MPL 12x10x4 / N38 - lamellar magnet - ujęcie 2

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MPL 12x10x4 / 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 020118

GTIN/EAN: 5906301811244

5.00

length

12 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

3.6 g

Magnetization Direction

↑ axial

Load capacity

3.45 kg / 33.88 N

Magnetic Induction

340.59 mT / 3406 Gs

Coating

[NiCuNi] Nickel

1.697 ZŁ with VAT / pcs + price for transport

1.380 ZŁ net + 23% VAT / pcs

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MPL 12x10x4 / N38 - lamellar magnet

Specification / characteristics MPL 12x10x4 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020118
GTIN/EAN	5906301811244
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	12 mm [±0,1 mm]
Width	10 mm [±0,1 mm]
Height	4 mm [±0,1 mm]
Weight	3.6 g
Magnetization Direction	↑ axial
Load capacity ~ ?	3.45 kg / 33.88 N
Magnetic Induction ~ ?	340.59 mT / 3406 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 12x10x4 / 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 product - report

These values are the outcome of a physical calculation. Results are based on algorithms for the class Nd₂Fe₁₄B. Real-world performance may differ. Treat these data as a supplementary guide when designing systems.

Table 1: Static force (force vs distance) - interaction chart
MPL 12x10x4 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3404 Gs 340.4 mT	3.45 kg / 3450.0 g 33.8 N	warning
1 mm	2920 Gs 292.0 mT	2.54 kg / 2538.8 g 24.9 N	warning
2 mm	2399 Gs 239.9 mT	1.71 kg / 1713.7 g 16.8 N	weak grip
3 mm	1919 Gs 191.9 mT	1.10 kg / 1096.3 g 10.8 N	weak grip
5 mm	1190 Gs 119.0 mT	0.42 kg / 421.6 g 4.1 N	weak grip
10 mm	392 Gs 39.2 mT	0.05 kg / 45.7 g 0.4 N	weak grip
15 mm	162 Gs 16.2 mT	0.01 kg / 7.8 g 0.1 N	weak grip
20 mm	80 Gs 8.0 mT	0.00 kg / 1.9 g 0.0 N	weak grip
30 mm	27 Gs 2.7 mT	0.00 kg / 0.2 g 0.0 N	weak grip
50 mm	7 Gs 0.7 mT	0.00 kg / 0.0 g 0.0 N	weak grip

Grip strength weakens sharply with every mm of gap. Remember that every additional insulation layer (e.g., contamination, varnish, veneer) strongly reduces the pull force. Magnets work optimally during direct contact; air break kills the force. Notice how quickly the parameters fall, when the magnet does not touch tightly to the steel surface. When designing the mounting, avoid redundant distances.

Table 2: Sliding force (vertical surface)
MPL 12x10x4 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.69 kg / 690.0 g 6.8 N
1 mm	Stal (~0.2)	0.51 kg / 508.0 g 5.0 N
2 mm	Stal (~0.2)	0.34 kg / 342.0 g 3.4 N
3 mm	Stal (~0.2)	0.22 kg / 220.0 g 2.2 N
5 mm	Stal (~0.2)	0.08 kg / 84.0 g 0.8 N
10 mm	Stal (~0.2)	0.01 kg / 10.0 g 0.1 N
15 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section defines the theoretical weight limit needed to initiate the shifting of the magnet vertically on a vertical steel wall (assuming typical friction coefficient). This value is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - vertical pull
MPL 12x10x4 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	1.04 kg / 1035.0 g 10.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.69 kg / 690.0 g 6.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.35 kg / 345.0 g 3.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	1.73 kg / 1725.0 g 16.9 N

When placing a magnet on a vertical wall (e.g., a car body), it you can count on just approx. 20%-30% of nominal attraction strength. Gravity and a low friction coefficient cause that holders slide down easier than they detach. Planning a hanger? Consider that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slide down under a significantly smaller weight. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 12x10x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.35 kg / 345.0 g 3.4 N
1 mm	25%	0.86 kg / 862.5 g 8.5 N
2 mm	50%	1.73 kg / 1725.0 g 16.9 N
5 mm	100%	3.45 kg / 3450.0 g 33.8 N
10 mm	100%	3.45 kg / 3450.0 g 33.8 N

A too thin steel is incapable of focus the entire magnetic field, which wastes potential of the holder. If you mount a strong magnet to a thin surface, the flux will pass right through and the pull force will drop sharply. To squeeze 100% of this neodymium's power, you require a sufficiently solid element of metal. The saturation phenomenon causes that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 12x10x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	3.45 kg / 3450.0 g 33.8 N	OK
40 °C	-2.2%	3.37 kg / 3374.1 g 33.1 N	OK
60 °C	-4.4%	3.30 kg / 3298.2 g 32.4 N
80 °C	-6.6%	3.22 kg / 3222.3 g 31.6 N
100 °C	-28.8%	2.46 kg / 2456.4 g 24.1 N

Standard neodymium magnets irreversibly lose strength above the temperature limit. Watch out for overheating – heat can permanently demagnetize this product. With every degree above norm, the neodymium's capacity temporarily drops. Refrain from using this magnet close to ovens higher than its operating temperature limit. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.

