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MPL 25x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020137

GTIN/EAN: 5906301811435

5.00

length

25 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

46.88 g

Magnetization Direction

↑ axial

Load capacity

19.39 kg / 190.25 N

Magnetic Induction

361.04 mT / 3610 Gs

Coating

[NiCuNi] Nickel

see technical data »

20.29 ZŁ with VAT / pcs + price for transport

16.50 ZŁ net + 23% VAT / pcs

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Technical of the product - MPL 25x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020137
GTIN/EAN 5906301811435
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 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 46.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.39 kg / 190.25 N
Magnetic Induction ~ ? 361.04 mT / 3610 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x25x10 / 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 product - technical parameters

The following data represent the outcome of a physical calculation. Values rely on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Please consider these data as a supplementary guide for designers.

Table 1: Static force (pull vs distance) - power drop
MPL 25x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3610 Gs
361.0 mT
 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
 dangerous!
1 mm 3392 Gs
339.2 mT
 17.12 kg / 37.74 lbs
17117.7 g / 167.9 N
 dangerous!
2 mm 3156 Gs
315.6 mT
 14.82 kg / 32.68 lbs
14822.5 g / 145.4 N
 dangerous!
3 mm 2913 Gs
291.3 mT
 12.63 kg / 27.85 lbs
12631.8 g / 123.9 N
 dangerous!
5 mm 2436 Gs
243.6 mT
 8.83 kg / 19.46 lbs
8827.9 g / 86.6 N
 medium risk
10 mm 1464 Gs
146.4 mT
 3.19 kg / 7.04 lbs
3191.5 g / 31.3 N
 medium risk
15 mm 872 Gs
87.2 mT
 1.13 kg / 2.49 lbs
1131.5 g / 11.1 N
 safe
20 mm 538 Gs
53.8 mT
 0.43 kg / 0.95 lbs
430.4 g / 4.2 N
 safe
30 mm 234 Gs
23.4 mT
 0.08 kg / 0.18 lbs
81.8 g / 0.8 N
 safe
50 mm 68 Gs
6.8 mT
 0.01 kg / 0.02 lbs
6.9 g / 0.1 N
 safe
Magnetic force drops sharply with every subsequent millimeter of gap. Remember that even the smallest gap (e.g., dirt, varnish, veneer) significantly reduces the pull force. Neodymiums work optimally in perfect adhesion; air break drastically cuts the power. Notice how rapidly the parameters drop, when the product does not touch directly to the steel surface. When designing the assembly, avoid additional spacers.

Table 2: Vertical capacity (wall)
MPL 25x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
1 mm Stal (~0.2) 3.42 kg / 7.55 lbs
3424.0 g / 33.6 N
2 mm Stal (~0.2) 2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
3 mm Stal (~0.2) 2.53 kg / 5.57 lbs
2526.0 g / 24.8 N
5 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
10 mm Stal (~0.2) 0.64 kg / 1.41 lbs
638.0 g / 6.3 N
15 mm Stal (~0.2) 0.23 kg / 0.50 lbs
226.0 g / 2.2 N
20 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section defines the estimated force sufficient to cause the sliding of the magnet down against a vertical metal surface (considering typical friction coefficient). The holding force depends on the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 25x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.82 kg / 12.82 lbs
5817.0 g / 57.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.94 kg / 4.27 lbs
1939.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.70 kg / 21.37 lbs
9695.0 g / 95.1 N
When hanging a element on a upright plane (e.g., a fridge), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip mean that products slip faster than they detach. Want to create a vertical fastening? Consider that the sliding force is much weaker than the perpendicular breakaway force. On a painted metal, the holder will slide down under a noticeably lighter weight. Using a rubber coating can significantly increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MPL 25x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.97 kg / 2.14 lbs
969.5 g / 9.5 N
1 mm
13%
 2.42 kg / 5.34 lbs
2423.8 g / 23.8 N
2 mm
25%
 4.85 kg / 10.69 lbs
4847.5 g / 47.6 N
3 mm
38%
 7.27 kg / 16.03 lbs
7271.3 g / 71.3 N
5 mm
63%
 12.12 kg / 26.72 lbs
12118.8 g / 118.9 N
10 mm
100%
 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
11 mm
100%
 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
12 mm
100%
 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
A thin metal plate cannot take in the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a thin surface, the magnetism will penetrate right through and the pull force will drop sharply. To utilize the maximum of this magnet's power, you need a suitably thick element of steel. The material oversaturation means that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We recommend selecting the steel dimension from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 25x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
 OK
40 °C -2.2% 18.96 kg / 41.81 lbs
18963.4 g / 186.0 N
 OK
60 °C -4.4% 18.54 kg / 40.87 lbs
18536.8 g / 181.8 N
80 °C -6.6% 18.11 kg / 39.93 lbs
18110.3 g / 177.7 N
100 °C -28.8% 13.81 kg / 30.44 lbs
13805.7 g / 135.4 N
Ordinary NdFeB products lose parameters past the thermal threshold. Avoid high temperatures – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's power temporarily lowers. Refrain from using this magnet in hot environments higher than its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Engineering note: Heat tolerance is determined by both grade, as well as the dimension ratios. Low-profile magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table indicates permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 25x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.20 kg / 110.68 lbs
5 073 Gs
7.53 kg / 16.60 lbs
7531 g / 73.9 N
 N/A
1 mm 47.31 kg / 104.30 lbs
7 008 Gs
7.10 kg / 15.65 lbs
7097 g / 69.6 N
 42.58 kg / 93.87 lbs
~0 Gs
2 mm 44.32 kg / 97.71 lbs
6 783 Gs
6.65 kg / 14.66 lbs
6648 g / 65.2 N
 39.89 kg / 87.94 lbs
~0 Gs
3 mm 41.33 kg / 91.12 lbs
6 550 Gs
6.20 kg / 13.67 lbs
6200 g / 60.8 N
 37.20 kg / 82.01 lbs
~0 Gs
5 mm 35.49 kg / 78.25 lbs
6 070 Gs
5.32 kg / 11.74 lbs
5324 g / 52.2 N
 31.94 kg / 70.43 lbs
~0 Gs
10 mm 22.86 kg / 50.39 lbs
4 871 Gs
3.43 kg / 7.56 lbs
3429 g / 33.6 N
 20.57 kg / 45.35 lbs
~0 Gs
20 mm 8.26 kg / 18.22 lbs
2 929 Gs
1.24 kg / 2.73 lbs
1240 g / 12.2 N
 7.44 kg / 16.40 lbs
~0 Gs
50 mm 0.46 kg / 1.02 lbs
695 Gs
0.07 kg / 0.15 lbs
70 g / 0.7 N
 0.42 kg / 0.92 lbs
~0 Gs
60 mm 0.21 kg / 0.47 lbs
469 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
70 mm 0.10 kg / 0.23 lbs
329 Gs
0.02 kg / 0.03 lbs
16 g / 0.2 N
 0.09 kg / 0.21 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
239 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.11 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
178 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
136 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
Two magnetic products interact from a wider radius than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of action. Want to build a powerful holder? Utilize two neodymiums instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction between like poles is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
* Results refer to sliding force of a pair of matching magnets (friction ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MPL 25x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
Extremely neodym field poses a large risk to electronics and pacemakers. These NdFeB products produce a field that disrupts operation of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (cracking risk) - collision effects
MPL 25x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.52 km/h
(6.26 m/s)
 0.92 J
30 mm 35.62 km/h
(9.89 m/s)
 2.29 J
50 mm 45.87 km/h
(12.74 m/s)
 3.81 J
100 mm 64.86 km/h
(18.02 m/s)
 7.61 J
Magnetic elements are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Kinetic force can trigger coating fragments or injury to skin. Always hold the magnet during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 25x25x10 / 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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 25x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 497 Mx 235.0 µWb
Pc Coefficient 0.46 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data when building generators as well as sensors. The Pc coefficient defines the magnet's operating point.

