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MPL 3x3x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020147

GTIN/EAN: 5906301811534

5.00
Load capacity 0.36 kg / 3.49 N Magnetic Induction 472.94 mT / 4729 Gs
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
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

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Gross
price from 1 pcs
0.1400 zł
0.1722 zł
price from 10000 pcs
0.1260 zł
0.1550 zł
price from 30000 pcs
0.1162 zł
0.1429 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Detailed specification - 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
Remanence Br ? 12.2-12.6 kGs
Remanence Br ? 1220-1260 mT
Coercivity bHc ? 10.8-11.5 kOe
Coercivity bHc ? 860-915 kA/m
Intrinsic coercivity iHc ≥ 12 kOe
Intrinsic coercivity iHc ≥ 955 kA/m
Energy product BHmax ? 36-38 BH max MGOe
Energy product BHmax ? 287-303 BH max KJ/m
Maximum working temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°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 310 °C
Curie Temperature TF 590 °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 - report

These information constitute the direct effect of a engineering calculation. Results rely on algorithms for the class Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a preliminary roadmap when designing systems.

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

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4719 Gs
471.9 mT
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
weak grip
1 mm 2223 Gs
222.3 mT
0.08 kg / 0.18 LBS
79.9 g / 0.8 N
weak grip
2 mm 966 Gs
96.6 mT
0.02 kg / 0.03 LBS
15.1 g / 0.1 N
weak grip
3 mm 468 Gs
46.8 mT
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
weak grip
5 mm 153 Gs
15.3 mT
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
weak grip
10 mm 26 Gs
2.6 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
15 mm 9 Gs
0.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
20 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
weak grip

Table 2: Shear load (wall)
MPL 3x3x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.07 kg / 0.16 LBS
72.0 g / 0.7 N
1 mm Stal (~0.2) 0.02 kg / 0.04 LBS
16.0 g / 0.2 N
2 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
3 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
5 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
10 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 3x3x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.11 kg / 0.24 LBS
108.0 g / 1.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.07 kg / 0.16 LBS
72.0 g / 0.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.18 kg / 0.40 LBS
180.0 g / 1.8 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 3x3x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
1 mm
25%
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
2 mm
50%
0.18 kg / 0.40 LBS
180.0 g / 1.8 N
3 mm
75%
0.27 kg / 0.60 LBS
270.0 g / 2.6 N
5 mm
100%
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
10 mm
100%
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
11 mm
100%
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
12 mm
100%
0.36 kg / 0.79 LBS
360.0 g / 3.5 N

Table 5: Working in heat (material behavior) - power drop
MPL 3x3x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 0.36 kg / 0.79 LBS
360.0 g / 3.5 N
OK
40 °C -2.2% 0.35 kg / 0.78 LBS
352.1 g / 3.5 N
OK
60 °C -4.4% 0.34 kg / 0.76 LBS
344.2 g / 3.4 N
OK
80 °C -6.6% 0.34 kg / 0.74 LBS
336.2 g / 3.3 N
100 °C -28.8% 0.26 kg / 0.57 LBS
256.3 g / 2.5 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 3x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 1.24 kg / 2.72 LBS
5 677 Gs
0.19 kg / 0.41 LBS
185 g / 1.8 N
N/A
1 mm 0.63 kg / 1.38 LBS
6 725 Gs
0.09 kg / 0.21 LBS
94 g / 0.9 N
0.56 kg / 1.24 LBS
~0 Gs
2 mm 0.27 kg / 0.60 LBS
4 447 Gs
0.04 kg / 0.09 LBS
41 g / 0.4 N
0.25 kg / 0.54 LBS
~0 Gs
3 mm 0.12 kg / 0.26 LBS
2 903 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
0.11 kg / 0.23 LBS
~0 Gs
5 mm 0.02 kg / 0.05 LBS
1 324 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.02 kg / 0.05 LBS
~0 Gs
10 mm 0.00 kg / 0.00 LBS
306 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
20 mm 0.00 kg / 0.00 LBS
52 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
4 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
2 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
2 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
1 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
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
Mechanical watch 20 Gs (2.0 mT) 1.5 cm
Phone / Smartphone 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

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

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.94 km/h
(6.09 m/s)
0.00 J
30 mm 21.94 km/h
(6.09 m/s)
0.00 J
50 mm 21.93 km/h
(6.09 m/s)
0.00 J
100 mm 21.94 km/h
(6.10 m/s)
0.00 J

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)

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

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

Table 11: Hydrostatics and buoyancy
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%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

1. Shear force

*Warning: On a vertical surface, the magnet holds just ~20% of its nominal pull.

2. Steel thickness impact

*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.

3. Thermal stability

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (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 Pc (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 Pc 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 and environmental data

Chemical composition

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: 020147-2026
Measurement Calculator

Force (pull)


Magnetic Field

See also proposals

Component MPL 3x3x2 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 3.49 N is ready for shipment in 24h, allowing for rapid realization of your project. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 3x3x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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. 0.36 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. 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 roughen and wash 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
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 protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even during around 10 years – the decrease in power is only ~1% (theoretically),
  • Neodymium magnets remain extremely resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a smooth gold surface looks better,
  • Magnetic induction on the working layer of the magnet turns out to be very high,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
  • Considering the potential of flexible molding and adaptation to specialized needs, neodymium magnets can be manufactured in a broad palette of shapes and sizes, which expands the range of possible applications,
  • Fundamental importance in innovative solutions – they serve a role in magnetic memories, electric drive systems, advanced medical instruments, also technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which enables their usage in compact constructions

Cons

What to avoid - cons of neodymium magnets: application proposals
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their force 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
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of creating threads in the magnet and complicated shapes - recommended is a housing - magnet mounting.
  • Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what it depends on?

Magnet power is the result of a measurement for the most favorable conditions, taking into account:
  • using a sheet made of high-permeability steel, functioning as a magnetic yoke
  • with a thickness minimum 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at room temperature

Practical lifting capacity: influencing factors

Please note that the magnet holding will differ influenced by elements below, in order of importance:
  • Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – not every steel reacts the same. High carbon content worsen the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

H&S for magnets
Combustion hazard

Mechanical processing of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Material brittleness

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Life threat

For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Electronic hazard

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Hand protection

Pinching hazard: The pulling power is so immense that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Skin irritation risks

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If redness occurs, cease handling magnets and wear gloves.

Swallowing risk

Adult use only. Small elements pose a choking risk, causing severe trauma. Keep out of reach of children and animals.

Demagnetization risk

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

Handling rules

Use magnets consciously. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.

Keep away from electronics

Be aware: rare earth magnets produce a field that interferes with sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Attention! Need more info? Read our article: Why are neodymium magnets dangerous?