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neodymium magnets

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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN: 5906301811930

5

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.49 kg / 122.49 N

Magnetic Induction

197.73 mT

Coating

[NiCuNi] nickel

14.56 with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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MPL 50x20x5 / N38 - lamellar magnet
Specification/characteristics MPL 50x20x5 / N38 - lamellar magnet
properties
values
Cat. no.
020473
GTIN
5906301811930
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Load capacity ~ ?
12.49 kg / 122.49 N
Magnetic Induction ~ ?
197.73 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 50x20x5 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. As a block magnet with high power (approx. 12.49 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding 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. Watch your fingers! Magnets with a force of 12.49 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 12.49 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x20x5 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x20x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 12.49 kg (force ~122.49 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

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

  • They virtually do not lose strength, because even after ten years the performance loss is only ~1% (according to literature),
  • They retain their magnetic properties even under external field action,
  • A magnet with a shiny nickel surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to versatility in forming and the ability to adapt to complex applications,
  • Key role in electronics industry – they are commonly used in magnetic memories, electric motors, precision medical tools, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

  • Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex shapes.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. Additionally, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Magnetic strength at its maximum – what affects it?

Information about lifting capacity was defined for the most favorable conditions, assuming:

  • using a base made of low-carbon steel, serving as a ideal flux conductor
  • with a cross-section of at least 10 mm
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • under perpendicular application of breakaway force (90-degree angle)
  • at room temperature

Lifting capacity in real conditions – factors

In practice, the actual holding force depends on many variables, presented from most significant:

  • Space between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Chemical composition of the base – mild steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Smoothness – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under shearing force the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate lowers the load capacity.

Warnings

Shattering risk

Neodymium magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them cracking into small pieces.

Dust is flammable

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

Pacemakers

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Allergic reactions

A percentage of the population suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Extended handling might lead to an allergic reaction. We suggest wear safety gloves.

Safe operation

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their force.

Data carriers

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.

This is not a toy

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

Serious injuries

Big blocks can break fingers instantly. Never put your hand betwixt two attracting surfaces.

Threat to navigation

Be aware: rare earth magnets produce a field that confuses precision electronics. Maintain a separation from your mobile, tablet, and navigation systems.

Heat sensitivity

Standard neodymium magnets (grade N) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Attention!

Looking for details? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98