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neodymium magnets

We provide yellow color magnetic Nd2Fe14B - our store's offer. All magnesy neodymowe 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 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

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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 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 extremely powerful rod magnet, composed of durable NdFeB material, which, with dimensions of Ø8x20 mm, guarantees optimal power. This specific item boasts a tolerance of ±0.1mm and industrial build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with impressive force (approx. 8.85 kg), this product is in stock from our warehouse in Poland, ensuring lightning-fast order fulfillment. Furthermore, its Ni-Cu-Ni coating effectively protects it against corrosion in typical operating conditions, ensuring an aesthetic appearance and durability for years.
This model is ideal for building electric motors, advanced Hall effect sensors, and efficient magnetic separators, where field concentration on a small surface counts. Thanks to the pull force of 86.79 N with a weight of only 7.54 g, this rod is indispensable in electronics and wherever every gram matters.
Due to the brittleness of the NdFeB material, we absolutely advise against force-fitting (so-called press-fit), as this risks chipping the coating of this precision component. To ensure long-term durability in industry, specialized industrial adhesives 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 modeling and machine building, where extreme miniaturization with maximum force is not required. If you need even stronger magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our store.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 20 mm. The value of 86.79 N means that the magnet is capable of holding a weight many times exceeding its own mass of 7.54 g. The product has a [NiCuNi] coating, which protects the surface against external factors, giving it an aesthetic, silvery shine.
This rod magnet is magnetized axially (along the height of 20 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 and weaknesses of NdFeB magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

  • They retain magnetic properties for around 10 years – the loss is just ~1% (in theory),
  • They maintain their magnetic properties even under strong external field,
  • A magnet with a shiny silver surface has an effective appearance,
  • Magnets have huge magnetic induction on the surface,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Thanks to flexibility in shaping and the capacity to adapt to specific needs,
  • Universal use in electronics industry – they are used in mass storage devices, motor assemblies, medical devices, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Drawbacks and weaknesses of neodymium magnets: application proposals

  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited ability of creating threads in the magnet and complex forms - preferred is casing - mounting mechanism.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnetwhat contributes to it?

The load parameter shown refers to the peak performance, measured under ideal test conditions, specifically:

  • on a base made of mild steel, effectively closing the magnetic flux
  • possessing a massiveness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • under conditions of ideal adhesion (metal-to-metal)
  • under vertical application of breakaway force (90-degree angle)
  • at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

Real force impacted by working environment parameters, mainly (from priority):

  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with neodymium magnets

Safe operation

Handle with care. Rare earth magnets act from a long distance and connect with huge force, often faster than you can move away.

Fragile material

Neodymium magnets are ceramic materials, which means they are fragile like glass. Collision of two magnets will cause them cracking into shards.

Danger to pacemakers

For implant holders: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Protect data

Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Nickel coating and allergies

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and wear gloves.

This is not a toy

Adult use only. Small elements pose a choking risk, leading to intestinal necrosis. Store out of reach of children and animals.

Demagnetization risk

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its properties and strength.

Mechanical processing

Dust generated during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Crushing risk

Large magnets can crush fingers in a fraction of a second. Do not put your hand between two attracting surfaces.

Threat to navigation

Navigation devices and smartphones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Danger!

Need more info? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98