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neodymium magnets

We offer red color magnets Nd2Fe14B - our offer. Practically all "neodymium magnets" in our store are in stock for immediate delivery (see the list). See the magnet pricing for more details see the magnet price list

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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN: 5906301811138

5

Diameter Ø [±0,1 mm]

8 mm

Height [±0,1 mm]

20 mm

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

8.85 kg / 86.79 N

Magnetic Induction

607.01 mT

Coating

[NiCuNi] nickel

4.60 with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

bulk discounts:

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Force and structure of a magnet can be calculated using our online calculation tool.

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MW 8x20 / N38 - cylindrical magnet

Specification/characteristics MW 8x20 / N38 - cylindrical magnet
properties
values
Cat. no.
010475
GTIN
5906301811138
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g [±0,1 mm]
Magnetization Direction
→ diametrical
Load capacity ~ ?
8.85 kg / 86.79 N
Magnetic Induction ~ ?
607.01 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 NdFeB

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

Our cylinder magnets are made of high-performance rare earth material. This ensures high magnetic density while maintaining compact dimensions. Model MW 8x20 / N38 has a pull force of approx. 8.85 kg. Their symmetrical shape makes them perfect for mounting in drilled holes, generators and filters. The surface is protected by a Ni-Cu-Ni (Nickel-Copper-Nickel) coating.
The best and safest method is gluing into a hole with a slightly larger diameter (e.g. +0.1 mm clearance). Use strong epoxy resins, which do not react with the nickel coating. Do not hit the magnets, as neodymium is a brittle material and is prone to chipping upon impact.
The 'N' number indicates the maximum strength of the material. Larger numbers indicate a stronger magnetic field for the same size. The universal option is N38, which provides an optimal price-to-power ratio. For projects requiring extreme strength, we recommend grade N52, which is the strongest commercially available sinter.
Neodymium magnets are coated with a protective layer of Ni-Cu-Ni (Nickel-Copper-Nickel), which protects against air humidity. However, they are not fully waterproof. In outdoor or wet conditions, the coating may be damaged, leading to corrosion and loss of power. For such tasks, we suggest enclosing them in a sealed housing or ordering a special version.
Cylindrical magnets are a key component of many modern machines. They are commonly used to build rotors in brushless motors and in magnetic separators for cleaning bulk products. Additionally, due to their precise dimensions, they are indispensable in Hall effect sensors.
Standard neodymium magnets (grade N) work safely up to 80°C. Higher temperatures can cause irreversible demagnetization. For more demanding conditions (e.g. 120°C, 150°C, 200°C), ask about high-temperature versions (H, SH, UH). Please note that magnets are sensitive to rapid temperature changes.

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • They show strong resistance to demagnetization from outside magnetic sources,
  • By applying a reflective layer of nickel, the element gains a clean look,
  • Magnetic induction on the surface of these magnets is notably high,
  • These magnets tolerate elevated temperatures, often exceeding 230°C, when properly designed (in relation to build),
  • The ability for accurate shaping or customization to specific needs – neodymium magnets can be manufactured in multiple variants of geometries, which extends the scope of their use cases,
  • Key role in cutting-edge sectors – they are utilized in computer drives, rotating machines, clinical machines as well as other advanced devices,
  • Compactness – despite their small size, they deliver powerful magnetism, making them ideal for precision applications

Disadvantages of magnetic elements:

  • They may fracture when subjected to a sudden impact. If the magnets are exposed to external force, it is suggested to place them in a protective enclosure. The steel housing, in the form of a holder, protects the magnet from cracks and additionally increases its overall strength,
  • High temperatures may significantly reduce the holding force of neodymium magnets. Typically, above 80°C, they experience permanent loss in performance (depending on height). To prevent this, we offer heat-resistant magnets marked [AH], capable of working up to 230°C, which makes them perfect for high-temperature use,
  • Due to corrosion risk in humid conditions, it is common to use sealed magnets made of protective material for outdoor use,
  • The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is restricted,
  • Safety concern related to magnet particles may arise, if ingested accidentally, which is significant in the context of child safety. Additionally, miniature parts from these assemblies have the potential to disrupt scanning once in the system,
  • Due to a complex production process, their cost is above average,

Detachment force of the magnet in optimal conditionswhat it depends on?

The given lifting capacity of the magnet represents the maximum lifting force, measured under optimal conditions, specifically:

  • with mild steel, serving as a magnetic flux conductor
  • of a thickness of at least 10 mm
  • with a polished side
  • with zero air gap
  • with vertical force applied
  • at room temperature

Magnet lifting force in use – key factors

The lifting capacity of a magnet is influenced by in practice key elements, from primary to secondary:

  • Air gap between the magnet and the plate, as 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.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the load capacity.

Exercise Caution with Neodymium Magnets

Neodymium magnetic are delicate as well as can easily crack as well as get damaged.

Neodymium magnets are characterized by significant fragility. Neodymium magnets are made of metal and coated with a shiny nickel surface, but they are not as hard as steel. At the moment of connection between the magnets, sharp metal fragments can be dispersed in different directions.

Keep neodymium magnets away 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 videos, televisions, CRT computer monitors. Remember not to place neodymium magnets close to these electronic devices.

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

Neodymium magnets are not toys. Be cautious and make sure no child plays with them. They can be a significant choking hazard. If multiple magnets are swallowed, they can attract to each other through the intestinal walls, causing significant injuries, and even death.

Neodymium magnets are the most powerful magnets ever created, and their power can shock you.

Make sure to review all the information we have provided. This will help you avoid harm to your body and damage to the magnets.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This is because many of these devices are equipped with a function that deactivates the device in a magnetic field.

Neodymium magnets can demagnetize at high temperatures.

In certain circumstances, Neodymium magnets can lose their magnetism when subjected to high temperatures.

Keep neodymium magnets as far away as possible from GPS and smartphones.

Neodymium magnets produce intense magnetic fields that interfere with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

The magnet coating contains nickel, so be cautious if you have a nickel allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as 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.

Neodymium magnets can attract to each other due to their immense internal force, causing the skin and other body parts to get pinched and resulting in significant injuries.

Neodymium magnets bounce and also clash mutually within a radius of several to around 10 cm from each other.

Dust and powder from neodymium magnets are highly 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.

Caution!

To raise awareness of why neodymium magnets are so dangerous, see the article titled How very dangerous are very strong neodymium magnets?.

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e-mail: bok@dhit.pl

tel: +48 888 99 98 98