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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

product parameters »

4.66 ZŁ with VAT / pcs + price for transport

3.79 ZŁ net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical of the product - 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

Physical simulation of the magnet - data

These values represent the direct effect of a engineering simulation. Values rely on models for the material Nd2Fe14B. Actual conditions may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
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
 warning
1 mm 2932 Gs
293.2 mT
 5.67 kg / 12.51 LBS
5673.2 g / 55.7 N
 warning
2 mm 2479 Gs
247.9 mT
 4.06 kg / 8.94 LBS
4056.9 g / 39.8 N
 warning
3 mm 2065 Gs
206.5 mT
 2.81 kg / 6.21 LBS
2814.7 g / 27.6 N
 warning
5 mm 1419 Gs
141.9 mT
 1.33 kg / 2.93 LBS
1328.6 g / 13.0 N
 low risk
10 mm 603 Gs
60.3 mT
 0.24 kg / 0.53 LBS
240.3 g / 2.4 N
 low risk
15 mm 296 Gs
29.6 mT
 0.06 kg / 0.13 LBS
57.8 g / 0.6 N
 low risk
20 mm 162 Gs
16.2 mT
 0.02 kg / 0.04 LBS
17.4 g / 0.2 N
 low risk
30 mm 62 Gs
6.2 mT
 0.00 kg / 0.01 LBS
2.5 g / 0.0 N
 low risk
50 mm 16 Gs
1.6 mT
 0.00 kg / 0.00 LBS
0.2 g / 0.0 N
 low risk
Grip strength decreases significantly with every mm of spacing. Remember that even a microscopic distance (e.g., dirt, paint, veneer) noticeably diminishes the holding power. Neodymiums hold most effectively in perfect adhesion; air break weakens the force. See how quickly the pull force plummet, when the magnet does not touch tightly to the steel surface. When designing the assembly, avoid redundant distances.

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
The following data shows the approximate shear load required to start the downward movement of the magnet downwards against a vertical metal surface (considering typical friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - 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
When hanging a holder on a vertical surface (e.g., a board), it you can count on only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that magnets slip faster than they detach. Want to create a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a significantly smaller cargo. Utilizing a rubberized coating can drastically improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
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
A too thin steel cannot take in the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To achieve 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the product holds weaker. We advise picking the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - 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
Classic neodymiums irreversibly lose power after exceeding the maximum temperature. Protect against heat – heat can irreversibly destroy this magnet. With increasing heat, the neodymium's capacity momentarily decreases. Avoid using this magnet close to heaters exceeding its working range. Ignoring the limit will cause destruction of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress compared to rod magnets. The danger warning in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 25x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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
Two strong neodymiums attract each other from a wider radius than a magnet and steel setup. The connection of magnet-to-magnet generates a stronger field and a further horizon of performance. Planning to create a powerful holder? Apply two magnets instead of one magnet and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the connection force, but still significant.
*Flux density between like poles is approximately ~0 Gs at the geometric center between the magnets (due to field cancellation).
Important: Results refer to friction force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - 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
A strong magnetic field poses a real danger to electronics and pacemakers. These magnets produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with cochlear implants and insulin pumps. Influence will be felt by: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - 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
NdFeB products are delicate – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating durability
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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Electrical data (Pc)
MPL 25x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 245 Mx 82.5 µWb
Pc Coefficient 0.38 Low (Flat)
Flux value emitted by the pole surface. Key data for generator designers as well as sensors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
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!
The magnetic field penetrates through water without any losses. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

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

2. Plate thickness effect

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

3. Power loss vs temp

*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) = 0.38

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.

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: 020135-2026
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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 25x10x5 mm and a weight of 9.38 g, guarantees the highest quality connection. As a block magnet with high power (approx. 7.49 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.
The key to success is shifting 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. 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 closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 25x10x5 / 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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 25x10x5 / N38 model is magnetized through the thickness (dimension 5 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.
This model is characterized by dimensions 25x10x5 mm, which, at a weight of 9.38 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 7.49 kg (force ~73.45 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of neodymium magnets.

Strengths

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They retain attractive force for nearly 10 years – the loss is just ~1% (according to analyses),
  • Neodymium magnets are remarkably resistant to loss of magnetic properties caused by external field sources,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Fundamental importance in innovative solutions – they are used in data components, drive modules, medical devices, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complex shapes in magnets, we propose using casing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum lifting capacity of the magnet – what contributes to it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a plate made of structural steel, optimally conducting the magnetic field
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • with a plane perfectly flat
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature room level

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding will differ subject to elements below, in order of importance:
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Plate material – low-carbon steel gives the best results. Alloy admixtures decrease magnetic permeability and holding force.
  • Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Fire warning

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

Cards and drives

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can destroy these devices and erase data from cards.

Shattering risk

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Powerful field

Use magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their force.

Thermal limits

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will destroy its properties and strength.

Warning for heart patients

Health Alert: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.

Metal Allergy

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness happens, cease working with magnets and use protective gear.

GPS and phone interference

An intense magnetic field interferes with the functioning of magnetometers in smartphones and navigation systems. Do not bring magnets close to a device to avoid damaging the sensors.

Crushing risk

Large magnets can crush fingers instantly. Never put your hand between two strong magnets.

Choking Hazard

Only for adults. Tiny parts can be swallowed, causing severe trauma. Store away from kids and pets.

Safety First! Need more info? Check our post: Are neodymium magnets dangerous?