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MPL 50x20x20 / 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 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 ZŁ with VAT / pcs + price for transport

38.47 ZŁ net + 23% VAT / pcs

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Parameters as well as form of a neodymium magnet can be analyzed on our magnetic mass calculator.

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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

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 modeling of the magnet - technical parameters

Presented values represent the result of a physical simulation. Values rely on algorithms for the material Nd₂Fe₁₄B. Real-world performance may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MPL 50x20x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4789 Gs 478.9 mT	42.18 kg / 42180.0 g 413.8 N	dangerous!
1 mm	4452 Gs 445.2 mT	36.46 kg / 36461.5 g 357.7 N	dangerous!
2 mm	4114 Gs 411.4 mT	31.13 kg / 31126.5 g 305.4 N	dangerous!
3 mm	3784 Gs 378.4 mT	26.34 kg / 26336.3 g 258.4 N	dangerous!
5 mm	3173 Gs 317.3 mT	18.52 kg / 18523.4 g 181.7 N	dangerous!
10 mm	2022 Gs 202.2 mT	7.52 kg / 7522.9 g 73.8 N	strong
15 mm	1324 Gs 132.4 mT	3.22 kg / 3222.6 g 31.6 N	strong
20 mm	899 Gs 89.9 mT	1.49 kg / 1487.5 g 14.6 N	safe
30 mm	458 Gs 45.8 mT	0.39 kg / 385.8 g 3.8 N	safe
50 mm	159 Gs 15.9 mT	0.05 kg / 46.4 g 0.5 N	safe

Pulling power drops significantly with every subsequent millimeter of gap. Remember that even a microscopic distance (e.g., dirt, varnish, rust) strongly weakens the grip. Magnetic products hold most effectively in perfect adhesion; gap drastically cuts the force. Analyze how rapidly the load capacity fall, when the product does not touch flatly to the steel surface. When designing the assembly, avoid redundant distances.

Table 2: Shear capacity (wall)
MPL 50x20x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	8.44 kg / 8436.0 g 82.8 N
1 mm	Stal (~0.2)	7.29 kg / 7292.0 g 71.5 N
2 mm	Stal (~0.2)	6.23 kg / 6226.0 g 61.1 N
3 mm	Stal (~0.2)	5.27 kg / 5268.0 g 51.7 N
5 mm	Stal (~0.2)	3.70 kg / 3704.0 g 36.3 N
10 mm	Stal (~0.2)	1.50 kg / 1504.0 g 14.8 N
15 mm	Stal (~0.2)	0.64 kg / 644.0 g 6.3 N
20 mm	Stal (~0.2)	0.30 kg / 298.0 g 2.9 N
30 mm	Stal (~0.2)	0.08 kg / 78.0 g 0.8 N
50 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N

The following data defines the approximate holding capacity necessary to initiate the slippage of the magnet vertically on a vertical metal surface (assuming standard friction coefficient). This value depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x20x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	12.65 kg / 12654.0 g 124.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	8.44 kg / 8436.0 g 82.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	4.22 kg / 4218.0 g 41.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	21.09 kg / 21090.0 g 206.9 N

When mounting a holder on a upright surface (e.g., a car body), it you can count on barely approx. 20%-30% of its maximum pull force. Gravity as well as a weak degree of grip mean that magnets slide down faster than they pop off the substrate. Planning a vertical fastening? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will slip down under a much lighter load. Application of an anti-slip coating can significantly raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 50x20x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	2.11 kg / 2109.0 g 20.7 N
1 mm	13%	5.27 kg / 5272.5 g 51.7 N
2 mm	25%	10.55 kg / 10545.0 g 103.4 N
5 mm	63%	26.36 kg / 26362.5 g 258.6 N
10 mm	100%	42.18 kg / 42180.0 g 413.8 N

A thin metal plate is incapable of absorb the entire magnetic field, which wastes potential of the magnet. If you mount a strong magnet to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you need a suitably thick element of metal. The saturation phenomenon causes that on thin elements (e.g., thin profiles), the product works worse. We recommend selecting the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 50x20x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	42.18 kg / 42180.0 g 413.8 N	OK
40 °C	-2.2%	41.25 kg / 41252.0 g 404.7 N	OK
60 °C	-4.4%	40.32 kg / 40324.1 g 395.6 N	OK
80 °C	-6.6%	39.40 kg / 39396.1 g 386.5 N
100 °C	-28.8%	30.03 kg / 30032.2 g 294.6 N

Ordinary NdFeB products lose strength above the temperature limit. Avoid high temperatures – excessive heat can irreversibly destroy this product. With every degree above norm, the neodymium's power momentarily drops. Avoid using this magnet near heat sources higher than its working range. Ignoring the limit will result in destruction of magnetism.

