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neodymium magnets

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MPL 40x18x10 SH / N38 - lamellar magnet

lamellar magnet

Catalog no 020157

GTIN: 5906301811633

5

length [±0,1 mm]

40 mm

Width [±0,1 mm]

18 mm

Height [±0,1 mm]

10 mm

Weight

54 g

Magnetization Direction

↑ axial

Magnetic Induction

366.66 mT

Coating

[NiCuNi] nickel

36.29 with VAT / pcs + price for transport

29.50 ZŁ net + 23% VAT / pcs

27.50 ZŁ net was the lowest price in the last 30 days

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MPL 40x18x10 SH / N38 - lamellar magnet

Specification/characteristics MPL 40x18x10 SH / N38 - lamellar magnet
properties
values
Cat. no.
020157
GTIN
5906301811633
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
18 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
54 g [±0,1 mm]
Magnetization Direction
↑ axial
Magnetic Induction ~ ?
366.66 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

Block magnets feature a large contact surface, which allows for easy gluing. Model MPL 40x18x10 SH / N38 is made of neodymium material, which ensures powerful pull force of 0 kg while maintaining a small thickness. Their geometric shape is ideal for building separators, furniture systems, and mounting with 3M tape. Additionally, they are protected by a durable Ni-Cu-Ni anti-corrosion coating.
Disconnecting strong flat magnets should be done by shifting one against the other, rather than trying to pull them straight off. Try sliding one magnet to the side until the force decreases. We recommend caution, because magnets can snap back together, which is painful. For large blocks, it is worth using a wooden wedge for leverage. Remember: never try to use a screwdriver, as you can damage the brittle material.
These versatile magnets are the foundation for many industrial devices. They are utilized in magnetic separators, linear motors, and also in the furniture industry as strong closers. Thanks to the flat surface, they are easy to glue to walls, casings, or tools using double-sided tape. They are also popular for hanging tools and in DIY projects.
Yes, neodymium magnets can be stacked. Joining two plates with attracting poles will increase the magnetic field, although it won't double the force (depending on dimensions). This allows you to build a more powerful system without buying a new, thicker block. Just remember to watch your fingers during joining, as sudden snapping can be very strong.
To stick neodymium magnets, we recommend using two-component adhesives, such as UHU Endfest. They ensure a permanent bond with metal and are safe for the coating. For lighter applications, branded foam tape can be used. Before gluing degrease the surface with alcohol, which improves durability.
Most of our blocks are magnetized along the smallest dimension. This means, the N and S poles are on the 'large' sides of the magnet. This ensures the highest holding capacity when attached flat. Rarely, magnets are magnetized through the length or width, which we can import for specialized sensors.

Advantages as well as disadvantages of neodymium magnets NdFeB.

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

  • Their strength remains stable, and after approximately ten years, it drops only by ~1% (theoretically),
  • They are very resistant to demagnetization caused by external field interference,
  • In other words, due to the shiny silver coating, the magnet obtains an stylish appearance,
  • The outer field strength of the magnet shows advanced magnetic properties,
  • Thanks to their high temperature resistance, they can operate (depending on the form) even at temperatures up to 230°C or more,
  • With the option for tailored forming and personalized design, these magnets can be produced in multiple shapes and sizes, greatly improving engineering flexibility,
  • Key role in cutting-edge sectors – they are utilized in HDDs, electromechanical systems, medical equipment along with other advanced devices,
  • Relatively small size with high magnetic force – neodymium magnets offer strong power in tiny dimensions, which makes them ideal in compact constructions

Disadvantages of magnetic elements:

  • They may fracture when subjected to a powerful impact. If the magnets are exposed to physical collisions, it is advisable to use in a steel housing. The steel housing, in the form of a holder, protects the magnet from damage while also reinforces its overall strength,
  • Magnets lose field strength when exposed to temperatures exceeding 80°C. In most cases, this leads to irreversible magnetic decay (influenced by the magnet’s dimensions). To address this, we provide [AH] models with superior thermal resistance, able to operate even at 230°C or more,
  • Magnets exposed to humidity can rust. Therefore, for outdoor applications, we suggest waterproof types made of rubber,
  • Using a cover – such as a magnetic holder – is advised due to the restrictions in manufacturing fine shapes directly in the magnet,
  • Possible threat linked to microscopic shards may arise, if ingested accidentally, which is important in the health of young users. Moreover, tiny components from these products may interfere with diagnostics once in the system,
  • Higher purchase price is one of the drawbacks compared to ceramic magnets, especially in budget-sensitive applications

Magnetic strength at its maximum – what affects it?

The given strength of the magnet corresponds to the optimal strength, determined under optimal conditions, specifically:

  • using a steel plate with low carbon content, serving as a magnetic circuit closure
  • having a thickness of no less than 10 millimeters
  • with a smooth surface
  • with no separation
  • with vertical force applied
  • under standard ambient temperature

What influences lifting capacity in practice

The lifting capacity of a magnet is determined by in practice the following factors, ordered from most important to least significant:

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

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate lowers the holding force.

Safety Precautions

Dust and powder from neodymium magnets are highly flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Neodymium magnets can attract to each other, pinch the skin, and cause significant swellings.

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

Make sure not to bring neodymium magnets close to the TV, wallet, and computer HDD.

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

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

Remember that neodymium magnets are not toys. Do not allow children to play with them. Small magnets can pose a serious 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 among the most powerful magnets on Earth. The astonishing force they generate between each other can shock you.

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional damage to the magnets.

Neodymium magnets are extremely fragile, they easily crack as well as can crumble.

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

Do not bring neodymium magnets close to 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.

The magnet is coated with nickel - be careful if you have an 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 become demagnetized at high temperatures.

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

Pay attention!

In order for you to know how powerful neodymium magnets are and why they are so dangerous, read the article - Dangerous powerful neodymium magnets.

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tel: +48 888 99 98 98