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MPL 50x20x10 / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

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

43.05 ZŁ with VAT / pcs + price for transport

35.00 ZŁ net + 23% VAT / pcs

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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

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 analysis of the product - report

These data constitute the result of a physical analysis. Results rely on algorithms for the class Nd₂Fe₁₄B. Actual conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap during assembly planning.

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

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3371 Gs 337.1 mT	29.99 kg / 29990.0 g 294.2 N	dangerous!
1 mm	3158 Gs 315.8 mT	26.32 kg / 26323.3 g 258.2 N	dangerous!
2 mm	2932 Gs 293.2 mT	22.69 kg / 22687.6 g 222.6 N	dangerous!
3 mm	2703 Gs 270.3 mT	19.29 kg / 19286.7 g 189.2 N	dangerous!
5 mm	2266 Gs 226.6 mT	13.55 kg / 13546.3 g 132.9 N	dangerous!
10 mm	1419 Gs 141.9 mT	5.31 kg / 5313.0 g 52.1 N	medium risk
15 mm	908 Gs 90.8 mT	2.17 kg / 2174.5 g 21.3 N	medium risk
20 mm	603 Gs 60.3 mT	0.96 kg / 961.0 g 9.4 N	weak grip
30 mm	296 Gs 29.6 mT	0.23 kg / 231.0 g 2.3 N	weak grip
50 mm	97 Gs 9.7 mT	0.02 kg / 24.8 g 0.2 N	weak grip

Pulling power decreases significantly with every mm of distance. Remember that even a microscopic distance (e.g., contamination, paint, veneer) noticeably diminishes the holding power. Neodymiums work optimally during direct contact; gap nullifies the power. Analyze how quickly the load capacity fall, when the product does not adhere flatly to the metal substrate. When designing the assembly, eliminate unnecessary gaps.

Table 2: Vertical capacity (vertical surface)
MPL 50x20x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	6.00 kg / 5998.0 g 58.8 N
1 mm	Stal (~0.2)	5.26 kg / 5264.0 g 51.6 N
2 mm	Stal (~0.2)	4.54 kg / 4538.0 g 44.5 N
3 mm	Stal (~0.2)	3.86 kg / 3858.0 g 37.8 N
5 mm	Stal (~0.2)	2.71 kg / 2710.0 g 26.6 N
10 mm	Stal (~0.2)	1.06 kg / 1062.0 g 10.4 N
15 mm	Stal (~0.2)	0.43 kg / 434.0 g 4.3 N
20 mm	Stal (~0.2)	0.19 kg / 192.0 g 1.9 N
30 mm	Stal (~0.2)	0.05 kg / 46.0 g 0.5 N
50 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N

The table below defines the theoretical holding capacity necessary to start the shifting of the magnet vertically on a vertical steel wall (assuming standard friction). The holding force depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 50x20x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	9.00 kg / 8997.0 g 88.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	6.00 kg / 5998.0 g 58.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	3.00 kg / 2999.0 g 29.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	15.00 kg / 14995.0 g 147.1 N

When hanging a element on a vertical wall (e.g., a car body), it will maintain only approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip mean that products slide down faster than they pull off. Designing a wall mount? Note that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slip down under a noticeably lighter weight. Using a rubber coating can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x20x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	1.50 kg / 1499.5 g 14.7 N
1 mm	13%	3.75 kg / 3748.8 g 36.8 N
2 mm	25%	7.50 kg / 7497.5 g 73.6 N
5 mm	63%	18.74 kg / 18743.8 g 183.9 N
10 mm	100%	29.99 kg / 29990.0 g 294.2 N

A thin metal plate is unable to take in the full magnetic flux, which weakens actual performance of the magnet. Should you install a neodymium to a thin surface, the flux will pass right through and the pull force will drop sharply. To utilize 100% of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation causes that on sheet metal structures (e.g., thin profiles), the product works worse. We recommend selecting the steel dimension based on the following data.

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

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	29.99 kg / 29990.0 g 294.2 N	OK
40 °C	-2.2%	29.33 kg / 29330.2 g 287.7 N	OK
60 °C	-4.4%	28.67 kg / 28670.4 g 281.3 N
80 °C	-6.6%	28.01 kg / 28010.7 g 274.8 N
100 °C	-28.8%	21.35 kg / 21352.9 g 209.5 N

Classic neodymiums change their properties strength past the thermal threshold. Watch out for overheating – heat can permanently destroy this product. With every degree above norm, the neodymium's power momentarily lowers. Do not use this product in hot environments higher than its working range. Exceeding the critical threshold will lead to irreversible degradation of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (low permeance coefficient) may lose charge permanently sooner than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

