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MPL 3x3x3 / 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 020148

GTIN/EAN: 5906301811541

5.00

length

3 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

0.2 g

Magnetization Direction

↑ axial

Load capacity

0.34 kg / 3.37 N

Magnetic Induction

538.48 mT / 5385 Gs

Coating

[NiCuNi] Nickel

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0.1845 ZŁ with VAT / pcs + price for transport

0.1500 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MPL 3x3x3 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x3 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020148
GTIN/EAN	5906301811541
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	3 mm [±0,1 mm]
Width	3 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	0.2 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.34 kg / 3.37 N
Magnetic Induction ~ ?	538.48 mT / 5385 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x3 / 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

Engineering simulation of the magnet - technical parameters

The following values represent the outcome of a mathematical analysis. Values rely on models for the class Nd₂Fe₁₄B. Operational parameters may deviate from the simulation results. Use these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 3x3x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5372 Gs 537.2 mT	0.34 kg / 340.0 g 3.3 N	low risk
1 mm	2530 Gs 253.0 mT	0.08 kg / 75.4 g 0.7 N	low risk
2 mm	1127 Gs 112.7 mT	0.01 kg / 15.0 g 0.1 N	low risk
3 mm	562 Gs 56.2 mT	0.00 kg / 3.7 g 0.0 N	low risk
5 mm	192 Gs 19.2 mT	0.00 kg / 0.4 g 0.0 N	low risk
10 mm	35 Gs 3.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
15 mm	12 Gs 1.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
20 mm	5 Gs 0.5 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	2 Gs 0.2 mT	0.00 kg / 0.0 g 0.0 N	low risk
50 mm	0 Gs 0.0 mT	0.00 kg / 0.0 g 0.0 N	low risk

Grip strength decreases drastically per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, varnish, veneer) noticeably reduces the pull force. Magnetic products operate optimally in perfect adhesion; gap nullifies the power. See how flashily the parameters plummet, when the product does not touch flatly to the metal substrate. When planning the assembly, eliminate additional spacers.

Table 2: Vertical capacity (wall)
MPL 3x3x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.07 kg / 68.0 g 0.7 N
1 mm	Stal (~0.2)	0.02 kg / 16.0 g 0.2 N
2 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
3 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
5 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
10 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
15 mm	Stal (~0.2)	0.00 kg / 0.0 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 calculates the approximate weight limit necessary to start the shifting of the magnet downwards against a upright metal surface (considering standard friction). This parameter depends on the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 3x3x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.10 kg / 102.0 g 1.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.07 kg / 68.0 g 0.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.03 kg / 34.0 g 0.3 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.17 kg / 170.0 g 1.7 N

When mounting a holder on a vertical wall (e.g., a car body), it you can count on just about 20%-30% of its maximum pull force. Gravity and a low friction coefficient influence the fact that holders slip easier than they pull off. Planning a wall mount? Note that the shear force is much weaker than the maximum static pull force. On a slippery surface, the magnet will give way down under a noticeably lighter cargo. Utilizing a rubberized pad can drastically raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 3x3x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.03 kg / 34.0 g 0.3 N
1 mm	25%	0.09 kg / 85.0 g 0.8 N
2 mm	50%	0.17 kg / 170.0 g 1.7 N
5 mm	100%	0.34 kg / 340.0 g 3.3 N
10 mm	100%	0.34 kg / 340.0 g 3.3 N

A thin metal plate cannot focus the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a weak sheet, the magnetism will pass right through and the holding will be smaller. To utilize 100% of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 3x3x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.34 kg / 340.0 g 3.3 N	OK
40 °C	-2.2%	0.33 kg / 332.5 g 3.3 N	OK
60 °C	-4.4%	0.33 kg / 325.0 g 3.2 N	OK
80 °C	-6.6%	0.32 kg / 317.6 g 3.1 N
100 °C	-28.8%	0.24 kg / 242.1 g 2.4 N

