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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

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Technical data of the product - 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 modeling of the magnet - report

The following values represent the outcome of a physical calculation. Results were calculated on models for the class Nd2Fe14B. Operational parameters may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs gap) - power drop
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 lbs
1890.0 g / 18.5 N
weak grip
1 mm 1144 Gs
114.4 mT
1.72 kg / 3.79 lbs
1717.6 g / 16.8 N
weak grip
2 mm 1060 Gs
106.0 mT
1.48 kg / 3.25 lbs
1475.6 g / 14.5 N
weak grip
3 mm 961 Gs
96.1 mT
1.21 kg / 2.67 lbs
1212.1 g / 11.9 N
weak grip
5 mm 754 Gs
75.4 mT
0.75 kg / 1.65 lbs
746.8 g / 7.3 N
weak grip
10 mm 376 Gs
37.6 mT
0.19 kg / 0.41 lbs
185.6 g / 1.8 N
weak grip
15 mm 193 Gs
19.3 mT
0.05 kg / 0.11 lbs
48.9 g / 0.5 N
weak grip
20 mm 107 Gs
10.7 mT
0.02 kg / 0.03 lbs
15.0 g / 0.1 N
weak grip
30 mm 41 Gs
4.1 mT
0.00 kg / 0.00 lbs
2.2 g / 0.0 N
weak grip
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
weak grip

Table 2: Sliding force (wall)
MPL 25x15x2 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.38 kg / 0.83 lbs
378.0 g / 3.7 N
1 mm Stal (~0.2) 0.34 kg / 0.76 lbs
344.0 g / 3.4 N
2 mm Stal (~0.2) 0.30 kg / 0.65 lbs
296.0 g / 2.9 N
3 mm Stal (~0.2) 0.24 kg / 0.53 lbs
242.0 g / 2.4 N
5 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
10 mm Stal (~0.2) 0.04 kg / 0.08 lbs
38.0 g / 0.4 N
15 mm Stal (~0.2) 0.01 kg / 0.02 lbs
10.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 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: Vertical assembly (shearing) - vertical pull
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 lbs
567.0 g / 5.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.38 kg / 0.83 lbs
378.0 g / 3.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.19 kg / 0.42 lbs
189.0 g / 1.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
0.95 kg / 2.08 lbs
945.0 g / 9.3 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 25x15x2 / N38

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

Table 5: Working in heat (stability) - power drop
MPL 25x15x2 / N38

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

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 25x15x2 / N38

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

Table 7: Hazards (electronics) - 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
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 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) - warning
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: Anti-corrosion coating 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: Electrical data (Pc)
MPL 25x15x2 / N38

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

Table 11: Submerged application
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Vertical hold

*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*For N38 material, 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
Pulling force

Magnetic Induction

Check out more products

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 25x15x2 mm and a weight of 5.63 g, guarantees premium class connection. This rectangular block with a force of 18.53 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.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 1.89 kg can pinch very hard and cause hematomas. 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 generators and material handling systems. 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. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
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.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. In practice, this means that this magnet has the greatest attraction force on its main planes (25x15 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 25x15x2 mm, which, at a weight of 5.63 g, makes it an element with high energy density. The key parameter here is the holding force amounting to approximately 1.89 kg (force ~18.53 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over approximately ten years – the reduction in power is only ~1% (theoretically),
  • Magnets effectively defend themselves against demagnetization caused by foreign field sources,
  • By using a lustrous layer of silver, the element acquires an aesthetic look,
  • Magnetic induction on the surface of the magnet remains strong,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
  • Possibility of custom creating and adjusting to defined applications,
  • Versatile presence in modern technologies – they are commonly used in HDD drives, electromotive mechanisms, medical equipment, as well as complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 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, in case of application outdoors
  • We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Best holding force of the magnet in ideal parameterswhat it depends on?

The specified lifting capacity concerns the maximum value, recorded under optimal environment, specifically:
  • using a sheet made of low-carbon steel, functioning as a magnetic yoke
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

Bear in mind that the application force may be lower influenced by the following factors, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
  • Smoothness – full contact is possible only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal factor – high temperature weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Metal Allergy

Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If you have an allergy, avoid direct skin contact and opt for encased magnets.

Mechanical processing

Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.

Thermal limits

Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.

Danger to the youngest

NdFeB magnets are not suitable for play. Swallowing several magnets can lead to them connecting inside the digestive tract, which constitutes a severe health hazard and necessitates immediate surgery.

Bodily injuries

Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two attracting surfaces.

Handling rules

Be careful. Rare earth magnets attract from a long distance and connect with huge force, often faster than you can move away.

Magnetic interference

Be aware: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, device, and GPS.

Electronic hazard

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).

Life threat

Warning for patients: Powerful magnets disrupt electronics. Keep at least 30 cm distance or ask another person to work with the magnets.

Magnet fragility

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

Danger! Learn more about hazards in the article: Magnet Safety Guide.