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neodymium magnets

We offer red color magnetic Nd2Fe14B - our store's offer. All "neodymium magnets" on our website are available for immediate delivery (check the list). See the magnet price list for more details see the magnet price list

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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN: 5906301811565

5

length [±0,1 mm]

40 mm

Width [±0,1 mm]

10 mm

Height [±0,1 mm]

4 mm

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

6.32 kg / 61.98 N

Magnetic Induction

275.57 mT

Coating

[NiCuNi] nickel

4.87 with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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MPL 40x10x4 / N38 - lamellar magnet
Specification/characteristics MPL 40x10x4 / N38 - lamellar magnet
properties
values
Cat. no.
020150
GTIN
5906301811565
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g [±0,1 mm]
Magnetization Direction
↑ axial
Load capacity ~ ?
6.32 kg / 61.98 N
Magnetic Induction ~ ?
275.57 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

Model MPL 40x10x4 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 61.98 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is shifting the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 40x10x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x10x4 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 40x10x4 / N38 model is magnetized axially (dimension 4 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x10 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 40x10x4 mm, which, at a weight of 12 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x10x4 mm and a self-weight of 12 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

  • They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a smooth gold surface has an effective appearance,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Due to the ability of flexible shaping and customization to custom needs, magnetic components can be manufactured in a broad palette of geometric configurations, which increases their versatility,
  • Huge importance in modern industrial fields – they serve a role in computer drives, electromotive mechanisms, advanced medical instruments, as well as modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in creating nuts and complicated shapes in magnets, we recommend using casing - magnetic mount.
  • Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum magnetic pulling forcewhat affects it?

The declared magnet strength concerns the maximum value, measured under ideal test conditions, specifically:

  • using a plate made of high-permeability steel, acting as a circuit closing element
  • whose thickness equals approx. 10 mm
  • with an ground contact surface
  • without any air gap between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

In practice, the actual lifting capacity is determined by many variables, ranked from the most important:

  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be lost to the other side.
  • Metal type – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature influence – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate decreases the load capacity.

Safe handling of NdFeB magnets

Protective goggles

Despite the nickel coating, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Threat to electronics

Avoid bringing magnets near a purse, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Precision electronics

Remember: neodymium magnets generate a field that disrupts precision electronics. Maintain a separation from your mobile, tablet, and GPS.

Respect the power

Handle with care. Neodymium magnets act from a distance and snap with huge force, often quicker than you can react.

Mechanical processing

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

No play value

These products are not toys. Swallowing a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates urgent medical intervention.

Demagnetization risk

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Nickel coating and allergies

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

Medical interference

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Finger safety

Large magnets can smash fingers instantly. Never place your hand betwixt two attracting surfaces.

Danger!

More info about risks in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98