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MPL 50x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020166

GTIN/EAN: 5906301811725

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

150 g

Magnetization Direction

↑ axial

Load capacity

42.18 kg / 413.81 N

Magnetic Induction

478.99 mT / 4790 Gs

Coating

[NiCuNi] Nickel

technical details »

47.32 ZŁ with VAT / pcs + price for transport

38.47 ZŁ net + 23% VAT / pcs

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Specifications as well as form of neodymium magnets can be checked on our force calculator.

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Technical - MPL 50x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020166
GTIN/EAN 5906301811725
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 20 mm [±0,1 mm]
Weight 150 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.18 kg / 413.81 N
Magnetic Induction ~ ? 478.99 mT / 4790 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x20 / N38 - lamellar magnet
properties values units
remenance Br [min. - max.] ? 12.2-12.6 kGs
remenance Br [min. - max.] ? 1220-1260 mT
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 10-6 °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 magnet - report

Presented information are the outcome of a engineering analysis. Results are based on algorithms for the material Nd2Fe14B. Actual conditions may deviate from the simulation results. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs distance) - power drop
MPL 50x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4789 Gs
478.9 mT
 42.18 kg / 92.99 lbs
42180.0 g / 413.8 N
 crushing
1 mm 4452 Gs
445.2 mT
 36.46 kg / 80.38 lbs
36461.5 g / 357.7 N
 crushing
2 mm 4114 Gs
411.4 mT
 31.13 kg / 68.62 lbs
31126.5 g / 305.4 N
 crushing
3 mm 3784 Gs
378.4 mT
 26.34 kg / 58.06 lbs
26336.3 g / 258.4 N
 crushing
5 mm 3173 Gs
317.3 mT
 18.52 kg / 40.84 lbs
18523.4 g / 181.7 N
 crushing
10 mm 2022 Gs
202.2 mT
 7.52 kg / 16.59 lbs
7522.9 g / 73.8 N
 medium risk
15 mm 1324 Gs
132.4 mT
 3.22 kg / 7.10 lbs
3222.6 g / 31.6 N
 medium risk
20 mm 899 Gs
89.9 mT
 1.49 kg / 3.28 lbs
1487.5 g / 14.6 N
 weak grip
30 mm 458 Gs
45.8 mT
 0.39 kg / 0.85 lbs
385.8 g / 3.8 N
 weak grip
50 mm 159 Gs
15.9 mT
 0.05 kg / 0.10 lbs
46.4 g / 0.5 N
 weak grip
Magnetic force drops significantly per each millimeter of gap. Note that even a microscopic distance (e.g., dirt, paint, dust) strongly diminishes the holding power. Magnets hold strongest in perfect adhesion; distance nullifies the power. Observe how quickly the pull force fall, when the magnet does not touch directly to the steel surface. When designing the mounting, discard additional spacers.

Table 2: Shear force (vertical surface)
MPL 50x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.44 kg / 18.60 lbs
8436.0 g / 82.8 N
1 mm Stal (~0.2) 7.29 kg / 16.08 lbs
7292.0 g / 71.5 N
2 mm Stal (~0.2) 6.23 kg / 13.73 lbs
6226.0 g / 61.1 N
3 mm Stal (~0.2) 5.27 kg / 11.61 lbs
5268.0 g / 51.7 N
5 mm Stal (~0.2) 3.70 kg / 8.17 lbs
3704.0 g / 36.3 N
10 mm Stal (~0.2) 1.50 kg / 3.32 lbs
1504.0 g / 14.8 N
15 mm Stal (~0.2) 0.64 kg / 1.42 lbs
644.0 g / 6.3 N
20 mm Stal (~0.2) 0.30 kg / 0.66 lbs
298.0 g / 2.9 N
30 mm Stal (~0.2) 0.08 kg / 0.17 lbs
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
This section indicates the theoretical holding capacity required to start the shifting of the magnet downwards against a upright steel plate (considering typical friction coefficient). This value is a function of the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 50x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.65 kg / 27.90 lbs
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 lbs
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 lbs
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 lbs
21090.0 g / 206.9 N
When mounting a magnet on a vertical surface (e.g., a fridge), it will maintain only about 1/5 of nominal attraction strength. Gravity as well as a low friction coefficient cause that magnets slip easier than they detach. Want to create a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will slide down under a much lighter cargo. Application of an anti-slip coating can effectively increase the grip.

