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MPL 25x15x2 / N38 - lamellar magnet

lamellar magnet

Catalog no 020392

GTIN/EAN: 5906301811893

5.00

length

25 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

2 mm [±0,1 mm]

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

1.89 kg / 18.53 N

Magnetic Induction

120.03 mT / 1200 Gs

Coating

[NiCuNi] Nickel

2.39 with VAT / pcs + price for transport

1.940 ZŁ net + 23% VAT / pcs

bulk discounts:

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Parameters as well as shape of a neodymium magnet can be verified using our magnetic calculator.

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Product card - MPL 25x15x2 / N38 - lamellar magnet

Specification / characteristics - MPL 25x15x2 / N38 - lamellar magnet

properties
properties values
Cat. no. 020392
GTIN/EAN 5906301811893
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 25 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 2 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 1.89 kg / 18.53 N
Magnetic Induction ~ ? 120.03 mT / 1200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x15x2 / 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 analysis of the product - technical parameters

Presented data represent the result of a physical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - characteristics
MPL 25x15x2 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1200 Gs
120.0 mT
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
low risk
1 mm 1144 Gs
114.4 mT
1.72 kg / 3.79 pounds
1717.6 g / 16.8 N
low risk
2 mm 1060 Gs
106.0 mT
1.48 kg / 3.25 pounds
1475.6 g / 14.5 N
low risk
3 mm 961 Gs
96.1 mT
1.21 kg / 2.67 pounds
1212.1 g / 11.9 N
low risk
5 mm 754 Gs
75.4 mT
0.75 kg / 1.65 pounds
746.8 g / 7.3 N
low risk
10 mm 376 Gs
37.6 mT
0.19 kg / 0.41 pounds
185.6 g / 1.8 N
low risk
15 mm 193 Gs
19.3 mT
0.05 kg / 0.11 pounds
48.9 g / 0.5 N
low risk
20 mm 107 Gs
10.7 mT
0.02 kg / 0.03 pounds
15.0 g / 0.1 N
low risk
30 mm 41 Gs
4.1 mT
0.00 kg / 0.00 pounds
2.2 g / 0.0 N
low risk
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
low risk

Table 2: Sliding capacity (vertical surface)
MPL 25x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 pounds
378.0 g / 3.7 N
1 mm Stal (~0.2) 0.34 kg / 0.76 pounds
344.0 g / 3.4 N
2 mm Stal (~0.2) 0.30 kg / 0.65 pounds
296.0 g / 2.9 N
3 mm Stal (~0.2) 0.24 kg / 0.53 pounds
242.0 g / 2.4 N
5 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
10 mm Stal (~0.2) 0.04 kg / 0.08 pounds
38.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 25x15x2 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
0.57 kg / 1.25 pounds
567.0 g / 5.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 pounds
378.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.42 pounds
189.0 g / 1.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.95 kg / 2.08 pounds
945.0 g / 9.3 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 25x15x2 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.19 kg / 0.42 pounds
189.0 g / 1.9 N
1 mm
25%
0.47 kg / 1.04 pounds
472.5 g / 4.6 N
2 mm
50%
0.95 kg / 2.08 pounds
945.0 g / 9.3 N
3 mm
75%
1.42 kg / 3.13 pounds
1417.5 g / 13.9 N
5 mm
100%
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
10 mm
100%
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
11 mm
100%
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
12 mm
100%
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 25x15x2 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
OK
40 °C -2.2% 1.85 kg / 4.08 pounds
1848.4 g / 18.1 N
OK
60 °C -4.4% 1.81 kg / 3.98 pounds
1806.8 g / 17.7 N
80 °C -6.6% 1.77 kg / 3.89 pounds
1765.3 g / 17.3 N
100 °C -28.8% 1.35 kg / 2.97 pounds
1345.7 g / 13.2 N

