← previous

Product available shipping tomorrow

MW 25x5 / N38AH - cylindrical magnet

cylindrical magnet

Catalog no 010501

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

5 mm

Weight

18.41 g

Magnetization Direction

↑ axial

Load capacity

6.91 kg / 67.76 N

Magnetic Induction

219.99 mT

Coating

[NiCuNi] nickel

16.68 ZŁ with VAT / pcs + price for transport

13.56 ZŁ net + 23% VAT / pcs

bulk discounts:

Need more?

price from 1 pcs

13.56 ZŁ

16.68 ZŁ

price from 50 pcs

12.75 ZŁ

15.68 ZŁ

price from 190 pcs

11.93 ZŁ

14.68 ZŁ

Carbon Footprint – environmental impact GPSR Regulation – product safety

Not sure where to buy?

Call us now +48 888 99 98 98 alternatively let us know via our online form the contact page.
Weight and structure of magnets can be checked with our magnetic calculator.

Orders placed before 14:00 will be shipped the same business day.

MW 25x5 / N38AH - cylindrical magnet

Specification/characteristics MW 25x5 / N38AH - cylindrical magnet

properties

values

Cat. no.

010501

Production/Distribution

Dhit sp. z o.o.

Country of origin

Poland / China / Germany

Customs code

85059029

Diameter Ø

25 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

18.41 g [±0,1 mm]

Magnetization Direction

↑ axial

Load capacity ~ ?

6.91 kg / 67.76 N

Magnetic Induction ~ ?

219.99 mT

Coating

[NiCuNi] nickel

Manufacturing Tolerance

± 0.1 mm

Magnetic properties of material N38AH

properties

values

units

remenance Br [Min. - Max.] ?

12.2-12.5

kGs

remenance Br [Min. - Max.] ?

1120-1250

coercivity bHc ?

≥ 11.3

kOe

coercivity bHc ?

≥ 899

kA/m

actual internal force iHc

≥ 33

kOe

actual internal force iHc

≥ 2624

kA/m

energy density [Min. - Max.] ?

36-39

BH max MGOe

energy density [Min. - Max.] ?

287-310

BH max KJ/m

max. temperature ?

≤ 230

°C

Physical properties of NdFeB

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

Shopping tips

Product available wysyłka jutro!

SM 32x475 [2xM8] / N42 - magnetic separator

1414.50 ZŁ / pcs

Product available wysyłka jutro!

LM TLN - 20 R / N38 - magnetic leviton

400.00 ZŁ / pcs

Product available wysyłka jutro!

MP 10x7/3.5x3 / N38 - ring magnet

0.824 ZŁ / pcs

Product available wysyłka jutro!

SMZR 25x225 / N52 - magnetic separator with handle

615.00 ZŁ / pcs

Neodymium Cylindrical Magnets i.e. MW 25x5 / N38AH are magnets made of neodymium in a cylinder form. They are valued for their extremely powerful magnetic properties, which outperform ordinary iron magnets. Thanks to their strength, they are frequently employed in products that require strong adhesion. The standard temperature resistance of these magnets is 80 degrees C, but for cylindrical magnets, this temperature increases with the growth of the magnet. Additionally, various special coatings, such as nickel, gold, or chrome, are often applied to the surface of neodymium magnets to increase their durability to corrosion. The cylindrical shape is as well very popular among neodymium magnets. The magnet named MW 25x5 / N38AH and a magnetic strength 6.91 kg weighs only 18.41 grams.

Cylindrical neodymium magnets, often referred to as Nd₂Fe₁₄B, represent the strongest known material for magnet production. The technology of their production is complicated and includes melting special neodymium alloys along with other metals such as iron and boron. After appropriate processing, such as heat and mechanical treatment, the magnets are made available for use in varied applications, such as electric motors, audio-video equipment, and in the automotive and aerospace industries.
Moreover, although neodymium is part of the strongest magnets, they are susceptible to corrosion in humid environments. Therefore, they are coated with a coating of nickel to protect them from corrosion. It's worth noting that NdFeB neodymium magnets are about 13% lighter than SmCo magnets and, despite their power, easily break, which requires special caution during their handling. Therefore, any mechanical processing should be done before they are magnetized.

In terms of safety, there are many recommendations regarding the use of these magnets. They should not be used in acidic, basic, organic environments or where solvents are present, as well as in water or oil. Additionally, they can damage data on magnetic cards and hard drives, although data deletion using a neodymium magnet is not guaranteed.

Regarding the purchase of cylindrical neodymium magnets, many companies offer such products. One of the suggested suppliers is our company Dhit, situated in Ożarów Mazowiecki, the address can be found directly in the contact tab. It's always worth visit the site for the current information as well as offers, and before visiting, please call.

Due to their strength, cylindrical neodymium magnets are very practical in many applications, they can also constitute certain risk. Because of their strong magnetic power, they can attract metallic objects with uncontrolled force, which can lead to damaging skin and other surfaces, especially hands. One should not use neodymium magnets near equipment or data storage devices, such as credit cards, as they can damage these devices in terms of magnetic recording. Moreover, neodymium magnets are prone to corrosion in humid environments, thus they are coated with a thin e.g., nickel layer. Generally, although they are very useful, one should handle them carefully.

