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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

47.32 with VAT / pcs + price for transport

38.47 ZŁ net + 23% VAT / pcs

bulk discounts:

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Technical of the product - 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

Physical modeling of the product - report

The following data are the result of a engineering simulation. Results are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - 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 pounds
42180.0 g / 413.8 N
crushing
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
crushing
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
crushing
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
crushing
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
crushing
10 mm 2022 Gs
202.2 mT
7.52 kg / 16.59 pounds
7522.9 g / 73.8 N
medium risk
15 mm 1324 Gs
132.4 mT
3.22 kg / 7.10 pounds
3222.6 g / 31.6 N
medium risk
20 mm 899 Gs
89.9 mT
1.49 kg / 3.28 pounds
1487.5 g / 14.6 N
low risk
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
low risk
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
low risk

Table 2: Slippage load (wall)
MPL 50x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
1 mm Stal (~0.2) 7.29 kg / 16.08 pounds
7292.0 g / 71.5 N
2 mm Stal (~0.2) 6.23 kg / 13.73 pounds
6226.0 g / 61.1 N
3 mm Stal (~0.2) 5.27 kg / 11.61 pounds
5268.0 g / 51.7 N
5 mm Stal (~0.2) 3.70 kg / 8.17 pounds
3704.0 g / 36.3 N
10 mm Stal (~0.2) 1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
15 mm Stal (~0.2) 0.64 kg / 1.42 pounds
644.0 g / 6.3 N
20 mm Stal (~0.2) 0.30 kg / 0.66 pounds
298.0 g / 2.9 N
30 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N

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 pounds
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 pounds
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 pounds
21090.0 g / 206.9 N

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 pounds
2109.0 g / 20.7 N
1 mm
13%
5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
2 mm
25%
10.55 kg / 23.25 pounds
10545.0 g / 103.4 N
3 mm
38%
15.82 kg / 34.87 pounds
15817.5 g / 155.2 N
5 mm
63%
26.36 kg / 58.12 pounds
26362.5 g / 258.6 N
10 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
11 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
12 mm
100%
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N

Table 5: Working in heat (stability) - power drop
MPL 50x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
OK
40 °C -2.2% 41.25 kg / 90.95 pounds
41252.0 g / 404.7 N
OK
60 °C -4.4% 40.32 kg / 88.90 pounds
40324.1 g / 395.6 N
OK
80 °C -6.6% 39.40 kg / 86.85 pounds
39396.1 g / 386.5 N
100 °C -28.8% 30.03 kg / 66.21 pounds
30032.2 g / 294.6 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 141.37 kg / 311.66 pounds
5 687 Gs
21.21 kg / 46.75 pounds
21205 g / 208.0 N
N/A
1 mm 131.73 kg / 290.41 pounds
9 245 Gs
19.76 kg / 43.56 pounds
19759 g / 193.8 N
118.55 kg / 261.37 pounds
~0 Gs
2 mm 122.20 kg / 269.41 pounds
8 904 Gs
18.33 kg / 40.41 pounds
18330 g / 179.8 N
109.98 kg / 242.47 pounds
~0 Gs
3 mm 113.05 kg / 249.23 pounds
8 564 Gs
16.96 kg / 37.38 pounds
16957 g / 166.4 N
101.74 kg / 224.31 pounds
~0 Gs
5 mm 96.05 kg / 211.76 pounds
7 894 Gs
14.41 kg / 31.76 pounds
14408 g / 141.3 N
86.45 kg / 190.58 pounds
~0 Gs
10 mm 62.08 kg / 136.87 pounds
6 347 Gs
9.31 kg / 20.53 pounds
9312 g / 91.4 N
55.87 kg / 123.18 pounds
~0 Gs
20 mm 25.21 kg / 55.59 pounds
4 045 Gs
3.78 kg / 8.34 pounds
3782 g / 37.1 N
22.69 kg / 50.03 pounds
~0 Gs
50 mm 2.46 kg / 5.43 pounds
1 264 Gs
0.37 kg / 0.81 pounds
370 g / 3.6 N
2.22 kg / 4.89 pounds
~0 Gs
60 mm 1.29 kg / 2.85 pounds
916 Gs
0.19 kg / 0.43 pounds
194 g / 1.9 N
1.16 kg / 2.57 pounds
~0 Gs
70 mm 0.71 kg / 1.58 pounds
681 Gs
0.11 kg / 0.24 pounds
107 g / 1.1 N
0.64 kg / 1.42 pounds
~0 Gs
80 mm 0.41 kg / 0.91 pounds
518 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
0.37 kg / 0.82 pounds
~0 Gs
90 mm 0.25 kg / 0.55 pounds
402 Gs
0.04 kg / 0.08 pounds
37 g / 0.4 N
0.22 kg / 0.49 pounds
~0 Gs
100 mm 0.16 kg / 0.34 pounds
318 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
0.14 kg / 0.31 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - 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
Timepiece 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Car key 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

Table 8: Dynamics (cracking risk) - collision effects
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

Table 9: Anti-corrosion coating durability
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)

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

Parameter Value SI Unit / Description
Magnetic Flux 46 654 Mx 466.5 µWb
Pc Coefficient 0.63 High (Stable)

Table 11: Underwater work (magnet fishing)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Note: On a vertical wall, the magnet retains merely ~20% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.

3. Thermal stability

*For N38 material, the max working temp is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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.

Technical and environmental data
Material specification
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
Magnet Unit Converter
Magnet pull force

Field Strength

Other offers

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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x20x20 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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. Thanks to the flat surface and high force (approx. 42.18 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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 50x20x20 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 and disadvantages of rare earth magnets.

Pros

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for around 10 years – the loss is just ~1% (according to analyses),
  • They possess excellent resistance to magnetism drop due to external magnetic sources,
  • In other words, due to the aesthetic finish of silver, the element becomes visually attractive,
  • Neodymium magnets create maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Due to the possibility of flexible shaping and adaptation to individualized solutions, neodymium magnets can be produced in a broad palette of forms and dimensions, which increases their versatility,
  • Wide application in advanced technology sectors – they find application in mass storage devices, drive modules, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • NdFeB magnets demagnetize 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 very resistant to heat
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • Due to complex production process, their price is relatively high,

Lifting parameters

Detachment force of the magnet in optimal conditionswhat contributes to it?

Holding force of 42.18 kg is a theoretical maximum value performed under the following configuration:
  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ground touching surface
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • in neutral thermal conditions

Determinants of practical lifting force of a magnet

Effective lifting capacity is influenced by working environment parameters, including (from most important):
  • Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.

Safety rules for work with NdFeB magnets
Operating temperature

Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.

Bodily injuries

Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!

Nickel coating and allergies

Some people suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use safety gloves.

Threat to navigation

Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Protective goggles

Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

Danger to pacemakers

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.

Product not for children

Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep away from children and animals.

Keep away from computers

Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Immense force

Be careful. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.

Fire warning

Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Warning! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98