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neodymium magnets

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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN: 5906301811930

5.00

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

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

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
properties values
Cat. no. 020473
GTIN 5906301811930
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
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 ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / N38 - lamellar magnet
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

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

Engineering analysis of the product - technical parameters

Presented values constitute the outcome of a mathematical simulation. Values rely on models for the material NdFeB. Actual conditions may deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MPL 50x20x5 / N38
Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 1977 Gs
197.7 mT
12.69 kg / 12690.0 g
124.5 N
crushing
1 mm 1885 Gs
188.5 mT
11.53 kg / 11530.3 g
113.1 N
crushing
2 mm 1772 Gs
177.2 mT
10.20 kg / 10199.9 g
100.1 N
crushing
3 mm 1649 Gs
164.9 mT
8.83 kg / 8831.3 g
86.6 N
warning
5 mm 1395 Gs
139.5 mT
6.32 kg / 6320.3 g
62.0 N
warning
10 mm 870 Gs
87.0 mT
2.46 kg / 2459.4 g
24.1 N
warning
15 mm 549 Gs
54.9 mT
0.98 kg / 976.9 g
9.6 N
low risk
20 mm 359 Gs
35.9 mT
0.42 kg / 418.9 g
4.1 N
low risk
30 mm 172 Gs
17.2 mT
0.10 kg / 95.7 g
0.9 N
low risk
50 mm 54 Gs
5.4 mT
0.01 kg / 9.5 g
0.1 N
low risk
Table 2: Sliding Hold (Wall)
MPL 50x20x5 / N38
Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 2.54 kg / 2538.0 g
24.9 N
1 mm Stal (~0.2) 2.31 kg / 2306.0 g
22.6 N
2 mm Stal (~0.2) 2.04 kg / 2040.0 g
20.0 N
3 mm Stal (~0.2) 1.77 kg / 1766.0 g
17.3 N
5 mm Stal (~0.2) 1.26 kg / 1264.0 g
12.4 N
10 mm Stal (~0.2) 0.49 kg / 492.0 g
4.8 N
15 mm Stal (~0.2) 0.20 kg / 196.0 g
1.9 N
20 mm Stal (~0.2) 0.08 kg / 84.0 g
0.8 N
30 mm Stal (~0.2) 0.02 kg / 20.0 g
0.2 N
50 mm Stal (~0.2) 0.00 kg / 2.0 g
0.0 N
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 50x20x5 / N38
Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 3807.0 g
37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 2538.0 g
24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 1269.0 g
12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 6345.0 g
62.2 N
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 50x20x5 / N38
Steel thickness (mm) % power Real pull force (kg)
0.5 mm
5%
0.63 kg / 634.5 g
6.2 N
1 mm
13%
1.59 kg / 1586.3 g
15.6 N
2 mm
25%
3.17 kg / 3172.5 g
31.1 N
5 mm
63%
7.93 kg / 7931.2 g
77.8 N
10 mm
100%
12.69 kg / 12690.0 g
124.5 N
Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 50x20x5 / N38
Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 12.69 kg / 12690.0 g
124.5 N
OK
40 °C -2.2% 12.41 kg / 12410.8 g
121.8 N
OK
60 °C -4.4% 12.13 kg / 12131.6 g
119.0 N
80 °C -6.6% 11.85 kg / 11852.5 g
116.3 N
100 °C -28.8% 9.04 kg / 9035.3 g
88.6 N
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 50x20x5 / N38
Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 24.10 kg / 24097 g
236.4 N
3 371 Gs
N/A
1 mm 23.06 kg / 23059 g
226.2 N
3 868 Gs
20.75 kg / 20753 g
203.6 N
~0 Gs
2 mm 21.89 kg / 21894 g
214.8 N
3 769 Gs
19.71 kg / 19705 g
193.3 N
~0 Gs
3 mm 20.65 kg / 20654 g
202.6 N
3 661 Gs
18.59 kg / 18589 g
182.4 N
~0 Gs
5 mm 18.07 kg / 18065 g
177.2 N
3 424 Gs
16.26 kg / 16259 g
159.5 N
~0 Gs
10 mm 12.00 kg / 12002 g
117.7 N
2 790 Gs
10.80 kg / 10801 g
106.0 N
~0 Gs
20 mm 4.67 kg / 4670 g
45.8 N
1 741 Gs
4.20 kg / 4203 g
41.2 N
~0 Gs
50 mm 0.37 kg / 368 g
3.6 N
488 Gs
0.33 kg / 331 g
3.2 N
~0 Gs
Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x20x5 / N38
Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Table 8: Dynamics (cracking risk) - warning
MPL 50x20x5 / N38
Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.68 km/h
(5.74 m/s)
0.62 J
30 mm 32.28 km/h
(8.97 m/s)
1.51 J
50 mm 41.50 km/h
(11.53 m/s)
2.49 J
100 mm 58.67 km/h
(16.30 m/s)
4.98 J
Table 9: Coating parameters (durability)
MPL 50x20x5 / N38
Technical parameter Value / Description
Coating type [NiCuNi] Nickel
Layer structure Nickel - Copper - Nickel
Layer thickness 10-20 µm
Salt spray test (SST) ? 24 h
Recommended environment Indoors only (dry)
Table 10: Design data (Pc)
MPL 50x20x5 / N38
Parameter Value Jedn. SI / Opis
Strumień (Flux) 20 792 Mx 207.9 µWb
Współczynnik Pc 0.21 Niski (Płaski)
Table 11: Submerged application
MPL 50x20x5 / N38
Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 kg Buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Montaż na Ścianie (Ześlizg)