Neodymium magnets, with the formula Nd₂Fe₁₄B, are currently the very strong magnets on the market. They are produced through a complicated sintering process, which involves fusing specific alloys of neodymium with additional metals and then shaping and thermal processing. Their amazing magnetic strength comes from the specific production technology and chemical composition.
In terms of properties in different environments, neodymium magnets are susceptible to corrosion, especially in humid conditions. Therefore, they are often coated with thin coatings, such as gold, to protect them from external factors and extend their lifespan. Temperatures exceeding 130°C can result in a reduction of their magnetic strength, although there are particular types of neodymium magnets that can tolerate temperatures up to 230°C.
As for risks, it is important to avoid using neodymium magnets in acidic environments, basic conditions, organic or solvent environments, unless they are adequately insulated. Additionally, their use is not recommended in wet conditions, oil, or in an environment containing hydrogen, as they may lose their magnetic properties.

A neodymium magnet in classes N50 and N52 is a powerful and highly strong magnetic product designed as a cylinder, that offers high force and versatile application. Good price, 24h delivery, resistance and versatility.

Advantages and disadvantages of neodymium magnets NdFeB.

Besides their durability, neodymium magnets are valued for these benefits:

They have constant strength, and over nearly 10 years their performance decreases symbolically – ~1% (in testing),
They protect against demagnetization induced by surrounding magnetic fields effectively,
In other words, due to the glossy nickel coating, the magnet obtains an professional appearance,
The outer field strength of the magnet shows remarkable magnetic properties,
Thanks to their exceptional temperature resistance, they can operate (depending on the shape) even at temperatures up to 230°C or more,
Thanks to the possibility in shaping and the capability to adapt to individual requirements, neodymium magnets can be created in diverse shapes and sizes, which increases their application range,
Key role in cutting-edge sectors – they find application in HDDs, electromechanical systems, diagnostic apparatus or even high-tech tools,
Thanks to their efficiency per volume, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of magnetic elements:

They can break when subjected to a strong impact. If the magnets are exposed to mechanical hits, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture and additionally reinforces its overall durability,
They lose power at extreme temperatures. Most neodymium magnets experience permanent degradation in strength when heated above 80°C (depending on the dimensions and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
They rust in a damp environment. If exposed to rain, we recommend using encapsulated magnets, such as those made of rubber,
Using a cover – such as a magnetic holder – is advised due to the difficulty in manufacturing fine shapes directly in the magnet,
Safety concern related to magnet particles may arise, if ingested accidentally, which is notable in the context of child safety. Furthermore, tiny components from these assemblies may hinder health screening when ingested,
Higher purchase price is an important factor to consider compared to ceramic magnets, especially in budget-sensitive applications

Magnetic strength at its maximum – what it depends on?

The given holding capacity of the magnet represents the highest holding force, calculated in the best circumstances, that is:

with mild steel, serving as a magnetic flux conductor
with a thickness of minimum 10 mm
with a polished side
with zero air gap
under perpendicular detachment force
in normal thermal conditions

Determinants of lifting force in real conditions

Practical lifting force is dependent on factors, listed from the most critical to the less significant:

Air gap between the magnet and the plate, since even a very small distance (e.g. 0.5 mm) can cause a drop in lifting force of up to 50%.
Direction of applied force, because the maximum lifting capacity is achieved under perpendicular application. The force required to slide the magnet along the plate is usually several times lower.
Thickness of the plate, as a plate that is too thin causes part of the magnetic flux not to be used and to remain wasted in the air.
Material of the plate, because higher carbon content lowers holding force, while higher iron content increases it. The best choice is steel with high magnetic permeability and high saturation induction.
Surface of the plate, because the more smooth and polished it is, the better the contact and consequently the greater the magnetic saturation.
Operating temperature, since all permanent magnets have a negative temperature coefficient. This means that at high temperatures they are weaker, while at sub-zero temperatures they become slightly stronger.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.

Exercise Caution with Neodymium Magnets

Neodymium magnets should not be near 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.

Dust and powder from neodymium magnets are 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.

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.

Magnets should not be treated as toys. Therefore, it is not recommended for youngest children to have access to them.

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 magnetic are incredibly delicate, they easily break and can crumble.

Neodymium magnets are extremely delicate, and by joining them in an uncontrolled manner, they will crack. Neodymium magnetic are made of metal and coated with a shiny nickel, but they are not as durable as steel. In the event of a collision between two magnets, there may be a scattering of fragments in different directions. Protecting your eyes is crucial in such a situation.

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.

Do not bring neodymium magnets close to GPS and smartphones.

Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.

Neodymium magnets are among the strongest magnets on Earth. The astonishing force they generate between each other can shock you.

Familiarize yourself with our information to properly handle these magnets and avoid significant injuries to your body and prevent disruption to the magnets.

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

Neodymium magnets produce intense magnetic fields that can destroy 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. Do not forget to keep neodymium magnets away from these electronic devices.

Neodymium magnets are primarily characterized by their significant internal force. They attract to each other, and any object that comes in their way will be affected.

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

Be careful!

So that know how strong neodymium magnets are and why they are so dangerous, see the article - Dangerous strong neodymium magnets.