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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

see technical specifications »

43.05 ZŁ with VAT / pcs + price for transport

35.00 ZŁ net + 23% VAT / pcs

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Parameters and structure of a neodymium magnet can be analyzed on our magnetic mass calculator.

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Technical details - 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 simulation of the assembly - report

The following information constitute the direct effect of a physical analysis. Results rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Please consider these data as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - characteristics
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 pounds
29990.0 g / 294.2 N
 crushing
1 mm 3158 Gs
315.8 mT
 26.32 kg / 58.03 pounds
26323.3 g / 258.2 N
 crushing
2 mm 2932 Gs
293.2 mT
 22.69 kg / 50.02 pounds
22687.6 g / 222.6 N
 crushing
3 mm 2703 Gs
270.3 mT
 19.29 kg / 42.52 pounds
19286.7 g / 189.2 N
 crushing
5 mm 2266 Gs
226.6 mT
 13.55 kg / 29.86 pounds
13546.3 g / 132.9 N
 crushing
10 mm 1419 Gs
141.9 mT
 5.31 kg / 11.71 pounds
5313.0 g / 52.1 N
 medium risk
15 mm 908 Gs
90.8 mT
 2.17 kg / 4.79 pounds
2174.5 g / 21.3 N
 medium risk
20 mm 603 Gs
60.3 mT
 0.96 kg / 2.12 pounds
961.0 g / 9.4 N
 weak grip
30 mm 296 Gs
29.6 mT
 0.23 kg / 0.51 pounds
231.0 g / 2.3 N
 weak grip
50 mm 97 Gs
9.7 mT
 0.02 kg / 0.05 pounds
24.8 g / 0.2 N
 weak grip
Pulling power weakens significantly with every mm of spacing. Remember that even a very thin break (e.g., contamination, paint, dust) noticeably reduces the pull force. Magnetic products operate most effectively at the point of direct contact; air break kills the force. Observe how rapidly the pull force drop, when the product does not touch tightly to the steel surface. When designing the assembly, eliminate unnecessary gaps.

Table 2: Vertical load (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 pounds
5998.0 g / 58.8 N
1 mm Stal (~0.2) 5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
2 mm Stal (~0.2) 4.54 kg / 10.00 pounds
4538.0 g / 44.5 N
3 mm Stal (~0.2) 3.86 kg / 8.51 pounds
3858.0 g / 37.8 N
5 mm Stal (~0.2) 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
10 mm Stal (~0.2) 1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
15 mm Stal (~0.2) 0.43 kg / 0.96 pounds
434.0 g / 4.3 N
20 mm Stal (~0.2) 0.19 kg / 0.42 pounds
192.0 g / 1.9 N
30 mm Stal (~0.2) 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
The table below indicates the approximate weight limit needed to start the shifting of the magnet down along a upright steel plate (assuming typical friction). The holding force depends on the air gap between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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 pounds
8997.0 g / 88.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.00 kg / 6.61 pounds
2999.0 g / 29.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
15.00 kg / 33.06 pounds
14995.0 g / 147.1 N
When mounting a holder on a vertical surface (e.g., a car body), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravitational force and a weak degree of grip cause that holders slip easier than they detach. Planning a vertical fastening? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a noticeably lighter load. Using a rubber pad can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - 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 pounds
1499.5 g / 14.7 N
1 mm
13%
 3.75 kg / 8.26 pounds
3748.8 g / 36.8 N
2 mm
25%
 7.50 kg / 16.53 pounds
7497.5 g / 73.6 N
3 mm
38%
 11.25 kg / 24.79 pounds
11246.3 g / 110.3 N
5 mm
63%
 18.74 kg / 41.32 pounds
18743.8 g / 183.9 N
10 mm
100%
 29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
11 mm
100%
 29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
12 mm
100%
 29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
A too thin steel is not enough to focus the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a weak sheet, the flux will penetrate right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect causes that on delicate walls (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel cross-section from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MPL 50x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
 OK
40 °C -2.2% 29.33 kg / 64.66 pounds
29330.2 g / 287.7 N
 OK
60 °C -4.4% 28.67 kg / 63.21 pounds
28670.4 g / 281.3 N
80 °C -6.6% 28.01 kg / 61.75 pounds
28010.7 g / 274.8 N
100 °C -28.8% 21.35 kg / 47.07 pounds
21352.9 g / 209.5 N
Classic neodymiums irreversibly lose power above the temperature limit. Protect against heat – heat can permanently damage this magnet. With increasing heat, the neodymium's capacity temporarily drops. Refrain from using this magnet close to heaters higher than its working range. Too high temperature will cause destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, as well as the dimension ratios. Low-profile 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 (repulsion) - field collision
MPL 50x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 70.06 kg / 154.45 pounds
4 789 Gs
10.51 kg / 23.17 pounds
10509 g / 103.1 N
 N/A
1 mm 65.83 kg / 145.13 pounds
6 535 Gs
9.87 kg / 21.77 pounds
9874 g / 96.9 N
 59.25 kg / 130.61 pounds
~0 Gs
2 mm 61.49 kg / 135.57 pounds
6 316 Gs
9.22 kg / 20.34 pounds
9224 g / 90.5 N
 55.34 kg / 122.01 pounds
~0 Gs
3 mm 57.20 kg / 126.10 pounds
6 092 Gs
8.58 kg / 18.92 pounds
8580 g / 84.2 N
 51.48 kg / 113.49 pounds
~0 Gs
5 mm 48.94 kg / 107.89 pounds
5 635 Gs
7.34 kg / 16.18 pounds
7341 g / 72.0 N
 44.05 kg / 97.10 pounds
~0 Gs
10 mm 31.64 kg / 69.76 pounds
4 531 Gs
4.75 kg / 10.46 pounds
4747 g / 46.6 N
 28.48 kg / 62.79 pounds
~0 Gs
20 mm 12.41 kg / 27.36 pounds
2 838 Gs
1.86 kg / 4.10 pounds
1862 g / 18.3 N
 11.17 kg / 24.63 pounds
~0 Gs
50 mm 1.07 kg / 2.35 pounds
832 Gs
0.16 kg / 0.35 pounds
160 g / 1.6 N
 0.96 kg / 2.12 pounds
~0 Gs
60 mm 0.54 kg / 1.19 pounds
592 Gs
0.08 kg / 0.18 pounds
81 g / 0.8 N
 0.49 kg / 1.07 pounds
~0 Gs
70 mm 0.29 kg / 0.64 pounds
433 Gs
0.04 kg / 0.10 pounds
43 g / 0.4 N
 0.26 kg / 0.57 pounds
~0 Gs
80 mm 0.16 kg / 0.36 pounds
324 Gs
0.02 kg / 0.05 pounds
24 g / 0.2 N
 0.15 kg / 0.32 pounds
~0 Gs
90 mm 0.10 kg / 0.21 pounds
248 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
 0.09 kg / 0.19 pounds
~0 Gs
100 mm 0.06 kg / 0.13 pounds
194 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.11 pounds
~0 Gs
Two strong neodymiums attract each other from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet produces a massive flux and a larger range of performance. Designing a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the impact force is massive. The repulsion force is marginally weaker than the connection force, but still large.
*Flux density in repulsion mode drops to ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Figures demonstrate sliding force of two identical neodymium magnets (friction ~0.15 for Ni-Ni plating).

