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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

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Physical properties - 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

Technical analysis of the assembly - technical parameters

These values constitute the direct effect of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static 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 LBS
42180.0 g / 413.8 N
critical level
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
critical level
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
critical level
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
critical level
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
critical level
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
low risk
30 mm 458 Gs
45.8 mT
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
low risk
50 mm 159 Gs
15.9 mT
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
low risk

Table 2: Shear capacity (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

Table 3: Wall mounting (sliding) - 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

Table 4: Material efficiency (saturation) - sheet metal selection
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

Table 5: Thermal resistance (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 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

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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

Table 7: Protective zones (electronics) - precautionary measures
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
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

Table 8: Collisions (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

Table 9: Coating parameters (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: Electrical 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: Submerged application
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: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely ~20% of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Heat tolerance

*For N38 material, 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

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.

Engineering data and GPSR
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%
Ecology and recycling (GPSR)
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
Pulling force

Field Strength

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Component MPL 50x20x20 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 413.81 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 42.18 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 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x20x20 / N38, it is best to use 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.
Standardly, the MPL 50x20x20 / N38 model is magnetized through the thickness (dimension 20 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 20 mm (width), and 20 mm (thickness). 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.

Pros as well as cons of neodymium magnets.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
  • Neodymium magnets are extremely resistant to magnetic field loss caused by external magnetic fields,
  • In other words, due to the aesthetic surface of gold, the element gains visual value,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the ability to modify to specific needs,
  • Universal use in advanced technology sectors – they find application in hard drives, electromotive mechanisms, precision medical tools, as well as technologically advanced constructions.
  • Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited possibility of producing nuts in the magnet and complicated shapes - recommended is casing - magnetic holder.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Holding force characteristics

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

The lifting capacity listed is a measurement result conducted under the following configuration:
  • using a sheet made of high-permeability steel, serving as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • with an polished contact surface
  • with direct contact (no impurities)
  • under axial force direction (90-degree angle)
  • at room temperature

Determinants of practical lifting force of a magnet

Holding efficiency impacted by working environment parameters, including (from priority):
  • Clearance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets
Conscious usage

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

Health Danger

For implant holders: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Permanent damage

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Crushing risk

Pinching hazard: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

No play value

These products are not suitable for play. Accidental ingestion of multiple magnets may result in them attracting across intestines, which poses a severe health hazard and requires urgent medical intervention.

Keep away from electronics

A powerful magnetic field negatively affects the operation of compasses in phones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.

Data carriers

Intense magnetic fields can erase data on credit cards, HDDs, and storage devices. Keep a distance of min. 10 cm.

Material brittleness

NdFeB magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Machining danger

Machining of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, avoid touching magnets with bare hands or select versions in plastic housing.

Safety First! Details about hazards in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98