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MPL 50x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020165

GTIN/EAN: 5906301811718

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

75 g

Magnetization Direction

↑ axial

Load capacity

29.99 kg / 294.15 N

Magnetic Induction

337.18 mT / 3372 Gs

Coating

[NiCuNi] Nickel

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43.05 ZŁ with VAT / pcs + price for transport

35.00 ZŁ net + 23% VAT / pcs

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Specifications as well as appearance of neodymium magnets can be estimated on our power calculator.

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Technical of the product - MPL 50x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020165
GTIN/EAN 5906301811718
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 10 mm [±0,1 mm]
Weight 75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 29.99 kg / 294.15 N
Magnetic Induction ~ ? 337.18 mT / 3372 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x10 / 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 magnet - report

The following values constitute the direct effect of a physical calculation. Values rely on models for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Please consider these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - interaction chart
MPL 50x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3371 Gs
337.1 mT
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
 crushing
1 mm 3158 Gs
315.8 mT
 26.32 kg / 58.03 LBS
26323.3 g / 258.2 N
 crushing
2 mm 2932 Gs
293.2 mT
 22.69 kg / 50.02 LBS
22687.6 g / 222.6 N
 crushing
3 mm 2703 Gs
270.3 mT
 19.29 kg / 42.52 LBS
19286.7 g / 189.2 N
 crushing
5 mm 2266 Gs
226.6 mT
 13.55 kg / 29.86 LBS
13546.3 g / 132.9 N
 crushing
10 mm 1419 Gs
141.9 mT
 5.31 kg / 11.71 LBS
5313.0 g / 52.1 N
 medium risk
15 mm 908 Gs
90.8 mT
 2.17 kg / 4.79 LBS
2174.5 g / 21.3 N
 medium risk
20 mm 603 Gs
60.3 mT
 0.96 kg / 2.12 LBS
961.0 g / 9.4 N
 safe
30 mm 296 Gs
29.6 mT
 0.23 kg / 0.51 LBS
231.0 g / 2.3 N
 safe
50 mm 97 Gs
9.7 mT
 0.02 kg / 0.05 LBS
24.8 g / 0.2 N
 safe
Magnetic force weakens significantly with every mm of distance. Keep in mind that even a very thin break (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets hold most effectively during direct contact; distance nullifies the power. Notice how rapidly the load capacity fall, when the product does not touch tightly to the metal substrate. When calculating the arrangement, discard unnecessary gaps.

Table 2: Sliding hold (vertical surface)
MPL 50x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
1 mm Stal (~0.2) 5.26 kg / 11.61 LBS
5264.0 g / 51.6 N
2 mm Stal (~0.2) 4.54 kg / 10.00 LBS
4538.0 g / 44.5 N
3 mm Stal (~0.2) 3.86 kg / 8.51 LBS
3858.0 g / 37.8 N
5 mm Stal (~0.2) 2.71 kg / 5.97 LBS
2710.0 g / 26.6 N
10 mm Stal (~0.2) 1.06 kg / 2.34 LBS
1062.0 g / 10.4 N
15 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
20 mm Stal (~0.2) 0.19 kg / 0.42 LBS
192.0 g / 1.9 N
30 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The table below shows the estimated holding capacity required to start the downward movement of the magnet downwards on a upright steel wall (assuming typical friction coefficient). This parameter is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 50x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
9.00 kg / 19.83 LBS
8997.0 g / 88.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.00 kg / 6.61 LBS
2999.0 g / 29.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
15.00 kg / 33.06 LBS
14995.0 g / 147.1 N
When hanging a holder on a vertical wall (e.g., a board), it will only hold barely about 20%-30% of its nominal power. Gravity and a weak degree of grip mean that products slide down easier than they pull off. Designing a vertical fastening? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the element will slide down under a noticeably lighter cargo. Application of an anti-slip pad can effectively increase the grip.