Ordinary NdFeB products lose parameters after exceeding the maximum temperature. Protect against heat – excessive heat can irreversibly damage this magnet. With increasing heat, the magnet's power momentarily drops. Do not use this product close to heaters higher than its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Technical advisory: Thermal stability depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) risk losing magnetic properties at lower temperatures than long magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 3x3x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	1.60 kg / 1601 g 15.7 N 5 931 Gs	N/A
1 mm	0.80 kg / 803 g 7.9 N 7 610 Gs	0.72 kg / 723 g 7.1 N ~0 Gs
2 mm	0.36 kg / 355 g 3.5 N 5 061 Gs	0.32 kg / 320 g 3.1 N ~0 Gs
3 mm	0.15 kg / 155 g 1.5 N 3 343 Gs	0.14 kg / 139 g 1.4 N ~0 Gs
5 mm	0.03 kg / 34 g 0.3 N 1 568 Gs	0.03 kg / 31 g 0.3 N ~0 Gs
10 mm	0.00 kg / 2 g 0.0 N 384 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
20 mm	0.00 kg / 0 g 0.0 N 70 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 6 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets attract each other from a significantly greater distance than a magnet and steel setup. The connection of two magnets creates a more powerful interaction and a further horizon of action. Designing a solid fastener? Utilize two neodymiums instead of a neodymium and a striker plate. Remember that when attracting two neodymiums, the impact force is huge. The repulsion force is marginally weaker than the connection force, but still large.
*Field value in repulsion mode reaches ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Safety (HSE) (implants) - warnings
MPL 3x3x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	2.5 cm
Hearing aid	10 Gs (1.0 mT)	2.0 cm
Timepiece	20 Gs (2.0 mT)	1.5 cm
Mobile device	40 Gs (4.0 mT)	1.0 cm
Remote	50 Gs (5.0 mT)	1.0 cm
Payment card	400 Gs (40.0 mT)	0.5 cm
HDD hard drive	600 Gs (60.0 mT)	0.5 cm

A strong magnetic field poses a real danger to electronics as well as pacemakers. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Exceptional care must be exercised by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, membranes, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MPL 3x3x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	41.58 km/h (11.55 m/s)	0.01 J
30 mm	72.02 km/h (20.01 m/s)	0.04 J
50 mm	92.98 km/h (25.83 m/s)	0.07 J
100 mm	131.49 km/h (36.53 m/s)	0.13 J

Neodymium magnets are prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or dangerous crushing to skin. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Surface protection spec
MPL 3x3x3 / 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 (P_c)
MPL 3x3x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	495 Mx	5.0 µWb
P_c Coefficient	0.84	High (Stable)

Flux value emitted by the pole surface. Essential parameter for generator designers and motors. The P_c coefficient defines the working geometry.

Table 11: Submerged application
MPL 3x3x3 / N38

Environment	Effective steel pull	Effect
Air (land)	0.34 kg	Standard
Water (riverbed)	0.39 kg (+0.05 kg Buoyancy gain)	+14.5%

Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

In water, the magnet feels stronger thanks to Archimedes' principle. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Thermal stability

*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) = 0.84

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

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: 020148-2025

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MPL 50x20x5 / N38 - lamellar magnet

14.56 ZŁ brutto / pcs

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 3x3x3 mm and a weight of 0.2 g, guarantees premium class connection. As a magnetic bar with high power (approx. 0.34 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. Watch your fingers! Magnets with a force of 0.34 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 0.34 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.

