremely resistant to demagnetization by external magnetic field,
  • Thanks to the shiny finish and nickel, gold, or silver coating, they have an aesthetic appearance,
  • They have very high magnetic induction on the surface of the magnet,
  • Magnetic neodymium magnets are characterized by very high magnetic induction on the surface of the magnet and can operate (depending on the form) even at temperatures of 230°C or higher...
  • 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.
  • Key role in the industry of new technologies – find application in HDD drives, electric motors, medical devices and various technologically advanced devices.

Disadvantages of neodymium magnets:

  • They are prone to breaking as they are extremely fragile 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 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 loss in strength (although it is dependent on the shape 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,
  • 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 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, in case of ingestion, which is particularly important in the context of children's health. Furthermore, small elements of these products have the potential to hinder the diagnostic process when they are in the body.

Exercise Caution with Neodymium Magnets

Keep neodymium magnets away from 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.

Magnets made of neodymium are particularly fragile, which leads to their breakage.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. They are coated with a shiny nickel plating similar to steel, but they are not as hard. At the moment of connection between the magnets, small sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

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 destroy devices like video players, televisions, CRT computer monitors. Do not forget to keep neodymium magnets at a safe distance from these electronic devices.

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.

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.

Keep neodymium magnets away from GPS and smartphones.

Neodymium magnets produce intense magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

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, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

 It is essential to maintain neodymium magnets away from 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.

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

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

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

Magnets may crack or crumble with uncontrolled joining to each other. Remember not to move them to each other or have them firmly in hands at a distance less than 10 cm.

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