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
Mechanical watch 20 Gs (2.0 mT) 9.5 cm
Phone / Smartphone 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 poses a serious hazard to electronics as well as pacemakers. These magnets produce a field that destroys function of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, remotes, membranes, and displays. Do not bring the product near payment cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - 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
Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can cause material chips or injury to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 32 980 Mx 329.8 µWb
Pc Coefficient 0.38 Low (Flat)
Flux value passing through the pole surface. Key data when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains just approx. 20-30% of its nominal pull.

2. Steel thickness impact

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

*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) = 0.38

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 specification and ecology
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%
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: 020165-2026
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MPL 50x20x10 / N38 - lamellar magnet
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MPL 50x20x10 / N38 - lamellar magnet

43.05 ZŁ brutto / pcs
This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 50x20x10 mm and a weight of 75 g, guarantees premium class connection. As a block magnet with high power (approx. 29.99 kg), this product is available immediately from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. They work great as fasteners 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.
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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x20x10 / N38 model is magnetized axially (dimension 10 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 10 mm (thickness). The key parameter here is the holding force amounting to approximately 29.99 kg (force ~294.15 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of rare earth magnets.

Advantages

Apart from their superior power, neodymium magnets have these key benefits:
  • Their magnetic field is maintained, and after around ten years it drops only by ~1% (theoretically),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • By applying a shiny coating of gold, the element has an nice look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Possibility of precise creating and optimizing to individual applications,
  • Key role in innovative solutions – they find application in data components, electric drive systems, precision medical tools, as well as multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in small systems

Cons

Drawbacks and weaknesses of neodymium magnets and ways of using them
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • We recommend casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnet – what it depends on?

The declared magnet strength refers to the maximum value, recorded under laboratory conditions, namely:
  • using a base made of high-permeability steel, acting as a magnetic yoke
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

Key elements affecting lifting force

During everyday use, the actual holding force depends on a number of factors, presented from most significant:
  • Clearance – existence of any layer (rust, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Plate material – low-carbon steel gives the best results. Higher carbon content reduce magnetic properties and holding force.
  • Smoothness – full contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Magnet fragility

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching shards into the air. We recommend safety glasses.

Threat to navigation

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Medical interference

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

Bodily injuries

Risk of injury: The pulling power is so immense that it can cause blood blisters, pinching, and broken bones. Protective gloves are recommended.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction appears, cease working with magnets and wear gloves.

Electronic hazard

Device Safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Fire risk

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

Conscious usage

Use magnets with awareness. Their immense force can shock even experienced users. Be vigilant and do not underestimate their force.

Swallowing risk

Strictly store magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.

Power loss in heat

Avoid heat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Important! Looking for details? Read our article: Why are neodymium magnets dangerous?