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neodymium magnets

We provide blue color magnets Nd2Fe14B - our offer. Practically all magnesy neodymowe in our store are in stock for immediate purchase (check the list). See the magnet pricing for more details see the magnet price list

Magnets for water searching F200 GOLD

Where to buy strong neodymium magnet? Holders with magnets in airtight, solid enclosure are perfect for use in variable and difficult weather conditions, including in the rain and snow more...

magnetic holders

Magnetic holders can be used to enhance production, exploring underwater areas, or finding space rocks made of metal more...

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SM 25x350 [2xM8] / N42 - magnetic roller

magnetic separator

catalog number 130350

GTIN: 5906301812982

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diameter Ø

25 mm [±0,1 mm]

height

350 mm [±0,1 mm]

max. temperature

≤ 80 °C

984.00 PLN gross price (including VAT) / pcs +

800.00 PLN net price + 23% VAT / pcs

bulk discounts:

need more quantity?

price from 1 pcs
800.00 PLN
984.00 PLN
price from 3 pcs
760.00 PLN
934.80 PLN
price from 6 pcs
720.00 PLN
885.60 PLN

Want a better price?

Call us tel: +48 888 99 98 98 or get in touch through form on our website. You can check the mass and the appearance of neodymium magnets in our force calculator magnetic calculator

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

Specification: magnetic separator 25x350 [2xM8] / N42

Characteristics: magnetic separator 25x350 [2xM8] / N42
Properties
Values
catalog number
130350
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
85059029
diameter Ø
25 mm [±0,1 mm]
height
350 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 - 13 nabiegunników
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
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, which are welded in a construction made of stainless steel usually AISI304. In this way, it is possible to effectively segregate ferromagnetic particles from the mixture. A key aspect of its operation is the use of repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be attracted. The thickness of the magnet and its structure's pitch affect the power and range of the separator's operation.
Generally speaking, magnetic separators serve to separate ferromagnetic particles. If the cans are ferromagnetic, the separator will be able to separate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not effectively segregate them.
Yes, magnetic rollers find application in food production for the elimination of metallic contaminants, including iron fragments or iron dust. Our rollers are made from durable acid-resistant steel, EN 1.4301, suitable for use in food.
Magnetic rollers, otherwise magnetic separators, are used in food production, metal separation as well as waste processing. They help in eliminating iron dust during the process of separating metals from other wastes.
Our magnetic rollers consist of a neodymium magnet anchored in a stainless steel tube cylinder 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 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 materials, N42 and N52.
Generally it is believed that the stronger the magnet, the better. Nevertheless, 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.
If the magnet is more flat, the magnetic force lines are short. By contrast, when the magnet is thick, the force lines are extended and reach further.
For constructing the casings of magnetic separators - rollers, frequently stainless steel is used, particularly types AISI 304, AISI 316, and AISI 316L.
In a salt water contact, type AISI 316 steel is recommended due to its outstanding corrosion resistance.
Magnetic rollers stand out for their specific arrangement of poles and their capability to attract magnetic particles directly onto their surface, in contrast to other devices that may utilize more complicated filtration systems.
Technical designations and terms related to magnetic separators comprise among others magnet pitch, polarity, and magnetic induction, 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, seeking 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 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 higher cost compared to other types of magnets and the need for regular maintenance.
For proper maintenance of neodymium magnetic rollers, it is suggested {to clean them regularly from contaminants, avoid extremal temperatures up to 80°C, and to clean them regularly, avoiding temperatures above 80 degrees. The rollers our rollers have an IP67 waterproof rating, so if they are not watertight, the magnets inside may rust and weaken. Roller inspections are suggested to be conducted once every 24 months. 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.

Find suggested articles

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to immense strength, 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 highly resistant to demagnetization by external magnetic field,
  • In other words, thanks to the shiny nickel, gold, or silver finish, the element gains an visually attractive appearance,
  • They have very high magnetic induction on the surface of the magnet,
  • By using an appropriate combination of materials, they can achieve high thermal resistance, allowing them to operate at temperatures up to 230°C and above...
  • The ability for precise shaping and customization to specific needs – neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of their possible uses.
  • Significant importance in advanced technologically fields – are utilized in HDD drives, electric motors, medical devices or very modern machines.

Disadvantages of neodymium magnets:

  • They can break as they are extremely fragile when subjected to a strong impact. If the magnets are exposed to impacts, it is suggested 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,
  • 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,
  • 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,
  • Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
  • Possible danger arising from small pieces of magnets are risky, when accidentally ingested, which is particularly important in the context of children's health. Furthermore, tiny parts of these magnets are able to be problematic in medical diagnosis in case of swallowing.

Exercise Caution with Neodymium Magnets

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 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.

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

Neodymium magnets are the strongest magnets ever invented. Their power can surprise 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.

Neodymium magnets can become demagnetized 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.

Neodymium magnets are not recommended for people with pacemakers.

Neodymium magnets generate strong magnetic fields. As a result, they interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

Neodymium magnets are highly delicate, they easily break as well as can crumble.

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 collision between the magnets, small sharp metal fragments 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.

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

 It is essential to maintain neodymium magnets out of reach from youngest children.

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.

Keep neodymium magnets as far away as possible from GPS and smartphones.

Strong fields generated by neodymium magnets interfere with compasses and magnetometers 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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

To illustrate why neodymium magnets are so dangerous, read the article - How very dangerous are powerful neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98