Table 4: Steel thickness (saturation) - power losses
MPL 50x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.50 kg / 3.31 LBS
1499.5 g / 14.7 N
1 mm
13%
 3.75 kg / 8.26 LBS
3748.8 g / 36.8 N
2 mm
25%
 7.50 kg / 16.53 LBS
7497.5 g / 73.6 N
3 mm
38%
 11.25 kg / 24.79 LBS
11246.3 g / 110.3 N
5 mm
63%
 18.74 kg / 41.32 LBS
18743.8 g / 183.9 N
10 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
11 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
12 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
A thin metal plate is incapable of conduct the full magnetic flux, which weakens actual performance of the holder. Should you install a neodymium to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To achieve the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the product holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - power drop
MPL 50x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
 OK
40 °C -2.2% 29.33 kg / 64.66 LBS
29330.2 g / 287.7 N
 OK
60 °C -4.4% 28.67 kg / 63.21 LBS
28670.4 g / 281.3 N
80 °C -6.6% 28.01 kg / 61.75 LBS
28010.7 g / 274.8 N
100 °C -28.8% 21.35 kg / 47.07 LBS
21352.9 g / 209.5 N
Ordinary NdFeB products lose parameters above the temperature limit. Avoid high temperatures – excessive heat can irreversibly damage this product. With increasing heat, the magnet's power momentarily lowers. Refrain from using this product close to heaters higher than its working range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 50x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 70.06 kg / 154.45 LBS
4 789 Gs
10.51 kg / 23.17 LBS
10509 g / 103.1 N
 N/A
1 mm 65.83 kg / 145.13 LBS
6 535 Gs
9.87 kg / 21.77 LBS
9874 g / 96.9 N
 59.25 kg / 130.61 LBS
~0 Gs
2 mm 61.49 kg / 135.57 LBS
6 316 Gs
9.22 kg / 20.34 LBS
9224 g / 90.5 N
 55.34 kg / 122.01 LBS
~0 Gs
3 mm 57.20 kg / 126.10 LBS
6 092 Gs
8.58 kg / 18.92 LBS
8580 g / 84.2 N
 51.48 kg / 113.49 LBS
~0 Gs
5 mm 48.94 kg / 107.89 LBS
5 635 Gs
7.34 kg / 16.18 LBS
7341 g / 72.0 N
 44.05 kg / 97.10 LBS
~0 Gs
10 mm 31.64 kg / 69.76 LBS
4 531 Gs
4.75 kg / 10.46 LBS
4747 g / 46.6 N
 28.48 kg / 62.79 LBS
~0 Gs
20 mm 12.41 kg / 27.36 LBS
2 838 Gs
1.86 kg / 4.10 LBS
1862 g / 18.3 N
 11.17 kg / 24.63 LBS
~0 Gs
50 mm 1.07 kg / 2.35 LBS
832 Gs
0.16 kg / 0.35 LBS
160 g / 1.6 N
 0.96 kg / 2.12 LBS
~0 Gs
60 mm 0.54 kg / 1.19 LBS
592 Gs
0.08 kg / 0.18 LBS
81 g / 0.8 N
 0.49 kg / 1.07 LBS
~0 Gs
70 mm 0.29 kg / 0.64 LBS
433 Gs
0.04 kg / 0.10 LBS
43 g / 0.4 N
 0.26 kg / 0.57 LBS
~0 Gs
80 mm 0.16 kg / 0.36 LBS
324 Gs
0.02 kg / 0.05 LBS
24 g / 0.2 N
 0.15 kg / 0.32 LBS
~0 Gs
90 mm 0.10 kg / 0.21 LBS
248 Gs
0.01 kg / 0.03 LBS
14 g / 0.1 N
 0.09 kg / 0.19 LBS
~0 Gs
100 mm 0.06 kg / 0.13 LBS
194 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a neodymium and metal combination. The connection of two magnets produces a massive flux and a further horizon of performance. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the impact force is huge. The repulsion force is marginally weaker than the attraction, but still significant.
*Flux density between like poles reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
* Calculations demonstrate shear force of a pair of matching magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
MPL 50x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.0 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Car key 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field is a large risk to IT equipment and pacemakers. These NdFeB products produce a flux that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation passes through tissues and housings. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Influence will be felt by: mechanical watches, car keys, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MPL 50x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.29 km/h
(6.19 m/s)
 1.44 J
30 mm 35.10 km/h
(9.75 m/s)
 3.56 J
50 mm 45.12 km/h
(12.53 m/s)
 5.89 J
100 mm 63.77 km/h
(17.72 m/s)
 11.77 J
NdFeB products are delicate – a collision with steel risks their cracking. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 50x20x10 / 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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 50x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 32 980 Mx 329.8 µWb
Pc Coefficient 0.38 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 50x20x10 / N38

Environment Effective steel pull Effect
Air (land) 29.99 kg Standard
Water (riverbed) 34.34 kg
(+4.35 kg buoyancy gain)
+14.5%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Vertical hold

*Note: On a vertical surface, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

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
Chemical composition
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%
Sustainability
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: 020165-2026
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x10 mm and a weight of 75 g, guarantees the highest quality connection. As a block magnet with high power (approx. 29.99 kg), this product is available immediately 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 50x20x10 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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 50x20x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 20 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 50x20x10 mm and a self-weight of 75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They do not lose their magnetic properties even under strong external field,
  • Thanks to the metallic finish, the coating of nickel, gold, or silver gives an aesthetic appearance,
  • Neodymium magnets create maximum magnetic induction on a contact point, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to the potential of precise forming and adaptation to individualized solutions, magnetic components can be manufactured in a broad palette of forms and dimensions, which amplifies use scope,
  • Fundamental importance in modern industrial fields – they are used in hard drives, motor assemblies, medical equipment, as well as industrial machines.
  • 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 protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
  • Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these devices can complicate diagnosis medical after entering the body.
  • Due to complex production process, their price is relatively high,

Pull force analysis

Maximum holding power of the magnet – what it depends on?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:
  • with the contact of a yoke made of special test steel, guaranteeing full magnetic saturation
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with an ground contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • during pulling in a direction perpendicular to the mounting surface
  • at conditions approx. 20°C

Determinants of practical lifting force of a magnet

Holding efficiency is influenced by working environment parameters, such as (from priority):
  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
  • Plate thickness – too thin sheet does not close the flux, causing part of the power to be lost into the air.
  • Chemical composition of the base – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Beware of splinters

NdFeB magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets will cause them cracking into small pieces.

Fire warning

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Conscious usage

Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

GPS and phone interference

An intense magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Maintain magnets close to a smartphone to prevent breaking the sensors.

Demagnetization risk

Keep cool. Neodymium magnets are sensitive to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Serious injuries

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Be careful!

Danger to pacemakers

Individuals with a pacemaker should maintain an large gap from magnets. The magnetism can stop the operation of the life-saving device.

Danger to the youngest

Neodymium magnets are not suitable for play. Swallowing several magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and necessitates immediate surgery.

Skin irritation risks

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and opt for versions in plastic housing.

Electronic hazard

Equipment safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, timepieces).

Danger! More info about hazards in the article: Safety of working with magnets.