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MPL 30x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020140

GTIN/EAN: 5906301811466

5.00

length

30 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

6.75 g

Magnetization Direction

↑ axial

Load capacity

2.11 kg / 20.74 N

Magnetic Induction

115.11 mT / 1151 Gs

Coating

[NiCuNi] Nickel

3.89 with VAT / pcs + price for transport

3.16 ZŁ net + 23% VAT / pcs

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Technical specification of the product - MPL 30x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020140
GTIN/EAN 5906301811466
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 30 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 6.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 2.11 kg / 20.74 N
Magnetic Induction ~ ? 115.11 mT / 1151 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x15x2 / 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

Physical modeling of the magnet - data

The following data are the outcome of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Actual performance might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MPL 30x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg) Risk Status
0 mm 1151 Gs
115.1 mT
2.11 kg / 2110.0 g
20.7 N
strong
1 mm 1098 Gs
109.8 mT
1.92 kg / 1920.5 g
18.8 N
weak grip
2 mm 1019 Gs
101.9 mT
1.65 kg / 1654.9 g
16.2 N
weak grip
3 mm 926 Gs
92.6 mT
1.37 kg / 1365.9 g
13.4 N
weak grip
5 mm 733 Gs
73.3 mT
0.86 kg / 855.2 g
8.4 N
weak grip
10 mm 379 Gs
37.9 mT
0.23 kg / 228.8 g
2.2 N
weak grip
15 mm 203 Gs
20.3 mT
0.07 kg / 65.6 g
0.6 N
weak grip
20 mm 116 Gs
11.6 mT
0.02 kg / 21.6 g
0.2 N
weak grip
30 mm 46 Gs
4.6 mT
0.00 kg / 3.4 g
0.0 N
weak grip
50 mm 12 Gs
1.2 mT
0.00 kg / 0.2 g
0.0 N
weak grip

Table 2: Vertical force (vertical surface)
MPL 30x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg)
0 mm Stal (~0.2) 0.42 kg / 422.0 g
4.1 N
1 mm Stal (~0.2) 0.38 kg / 384.0 g
3.8 N
2 mm Stal (~0.2) 0.33 kg / 330.0 g
3.2 N
3 mm Stal (~0.2) 0.27 kg / 274.0 g
2.7 N
5 mm Stal (~0.2) 0.17 kg / 172.0 g
1.7 N
10 mm Stal (~0.2) 0.05 kg / 46.0 g
0.5 N
15 mm Stal (~0.2) 0.01 kg / 14.0 g
0.1 N
20 mm Stal (~0.2) 0.00 kg / 4.0 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

Table 3: Wall mounting (sliding) - vertical pull
MPL 30x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.63 kg / 633.0 g
6.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.42 kg / 422.0 g
4.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.21 kg / 211.0 g
2.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
1.06 kg / 1055.0 g
10.3 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x15x2 / N38

Steel thickness (mm) % power Real pull force (kg)
0.5 mm
10%
0.21 kg / 211.0 g
2.1 N
1 mm
25%
0.53 kg / 527.5 g
5.2 N
2 mm
50%
1.06 kg / 1055.0 g
10.3 N
5 mm
100%
2.11 kg / 2110.0 g
20.7 N
10 mm
100%
2.11 kg / 2110.0 g
20.7 N

