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MPL 50x20x5 / 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 020473

GTIN/EAN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

Coating

[NiCuNi] Nickel

14.56 ZŁ with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics MPL 50x20x5 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020473
GTIN/EAN	5906301811930
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	5 mm [±0,1 mm]
Weight	37.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	12.69 kg / 124.48 N
Magnetic Induction ~ ?	197.73 mT / 1977 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 simulation of the assembly - report

Presented data constitute the direct effect of a physical calculation. Values rely on models for the class Nd₂Fe₁₄B. Actual performance might slightly differ from theoretical values. Use these calculations as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - interaction chart
MPL 50x20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1977 Gs 197.7 mT	12.69 kg / 12690.0 g 124.5 N	dangerous!
1 mm	1885 Gs 188.5 mT	11.53 kg / 11530.3 g 113.1 N	dangerous!
2 mm	1772 Gs 177.2 mT	10.20 kg / 10199.9 g 100.1 N	dangerous!
3 mm	1649 Gs 164.9 mT	8.83 kg / 8831.3 g 86.6 N	warning
5 mm	1395 Gs 139.5 mT	6.32 kg / 6320.3 g 62.0 N	warning
10 mm	870 Gs 87.0 mT	2.46 kg / 2459.4 g 24.1 N	warning
15 mm	549 Gs 54.9 mT	0.98 kg / 976.9 g 9.6 N	safe
20 mm	359 Gs 35.9 mT	0.42 kg / 418.9 g 4.1 N	safe
30 mm	172 Gs 17.2 mT	0.10 kg / 95.7 g 0.9 N	safe
50 mm	54 Gs 5.4 mT	0.01 kg / 9.5 g 0.1 N	safe

Grip strength weakens significantly with every subsequent millimeter of spacing. Keep in mind that even a very thin break (e.g., contamination, varnish, dust) significantly reduces the pull force. Magnetic products hold optimally in perfect adhesion; distance kills the power. See how rapidly the load capacity drop, when the magnet does not touch flatly to the metal substrate. When planning the arrangement, avoid unnecessary gaps.

Table 2: Shear load (wall)
MPL 50x20x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	2.54 kg / 2538.0 g 24.9 N
1 mm	Stal (~0.2)	2.31 kg / 2306.0 g 22.6 N
2 mm	Stal (~0.2)	2.04 kg / 2040.0 g 20.0 N
3 mm	Stal (~0.2)	1.77 kg / 1766.0 g 17.3 N
5 mm	Stal (~0.2)	1.26 kg / 1264.0 g 12.4 N
10 mm	Stal (~0.2)	0.49 kg / 492.0 g 4.8 N
15 mm	Stal (~0.2)	0.20 kg / 196.0 g 1.9 N
20 mm	Stal (~0.2)	0.08 kg / 84.0 g 0.8 N
30 mm	Stal (~0.2)	0.02 kg / 20.0 g 0.2 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

The following data shows the approximate shear load required to initiate the downward movement of the magnet vertically on a vertical steel plate (assuming typical friction). The holding force depends on the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
MPL 50x20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	3.81 kg / 3807.0 g 37.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.54 kg / 2538.0 g 24.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.27 kg / 1269.0 g 12.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	6.35 kg / 6345.0 g 62.2 N

When hanging a element on a vertical surface (e.g., a board), it you can count on barely approx. 1/5 of nominal attraction strength. Gravity and a weak degree of grip mean that magnets slip easier than they pull off. Want to create a wall mount? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the magnet will give way down under a much lighter load. Utilizing a rubberized pad can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.63 kg / 634.5 g 6.2 N
1 mm	13%	1.59 kg / 1586.3 g 15.6 N
2 mm	25%	3.17 kg / 3172.5 g 31.1 N
5 mm	63%	7.93 kg / 7931.2 g 77.8 N
10 mm	100%	12.69 kg / 12690.0 g 124.5 N

A thin metal plate cannot focus the entire magnetic field, which wastes potential of the magnet. If you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you require a sufficiently solid element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., car bodies), the product holds weaker. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 50x20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	12.69 kg / 12690.0 g 124.5 N	OK
40 °C	-2.2%	12.41 kg / 12410.8 g 121.8 N	OK
60 °C	-4.4%	12.13 kg / 12131.6 g 119.0 N
80 °C	-6.6%	11.85 kg / 11852.5 g 116.3 N
100 °C	-28.8%	9.04 kg / 9035.3 g 88.6 N

Classic neodymiums irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can irreversibly destroy this magnet. With increasing heat, the magnet's capacity temporarily decreases. Refrain from using this magnet in hot environments exceeding its working range. Ignoring the limit will lead to permanent loss of magnetism.

