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MPL 25x10x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020387

GTIN/EAN: 5906301811862

5.00

length

25 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

5.63 g

Magnetization Direction

↑ axial

Load capacity

4.14 kg / 40.56 N

Magnetic Induction

230.69 mT / 2307 Gs

Coating

[NiCuNi] Nickel

3.57 with VAT / pcs + price for transport

2.90 ZŁ net + 23% VAT / pcs

bulk discounts:

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Give us a call +48 888 99 98 98 otherwise get in touch via our online form through our site.
Lifting power along with shape of a magnet can be tested using our online calculation tool.

Orders placed before 14:00 will be shipped the same business day.

Technical data - MPL 25x10x3 / N38 - lamellar magnet

Specification / characteristics - MPL 25x10x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020387
GTIN/EAN 5906301811862
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 3 mm [±0,1 mm]
Weight 5.63 g
Magnetization Direction ↑ axial
Load capacity ~ ? 4.14 kg / 40.56 N
Magnetic Induction ~ ? 230.69 mT / 2307 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x10x3 / 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 analysis of the assembly - data

Presented information constitute the result of a physical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 25x10x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2306 Gs
230.6 mT
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
strong
1 mm 2050 Gs
205.0 mT
3.27 kg / 7.21 pounds
3272.4 g / 32.1 N
strong
2 mm 1752 Gs
175.2 mT
2.39 kg / 5.27 pounds
2388.9 g / 23.4 N
strong
3 mm 1463 Gs
146.3 mT
1.67 kg / 3.68 pounds
1667.1 g / 16.4 N
safe
5 mm 1000 Gs
100.0 mT
0.78 kg / 1.72 pounds
779.2 g / 7.6 N
safe
10 mm 416 Gs
41.6 mT
0.13 kg / 0.30 pounds
134.4 g / 1.3 N
safe
15 mm 200 Gs
20.0 mT
0.03 kg / 0.07 pounds
31.0 g / 0.3 N
safe
20 mm 108 Gs
10.8 mT
0.01 kg / 0.02 pounds
9.0 g / 0.1 N
safe
30 mm 40 Gs
4.0 mT
0.00 kg / 0.00 pounds
1.3 g / 0.0 N
safe
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
safe

Table 2: Slippage force (vertical surface)
MPL 25x10x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 0.83 kg / 1.83 pounds
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.65 kg / 1.44 pounds
654.0 g / 6.4 N
2 mm Stal (~0.2) 0.48 kg / 1.05 pounds
478.0 g / 4.7 N
3 mm Stal (~0.2) 0.33 kg / 0.74 pounds
334.0 g / 3.3 N
5 mm Stal (~0.2) 0.16 kg / 0.34 pounds
156.0 g / 1.5 N
10 mm Stal (~0.2) 0.03 kg / 0.06 pounds
26.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 25x10x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
1.24 kg / 2.74 pounds
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 25x10x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
1 mm
25%
1.04 kg / 2.28 pounds
1035.0 g / 10.2 N
2 mm
50%
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
3 mm
75%
3.10 kg / 6.85 pounds
3105.0 g / 30.5 N
5 mm
100%
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
10 mm
100%
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
11 mm
100%
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
12 mm
100%
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N

