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MPL 3x3x2 / N38 - lamellar magnet

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

0.1722 with VAT / pcs + price for transport

0.1400 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
0.1400 ZŁ
0.1722 ZŁ
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price from 30000 pcs
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0.1429 ZŁ
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Technical of the product - 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

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 magnet - report

These values constitute the result of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Please consider these calculations as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - interaction chart
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
safe
1 mm 2223 Gs
222.3 mT
0.08 kg / 0.18 LBS
79.9 g / 0.8 N
safe
2 mm 966 Gs
96.6 mT
0.02 kg / 0.03 LBS
15.1 g / 0.1 N
safe
3 mm 468 Gs
46.8 mT
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
safe
5 mm 153 Gs
15.3 mT
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
safe
10 mm 26 Gs
2.6 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
15 mm 9 Gs
0.9 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
20 mm 4 Gs
0.4 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
30 mm 1 Gs
0.1 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe
50 mm 0 Gs
0.0 mT
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
safe

Table 2: Slippage capacity (vertical surface)
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: Material efficiency (substrate influence) - sheet metal selection
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 (stability) - thermal limit
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 range
MPL 3x3x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (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) - 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
Car key 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: Dynamics (kinetic energy) - collision effects
MPL 3x3x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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

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: Construction 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: Submerged application
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. Vertical hold

*Warning: On a vertical wall, the magnet holds just a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.66

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 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 specification and ecology
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%
Ecology and recycling (GPSR)
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
Pulling force

Magnetic Field

Other products

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 3x3x2 mm and a weight of 0.13 g, guarantees the highest quality connection. As a block magnet with high power (approx. 0.36 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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. 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. 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. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 3x3x2 mm, which, at a weight of 0.13 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 0.36 kg (force ~3.49 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Benefits

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets remain exceptionally resistant to magnetic field loss caused by external field sources,
  • By applying a reflective layer of silver, the element has an elegant look,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • Neodymium magnets are characterized by very 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...
  • Thanks to modularity in shaping and the ability to customize to client solutions,
  • Universal use in innovative solutions – they are commonly used in magnetic memories, electric drive systems, medical equipment, and modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

What to avoid - cons of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • Limited ability of making nuts in the magnet and complicated forms - recommended is casing - magnet mounting.
  • Health risk to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, small components of these magnets can disrupt the diagnostic process medical when they are in the body.
  • 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 parameterswhat contributes to it?

Information about lifting capacity was determined for ideal contact conditions, assuming:
  • on a block made of structural steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • with zero gap (without paint)
  • for force applied at a right angle (in the magnet axis)
  • in stable room temperature

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower subject to elements below, starting with the most relevant:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet exhibits much less (typically approx. 20-30% of nominal force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Steel type – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was assessed by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under parallel forces the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate reduces the holding force.

H&S for magnets
Pacemakers

Life threat: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.

Conscious usage

Use magnets with awareness. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their force.

Fire risk

Powder created during grinding of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Physical harm

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

Risk of cracking

Neodymium magnets are sintered ceramics, which means they are very brittle. Impact of two magnets leads to them shattering into shards.

Do not overheat magnets

Watch the temperature. Exposing the magnet to high heat will destroy its properties and strength.

Threat to navigation

Navigation devices and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the internal compass in your phone.

Adults only

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Avoid contact if allergic

Studies show that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands and choose encased magnets.

Cards and drives

Device Safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Caution! Need more info? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98