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neodymium magnets

We provide red color magnetic Nd2Fe14B - our proposal. All magnesy in our store are in stock for immediate purchase (see the list). See the magnet pricing for more details see the magnet price list

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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5

Diameter Ø [±0,1 mm]

20 mm

Height [±0,1 mm]

5 mm

Weight

11.78 g

Magnetization Direction

↑ axial

Load capacity

5.53 kg / 54.23 N

Magnetic Induction

277.16 mT

Coating

[NiCuNi] nickel

5.56 with VAT / pcs + price for transport

4.52 ZŁ net + 23% VAT / pcs

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MW 20x5 / N38 - cylindrical magnet
Specification/characteristics MW 20x5 / N38 - cylindrical magnet
properties
values
Cat. no.
010044
GTIN
5906301810438
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
5.53 kg / 54.23 N
Magnetic Induction ~ ?
277.16 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 an incredibly powerful rod magnet, manufactured from modern NdFeB material, which, at dimensions of Ø20x5 mm, guarantees the highest energy density. This specific item is characterized by high dimensional repeatability and industrial build quality, making it an ideal solution for the most demanding engineers and designers. As a cylindrical magnet with impressive force (approx. 5.53 kg), this product is available off-the-shelf from our warehouse in Poland, ensuring rapid order fulfillment. Furthermore, its triple-layer Ni-Cu-Ni coating shields it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
It successfully proves itself in DIY projects, advanced automation, and broadly understood industry, serving as a fastening or actuating element. Thanks to the pull force of 54.23 N with a weight of only 11.78 g, this rod is indispensable in miniature devices and wherever low weight is crucial.
Due to the delicate structure of the ceramic sinter, you must not use force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in automation, specialized industrial adhesives are used, which are safe for nickel and fill the gap, guaranteeing high repeatability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and operational stability. If you need the strongest magnets in the same volume (Ø20x5), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 20 mm and height 5 mm. The value of 54.23 N means that the magnet is capable of holding a weight many times exceeding its own mass of 11.78 g. The product has a [NiCuNi] coating, which protects the surface 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 20 mm. 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 through the diameter if your project requires it.

Pros as well as cons of rare earth magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • Their power is durable, and after around ten years it decreases only by ~1% (theoretically),
  • They are noted for resistance to demagnetization induced by external disturbances,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They feature high magnetic induction at the operating surface, which improves attraction properties,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Possibility of detailed creating as well as adjusting to specific applications,
  • Significant place in modern industrial fields – they are commonly used in HDD drives, electromotive mechanisms, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which allows their use in miniature devices

Drawbacks and weaknesses of neodymium magnets: tips and applications.

  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend 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 resistant to moisture, in case of application outdoors
  • Limited ability of creating nuts in the magnet and complicated forms - recommended is a housing - magnet mounting.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • Due to neodymium price, their price is relatively high,

Detachment force of the magnet in optimal conditionswhat affects it?

Magnet power is the result of a measurement for optimal configuration, assuming:

  • using a base made of high-permeability steel, acting as a ideal flux conductor
  • with a thickness minimum 10 mm
  • with an polished contact surface
  • with direct contact (without impurities)
  • during pulling in a direction vertical to the plane
  • in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Effective lifting capacity is affected by working environment parameters, mainly (from most important):

  • Gap (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
  • Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
  • Base massiveness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost into the air.
  • Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was determined using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under shearing force the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.

Warnings

Eye protection

NdFeB magnets are ceramic materials, which means they are very brittle. Collision of two magnets will cause them breaking into shards.

Compass and GPS

A strong magnetic field negatively affects the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid damaging the sensors.

ICD Warning

Warning for patients: Strong magnetic fields affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Safe operation

Exercise caution. Neodymium magnets act from a distance and connect with massive power, often faster than you can move away.

Thermal limits

Control the heat. Exposing the magnet to high heat will ruin its properties and pulling force.

Threat to electronics

Equipment safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Fire risk

Dust generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Serious injuries

Pinching hazard: The pulling power is so immense that it can cause hematomas, crushing, and broken bones. Protective gloves are recommended.

Sensitization to coating

A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Extended handling can result in skin redness. We recommend use protective gloves.

No play value

Neodymium magnets are not suitable for play. Eating a few magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates urgent medical intervention.

Security!

Want to know more? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98