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MPL 25x10x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020135

GTIN/EAN: 5906301811411

5.00

length

25 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

9.38 g

Magnetization Direction

↑ axial

Load capacity

7.49 kg / 73.45 N

Magnetic Induction

337.05 mT / 3371 Gs

Coating

[NiCuNi] Nickel

4.66 with VAT / pcs + price for transport

3.79 ZŁ net + 23% VAT / pcs

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Technical - MPL 25x10x5 / N38 - lamellar magnet

Specification / characteristics - MPL 25x10x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020135
GTIN/EAN 5906301811411
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 10 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 9.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.49 kg / 73.45 N
Magnetic Induction ~ ? 337.05 mT / 3371 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x10x5 / 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 - report

The following data constitute the direct effect of a physical analysis. Values rely on algorithms for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs distance) - power drop
MPL 25x10x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3369 Gs
336.9 mT
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
strong
1 mm 2932 Gs
293.2 mT
5.67 kg / 12.51 LBS
5673.2 g / 55.7 N
strong
2 mm 2479 Gs
247.9 mT
4.06 kg / 8.94 LBS
4056.9 g / 39.8 N
strong
3 mm 2065 Gs
206.5 mT
2.81 kg / 6.21 LBS
2814.7 g / 27.6 N
strong
5 mm 1419 Gs
141.9 mT
1.33 kg / 2.93 LBS
1328.6 g / 13.0 N
safe
10 mm 603 Gs
60.3 mT
0.24 kg / 0.53 LBS
240.3 g / 2.4 N
safe
15 mm 296 Gs
29.6 mT
0.06 kg / 0.13 LBS
57.8 g / 0.6 N
safe
20 mm 162 Gs
16.2 mT
0.02 kg / 0.04 LBS
17.4 g / 0.2 N
safe
30 mm 62 Gs
6.2 mT
0.00 kg / 0.01 LBS
2.5 g / 0.0 N
safe
50 mm 16 Gs
1.6 mT
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
safe

Table 2: Shear load (wall)
MPL 25x10x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.50 kg / 3.30 LBS
1498.0 g / 14.7 N
1 mm Stal (~0.2) 1.13 kg / 2.50 LBS
1134.0 g / 11.1 N
2 mm Stal (~0.2) 0.81 kg / 1.79 LBS
812.0 g / 8.0 N
3 mm Stal (~0.2) 0.56 kg / 1.24 LBS
562.0 g / 5.5 N
5 mm Stal (~0.2) 0.27 kg / 0.59 LBS
266.0 g / 2.6 N
10 mm Stal (~0.2) 0.05 kg / 0.11 LBS
48.0 g / 0.5 N
15 mm Stal (~0.2) 0.01 kg / 0.03 LBS
12.0 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 (sliding) - behavior on slippery surfaces
MPL 25x10x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.25 kg / 4.95 LBS
2247.0 g / 22.0 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.50 kg / 3.30 LBS
1498.0 g / 14.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.75 kg / 1.65 LBS
749.0 g / 7.3 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.75 kg / 8.26 LBS
3745.0 g / 36.7 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 25x10x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.75 kg / 1.65 LBS
749.0 g / 7.3 N
1 mm
25%
1.87 kg / 4.13 LBS
1872.5 g / 18.4 N
2 mm
50%
3.75 kg / 8.26 LBS
3745.0 g / 36.7 N
3 mm
75%
5.62 kg / 12.38 LBS
5617.5 g / 55.1 N
5 mm
100%
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
10 mm
100%
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
11 mm
100%
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
12 mm
100%
7.49 kg / 16.51 LBS
7490.0 g / 73.5 N

Table 5: Thermal resistance (stability) - thermal limit
MPL 25x10x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.49 kg / 16.51 LBS
7490.0 g / 73.5 N
OK
40 °C -2.2% 7.33 kg / 16.15 LBS
7325.2 g / 71.9 N
OK
60 °C -4.4% 7.16 kg / 15.79 LBS
7160.4 g / 70.2 N
80 °C -6.6% 7.00 kg / 15.42 LBS
6995.7 g / 68.6 N
100 °C -28.8% 5.33 kg / 11.76 LBS
5332.9 g / 52.3 N

