e-mail: bok@dhit.pl

neodymium magnets

We provide blue color magnetic Nd2Fe14B - our proposal. Practically all "neodymium magnets" on our website are available for immediate delivery (see the list). Check out the magnet pricing for more details see the magnet price list

Magnets for water searching F300 GOLD

Where to buy very strong neodymium magnet? Magnetic holders in solid and airtight steel casing are ideally suited for use in variable and difficult weather conditions, including during snow and rain read

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Holders with magnets can be used to facilitate production processes, underwater exploration, or finding meteorites from gold see more...

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Dhit sp. z o.o.
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MW 5x30 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010088

GTIN: 5906301810872

5

Diameter Ø

5 mm [±0,1 mm]

Height

30 mm [±0,1 mm]

Weight

4.42 g

Magnetization Direction

↑ axial

Load capacity

8.29 kg / 81.3 N

Magnetic Induction

616.32 mT

Coating

[NiCuNi] nickel

3.57 with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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Contact us by phone +48 22 499 98 98 alternatively send us a note by means of request form our website.
Lifting power and form of magnets can be checked with our magnetic mass calculator.

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MW 5x30 / N38 - cylindrical magnet
Specification/characteristics MW 5x30 / N38 - cylindrical magnet
properties
values
Cat. no.
010088
GTIN
5906301810872
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
5 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
4.42 g
Magnetization Direction
↑ axial
Load capacity ~ ?
8.29 kg / 81.3 N
Magnetic Induction ~ ?
616.32 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
±0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
coercivity bHc ?
10.8-11.5
kOe
coercivity bHc ?
860-915
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
energy density [Min. - Max.] ?
287-303
BH max KJ/m
max. temperature ?
≤ 80
°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

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

Shopping tips

This product is a very strong cylindrical magnet, made from advanced NdFeB material, which, with dimensions of Ø5x30 mm, guarantees the highest energy density. The MW 5x30 / N38 component boasts a tolerance of ±0.1mm and professional build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 8.29 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, guaranteeing an aesthetic appearance and durability for years.
It successfully proves itself in modeling, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the pull force of 81.3 N with a weight of only 4.42 g, this rod is indispensable in electronics and wherever low weight is crucial.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this professional component. To ensure stability in automation, anaerobic resins are used, which are safe for nickel and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for industrial neodymium magnets, offering an optimal price-to-power ratio and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø5x30), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard available off-the-shelf in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 5 mm and height 30 mm. The value of 81.3 N means that the magnet is capable of holding a weight many times exceeding its own mass of 4.42 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
Standardly, the magnetic axis runs through the center of the cylinder, causing the greatest attraction force to occur on the bases with a diameter of 5 mm. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Advantages and disadvantages of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

  • They do not lose magnetism, even during nearly ten years – the reduction in lifting capacity is only ~1% (according to tests),
  • They are extremely resistant to demagnetization induced by external disturbances,
  • A magnet with a shiny nickel surface has an effective appearance,
  • Magnets are characterized by extremely high magnetic induction on the working surface,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in forming and the capacity to modify to unusual requirements,
  • Fundamental importance in electronics industry – they are commonly used in data components, electromotive mechanisms, precision medical tools, also complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited ability of making threads in the magnet and complicated forms - preferred is casing - magnet mounting.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can complicate diagnosis medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Holding force of 8.29 kg is a measurement result conducted under standard conditions:

  • on a plate made of structural steel, effectively closing the magnetic flux
  • with a cross-section of at least 10 mm
  • characterized by smoothness
  • under conditions of gap-free contact (surface-to-surface)
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Key elements affecting lifting force

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:

  • Distance – the presence of foreign body (paint, tape, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Steel thickness – insufficiently thick plate does not accept the full field, causing part of the flux to be wasted into the air.
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface structure – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.

Warnings

Threat to electronics

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.

Danger to pacemakers

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Powerful field

Use magnets consciously. Their immense force can shock even experienced users. Be vigilant and respect their power.

Demagnetization risk

Do not overheat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Sensitization to coating

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness happens, immediately stop working with magnets and wear gloves.

Material brittleness

NdFeB magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets will cause them cracking into small pieces.

Finger safety

Risk of injury: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Do not give to children

Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

GPS and phone interference

Be aware: neodymium magnets produce a field that disrupts precision electronics. Keep a separation from your mobile, device, and navigation systems.

Do not drill into magnets

Fire warning: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Warning!

Need more info? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98