*Uwaga: Na pionowej ścianie magnes utrzyma tylko ok. 20-30% tego co na suficie.

2. Wpływ Grubości Blachy

*Cienka blacha (np. obudowa PC 0.5mm) drastycznie osłabia magnes.

3. Wytrzymałość Temperaturowa

*Dla materiału N38 granica bezpieczeństwa to 80°C.

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Force (Pull)

Magnetic Induction
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Elektronika

Trzymaj z dala od dysków HDD, kart płatniczych i telefonów.

Rozruszniki Serca

Osoby z rozrusznikiem muszą zachować dystans min. 10 cm.

Nie dla dzieci

Ryzyko połknięcia. Połknięcie dwóch magnesów grozi śmiercią.

Kruchy materiał

Magnes to ceramika! Uderzenie o inny magnes spowoduje odpryski.

Do czego użyć tego magnesu?

Sprawdzone zastosowania dla wymiaru 15x10x2 mm

Elektronika i Czujniki

Idealny jako element wyzwalający dla czujników Halla oraz kontaktronów w systemach alarmowych. Płaski kształt (2mm) pozwala na ukrycie go w wąskich szczelinach obudowy.

Modelarstwo i Druk 3D

Stosowany do tworzenia niewidocznych zamknięć w modelach drukowanych 3D. Można go wprasować w wydruk lub wkleić w kieszeń zaprojektowaną w modelu CAD.

Meble i Fronty

Używany jako "domykacz" lekkich drzwiczek szafkowych, gdzie standardowe magnesy meblowe są za grube. Wymaga wklejenia w płytkie podfrezowanie.

Other deals

Component MPL 50x20x5 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 124.48 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x20x5 / 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.
They constitute a key element in the production of wind generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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 12.69 kg (force ~124.48 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • In other words, due to the metallic layer of gold, the element gains a professional look,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • In view of the option of precise molding and adaptation to custom solutions, NdFeB magnets can be created in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Key role in modern industrial fields – they are utilized in magnetic memories, electric drive systems, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets and proposals for their use:

  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Best holding force of the magnet in ideal parameterswhat affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

  • using a sheet made of mild steel, acting as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • with a surface cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, including (from most important):

  • Distance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.

Pros as well as cons of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They feature excellent resistance to magnetic field loss when exposed to opposing magnetic fields,
  • In other words, due to the metallic layer of gold, the element gains a professional look,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • In view of the option of precise molding and adaptation to custom solutions, NdFeB magnets can be created in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Key role in modern industrial fields – they are utilized in magnetic memories, electric drive systems, advanced medical instruments, and industrial machines.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets and proposals for their use:

  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • We suggest a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complicated shapes.
  • Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Best holding force of the magnet in ideal parameterswhat affects it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

  • using a sheet made of mild steel, acting as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • with a surface cleaned and smooth
  • without the slightest air gap between the magnet and steel
  • under vertical force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Holding efficiency impacted by specific conditions, including (from most important):

  • Distance – the presence of foreign body (rust, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
  • Chemical composition of the base – mild steel gives the best results. Alloy steels decrease magnetic permeability and holding force.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet’s surface and the plate reduces the holding force.

Warnings

Demagnetization risk

Do not overheat. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, inquire about HT versions (H, SH, UH).

Compass and GPS

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can permanently damage the sensors in your phone.

Eye protection

Protect your eyes. Magnets can fracture upon uncontrolled impact, launching shards into the air. Eye protection is mandatory.

Safe operation

Handle with care. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Combustion hazard

Dust created during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Metal Allergy

It is widely known that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact and select encased magnets.

Danger to the youngest

Neodymium magnets are not toys. Eating several magnets may result in them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Electronic hazard

Powerful magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Physical harm

Big blocks can break fingers instantly. Do not put your hand between two attracting surfaces.

Medical interference

People with a ICD must maintain an absolute distance from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Danger!

Details about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98