Table 5: Thermal stability (stability) - thermal limit
MPL 30x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull Status
20 °C 0.0% 2.11 kg / 2110.0 g
20.7 N
OK
40 °C -2.2% 2.06 kg / 2063.6 g
20.2 N
OK
60 °C -4.4% 2.02 kg / 2017.2 g
19.8 N
80 °C -6.6% 1.97 kg / 1970.7 g
19.3 N
100 °C -28.8% 1.50 kg / 1502.3 g
14.7 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 30x15x2 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 3.67 kg / 3675 g
36.1 N
2 169 Gs
N/A
1 mm 3.53 kg / 3533 g
34.7 N
2 257 Gs
3.18 kg / 3180 g
31.2 N
~0 Gs
2 mm 3.34 kg / 3345 g
32.8 N
2 196 Gs
3.01 kg / 3010 g
29.5 N
~0 Gs
3 mm 3.12 kg / 3124 g
30.6 N
2 122 Gs
2.81 kg / 2812 g
27.6 N
~0 Gs
5 mm 2.63 kg / 2631 g
25.8 N
1 948 Gs
2.37 kg / 2368 g
23.2 N
~0 Gs
10 mm 1.49 kg / 1490 g
14.6 N
1 465 Gs
1.34 kg / 1341 g
13.2 N
~0 Gs
20 mm 0.40 kg / 398 g
3.9 N
758 Gs
0.36 kg / 359 g
3.5 N
~0 Gs
50 mm 0.01 kg / 14 g
0.1 N
142 Gs
0.01 kg / 13 g
0.1 N
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MPL 30x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 7.0 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.5 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Collisions (cracking risk) - collision effects
MPL 30x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.00 km/h
(5.28 m/s)
0.09 J
30 mm 30.91 km/h
(8.59 m/s)
0.25 J
50 mm 39.87 km/h
(11.08 m/s)
0.41 J
100 mm 56.39 km/h
(15.66 m/s)
0.83 J

Table 9: Anti-corrosion coating durability
MPL 30x15x2 / 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 (Flux)
MPL 30x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 6 236 Mx 62.4 µWb
Pc Coefficient 0.13 Low (Flat)

Table 11: Submerged application
MPL 30x15x2 / N38

Environment Effective steel pull Effect
Air (land) 2.11 kg Standard
Water (riverbed) 2.42 kg
(+0.31 kg Buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Warning: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Power loss vs temp

*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) = 0.13

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 and environmental data
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%
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: 020140-2025
Measurement Calculator
Magnet pull force

Field Strength

Other products

Model MPL 30x15x2 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 20.74 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.
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 30x15x2 / 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.
Plate magnets MPL 30x15x2 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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).
Standardly, the MPL 30x15x2 / N38 model is magnetized through the thickness (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 (30x15 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: 30 mm (length), 15 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 30x15x2 mm and a self-weight of 6.75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of rare earth magnets.

Benefits

Besides their tremendous pulling force, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even after nearly ten years – the drop in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by external interference,
  • In other words, due to the metallic finish of gold, the element gains visual value,
  • Magnets possess excellent magnetic induction on the surface,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Considering the possibility of accurate shaping and adaptation to specialized projects, NdFeB magnets can be modeled in a wide range of forms and dimensions, which expands the range of possible applications,
  • Versatile presence in modern technologies – they find application in data components, drive modules, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited ability of creating threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Holding force characteristics

Best holding force of the magnet in ideal parameterswhat contributes to it?

The declared magnet strength represents the peak performance, recorded under optimal environment, meaning:
  • with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • with a cross-section of at least 10 mm
  • with an polished touching surface
  • under conditions of no distance (metal-to-metal)
  • under axial force vector (90-degree angle)
  • at room temperature

Practical aspects of lifting capacity – factors

Bear in mind that the application force may be lower influenced by the following factors, starting with the most relevant:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate lowers the load capacity.

Warnings
Material brittleness

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets leads to them shattering into shards.

Electronic devices

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Implant safety

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

Skin irritation risks

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, prevent touching magnets with bare hands and opt for coated magnets.

Precision electronics

Navigation devices and mobile phones are highly susceptible to magnetism. Close proximity with a strong magnet can permanently damage the sensors in your phone.

Finger safety

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two strong magnets.

Handling guide

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Flammability

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Permanent damage

Standard neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Keep away from children

These products are not toys. Accidental ingestion of a few magnets may result in them attracting across intestines, which constitutes a severe health hazard and necessitates urgent medical intervention.

Warning! 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