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neodymium magnets

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MW 9x3 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010108

GTIN: 5906301811077

5

Diameter Ø [±0,1 mm]

9 mm

Height [±0,1 mm]

3 mm

Weight

1.43 g

Magnetization Direction

↑ axial

Load capacity

1.49 kg / 14.61 N

Magnetic Induction

343.55 mT

Coating

[NiCuNi] nickel

1.132 with VAT / pcs + price for transport

0.920 ZŁ net + 23% VAT / pcs

bulk discounts:

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MW 9x3 / N38 - cylindrical magnet
Specification/characteristics MW 9x3 / N38 - cylindrical magnet
properties
values
Cat. no.
010108
GTIN
5906301811077
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
9 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
1.43 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
1.49 kg / 14.61 N
Magnetic Induction ~ ?
343.55 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

The offered product is an exceptionally strong rod magnet, composed of durable NdFeB material, which, with dimensions of Ø9x3 mm, guarantees maximum efficiency. This specific item boasts high dimensional repeatability and industrial build quality, making it a perfect solution for professional engineers and designers. As a cylindrical magnet with impressive force (approx. 1.49 kg), this product is available off-the-shelf from our European logistics center, ensuring rapid order fulfillment. Moreover, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is perfect for building generators, advanced sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the high power of 14.61 N with a weight of only 1.43 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, you must not use force-fitting (so-called press-fit), as this risks immediate cracking of this precision component. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most frequently chosen standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need even stronger magnets in the same volume (Ø9x3), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
This model is characterized by dimensions Ø9x3 mm, which, at a weight of 1.43 g, makes it an element with high magnetic energy density. The value of 14.61 N means that the magnet is capable of holding a weight many times exceeding its own mass of 1.43 g. The product has a [NiCuNi] coating, which secures it against oxidation, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 3 mm), which means that the N and S poles are located on the flat, circular surfaces. Thanks to this, the magnet can be easily glued into a hole and achieve a strong field on the front surface. On request, we can also produce versions magnetized diametrically if your project requires it.

Strengths as well as weaknesses of rare earth magnets.

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

  • They do not lose power, even over approximately 10 years – the reduction in power is only ~1% (based on measurements),
  • They show high resistance to demagnetization induced by external disturbances,
  • By using a decorative coating of gold, the element has an modern look,
  • Magnetic induction on the surface of the magnet is very high,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Considering the ability of accurate forming and customization to specialized solutions, magnetic components can be modeled in a broad palette of geometric configurations, which makes them more universal,
  • Key role in modern technologies – they are commonly used in hard drives, electric motors, medical devices, also modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: application proposals

  • Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing threads and complex forms in magnets, we recommend using casing - magnetic mechanism.
  • Possible danger to health – tiny shards of magnets are risky, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
  • Due to complex production process, their price exceeds standard values,

Detachment force of the magnet in optimal conditionswhat affects it?

Information about lifting capacity was defined for optimal configuration, including:

  • with the use of a sheet made of special test steel, ensuring maximum field concentration
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

Please note that the application force may be lower influenced by elements below, starting with the most relevant:

  • Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Direction of force – highest force is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – too thin steel causes magnetic saturation, causing part of the flux to be wasted to the other side.
  • Material type – the best choice is high-permeability steel. Hardened steels may have worse magnetic properties.
  • Surface quality – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Electronic devices

Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Respect the power

Handle magnets consciously. Their powerful strength can shock even experienced users. Plan your moves and do not underestimate their power.

Operating temperature

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Dust is flammable

Machining of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Hand protection

Protect your hands. Two large magnets will join instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Fragile material

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Health Danger

People with a pacemaker should keep an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.

No play value

Product intended for adults. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Magnetic interference

Remember: neodymium magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and navigation systems.

Metal Allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If redness happens, cease working with magnets and wear gloves.

Caution!

Details about hazards in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98