*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 50x20x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	141.37 kg / 141367 g 1386.8 N 5 687 Gs	N/A
1 mm	131.73 kg / 131727 g 1292.2 N 9 245 Gs	118.55 kg / 118555 g 1163.0 N ~0 Gs
2 mm	122.20 kg / 122202 g 1198.8 N 8 904 Gs	109.98 kg / 109981 g 1078.9 N ~0 Gs
3 mm	113.05 kg / 113050 g 1109.0 N 8 564 Gs	101.74 kg / 101745 g 998.1 N ~0 Gs
5 mm	96.05 kg / 96052 g 942.3 N 7 894 Gs	86.45 kg / 86447 g 848.0 N ~0 Gs
10 mm	62.08 kg / 62082 g 609.0 N 6 347 Gs	55.87 kg / 55873 g 548.1 N ~0 Gs
20 mm	25.21 kg / 25213 g 247.3 N 4 045 Gs	22.69 kg / 22692 g 222.6 N ~0 Gs
50 mm	2.46 kg / 2464 g 24.2 N 1 264 Gs	2.22 kg / 2218 g 21.8 N ~0 Gs

Two strong neodymiums attract each other from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet produces a massive flux and a further horizon of performance. Designing a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the collision energy is huge. The repulsion force is slightly lower than the connection force, but still large.
*Flux density in repulsion mode reaches ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Safety (HSE) (implants) - 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
Mechanical watch	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

Extremely neodym field poses a serious hazard to IT equipment as well as medical implants. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field passes through tissues and glass. Increased vigilance must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MPL 50x20x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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

NdFeB products are prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can cause material chips or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Corrosion resistance
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)

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 50x20x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	46 654 Mx	466.5 µWb
P_c Coefficient	0.63	High (Stable)

Flux value emitted by the pole surface. Essential parameter when building generators and motors. P_c value determines the working geometry.

Table 11: Underwater work (magnet fishing)
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: 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. However, remember the water resistance when pulling the rope quickly.

1. Vertical hold

*Note: On a vertical surface, the magnet retains only a fraction of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient P_c (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 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 specification and ecology

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%

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: 020166-2025

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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 42.18 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 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. To separate the MPL 50x20x20 / 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 generators and material handling systems. They work great as fasteners under tiles, wood, or glass. 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 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).

The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.

This model is characterized by dimensions 50x20x20 mm, which, at a weight of 150 g, makes it an element with impressive energy density. 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 Nd₂Fe₁₄B magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:

They retain attractive force for nearly 10 years – the loss is just ~1% (in theory),
They are resistant to demagnetization induced by presence of other magnetic fields,
The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
Magnets are characterized by extremely high magnetic induction on the working surface,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
Possibility of exact forming and optimizing to individual applications,
Universal use in high-tech industry – they find application in magnetic memories, drive modules, medical equipment, and other advanced devices.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can reduce 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 rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Limited ability of producing threads in the magnet and complicated forms - preferred is cover - magnet mounting.
Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can complicate diagnosis medical in case of swallowing.
Due to expensive raw materials, their price is relatively high,

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The force parameter is a result of laboratory testing performed under specific, ideal conditions:

with the application of a yoke made of special test steel, ensuring full magnetic saturation
with a cross-section minimum 10 mm
with an ideally smooth touching surface
with zero gap (without impurities)
during pulling in a direction perpendicular to the plane
in stable room temperature

Key elements affecting lifting force

Holding efficiency impacted by working environment parameters, such as (from priority):

Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
Plate thickness – insufficiently thick steel does not accept the full field, causing part of the power to be wasted to the other side.
Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic properties and holding force.
Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal weaken the grip.
Thermal conditions – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate reduces the holding force.

Warnings

Keep away from computers

Very strong magnetic fields can destroy records on credit cards, HDDs, and storage devices. Maintain a gap of min. 10 cm.

No play value

These products are not toys. Eating several magnets may result in them connecting inside the digestive tract, which poses a critical condition and requires urgent medical intervention.

Dust explosion hazard

Combustion risk: Rare earth powder is highly flammable. Do not process magnets in home conditions as this may cause fire.

Impact on smartphones

A powerful magnetic field interferes with the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Implant safety

Warning for patients: Strong magnetic fields disrupt medical devices. Maintain at least 30 cm distance or ask another person to handle the magnets.

Permanent damage

Standard neodymium magnets (grade N) lose magnetization when the temperature exceeds 80°C. This process is irreversible.

Sensitization to coating

Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, refrain from direct skin contact or select coated magnets.

Pinching danger

Pinching hazard: The attraction force is so great that it can cause hematomas, crushing, and broken bones. Use thick gloves.

Handling guide

Be careful. Neodymium magnets act from a long distance and connect with huge force, often faster than you can move away.

Beware of splinters

Neodymium magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets leads to them cracking into shards.

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

MPL 50x20x20 / N38 - lamellar magnet

Want to negotiate?

MPL 50x20x20 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - technical parameters

1. Vertical hold

2. Efficiency vs thickness

3. Power loss vs temp

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

Elemental analysis

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

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MPL 40x20x10 / N38 - lamellar magnet

MW 15x2 / N38 - cylindrical magnet

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SMZR 25x125 / N52 - magnetic separator with handle

Pros as well as cons of Nd2Fe14B magnets.

Benefits

Disadvantages

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Key elements affecting lifting force

Keep away from computers

No play value

Dust explosion hazard

Impact on smartphones

Implant safety

Permanent damage

Sensitization to coating

Pinching danger

Handling guide

Beware of splinters

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros as well as cons of Nd₂Fe₁₄B magnets.