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MPL 3x3x2 / 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 020147

GTIN/EAN: 5906301811534

5.00

length

3 mm [±0,1 mm]

Width

3 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

0.13 g

Magnetization Direction

↑ axial

Load capacity

0.36 kg / 3.49 N

Magnetic Induction

472.94 mT / 4729 Gs

Coating

[NiCuNi] Nickel

technical details »

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Lifting power along with form of neodymium magnets can be analyzed with our online calculation tool.

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Technical parameters - MPL 3x3x2 / N38 - lamellar magnet

Specification / characteristics - MPL 3x3x2 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020147
GTIN/EAN	5906301811534
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	2 mm [±0,1 mm]
Weight	0.13 g
Magnetization Direction	↑ axial
Load capacity ~ ?	0.36 kg / 3.49 N
Magnetic Induction ~ ?	472.94 mT / 4729 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 3x3x2 / 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 magnet - technical parameters

The following values are the outcome of a physical simulation. Results are based on algorithms for the material Nd₂Fe₁₄B. Actual conditions might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 3x3x2 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	4719 Gs 471.9 mT	0.36 kg / 360.0 g 3.5 N	low risk
1 mm	2223 Gs 222.3 mT	0.08 kg / 79.9 g 0.8 N	low risk
2 mm	966 Gs 96.6 mT	0.02 kg / 15.1 g 0.1 N	low risk
3 mm	468 Gs 46.8 mT	0.00 kg / 3.5 g 0.0 N	low risk
5 mm	153 Gs 15.3 mT	0.00 kg / 0.4 g 0.0 N	low risk
10 mm	26 Gs 2.6 mT	0.00 kg / 0.0 g 0.0 N	low risk
15 mm	9 Gs 0.9 mT	0.00 kg / 0.0 g 0.0 N	low risk
20 mm	4 Gs 0.4 mT	0.00 kg / 0.0 g 0.0 N	low risk
30 mm	1 Gs 0.1 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

Magnetic force drops significantly per each millimeter of gap. Remember that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably diminishes the holding power. Neodymiums hold strongest during direct contact; air break drastically cuts the force. Observe how quickly the load capacity drop, when the magnet does not touch directly to the steel surface. When designing the assembly, avoid unnecessary gaps.

Table 2: Shear force (vertical surface)
MPL 3x3x2 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	0.07 kg / 72.0 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 / 4.0 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 presents the estimated weight limit sufficient to start the slippage of the magnet down against a upright steel wall (assuming standard friction). The holding force is relative to the separation distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 3x3x2 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	0.11 kg / 108.0 g 1.1 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	0.07 kg / 72.0 g 0.7 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.04 kg / 36.0 g 0.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	0.18 kg / 180.0 g 1.8 N

When mounting a holder on a upright plane (e.g., a fridge), it will maintain just approx. 20%-30% of its nominal power. Gravity and a weak degree of grip influence the fact that holders slip faster than they detach. Designing a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a smooth steel, the holder will slip down under a noticeably lighter cargo. Application of an anti-slip layer can effectively raise the stability.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 3x3x2 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.04 kg / 36.0 g 0.4 N
1 mm	25%	0.09 kg / 90.0 g 0.9 N
2 mm	50%	0.18 kg / 180.0 g 1.8 N
5 mm	100%	0.36 kg / 360.0 g 3.5 N
10 mm	100%	0.36 kg / 360.0 g 3.5 N

A thin metal plate is incapable of absorb the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the flux will pass right through and the attraction force will be weaker. To utilize 100% of this magnet's potential, you need a suitably thick piece of steel. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet shows lower pull force. We advise picking the steel dimension from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
MPL 3x3x2 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	0.36 kg / 360.0 g 3.5 N	OK
40 °C	-2.2%	0.35 kg / 352.1 g 3.5 N	OK
60 °C	-4.4%	0.34 kg / 344.2 g 3.4 N	OK
80 °C	-6.6%	0.34 kg / 336.2 g 3.3 N
100 °C	-28.8%	0.26 kg / 256.3 g 2.5 N