For mounting flat magnets MPL 3x3x3 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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 3x3x3 / N38 model is magnetized through the thickness (dimension 3 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 (3x3 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 3x3x3 mm, which, at a weight of 0.2 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 0.34 kg (force ~3.37 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Advantages

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

They do not lose magnetism, even over approximately ten years – the decrease in power is only ~1% (based on measurements),
They are noted for resistance to demagnetization induced by external field influence,
In other words, due to the smooth layer of nickel, the element looks attractive,
Neodymium magnets ensure maximum magnetic induction on a their surface, which increases force concentration,
Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
Thanks to freedom in shaping and the capacity to adapt to specific needs,
Key role in future technologies – they serve a role in computer drives, brushless drives, medical equipment, and other advanced devices.
Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Limitations

What to avoid - cons of neodymium magnets: application proposals

At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
We suggest a housing - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated forms.
Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
With budget limitations the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

The specified lifting capacity concerns the peak performance, measured under laboratory conditions, namely:

on a block made of structural steel, optimally conducting the magnetic flux
with a cross-section no less than 10 mm
with a plane free of scratches
without any clearance between the magnet and steel
during pulling in a direction vertical to the plane
at standard ambient temperature

Practical aspects of lifting capacity – factors

Please note that the working load may be lower influenced by elements below, starting with the most relevant:

Gap between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Warnings

Fire risk

Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this risks ignition.

Beware of splinters

Beware of splinters. Magnets can explode upon violent connection, ejecting shards into the air. We recommend safety glasses.

Cards and drives

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.

Maximum temperature

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

Pinching danger

Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two strong magnets.

Swallowing risk

Adult use only. Tiny parts can be swallowed, leading to intestinal necrosis. Keep away from kids and pets.

Nickel allergy

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, avoid touching magnets with bare hands and select encased magnets.

Precision electronics

A strong magnetic field interferes with the operation of magnetometers in smartphones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Medical interference

People with a pacemaker should keep an safe separation from magnets. The magnetic field can interfere with the functioning of the life-saving device.

Handling rules

Before use, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Safety First! Looking for details? Check our post: Why are neodymium magnets dangerous?

MPL 3x3x3 / N38 - lamellar magnet

Technical specification of the product - MPL 3x3x3 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the magnet - technical parameters

Table 1: Static force (pull vs distance) - characteristics MPL 3x3x3 / N38

Table 2: Vertical capacity (wall) MPL 3x3x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull MPL 3x3x3 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MPL 3x3x3 / N38

Table 5: Thermal resistance (material behavior) - thermal limit MPL 3x3x3 / N38

Table 6: Two magnets (attraction) - field collision MPL 3x3x3 / N38

Table 7: Safety (HSE) (implants) - warnings MPL 3x3x3 / N38

Table 8: Collisions (cracking risk) - collision effects MPL 3x3x3 / N38

Table 9: Surface protection spec MPL 3x3x3 / N38

Table 10: Construction data (Pc) MPL 3x3x3 / N38

Table 11: Submerged application MPL 3x3x3 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Thermal stability

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

Elemental analysis

Sustainability

Magnet pull force

Magnetic Field

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MW 15x5 / N38 - cylindrical magnet

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MPL 50x20x5 / N38 - lamellar magnet

Pros and cons of rare earth magnets.

Advantages

Limitations

Holding force characteristics

Maximum magnetic pulling force – what contributes to it?

Practical aspects of lifting capacity – factors

Warnings

Fire risk

Beware of splinters

Cards and drives

Maximum temperature

Pinching danger

Swallowing risk

Nickel allergy

Precision electronics

Medical interference

Handling rules

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - characteristics
MPL 3x3x3 / N38

Table 2: Vertical capacity (wall)
MPL 3x3x3 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MPL 3x3x3 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 3x3x3 / N38

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 3x3x3 / N38

Table 6: Two magnets (attraction) - field collision
MPL 3x3x3 / N38

Table 7: Safety (HSE) (implants) - warnings
MPL 3x3x3 / N38

Table 8: Collisions (cracking risk) - collision effects
MPL 3x3x3 / N38

Table 9: Surface protection spec
MPL 3x3x3 / N38

Table 10: Construction data (P_c)
MPL 3x3x3 / N38

Table 11: Submerged application
MPL 3x3x3 / N38