Table 6: Two magnets (attraction) - field range
MPL 25x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.49 kg / 38.57 LBS
4 785 Gs
2.62 kg / 5.78 LBS
2624 g / 25.7 N
N/A
1 mm 15.37 kg / 33.89 LBS
6 316 Gs
2.31 kg / 5.08 LBS
2306 g / 22.6 N
13.84 kg / 30.50 LBS
~0 Gs
2 mm 13.25 kg / 29.21 LBS
5 864 Gs
1.99 kg / 4.38 LBS
1987 g / 19.5 N
11.92 kg / 26.29 LBS
~0 Gs
3 mm 11.26 kg / 24.83 LBS
5 407 Gs
1.69 kg / 3.72 LBS
1690 g / 16.6 N
10.14 kg / 22.35 LBS
~0 Gs
5 mm 7.91 kg / 17.44 LBS
4 531 Gs
1.19 kg / 2.62 LBS
1187 g / 11.6 N
7.12 kg / 15.70 LBS
~0 Gs
10 mm 3.10 kg / 6.84 LBS
2 838 Gs
0.47 kg / 1.03 LBS
465 g / 4.6 N
2.79 kg / 6.16 LBS
~0 Gs
20 mm 0.56 kg / 1.24 LBS
1 207 Gs
0.08 kg / 0.19 LBS
84 g / 0.8 N
0.51 kg / 1.11 LBS
~0 Gs
50 mm 0.01 kg / 0.03 LBS
194 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.03 LBS
~0 Gs
60 mm 0.01 kg / 0.01 LBS
124 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 / 0.01 LBS
84 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
59 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
43 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
32 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 25x10x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.0 cm
Hearing aid 10 Gs (1.0 mT) 6.0 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Car key 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (cracking risk) - warning
MPL 25x10x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 29.06 km/h
(8.07 m/s)
0.31 J
30 mm 49.37 km/h
(13.71 m/s)
0.88 J
50 mm 63.73 km/h
(17.70 m/s)
1.47 J
100 mm 90.12 km/h
(25.03 m/s)
2.94 J

Table 9: Corrosion resistance
MPL 25x10x5 / 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 (Flux)
MPL 25x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 245 Mx 82.5 µWb
Pc Coefficient 0.38 Low (Flat)

Table 11: Submerged application
MPL 25x10x5 / N38

Environment Effective steel pull Effect
Air (land) 7.49 kg Standard
Water (riverbed) 8.58 kg
(+1.09 kg buoyancy gain)
+14.5%
Warning: 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

*Note: On a vertical wall, the magnet holds just a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Power loss vs temp

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38

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.

Engineering data and GPSR
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%
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: 020135-2026
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Magnet pull force

Magnetic Field

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 25x10x5 mm and a weight of 9.38 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 7.49 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.
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 7.49 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 wind generators and material handling systems. Thanks to the flat surface and high force (approx. 7.49 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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 (25x10 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: 25 mm (length), 10 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 25x10x5 mm and a self-weight of 9.38 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 Nd2Fe14B magnets.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They retain attractive force for around ten years – the loss is just ~1% (based on simulations),
  • They maintain their magnetic properties even under close interference source,
  • In other words, due to the aesthetic surface of silver, the element is aesthetically pleasing,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to the option of precise shaping and adaptation to custom solutions, magnetic components can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
  • Key role in advanced technology sectors – they are commonly used in hard drives, brushless drives, medical equipment, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 resistant to moisture, when using outdoors
  • We recommend a housing - magnetic mount, due to difficulties in producing threads inside the magnet and complex shapes.
  • 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 tiny parts of these products can be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price exceeds standard values,

Pull force analysis

Highest magnetic holding forcewhat it depends on?

Information about lifting capacity was determined for optimal configuration, taking into account:
  • using a base made of low-carbon steel, functioning as a magnetic yoke
  • with a cross-section minimum 10 mm
  • with an polished touching surface
  • with direct contact (without coatings)
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by working environment parameters, mainly (from most important):
  • Gap between magnet and steel – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds much less (often approx. 20-30% of maximum force).
  • Plate thickness – too thin plate does not close the flux, causing part of the flux to be wasted to the other side.
  • Material composition – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Plate texture – ground elements guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Moreover, even a slight gap between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Keep away from children

Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Crushing force

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

Compass and GPS

An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Keep magnets near a device to avoid damaging the sensors.

Allergic reactions

It is widely known that the nickel plating (the usual finish) is a common allergen. If you have an allergy, prevent direct skin contact or opt for coated magnets.

Safe operation

Be careful. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.

Thermal limits

Do not overheat. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

Combustion hazard

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

Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.

Material brittleness

Beware of splinters. Magnets can explode upon violent connection, ejecting sharp fragments into the air. Wear goggles.

Medical interference

People with a heart stimulator have to maintain an large gap from magnets. The magnetism can interfere with the operation of the life-saving device.

Safety First! 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