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MPL 50x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020166

GTIN/EAN: 5906301811725

5.00
Load capacity 42.18 kg / 413.81 N Magnetic Induction 478.99 mT / 4790 Gs
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
150 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

38.47net / pcs

47.32 zł with VAT (23% VAT) / pcs

price for transport

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Quantity
Net
Gross
price from 1 pcs
38.47 zł
47.32 zł
price from 20 pcs
36.16 zł
44.48 zł
price from 70 pcs
33.85 zł
41.64 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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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 310 °C
Curie Temperature TF 590 °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 product - technical parameters

The following information represent the direct effect of a mathematical calculation. Values rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - interaction chart
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
dangerous!
1 mm 4452 Gs
445.2 mT
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
dangerous!
2 mm 4114 Gs
411.4 mT
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
dangerous!
3 mm 3784 Gs
378.4 mT
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
dangerous!
5 mm 3173 Gs
317.3 mT
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
dangerous!
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 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 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 (shearing) - vertical pull
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: Steel thickness (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

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) Sliding 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

Table 7: Hazards (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
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: Impact energy (kinetic energy) - collision effects
MPL 50x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.74 km/h
(5.21 m/s)
2.03 J
30 mm 20.65 km/h
(5.74 m/s)
2.47 J
50 mm 20.78 km/h
(5.77 m/s)
2.50 J
100 mm 20.80 km/h
(5.78 m/s)
2.50 J

Table 9: Surface protection spec
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 (Flux)
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Heat tolerance

*For N38 grade, 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

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.

Technical and environmental data

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
Magnet Unit Converter

Pulling force


Magnetic Field

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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. This magnetic 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.
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, 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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. 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 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 product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:
  • They do not lose power, even after approximately ten years – the drop in lifting capacity is only ~1% (according to tests),
  • Magnets perfectly resist against loss of magnetization caused by external fields,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the working part of the magnet is exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures approaching 230°C and above...
  • Thanks to flexibility in forming and the capacity to adapt to unusual requirements,
  • Wide application in modern technologies – they find application in data components, motor assemblies, diagnostic systems, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which allows their use in compact constructions

Disadvantages

Disadvantages of neodymium magnets:
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength 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 when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated shapes.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Pull force analysis

Maximum lifting capacity of the magnetwhat contributes to it?

Magnet power was defined for the most favorable conditions, assuming:
  • using a base made of mild steel, functioning as a circuit closing element
  • with a cross-section no less than 10 mm
  • with an ground contact surface
  • with zero gap (no coatings)
  • for force acting at a right angle (in the magnet axis)
  • at standard ambient temperature

Determinants of practical lifting force of a magnet

It is worth knowing that the magnet holding may be lower influenced by elements below, starting with the most relevant:
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Steel thickness – too thin steel does not accept the full field, causing part of the power to be wasted into the air.
  • Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as 75%. In addition, even a slight gap between the magnet’s surface and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets
Material brittleness

Protect your eyes. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Choking Hazard

Always store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.

Threat to navigation

A strong magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.

Cards and drives

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.

Powerful field

Use magnets consciously. Their huge power can surprise even professionals. Stay alert and do not underestimate their force.

Metal Allergy

Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands or choose encased magnets.

Permanent damage

Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

Finger safety

Big blocks can break fingers instantly. Never put your hand betwixt two strong magnets.

Pacemakers

For implant holders: Strong magnetic fields disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Mechanical processing

Drilling and cutting of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Attention! Looking for details? Check our post: Why are neodymium magnets dangerous?