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

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	70.06 kg / 70058 g 687.3 N 4 789 Gs	N/A
1 mm	65.83 kg / 65828 g 645.8 N 6 535 Gs	59.25 kg / 59245 g 581.2 N ~0 Gs
2 mm	61.49 kg / 61492 g 603.2 N 6 316 Gs	55.34 kg / 55343 g 542.9 N ~0 Gs
3 mm	57.20 kg / 57198 g 561.1 N 6 092 Gs	51.48 kg / 51478 g 505.0 N ~0 Gs
5 mm	48.94 kg / 48940 g 480.1 N 5 635 Gs	44.05 kg / 44046 g 432.1 N ~0 Gs
10 mm	31.64 kg / 31645 g 310.4 N 4 531 Gs	28.48 kg / 28480 g 279.4 N ~0 Gs
20 mm	12.41 kg / 12412 g 121.8 N 2 838 Gs	11.17 kg / 11170 g 109.6 N ~0 Gs
50 mm	1.07 kg / 1066 g 10.5 N 832 Gs	0.96 kg / 960 g 9.4 N ~0 Gs

Two magnets interact from a significantly greater distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when attracting two neodymiums, the impact force is extreme. The levitation is marginally weaker than the attraction, but still impressive.
*Field value in repulsion mode is approximately ~0 Gs at the midpoint between the magnets (resulting from vector opposition).

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
Remote	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

A strong magnetic field poses a large risk to IT equipment as well as medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

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

Start from (mm)	Speed (km/h)	Energy (J)
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 collision with steel can result in shattering. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Kinetic force can cause material chips or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with powerful specimens.

Table 9: Coating parameters (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. Note the thickness of the protective layer.

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

Parameter	Value	SI Unit / Description
Magnetic Flux	32 980 Mx	329.8 µWb
P_c Coefficient	0.38	Low (Flat)

Total magnetic flux passing through the pole surface. Essential parameter for generator designers as well as sensors. P_c value defines the magnet's operating point.

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%

Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Heat tolerance

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

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

chart generated for the permeance coefficient P_c (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 P_c (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 P_c 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%

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: 020165-2025

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x20x10 mm and a weight of 75 g, guarantees the highest quality connection. This magnetic block with a force of 294.15 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

The key to success is sliding 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. Watch your fingers! Magnets with a force of 29.99 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 50x20x10 / 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 50x20x10 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

This model is characterized by dimensions 50x20x10 mm, which, at a weight of 75 g, makes it an element with high energy density. 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 product meets the standards for N38 grade magnets.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:

They retain attractive force for almost 10 years – the drop is just ~1% (based on simulations),
They feature excellent resistance to magnetism drop due to external magnetic sources,
By applying a decorative layer of gold, the element has an professional look,
Magnets have huge magnetic induction on the outer side,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to flexibility in forming and the ability to adapt to unusual requirements,
Huge importance in innovative solutions – they are commonly used in mass storage devices, electric drive systems, advanced medical instruments, also complex engineering applications.
Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals

To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
Limited ability of producing threads in the magnet and complex shapes - preferred is a housing - magnetic holder.
Health risk related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical in case of swallowing.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding force – what affects it?

Breakaway force was determined for ideal contact conditions, assuming:

using a sheet made of low-carbon steel, serving as a ideal flux conductor
possessing a massiveness of minimum 10 mm to ensure full flux closure
with a plane cleaned and smooth
without any air gap between the magnet and steel
during detachment in a direction vertical to the mounting surface
at ambient temperature room level

Practical aspects of lifting capacity – factors

Effective lifting capacity impacted by specific conditions, mainly (from most important):

Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
Steel grade – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
Base smoothness – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet and the plate decreases the lifting capacity.

Precautions when working with NdFeB magnets

Thermal limits

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

Crushing force

Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Life threat

Patients with a heart stimulator should maintain an safe separation from magnets. The magnetism can stop the operation of the implant.

Immense force

Handle magnets with awareness. Their immense force can surprise even professionals. Plan your moves and do not underestimate their power.

Phone sensors

A powerful magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Maintain magnets close to a device to prevent damaging the sensors.

Dust explosion hazard

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.

Protect data

Do not bring magnets close to a wallet, computer, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Nickel coating and allergies

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. For allergy sufferers, refrain from direct skin contact and opt for coated magnets.

This is not a toy

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

Beware of splinters

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

Warning! Learn more about risks in the article: Safety of working with magnets.

MPL 50x20x10 / N38 - lamellar magnet

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MPL 50x20x10 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical analysis of the product - report

1. Wall mount (shear)

2. Plate thickness effect

3. Heat tolerance

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

Elemental analysis

Sustainability

Pulling force

Field Strength

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Advantages and disadvantages of Nd2Fe14B magnets.

Pros

Limitations

Holding force characteristics

Highest magnetic holding force – what affects it?

Practical aspects of lifting capacity – factors

Thermal limits

Crushing force

Life threat

Immense force

Phone sensors

Dust explosion hazard

Protect data

Nickel coating and allergies

This is not a toy

Beware of splinters

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages and disadvantages of Nd₂Fe₁₄B magnets.