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neodymium magnets

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MPL 5x5x1.2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020171

GTIN: 5906301811770

5

length [±0,1 mm]

5 mm

Width [±0,1 mm]

5 mm

Height [±0,1 mm]

1.2 mm

Weight

0.23 g

Magnetization Direction

↑ axial

Load capacity

0.47 kg / 4.61 N

Magnetic Induction

245.17 mT

Coating

[NiCuNi] nickel

0.1845 with VAT / pcs + price for transport

0.1500 ZŁ net + 23% VAT / pcs

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Lifting power and structure of neodymium magnets can be tested with our online calculation tool.

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MPL 5x5x1.2 / N38 - lamellar magnet

Specification/characteristics MPL 5x5x1.2 / N38 - lamellar magnet
properties
values
Cat. no.
020171
GTIN
5906301811770
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
5 mm [±0,1 mm]
Width
5 mm [±0,1 mm]
Height
1.2 mm [±0,1 mm]
Weight
0.23 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
0.47 kg / 4.61 N
Magnetic Induction ~ ?
245.17 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

Magnetic plates offer a flat shape, which makes them easy to mount. Model MPL 5x5x1.2 / N38 is made of strong sintered NdFeB, which guarantees powerful pull force of 0.47 kg while maintaining a small thickness. The rectangular form is ideal for machine construction, cabinet closures, and sticking to flat surfaces. Additionally, they are secured by a durable Ni-Cu-Ni anti-corrosion coating.
Separating block magnets should be done by sliding them apart, rather than pulling them apart forcefully. Try sliding one magnet off the edge until the force decreases. We recommend caution, because magnets can snap back together, which is dangerous. For large blocks, it is worth using a wooden wedge for leverage. Important: never try to pry them with metal tools, as you can damage the brittle material.
Block magnets are the foundation for many technical solutions. They are used to build filters catching filings, linear motors, and also in the furniture industry as hidden locks. Due to their shape, they can be mounted to walls, casings, or tools using double-sided tape. Customers also buy them for organizing workshops and in DIY projects.
Yes, neodymium magnets can be placed one on top of another. Combining two magnets with attracting poles will increase the magnetic field, although it won't be exactly x2 (depending on dimensions). This allows you to build a more powerful system without buying a new, thicker block. However, be careful to watch your fingers during joining, as the attraction force can be very strong.
For mounting flat magnets, we recommend using strong epoxy glues, such as epoxy resin. They guarantee a permanent bond with metal and are safe for the coating. For lighter applications, branded foam tape can be used. Before gluing clean the magnet with alcohol, which will increase the bond strength.
Standard block magnets are magnetized through the thickness. This means, the N and S poles are on the largest flat surfaces. This provides the highest holding capacity when attached flat. There are unusual versions magnetized through the length or width, which we can import for specialized sensors.

Advantages and disadvantages of neodymium magnets NdFeB.

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

  • Their magnetic field remains stable, and after around ten years, it drops only by ~1% (according to research),
  • They show exceptional resistance to demagnetization from outside magnetic sources,
  • Thanks to the glossy finish and nickel coating, they have an elegant appearance,
  • Magnetic induction on the surface of these magnets is impressively powerful,
  • These magnets tolerate high temperatures, often exceeding 230°C, when properly designed (in relation to form),
  • Thanks to the freedom in shaping and the capability to adapt to specific requirements, neodymium magnets can be created in different geometries, which broadens their usage potential,
  • Important function in advanced technical fields – they are utilized in HDDs, rotating machines, clinical machines and other advanced devices,
  • Thanks to their efficiency per volume, small magnets offer high magnetic performance, while occupying minimal space,

Disadvantages of magnetic elements:

  • They may fracture when subjected to a strong impact. If the magnets are exposed to shocks, they should be placed in a metal holder. The steel housing, in the form of a holder, protects the magnet from fracture , and at the same time reinforces its overall durability,
  • High temperatures may significantly reduce the field efficiency of neodymium magnets. Typically, above 80°C, they experience permanent decline in performance (depending on size). 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,
  • Magnets exposed to damp air can degrade. Therefore, for outdoor applications, we advise waterproof types made of rubber,
  • Limited ability to create complex details in the magnet – the use of a mechanical support is recommended,
  • Safety concern linked to microscopic shards may arise, especially if swallowed, which is significant in the family environments. Furthermore, miniature parts from these products have the potential to disrupt scanning after being swallowed,
  • High unit cost – neodymium magnets are pricier than other types of magnets (e.g., ferrite), which increases the cost of large-scale applications

Maximum lifting capacity of the magnetwhat affects it?

The given strength of the magnet represents the optimal strength, measured in the best circumstances, that is:

  • using a steel plate with low carbon content, acting as a magnetic circuit closure
  • having a thickness of no less than 10 millimeters
  • with a polished side
  • with zero air gap
  • under perpendicular detachment force
  • at room temperature

Lifting capacity in real conditions – factors

Practical lifting force is dependent on elements, listed from the most critical to the less significant:

  • Air gap between the magnet and the plate, because even a very small distance (e.g. 0.5 mm) causes 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 plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap {between} the magnet’s surface and the plate reduces the lifting capacity.

Precautions

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 swellings.

Magnets will jump and also clash together within a radius of several to around 10 cm from each other.

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

Neodymium magnets are a source of intense magnetic fields that cause interference with magnetometers and compasses used in navigation, as well as internal compasses of smartphones and GPS devices.

Dust and powder from neodymium magnets are 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.

Neodymium magnets are delicate as well as can easily break and shatter.

In the event of a collision between two neodymium magnets, it can result in them getting chipped. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. At the moment of connection between the magnets, tiny sharp metal pieces can be propelled in various directions at high speed. Eye protection is recommended.

Keep neodymium magnets away from people with pacemakers.

Neodymium magnets generate very strong magnetic fields that can interfere with the operation of a pacemaker. This happens because such devices have a function to deactivate them in a magnetic field.

  Do not give neodymium magnets to children.

Remember that neodymium magnets are not toys. Be cautious and make sure no child plays with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

If you have a nickel allergy, avoid contact with neodymium magnets.

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, try wearing gloves or avoid direct contact with nickel-plated neodymium magnets.

Keep neodymium magnets away from the wallet, computer, and TV.

Neodymium magnets generate strong magnetic fields that can damage 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. Do not forget to keep neodymium magnets away from these electronic devices.

Neodymium magnets can demagnetize at high temperatures.

Although magnets are generally resilient, their ability to retain their magnetic strength can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

Comparing neodymium magnets to ferrite magnets (found in speakers), they are 10 times stronger, and their power can shock you.

To use magnets properly, it is best to familiarize yourself with our information beforehand. This will help you avoid significant harm to your body and the magnets themselves.

Be careful!

In order to illustrate why neodymium magnets are so dangerous, read the article - How very dangerous are very powerful neodymium magnets?.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98