*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties sooner than long magnets. The danger warning in the table signals permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 50x20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	24.10 kg / 24097 g 236.4 N 3 371 Gs	N/A
1 mm	23.06 kg / 23059 g 226.2 N 3 868 Gs	20.75 kg / 20753 g 203.6 N ~0 Gs
2 mm	21.89 kg / 21894 g 214.8 N 3 769 Gs	19.71 kg / 19705 g 193.3 N ~0 Gs
3 mm	20.65 kg / 20654 g 202.6 N 3 661 Gs	18.59 kg / 18589 g 182.4 N ~0 Gs
5 mm	18.07 kg / 18065 g 177.2 N 3 424 Gs	16.26 kg / 16259 g 159.5 N ~0 Gs
10 mm	12.00 kg / 12002 g 117.7 N 2 790 Gs	10.80 kg / 10801 g 106.0 N ~0 Gs
20 mm	4.67 kg / 4670 g 45.8 N 1 741 Gs	4.20 kg / 4203 g 41.2 N ~0 Gs
50 mm	0.37 kg / 368 g 3.6 N 488 Gs	0.33 kg / 331 g 3.2 N ~0 Gs

Two strong neodymiums interact from a wider radius than a magnet and steel combination. The setup of two magnets produces a massive flux and a larger range of performance. Designing a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Be careful that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the connection force, but still large.
*The magnetic induction between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).

Table 7: Hazards (implants) - precautionary measures
MPL 50x20x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	12.5 cm
Hearing aid	10 Gs (1.0 mT)	9.5 cm
Mechanical watch	20 Gs (2.0 mT)	7.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.0 cm
Remote	50 Gs (5.0 mT)	5.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation poses a real danger to IT equipment as well as medical implants. These magnets generate a flux that destroys function of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
MPL 50x20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	20.68 km/h (5.74 m/s)	0.62 J
30 mm	32.28 km/h (8.97 m/s)	1.51 J
50 mm	41.50 km/h (11.53 m/s)	2.49 J
100 mm	58.67 km/h (16.30 m/s)	4.98 J

Magnetic elements are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to skin. Be sure to control the product during mounting so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 50x20x5 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (P_c)
MPL 50x20x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	20 792 Mx	207.9 µWb
P_c Coefficient	0.21	Low (Flat)

Flux value passing through the magnet pole. Key data for generator designers as well as sensors. P_c value determines the magnet's operating point.

Table 11: Submerged application
MPL 50x20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	12.69 kg	Standard
Water (riverbed)	14.53 kg (+1.84 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. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its max power.

2. Steel thickness impact

*Thin metal sheet (e.g. 0.5mm PC 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 P_c (Permeance Coefficient) = 0.21

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 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%

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: 020473-2025

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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

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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 50x20x5 mm and a weight of 37.5 g, guarantees the highest quality connection. This rectangular block with a force of 124.48 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.

Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x20x5 / 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. Thanks to the flat surface and high force (approx. 12.69 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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).

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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of Nd₂Fe₁₄B magnets.

Pros

Besides their immense pulling force, neodymium magnets offer the following advantages:

They do not lose magnetism, even during around ten years – the decrease in lifting capacity is only ~1% (based on measurements),
Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external magnetic fields,
A magnet with a smooth silver surface has an effective appearance,
They feature high magnetic induction at the operating surface, which affects their effectiveness,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
Thanks to the possibility of free shaping and adaptation to unique projects, neodymium magnets can be manufactured in a wide range of forms and dimensions, which increases their versatility,
Fundamental importance in future technologies – they serve a role in computer drives, electric drive systems, diagnostic systems, as well as technologically advanced constructions.
Thanks to their power density, small magnets offer high operating force, occupying minimum space,

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 raises their durability
Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can be problematic in diagnostics medical in case of swallowing.
High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

The load parameter shown represents the maximum value, recorded under ideal test conditions, meaning:

using a plate made of mild steel, acting as a magnetic yoke
possessing a thickness of at least 10 mm to avoid saturation
characterized by lack of roughness
with zero gap (without coatings)
during pulling in a direction vertical to the mounting surface
at room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the magnet holding may be lower influenced by elements below, starting with the most relevant:

Distance – the presence of any layer (paint, dirt, gap) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
Chemical composition of the base – low-carbon steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
Thermal environment – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.

H&S for magnets

Dust is flammable

Machining of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. We recommend safety glasses.

Keep away from electronics

A powerful magnetic field negatively affects the operation of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid breaking the sensors.

Physical harm

Big blocks can crush fingers in a fraction of a second. Never place your hand betwixt two attracting surfaces.

Electronic devices

Data protection: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Medical implants

Individuals with a pacemaker must maintain an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Heat warning

Do not overheat. Neodymium magnets are sensitive to temperature. If you require operation above 80°C, look for HT versions (H, SH, UH).

Conscious usage

Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Think ahead.

Warning for allergy sufferers

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, immediately stop handling magnets and use protective gear.

Choking Hazard

Product intended for adults. Tiny parts can be swallowed, causing severe trauma. Store out of reach of children and animals.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?

MPL 50x20x5 / N38 - lamellar magnet

Need advice?

MPL 50x20x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the assembly - report

1. Wall mount (shear)

2. Steel thickness impact

3. Power loss vs temp

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

Elemental analysis

Sustainability

Pulling force

Magnetic Field

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MPL 40x10x5x2[7/3.5] / N38 - lamellar magnet

Pros and cons of Nd2Fe14B magnets.

Pros

Disadvantages

Lifting parameters

Best holding force of the magnet in ideal parameters – what it depends on?

Lifting capacity in practice – influencing factors

Dust is flammable

Risk of cracking

Keep away from electronics

Physical harm

Electronic devices

Medical implants

Heat warning

Conscious usage

Warning for allergy sufferers

Choking Hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.