Table 6: Two magnets (repulsion) - field range
MPL 25x15x2 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 3.33 kg / 7.34 pounds
2 260 Gs
0.50 kg / 1.10 pounds
499 g / 4.9 N
N/A
1 mm 3.20 kg / 7.05 pounds
2 353 Gs
0.48 kg / 1.06 pounds
480 g / 4.7 N
2.88 kg / 6.35 pounds
~0 Gs
2 mm 3.03 kg / 6.67 pounds
2 288 Gs
0.45 kg / 1.00 pounds
454 g / 4.5 N
2.72 kg / 6.00 pounds
~0 Gs
3 mm 2.82 kg / 6.22 pounds
2 210 Gs
0.42 kg / 0.93 pounds
423 g / 4.2 N
2.54 kg / 5.60 pounds
~0 Gs
5 mm 2.37 kg / 5.22 pounds
2 024 Gs
0.36 kg / 0.78 pounds
355 g / 3.5 N
2.13 kg / 4.70 pounds
~0 Gs
10 mm 1.32 kg / 2.90 pounds
1 509 Gs
0.20 kg / 0.44 pounds
197 g / 1.9 N
1.18 kg / 2.61 pounds
~0 Gs
20 mm 0.33 kg / 0.72 pounds
752 Gs
0.05 kg / 0.11 pounds
49 g / 0.5 N
0.29 kg / 0.65 pounds
~0 Gs
50 mm 0.01 kg / 0.02 pounds
128 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
81 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
38 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
28 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
21 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 25x15x2 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.5 cm
Hearing aid 10 Gs (1.0 mT) 5.5 cm
Timepiece 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 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: Dynamics (kinetic energy) - collision effects
MPL 25x15x2 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 19.58 km/h
(5.44 m/s)
0.08 J
30 mm 32.03 km/h
(8.90 m/s)
0.22 J
50 mm 41.32 km/h
(11.48 m/s)
0.37 J
100 mm 58.43 km/h
(16.23 m/s)
0.74 J

Table 9: Coating parameters (durability)
MPL 25x15x2 / 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 25x15x2 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 600 Mx 56.0 µWb
Pc Coefficient 0.14 Low (Flat)

Table 11: Physics of underwater searching
MPL 25x15x2 / N38

Environment Effective steel pull Effect
Air (land) 1.89 kg Standard
Water (riverbed) 2.16 kg
(+0.27 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!
1. Shear force

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Temperature resistance

*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) = 0.14

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 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%
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: 020392-2026
Magnet Unit Converter
Force (pull)

Field Strength

See also deals

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 25x15x2 mm and a weight of 5.63 g, guarantees premium class connection. As a block magnet with high power (approx. 1.89 kg), this product is available immediately from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 25x15x2 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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.
Plate magnets MPL 25x15x2 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 1.89 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 25x15x2 / N38, we recommend utilizing two-component adhesives (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 roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 25x15x2 / N38 model is magnetized axially (dimension 2 mm), which means that the N and S poles are located on its largest, flat surfaces. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. 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: 25 mm (length), 15 mm (width), and 2 mm (thickness). It is a magnetic block with dimensions 25x15x2 mm and a self-weight of 5.63 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 rare earth magnets.

Strengths

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
  • The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
  • Thanks to freedom in designing and the capacity to adapt to client solutions,
  • Wide application in future technologies – they find application in HDD drives, drive modules, medical devices, as well as other advanced devices.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. 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 durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Limited ability of creating nuts in the magnet and complicated forms - preferred is a housing - magnet mounting.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these products are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding forcewhat it depends on?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with a surface perfectly flat
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • in neutral thermal conditions

Practical aspects of lifting capacity – factors

Bear in mind that the working load will differ depending on elements below, in order of importance:
  • Air gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
  • Material type – the best choice is pure iron steel. Hardened steels may attract less.
  • Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Bone fractures

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Avoid contact if allergic

It is widely known 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 coated magnets.

GPS and phone interference

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Magnet fragility

Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

Warning for heart patients

Individuals with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.

Handling rules

Be careful. Rare earth magnets attract from a distance and connect with massive power, often faster than you can react.

Keep away from computers

Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Swallowing risk

Product intended for adults. Small elements pose a choking risk, leading to severe trauma. Store away from kids and pets.

Mechanical processing

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.

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

e-mail: bok@dhit.pl

tel: +48 888 99 98 98