Table 4: Material efficiency (substrate influence) - power losses
MPL 50x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.11 kg / 4.65 lbs
2109.0 g / 20.7 N
1 mm
13%
 5.27 kg / 11.62 lbs
5272.5 g / 51.7 N
2 mm
25%
 10.55 kg / 23.25 lbs
10545.0 g / 103.4 N
3 mm
38%
 15.82 kg / 34.87 lbs
15817.5 g / 155.2 N
5 mm
63%
 26.36 kg / 58.12 lbs
26362.5 g / 258.6 N
10 mm
100%
 42.18 kg / 92.99 lbs
42180.0 g / 413.8 N
11 mm
100%
 42.18 kg / 92.99 lbs
42180.0 g / 413.8 N
12 mm
100%
 42.18 kg / 92.99 lbs
42180.0 g / 413.8 N
A thin metal plate is not enough to absorb the entire magnetic field, which weakens actual performance of the magnet. Should you install a neodymium to a weak sheet, the magnetism will pass right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you need a suitably thick backing of metal. The saturation effect causes that on thin elements (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel cross-section based on the following data.

Table 5: Working in heat (stability) - thermal limit
MPL 50x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.18 kg / 92.99 lbs
42180.0 g / 413.8 N
 OK
40 °C -2.2% 41.25 kg / 90.95 lbs
41252.0 g / 404.7 N
 OK
60 °C -4.4% 40.32 kg / 88.90 lbs
40324.1 g / 395.6 N
 OK
80 °C -6.6% 39.40 kg / 86.85 lbs
39396.1 g / 386.5 N
100 °C -28.8% 30.03 kg / 66.21 lbs
30032.2 g / 294.6 N
Standard neodymium magnets lose strength past the thermal threshold. Watch out for overheating – high temperature can irreversibly damage this product. With every degree above norm, the magnet's power temporarily lowers. Avoid using this magnet close to heaters exceeding its safe range. Ignoring the limit will result in permanent loss of magnetism.
*Engineering note: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 141.37 kg / 311.66 lbs
5 687 Gs
21.21 kg / 46.75 lbs
21205 g / 208.0 N
 N/A
1 mm 131.73 kg / 290.41 lbs
9 245 Gs
19.76 kg / 43.56 lbs
19759 g / 193.8 N
 118.55 kg / 261.37 lbs
~0 Gs
2 mm 122.20 kg / 269.41 lbs
8 904 Gs
18.33 kg / 40.41 lbs
18330 g / 179.8 N
 109.98 kg / 242.47 lbs
~0 Gs
3 mm 113.05 kg / 249.23 lbs
8 564 Gs
16.96 kg / 37.38 lbs
16957 g / 166.4 N
 101.74 kg / 224.31 lbs
~0 Gs
5 mm 96.05 kg / 211.76 lbs
7 894 Gs
14.41 kg / 31.76 lbs
14408 g / 141.3 N
 86.45 kg / 190.58 lbs
~0 Gs
10 mm 62.08 kg / 136.87 lbs
6 347 Gs
9.31 kg / 20.53 lbs
9312 g / 91.4 N
 55.87 kg / 123.18 lbs
~0 Gs
20 mm 25.21 kg / 55.59 lbs
4 045 Gs
3.78 kg / 8.34 lbs
3782 g / 37.1 N
 22.69 kg / 50.03 lbs
~0 Gs
50 mm 2.46 kg / 5.43 lbs
1 264 Gs
0.37 kg / 0.81 lbs
370 g / 3.6 N
 2.22 kg / 4.89 lbs
~0 Gs
60 mm 1.29 kg / 2.85 lbs
916 Gs
0.19 kg / 0.43 lbs
194 g / 1.9 N
 1.16 kg / 2.57 lbs
~0 Gs
70 mm 0.71 kg / 1.58 lbs
681 Gs
0.11 kg / 0.24 lbs
107 g / 1.1 N
 0.64 kg / 1.42 lbs
~0 Gs
80 mm 0.41 kg / 0.91 lbs
518 Gs
0.06 kg / 0.14 lbs
62 g / 0.6 N
 0.37 kg / 0.82 lbs
~0 Gs
90 mm 0.25 kg / 0.55 lbs
402 Gs
0.04 kg / 0.08 lbs
37 g / 0.4 N
 0.22 kg / 0.49 lbs
~0 Gs
100 mm 0.16 kg / 0.34 lbs
318 Gs
0.02 kg / 0.05 lbs
23 g / 0.2 N
 0.14 kg / 0.31 lbs
~0 Gs
Two strong neodymiums attract each other from a wider radius than a magnet and steel setup. Such a system of magnet-to-magnet produces a massive flux and a wider radius of operation. Planning to create a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still large.
*Field value between like poles drops to ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
* Estimates refer to shear force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - warnings
MPL 50x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Mechanical watch 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Powerful magnet radiation poses a large risk to IT equipment as well as pacemakers. These NdFeB products produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MPL 50x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.70 km/h
(5.20 m/s)
 2.02 J
30 mm 29.46 km/h
(8.18 m/s)
 5.02 J
50 mm 37.84 km/h
(10.51 m/s)
 8.29 J
100 mm 53.48 km/h
(14.86 m/s)
 16.55 J
NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can trigger coating fragments or injury to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Corrosion resistance
MPL 50x20x20 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 50x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 46 654 Mx 466.5 µWb
Pc Coefficient 0.63 High (Stable)
Total magnetic flux passing through the magnet pole. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 50x20x20 / N38