Standard neodymium magnets change their properties power after exceeding the maximum temperature. Protect against heat – heat can irreversibly damage this magnet. As the temperature rises, the magnet's capacity briefly decreases. Do not use this magnet close to ovens exceeding its working range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently at lower temperatures than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MPL 3x3x2 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	1.24 kg / 1236 g 12.1 N 5 677 Gs	N/A
1 mm	0.63 kg / 627 g 6.2 N 6 725 Gs	0.56 kg / 565 g 5.5 N ~0 Gs
2 mm	0.27 kg / 274 g 2.7 N 4 447 Gs	0.25 kg / 247 g 2.4 N ~0 Gs
3 mm	0.12 kg / 117 g 1.1 N 2 903 Gs	0.11 kg / 105 g 1.0 N ~0 Gs
5 mm	0.02 kg / 24 g 0.2 N 1 324 Gs	0.02 kg / 22 g 0.2 N ~0 Gs
10 mm	0.00 kg / 1 g 0.0 N 306 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
20 mm	0.00 kg / 0 g 0.0 N 52 Gs	0.00 kg / 0 g 0.0 N ~0 Gs
50 mm	0.00 kg / 0 g 0.0 N 4 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products attract each other from a much further distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a wider radius of performance. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a steel. Exercise caution that when bringing together two magnets, the impact force is huge. The repulsion force is marginally weaker than the connection force, but still significant.
*Field value for N-N configuration reaches ~0 Gs at the midpoint of the gap (due to field cancellation).

Table 7: Hazards (electronics) - precautionary measures
MPL 3x3x2 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	2.0 cm
Hearing aid	10 Gs (1.0 mT)	1.5 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

Powerful magnet radiation is a large risk to electronics as well as medical implants. These NdFeB products generate a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MPL 3x3x2 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	53.07 km/h (14.74 m/s)	0.01 J
30 mm	91.92 km/h (25.53 m/s)	0.04 J
50 mm	118.67 km/h (32.96 m/s)	0.07 J
100 mm	167.83 km/h (46.62 m/s)	0.14 J

Magnetic elements are prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit violently against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear safety glasses when working with large magnets.

Table 9: Corrosion resistance
MPL 3x3x2 / 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 3x3x2 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	429 Mx	4.3 µWb
P_c Coefficient	0.66	High (Stable)

Total magnetic flux emitted by the magnet pole. Key data in coil applications as well as sensors. P_c value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 3x3x2 / N38

Environment	Effective steel pull	Effect
Air (land)	0.36 kg	Standard
Water (riverbed)	0.41 kg (+0.05 kg Buoyancy gain)	+14.5%

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

Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.

1. Wall mount (shear)

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

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) significantly weakens the holding force.

3. Thermal stability

*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) = 0.66

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.

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%

Environmental data

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: 020147-2025

Measurement Calculator

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Model MPL 3x3x2 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 3.49 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

The key to success is shifting 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 0.36 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 generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.

For mounting flat magnets MPL 3x3x2 / N38, it is best to use strong epoxy glues (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. 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 3x3x2 / N38 model is magnetized axially (dimension 2 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. This is the most popular configuration for block magnets used in separators and holders.

The presented product is a neodymium magnet with precisely defined parameters: 3 mm (length), 3 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 3x3x2 mm and a self-weight of 0.13 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:

They do not lose magnetism, even over nearly 10 years – the decrease in power is only ~1% (based on measurements),
They retain their magnetic properties even under external field action,
In other words, due to the shiny surface of silver, the element is aesthetically pleasing,
Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
Possibility of individual modeling and modifying to defined needs,
Key role in modern industrial fields – they are used in computer drives, electric motors, medical devices, and multitasking production systems.
Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Problematic aspects of neodymium magnets: weaknesses and usage proposals

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
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 and 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 start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
Limited ability of creating threads in the magnet and complex forms - recommended is a housing - mounting mechanism.
Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these magnets can be problematic in diagnostics medical after entering the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding force – what contributes to it?

