e-mail: bok@dhit.pl

neodymium magnets

We provide blue color magnetic Nd2Fe14B - our offer. All magnesy neodymowe on our website are available for immediate purchase (check the list). Check out the magnet price list for more details check the magnet price list

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MW 20x5 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010044

GTIN: 5906301810438

5

Diameter Ø

20 mm [±0,1 mm]

Height

5 mm [±0,1 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

bulk discounts:

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price from 1 pcs
4.52 ZŁ
5.56 ZŁ
price from 150 pcs
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5.23 ZŁ
price from 600 pcs
3.98 ZŁ
4.89 ZŁ

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Force as well as appearance of a neodymium magnet can be verified with our modular calculator.

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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
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

The presented product is an incredibly powerful cylinder magnet, composed of advanced NdFeB material, which, at dimensions of Ø20x5 mm, guarantees the highest energy density. This specific item features high dimensional repeatability and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 5.53 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Additionally, its triple-layer Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
This model is created for building generators, advanced sensors, and efficient magnetic separators, where maximum induction on a small surface counts. Thanks to the high power of 54.23 N with a weight of only 11.78 g, this cylindrical magnet 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 professional 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.
Magnets N38 are suitable for the majority of applications in automation and machine building, where extreme miniaturization with maximum force is not required. 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 available off-the-shelf in our store.
This model is characterized by dimensions Ø20x5 mm, which, at a weight of 11.78 g, makes it an element with high magnetic energy density. The key parameter here is the lifting capacity amounting to approximately 5.53 kg (force ~54.23 N), which, with such compact dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 5 mm), which means that the N and S poles are located on the flat, circular surfaces. 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 neodymium magnets.

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:

  • They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
  • Magnets effectively resist against loss of magnetization caused by external fields,
  • The use of an metallic finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets deliver maximum magnetic induction on a small area, which allows for strong attraction,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed modeling and optimizing to individual applications,
  • Universal use in innovative solutions – they are utilized in computer drives, brushless drives, medical equipment, as well as other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in compact constructions

Cons of neodymium magnets: tips and applications.

  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also raises their durability
  • We warn that neodymium magnets can reduce 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Due to limitations in realizing nuts and complicated shapes in magnets, we propose using cover - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these magnets can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price exceeds standard values,

Best holding force of the magnet in ideal parameterswhat affects it?

The declared magnet strength represents the maximum value, recorded under optimal environment, meaning:

  • on a block made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • with a surface cleaned and smooth
  • with direct contact (without impurities)
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Determinants of lifting force in real conditions

Please note that the application force will differ influenced by elements below, in order of importance:

  • Air gap (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, corrosion or dirt).
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Plate material – mild steel gives the best results. Higher carbon content decrease magnetic permeability and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, however under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Swallowing risk

Only for adults. Tiny parts can be swallowed, causing intestinal necrosis. Store away from children and animals.

Handling guide

Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.

Finger safety

Danger of trauma: The attraction force is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.

Skin irritation risks

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, prevent direct skin contact or choose versions in plastic housing.

Operating temperature

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

Dust is flammable

Powder produced during cutting of magnets is flammable. Do not drill into magnets unless you are an expert.

Health Danger

For implant holders: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Compass and GPS

Remember: rare earth magnets produce a field that disrupts precision electronics. Maintain a safe distance from your mobile, tablet, and GPS.

Material brittleness

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Protect data

Equipment safety: Strong magnets can damage payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Caution!

Need more info? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98