Environment Effective steel pull Effect
Air (land) 42.18 kg Standard
Water (riverbed) 48.30 kg
(+6.12 kg buoyancy gain)
+14.5%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Thermal stability

*For N38 grade, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. The solid red line represents the demagnetization curve (material potential), while the dashed blue line is the load line based on the magnet's geometry. The Pc (Permeance Coefficient), also known as the load line slope, is a dimensionless value that describes the relationship between the magnet's shape and its magnetic stability. The intersection of these two lines (the black dot) is the operating point — it determines the actual magnetic flux density generated by the magnet in this specific configuration. A higher Pc value means the magnet is more 'slender' (tall relative to its area), resulting in a higher operating point and better resistance to irreversible demagnetization caused by external fields or temperature. A value of 0.42 is relatively low (typical for flat magnets), meaning the operating point is closer to the 'knee' of the curve — caution is advised when operating at temperatures near the maximum limit to avoid strength loss.

Engineering data and GPSR
Elemental analysis
iron (Fe) 64% – 68%
neodymium (Nd) 29% – 32%
boron (B) 1.1% – 1.2%
dysprosium (Dy) 0.5% – 2.0%
coating (Ni-Cu-Ni) < 0.05%
Environmental data
recyclability (EoL) 100%
recycled raw materials ~10% (pre-cons)
carbon footprint low / zredukowany
waste code (EWC) 16 02 16
Safety card (GPSR)
responsible entity
Dhit sp. z o.o.
ul. Kościuszki 6A, 05-850 Ożarów Mazowiecki
tel: +48 22 499 98 98 | e-mail: bok@dhit.pl
batch number/type
id: 020166-2026
Quick Unit Converter
Magnet pull force
Magnetic Induction
Simply complete a single box, and the tool calculate the rest automatically.

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees premium class connection. As a block magnet with high power (approx. 42.18 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 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 50x20x20 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x20x20 / N38 are the foundation for many industrial devices, such as magnetic separators 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.
For mounting flat magnets MPL 50x20x20 / 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. In practice, this means that this magnet has the greatest attraction force on its main planes (50x20 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 50x20x20 mm, which, at a weight of 150 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 50x20x20 mm and a self-weight of 150 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of neodymium magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (in theory),
  • They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
  • A magnet with a metallic gold surface has better aesthetics,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of exact machining as well as modifying to complex needs,
  • Universal use in high-tech industry – they find application in HDD drives, brushless drives, precision medical tools, and complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of producing threads in the magnet and complicated shapes - preferred is cover - mounting mechanism.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The specified lifting capacity concerns the peak performance, recorded under laboratory conditions, namely:
  • on a base made of mild steel, perfectly concentrating the magnetic flux
  • with a thickness minimum 10 mm
  • with a surface cleaned and smooth
  • without any insulating layer between the magnet and steel
  • under vertical force direction (90-degree angle)
  • in stable room temperature

Magnet lifting force in use – key factors

Bear in mind that the magnet holding will differ influenced by the following factors, starting with the most relevant:
  • Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be wasted into the air.
  • Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Surface structure – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the load capacity.

Warnings
Conscious usage

Use magnets with awareness. Their huge power can shock even experienced users. Stay alert and respect their power.

Magnetic interference

A powerful magnetic field interferes with the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a smartphone to prevent breaking the sensors.

Sensitization to coating

Nickel alert: The nickel-copper-nickel coating contains nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Pinching danger

Big blocks can smash fingers in a fraction of a second. Under no circumstances place your hand betwixt two attracting surfaces.

Implant safety

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Cards and drives

Powerful magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.

Fragile material

Protect your eyes. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Dust explosion hazard

Powder generated during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Thermal limits

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Danger to the youngest

NdFeB magnets are not suitable for play. Swallowing multiple magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates urgent medical intervention.

Attention! More info about hazards in the article: Magnet Safety Guide.