The load parameter shown concerns the limit force, recorded under laboratory conditions, namely:

using a sheet made of low-carbon steel, serving as a magnetic yoke
with a thickness no less than 10 mm
with a plane perfectly flat
under conditions of ideal adhesion (metal-to-metal)
under vertical force vector (90-degree angle)
in neutral thermal conditions

Lifting capacity in real conditions – factors

In real-world applications, the actual lifting capacity is determined by several key aspects, presented from crucial:

Clearance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of maximum force).
Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Metal type – not every steel attracts identically. High carbon content worsen the attraction effect.
Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
Thermal environment – heating the magnet 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, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.

Safety rules for work with NdFeB magnets

Implant safety

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have electronic implants.

Physical harm

Risk of injury: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Protective gloves are recommended.

Beware of splinters

Neodymium magnets are ceramic materials, which means they are prone to chipping. Impact of two magnets will cause them breaking into small pieces.

Fire warning

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

Immense force

Before starting, check safety instructions. Sudden snapping can break the magnet or injure your hand. Think ahead.

Heat warning

Do not overheat. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).

Electronic devices

Device Safety: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Impact on smartphones

Note: rare earth magnets produce a field that confuses precision electronics. Keep a separation from your phone, tablet, and GPS.

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands or choose encased magnets.

Danger to the youngest

NdFeB magnets are not toys. Swallowing multiple magnets can lead to them pinching intestinal walls, which constitutes a severe health hazard and necessitates immediate surgery.

Safety First! Need more info? Check our post: Are neodymium magnets dangerous?

MPL 3x3x2 / N38 - lamellar magnet

Technical parameters - MPL 3x3x2 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the magnet - technical parameters

Table 1: Static pull force (force vs gap) - interaction chart MPL 3x3x2 / N38

Table 2: Shear force (vertical surface) MPL 3x3x2 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces MPL 3x3x2 / N38

Table 4: Material efficiency (saturation) - sheet metal selection MPL 3x3x2 / N38

Table 5: Thermal stability (stability) - resistance threshold MPL 3x3x2 / N38

Table 6: Two magnets (repulsion) - field collision MPL 3x3x2 / N38

Table 7: Hazards (electronics) - precautionary measures MPL 3x3x2 / N38

Table 8: Impact energy (cracking risk) - warning MPL 3x3x2 / N38

Table 9: Corrosion resistance MPL 3x3x2 / N38

Table 10: Construction data (Pc) MPL 3x3x2 / N38

Table 11: Underwater work (magnet fishing) MPL 3x3x2 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Thermal stability

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

Elemental analysis

Environmental data

Magnet pull force

Magnetic Induction

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Strengths as well as weaknesses of rare earth magnets.

Strengths

Limitations

Lifting parameters

Highest magnetic holding force – what contributes to it?

Lifting capacity in real conditions – factors

Safety rules for work with NdFeB magnets

Implant safety

Physical harm

Beware of splinters

Fire warning

Immense force

Heat warning

Electronic devices

Impact on smartphones

Skin irritation risks

Danger to the youngest

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs gap) - interaction chart
MPL 3x3x2 / N38

Table 2: Shear force (vertical surface)
MPL 3x3x2 / N38

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 3x3x2 / N38

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 3x3x2 / N38

Table 5: Thermal stability (stability) - resistance threshold
MPL 3x3x2 / N38

Table 6: Two magnets (repulsion) - field collision
MPL 3x3x2 / N38

Table 7: Hazards (electronics) - precautionary measures
MPL 3x3x2 / N38

Table 8: Impact energy (cracking risk) - warning
MPL 3x3x2 / N38

Table 9: Corrosion resistance
MPL 3x3x2 / N38

Table 10: Construction data (P_c)
MPL 3x3x2 / N38

Table 11: Underwater work (magnet fishing)
MPL 3x3x2 / N38