Table 11: Submerged application
MPL 25x25x10 / N38

Environment Effective steel pull Effect
Air (land) 19.39 kg Standard
Water (riverbed) 22.20 kg
(+2.81 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!
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Caution: On a vertical wall, the magnet retains only ~20% of its nominal pull.

2. Efficiency vs thickness

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

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46

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
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: 020137-2026
Magnet Unit Converter
Pulling force
Field Strength
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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 25x25x10 mm and a weight of 46.88 g, guarantees the highest quality connection. This magnetic block with a force of 190.25 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 strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 25x25x10 / 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.
Plate magnets MPL 25x25x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 19.39 kg), they are ideal as closers 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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 25x25x10 / N38 model is magnetized axially (dimension 10 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 (25x25 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 25x25x10 mm, which, at a weight of 46.88 g, makes it an element with high energy density. It is a magnetic block with dimensions 25x25x10 mm and a self-weight of 46.88 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Advantages

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They have unchanged lifting capacity, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
  • They maintain their magnetic properties even under close interference source,
  • By using a smooth coating of gold, the element has an nice look,
  • The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • In view of the option of accurate shaping and adaptation to custom needs, neodymium magnets can be manufactured in a variety of geometric configurations, which expands the range of possible applications,
  • Key role in electronics industry – they are used in mass storage devices, electric motors, diagnostic systems, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in small systems

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating nuts in the magnet and complex shapes - preferred is cover - magnet mounting.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Highest magnetic holding force – what affects it?

The lifting capacity listed is a measurement result executed under the following configuration:
  • on a plate made of structural steel, effectively closing the magnetic field
  • with a thickness no less than 10 mm
  • characterized by even structure
  • with zero gap (without coatings)
  • under perpendicular application of breakaway force (90-degree angle)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

Holding efficiency impacted by specific conditions, including (from most important):
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate decreases the holding force.

Precautions when working with neodymium magnets
Beware of splinters

Neodymium magnets are ceramic materials, meaning they are very brittle. Impact of two magnets leads to them shattering into shards.

GPS and phone interference

GPS units and mobile phones are highly sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Skin irritation risks

Allergy Notice: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop handling magnets and use protective gear.

Fire risk

Dust generated during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Bone fractures

Danger of trauma: The pulling power is so great that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Immense force

Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Demagnetization risk

Keep cool. NdFeB magnets are susceptible to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Keep away from children

These products are not intended for children. Accidental ingestion of several magnets may result in them pinching intestinal walls, which constitutes a critical condition and necessitates immediate surgery.

Life threat

For implant holders: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or request help to handle the magnets.

Protect data

Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Important! Want to know more? Read our article: Are neodymium magnets dangerous?