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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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Physical properties - 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

Technical analysis of the product - report

Presented data are the result of a engineering analysis. Results are based on models for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
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 lbs
4140.0 g / 40.6 N
warning
1 mm 2050 Gs
205.0 mT
3.27 kg / 7.21 lbs
3272.4 g / 32.1 N
warning
2 mm 1752 Gs
175.2 mT
2.39 kg / 5.27 lbs
2388.9 g / 23.4 N
warning
3 mm 1463 Gs
146.3 mT
1.67 kg / 3.68 lbs
1667.1 g / 16.4 N
low risk
5 mm 1000 Gs
100.0 mT
0.78 kg / 1.72 lbs
779.2 g / 7.6 N
low risk
10 mm 416 Gs
41.6 mT
0.13 kg / 0.30 lbs
134.4 g / 1.3 N
low risk
15 mm 200 Gs
20.0 mT
0.03 kg / 0.07 lbs
31.0 g / 0.3 N
low risk
20 mm 108 Gs
10.8 mT
0.01 kg / 0.02 lbs
9.0 g / 0.1 N
low risk
30 mm 40 Gs
4.0 mT
0.00 kg / 0.00 lbs
1.3 g / 0.0 N
low risk
50 mm 10 Gs
1.0 mT
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
low risk

Table 2: Vertical 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 lbs
828.0 g / 8.1 N
1 mm Stal (~0.2) 0.65 kg / 1.44 lbs
654.0 g / 6.4 N
2 mm Stal (~0.2) 0.48 kg / 1.05 lbs
478.0 g / 4.7 N
3 mm Stal (~0.2) 0.33 kg / 0.74 lbs
334.0 g / 3.3 N
5 mm Stal (~0.2) 0.16 kg / 0.34 lbs
156.0 g / 1.5 N
10 mm Stal (~0.2) 0.03 kg / 0.06 lbs
26.0 g / 0.3 N
15 mm Stal (~0.2) 0.01 kg / 0.01 lbs
6.0 g / 0.1 N
20 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 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 (shearing) - 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 lbs
1242.0 g / 12.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
0.83 kg / 1.83 lbs
828.0 g / 8.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.41 kg / 0.91 lbs
414.0 g / 4.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
2.07 kg / 4.56 lbs
2070.0 g / 20.3 N

Table 4: Material efficiency (saturation) - 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 lbs
414.0 g / 4.1 N
1 mm
25%
1.04 kg / 2.28 lbs
1035.0 g / 10.2 N
2 mm
50%
2.07 kg / 4.56 lbs
2070.0 g / 20.3 N
3 mm
75%
3.10 kg / 6.85 lbs
3105.0 g / 30.5 N
5 mm
100%
4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
10 mm
100%
4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
11 mm
100%
4.14 kg / 9.13 lbs
4140.0 g / 40.6 N
12 mm
100%
4.14 kg / 9.13 lbs
4140.0 g / 40.6 N

Table 5: Thermal resistance (stability) - resistance threshold
MPL 25x10x3 / N38

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

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

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

Table 7: Protective zones (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
Mechanical watch 20 Gs (2.0 mT) 4.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.5 cm
Remote 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: Dynamics (kinetic energy) - 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: Surface protection spec
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: Construction data (Flux)
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. Sliding resistance

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

2. Steel saturation

*Thin metal sheet (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 material, the max working temp is 80°C.

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

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

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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
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%
Sustainability
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
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Pulling force

Magnetic Field

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Model MPL 25x10x3 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 4.14 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 sliding 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. To separate the MPL 25x10x3 / 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 25x10x3 / 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. 4.14 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 25x10x3 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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. 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 3 mm (thickness). The key parameter here is the lifting capacity 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 neodymium magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • They retain attractive force for nearly ten years – the drop is just ~1% (according to analyses),
  • Magnets effectively resist against demagnetization caused by foreign field sources,
  • By covering with a shiny coating of silver, the element has an nice look,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, 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 form) even at a temperature of 230°C or more...
  • Thanks to freedom in constructing and the capacity to customize to individual projects,
  • Huge importance in high-tech industry – they are used in HDD drives, motor assemblies, medical equipment, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

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.
  • We warn that neodymium magnets can reduce their power 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 during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complex forms - recommended is a housing - magnetic holder.
  • Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small elements of these devices are able to complicate diagnosis medical in case of swallowing.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Holding force characteristics

Detachment force of the magnet in optimal conditionswhat it depends on?

The declared magnet strength represents the maximum value, recorded under optimal environment, namely:
  • with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with an polished touching surface
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at temperature room level

Impact of factors on magnetic holding capacity in practice

In practice, the real power is determined by several key aspects, presented from most significant:
  • Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel gives the best results. Alloy steels decrease magnetic permeability and lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate reduces the load capacity.

Safety rules for work with NdFeB magnets
Bone fractures

Big blocks can crush fingers in a fraction of a second. Do not place your hand betwixt two strong magnets.

Electronic devices

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, timepieces).

Caution required

Be careful. Rare earth magnets act from a distance and connect with massive power, often quicker than you can react.

Dust explosion hazard

Fire warning: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.

No play value

Always store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are tragic.

Implant safety

For implant holders: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

GPS and phone interference

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.

Allergy Warning

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands and select coated magnets.

Operating temperature

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Protective goggles

Neodymium magnets are ceramic materials, which means they are very brittle. Collision of two magnets leads to them shattering into shards.

Security! Looking for details? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98