Table 5: Thermal stability (stability) - thermal limit
MPL 25x10x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
OK
40 °C -2.2% 4.05 kg / 8.93 pounds
4048.9 g / 39.7 N
OK
60 °C -4.4% 3.96 kg / 8.73 pounds
3957.8 g / 38.8 N
80 °C -6.6% 3.87 kg / 8.52 pounds
3866.8 g / 37.9 N
100 °C -28.8% 2.95 kg / 6.50 pounds
2947.7 g / 28.9 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 25x10x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 8.20 kg / 18.07 pounds
3 767 Gs
1.23 kg / 2.71 pounds
1230 g / 12.1 N
N/A
1 mm 7.38 kg / 16.27 pounds
4 377 Gs
1.11 kg / 2.44 pounds
1107 g / 10.9 N
6.64 kg / 14.65 pounds
~0 Gs
2 mm 6.48 kg / 14.28 pounds
4 101 Gs
0.97 kg / 2.14 pounds
972 g / 9.5 N
5.83 kg / 12.86 pounds
~0 Gs
3 mm 5.58 kg / 12.30 pounds
3 805 Gs
0.84 kg / 1.84 pounds
837 g / 8.2 N
5.02 kg / 11.07 pounds
~0 Gs
5 mm 3.97 kg / 8.74 pounds
3 208 Gs
0.59 kg / 1.31 pounds
595 g / 5.8 N
3.57 kg / 7.87 pounds
~0 Gs
10 mm 1.54 kg / 3.40 pounds
2 001 Gs
0.23 kg / 0.51 pounds
231 g / 2.3 N
1.39 kg / 3.06 pounds
~0 Gs
20 mm 0.27 kg / 0.59 pounds
831 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
0.24 kg / 0.53 pounds
~0 Gs
50 mm 0.01 kg / 0.01 pounds
127 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
60 mm 0.00 kg / 0.01 pounds
80 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
70 mm 0.00 kg / 0.00 pounds
54 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.00 pounds
38 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
27 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
20 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
0.00 kg / 0.00 pounds
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 25x10x3 / 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
Timepiece 20 Gs (2.0 mT) 4.0 cm
Mobile device 40 Gs (4.0 mT) 3.5 cm
Car key 50 Gs (5.0 mT) 3.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm

Table 8: Impact energy (cracking risk) - collision effects
MPL 25x10x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 27.90 km/h
(7.75 m/s)
0.17 J
30 mm 47.38 km/h
(13.16 m/s)
0.49 J
50 mm 61.15 km/h
(16.99 m/s)
0.81 J
100 mm 86.48 km/h
(24.02 m/s)
1.62 J

Table 9: Corrosion resistance
MPL 25x10x3 / 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 25x10x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 928 Mx 59.3 µWb
Pc Coefficient 0.25 Low (Flat)

Table 11: Submerged application
MPL 25x10x3 / N38

Environment Effective steel pull Effect
Air (land) 4.14 kg Standard
Water (riverbed) 4.74 kg
(+0.60 kg buoyancy gain)
+14.5%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Wall mount (shear)

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

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.

3. Power loss vs temp

*For standard magnets, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.25

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
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: 020387-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other deals

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 25x10x3 mm and a weight of 5.63 g, guarantees premium class connection. This magnetic block with a force of 40.56 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. Watch your fingers! Magnets with a force of 4.14 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 25x10x3 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as invisible mounts under tiles, wood, or glass. 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. 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 25x10x3 / N38 model is magnetized through the thickness (dimension 3 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 (25x10 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 25x10x3 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 4.14 kg (force ~40.56 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of rare earth magnets.

Advantages

Besides their durability, neodymium magnets are valued for these benefits:
  • They do not lose magnetism, even over nearly ten years – the decrease in strength is only ~1% (based on measurements),
  • Magnets very well resist against loss of magnetization caused by ambient magnetic noise,
  • By using a lustrous coating of silver, the element presents an elegant look,
  • They show high magnetic induction at the operating surface, which improves attraction properties,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of precise forming and adjusting to defined needs,
  • Fundamental importance in high-tech industry – they serve a role in mass storage devices, brushless drives, medical equipment, also multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and proposals for their use:
  • Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
  • Limited possibility of creating threads in the magnet and complex forms - preferred is cover - magnet mounting.
  • Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Holding force characteristics

Highest magnetic holding forcewhat contributes to it?

The lifting capacity listed is a theoretical maximum value executed under specific, ideal conditions:
  • using a base made of low-carbon steel, functioning as a ideal flux conductor
  • with a thickness of at least 10 mm
  • with a plane perfectly flat
  • without the slightest air gap between the magnet and steel
  • during detachment in a direction vertical to the mounting surface
  • at ambient temperature room level

Magnet lifting force in use – key factors

Bear in mind that the working load may be lower influenced by the following factors, in order of importance:
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Immense force

Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.

Bone fractures

Danger of trauma: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Implant safety

Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.

Machining danger

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Swallowing risk

Always store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.

Beware of splinters

Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Do not overheat magnets

Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.

Threat to electronics

Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.

GPS Danger

GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Avoid contact if allergic

Certain individuals have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to dermatitis. We suggest wear safety gloves.

Important! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98