*Engineering note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 12x10x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	8.57 kg / 8573 g 84.1 N 4 915 Gs	N/A
1 mm	7.46 kg / 7455 g 73.1 N 6 349 Gs	6.71 kg / 6710 g 65.8 N ~0 Gs
2 mm	6.31 kg / 6309 g 61.9 N 5 841 Gs	5.68 kg / 5678 g 55.7 N ~0 Gs
3 mm	5.23 kg / 5228 g 51.3 N 5 317 Gs	4.71 kg / 4705 g 46.2 N ~0 Gs
5 mm	3.42 kg / 3423 g 33.6 N 4 302 Gs	3.08 kg / 3081 g 30.2 N ~0 Gs
10 mm	1.05 kg / 1048 g 10.3 N 2 380 Gs	0.94 kg / 943 g 9.3 N ~0 Gs
20 mm	0.11 kg / 114 g 1.1 N 784 Gs	0.10 kg / 102 g 1.0 N ~0 Gs
50 mm	0.00 kg / 1 g 0.0 N 90 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two strong neodymiums attract each other from a much further distance than a magnet and sheet combination. The connection of two magnets generates a stronger field and a further horizon of action. Planning to create a powerful holder? Use a pair of magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the impact force is massive. The levitation is slightly lower than the attraction, but still large.
*Flux density in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 12x10x4 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	6.0 cm
Hearing aid	10 Gs (1.0 mT)	4.5 cm
Timepiece	20 Gs (2.0 mT)	3.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Car key	50 Gs (5.0 mT)	2.5 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Extremely neodym field is a real danger to IT equipment and medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Exceptional care must be exercised by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 12x10x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	31.48 km/h (8.74 m/s)	0.14 J
30 mm	54.08 km/h (15.02 m/s)	0.41 J
50 mm	69.81 km/h (19.39 m/s)	0.68 J
100 mm	98.73 km/h (27.42 m/s)	1.35 J

Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or painful pinches to fingers. Always hold the magnet during mounting so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 12x10x4 / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (P_c)
MPL 12x10x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	4 295 Mx	42.9 µWb
P_c Coefficient	0.43	Low (Flat)

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

Table 11: Physics of underwater searching
MPL 12x10x4 / N38

Environment	Effective steel pull	Effect
Air (land)	3.45 kg	Standard
Water (riverbed)	3.95 kg (+0.50 kg Buoyancy gain)	+14.5%

Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Vertical hold

*Caution: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

*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) = 0.43

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.

Engineering data and GPSR

Material specification

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: 020118-2025

Measurement Calculator

Force (pull)

Kilograms (kg)

Force in lbs

Field Strength

Gauss (Gs)

Tesla (T)

Input your value in just one field to see the conversion in all other units right away.

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Model MPL 12x10x4 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 33.88 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, 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 12x10x4 / 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. Thanks to the flat surface and high force (approx. 3.45 kg), they are ideal as closers 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 (12x10 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 12x10x4 mm, which, at a weight of 3.6 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 3.45 kg (force ~33.88 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:

They retain full power for nearly ten years – the drop is just ~1% (based on simulations),
Neodymium magnets are remarkably resistant to magnetic field loss caused by external magnetic fields,
Thanks to the smooth finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
Magnetic induction on the working layer of the magnet turns out to be maximum,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
Due to the ability of flexible shaping and customization to individualized requirements, magnetic components can be modeled in a wide range of geometric configurations, which amplifies use scope,
Universal use in modern industrial fields – they serve a role in hard drives, drive modules, precision medical tools, and multitasking production systems.
Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Problematic aspects of neodymium magnets: application proposals

They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also improves its resistance to damage
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.
They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited possibility of creating threads in the magnet and complex forms - preferred is casing - magnetic holder.
Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical after entering the body.
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?

Holding force of 3.45 kg is a measurement result conducted under the following configuration:

with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
with a thickness of at least 10 mm
with a surface perfectly flat
without any air gap between the magnet and steel
under perpendicular force direction (90-degree angle)
at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

It is worth knowing that the working load will differ influenced by the following factors, starting with the most relevant:

Distance (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, corrosion or dirt).
Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
Steel type – low-carbon steel gives the best results. Higher carbon content lower magnetic permeability and holding force.
Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the load capacity.

H&S for magnets

Fire warning

Powder generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Medical interference

Patients with a ICD must keep an absolute distance from magnets. The magnetism can interfere with the functioning of the life-saving device.

Immense force

Use magnets consciously. Their immense force can surprise even experienced users. Plan your moves and respect their force.

Permanent damage

Watch the temperature. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.

Danger to the youngest

NdFeB magnets are not intended for children. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates urgent medical intervention.

Hand protection

Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Magnetic interference

Remember: neodymium magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, device, and navigation systems.

Metal Allergy

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, prevent direct skin contact and opt for encased magnets.

Keep away from computers

Device Safety: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Fragile material

NdFeB magnets are ceramic materials, which means they are very brittle. Clashing of two magnets leads to them breaking into shards.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?

MPL 12x10x4 / N38 - lamellar magnet

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MPL 12x10x4 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the product - report

1. Vertical hold

2. Efficiency vs thickness

3. Temperature resistance

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

Material specification

Sustainability

Force (pull)

Field Strength

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Advantages and disadvantages of Nd2Fe14B magnets.

Advantages

Limitations

Holding force characteristics

Highest magnetic holding force – what affects it?

Lifting capacity in practice – influencing factors

Fire warning

Medical interference

Immense force

Permanent damage

Danger to the youngest

Hand protection

Magnetic interference

Metal Allergy

Keep away from computers

Fragile material

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages and disadvantages of Nd₂Fe₁₄B magnets.