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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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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

Engineering modeling of the product - report

These values represent the outcome of a engineering calculation. Results rely on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Use these calculations as a preliminary roadmap during assembly planning.

Table 1: Static pull force (pull vs gap) - interaction chart
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
 medium risk
1 mm 2932 Gs
293.2 mT
 5.67 kg / 12.51 lbs
5673.2 g / 55.7 N
 medium risk
2 mm 2479 Gs
247.9 mT
 4.06 kg / 8.94 lbs
4056.9 g / 39.8 N
 medium risk
3 mm 2065 Gs
206.5 mT
 2.81 kg / 6.21 lbs
2814.7 g / 27.6 N
 medium risk
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
Grip strength decreases sharply with every subsequent millimeter of gap. Remember that every additional insulation layer (e.g., dirt, paint, dust) significantly weakens the grip. Magnets hold optimally at the point of direct contact; air break weakens the force. Notice how quickly the load capacity fall, when the product does not adhere tightly to the steel surface. When calculating the mounting, avoid unnecessary gaps.

Table 2: Shear hold (vertical surface)
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
This section defines the approximate weight limit needed to start the shifting of the magnet downwards on a upright steel wall (assuming standard friction). The holding force is relative to the separation distance between the magnet and the metal.

Table 3: Wall mounting (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
When placing a element on a vertical plane (e.g., a fridge), it will only hold just about 20%-30% of its nominal power. Gravitational force as well as a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Want to create a hanger? Note that the sliding force is significantly lower than the maximum static pull force. On a slippery surface, the element will slide down under a much lighter weight. Using a rubber layer can drastically raise the stability.

Table 4: Steel thickness (saturation) - 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
A too thin steel is incapable of absorb the full magnetic flux, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To squeeze the maximum of this neodymium's power, you require a sufficiently solid element of metal. The material oversaturation means that on thin elements (e.g., appliance housings), the product shows lower pull force. We suggest choosing the steel cross-section based on the following data.

Table 5: Working in heat (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
Standard neodymium magnets lose parameters above the temperature limit. Watch out for overheating – excessive heat can permanently damage this magnet. As the temperature rises, the neodymium's capacity momentarily lowers. Do not use this product in hot environments higher than its operating temperature limit. Exceeding the critical threshold will cause permanent loss of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Flat magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Red status in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 25x10x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (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 magnets attract each other from a wider radius than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a larger range of operation. Designing a solid fastener? Utilize two neodymiums instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is huge. The repulsion force is marginally weaker than the attraction, but still large.
*Field value between like poles drops to ~0 Gs at the geometric center of the gap (due to field cancellation).
* Estimates refer to friction force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Phone / Smartphone 40 Gs (4.0 mT) 4.0 cm
Remote 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 large risk to IT equipment and pacemakers. These magnets produce a flux that disrupts operation of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and housings. Increased vigilance must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Impact energy (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
Magnetic elements are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or dangerous crushing to fingers. Hold the magnet firmly during installation so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
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 following table defines the conditions under which this product can be safely used. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 25x10x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 8 245 Mx 82.5 µWb
Pc Coefficient 0.38 Low (Flat)
Flux value passing through the pole surface. Key data for generator designers and motors. The Pc coefficient defines the working geometry.

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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Contrary to myths, water does not block the magnetic field. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Heat tolerance

*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.

Technical specification and ecology
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%
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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This product is a very powerful 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 premium class connection. This magnetic block with a force of 73.45 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 25x10x5 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 25x10x5 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x10x5 / N38, it is best to use 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 25x10x5 / N38 model is magnetized axially (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. 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 product meets the standards for N38 grade magnets.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

Besides their tremendous strength, neodymium magnets offer the following advantages:
  • They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
  • Neodymium magnets prove to be extremely resistant to demagnetization caused by external magnetic fields,
  • A magnet with a smooth nickel surface has an effective appearance,
  • Magnets exhibit huge magnetic induction on the active area,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
  • Considering the potential of free molding and customization to custom needs, NdFeB magnets can be modeled in a wide range of geometric configurations, which increases their versatility,
  • Key role in innovative solutions – they are utilized in computer drives, electromotive mechanisms, precision medical tools, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • 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
  • We suggest casing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Highest magnetic holding force – what contributes to it?

The specified lifting capacity represents the limit force, obtained under optimal environment, meaning:
  • using a plate made of high-permeability steel, acting as a ideal flux conductor
  • with a cross-section no less than 10 mm
  • characterized by smoothness
  • with direct contact (no paint)
  • during detachment in a direction perpendicular to the plane
  • at standard ambient temperature

Lifting capacity in practice – influencing factors

Effective lifting capacity is affected by specific conditions, such as (from most important):
  • Distance (between the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Steel thickness – too thin sheet does not accept the full field, causing part of the flux to be escaped into the air.
  • Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a small distance between the magnet’s surface and the plate decreases the holding force.

Safe handling of neodymium magnets
Immense force

Exercise caution. Rare earth magnets attract from a distance and connect with massive power, often quicker than you can move away.

Magnetic media

Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Stay away of min. 10 cm.

GPS Danger

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

Pinching danger

Pinching hazard: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.

Do not give to children

Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep away from children and animals.

Fire risk

Fire hazard: Rare earth powder is highly flammable. Do not process magnets in home conditions as this risks ignition.

Eye protection

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

Implant safety

Warning for patients: Powerful magnets affect electronics. Keep at least 30 cm distance or request help to work with the magnets.

Allergic reactions

Some people suffer from a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact can result in skin redness. We suggest use protective gloves.

Demagnetization risk

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

Important! Details about risks in the article: Safety of working with magnets.