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MPL 25x10x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020387

GTIN/EAN: 5906301811862

5.00
Load capacity 4.14 kg / 40.56 N Magnetic Induction 230.69 mT / 2307 Gs
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
Coating
[NiCuNi] Nickel

How we measure these parameters — certificates and measurements

2.90net / pcs

3.57 zł with VAT (23% VAT) / pcs

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Quantity
Net
Gross
price from 1 pcs
2.90 zł
3.57 zł
price from 250 pcs
2.73 zł
3.35 zł
price from 900 pcs
2.55 zł
3.14 zł

Frequently asked questions

How much will a block magnet really hold?
The catalogue force is measured in full contact with smooth steel at least 10 mm thick, pulled perpendicular, at about 20 °C. On 1 mm sheet about 50% of that value remains, on 0.5 mm about 25%. Mounted on a vertical wall the realistic figure is 20–30%, because the load is then in shear rather than in tension.
What is the maximum working temperature?
Standard N-series grades up to 80 °C, and N50, N52 and N54 up to 60 °C. Above the maximum working temperature the loss stops being reversible. The Curie temperature, at which magnetic properties are lost completely, is about 310 °C.
What safety factor should I allow?
At least twice the mass of the item, and three to five times for vertical mounting. The margin covers sheet thickness, surface condition, any layer of paint or rust, and vibration.

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.

Want to talk magnets?

Call us now +48 888 99 98 98 alternatively let us know using contact form the contact section.
Specifications and structure of a neodymium magnet can be estimated using our power calculator.

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Technical of the product - 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 310 °C
Curie Temperature TF 590 °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 product - data

Presented information represent the result of a mathematical analysis. Results are based on models for the material Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs distance) - 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 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: Sliding force (wall)
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: Steel thickness (saturation) - power losses
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 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 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: Magnet-Magnet interaction (attraction) - field collision
MPL 25x10x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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: Safety (HSE) (implants) - precautionary measures
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
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 23.96 km/h
(6.66 m/s)
0.12 J
30 mm 24.40 km/h
(6.78 m/s)
0.13 J
50 mm 24.40 km/h
(6.78 m/s)
0.13 J
100 mm 24.41 km/h
(6.78 m/s)
0.13 J

Table 9: Anti-corrosion coating durability
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 (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: Physics of underwater searching
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

1. Shear force

*Warning: On a vertical surface, the magnet retains only ~20% of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely limits the holding force.

3. Power loss vs temp

*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) = 0.25

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.

Technical and environmental data

Material specification

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
Magnet Unit Converter

Force (pull)


Field Strength

Other proposals

Component MPL 25x10x3 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 40.56 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 25x10x3 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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 magnetic separators 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. 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).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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. It is a magnetic block with dimensions 25x10x3 mm and a self-weight of 5.63 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their notable holding force, neodymium magnets have these key benefits:
  • They retain full power for almost ten years – the drop is just ~1% (based on simulations),
  • They are extremely resistant to demagnetization induced by external field influence,
  • The use of an aesthetic finish of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is a key feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Considering the potential of flexible molding and customization to specialized requirements, NdFeB magnets can be created in a wide range of shapes and sizes, which expands the range of possible applications,
  • Fundamental importance in modern industrial fields – they serve a role in mass storage devices, electromotive mechanisms, medical equipment, also technologically advanced constructions.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons

Disadvantages of neodymium magnets:
  • At very strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
  • We suggest a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex forms.
  • Health risk to health – tiny shards of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these products are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Breakaway force was determined for the most favorable conditions, assuming:
  • using a plate made of mild steel, acting as a circuit closing element
  • whose transverse dimension equals approx. 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

What influences lifting capacity in practice

During everyday use, the actual lifting capacity is determined by several key aspects, ranked from crucial:
  • Distance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Element 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. Stainless steels may generate lower lifting capacity.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Machining danger

Dust produced during grinding of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Safe distance

Equipment safety: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, mechanical watches).

Handling guide

Be careful. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.

Physical harm

Big blocks can crush fingers instantly. Do not put your hand between two strong magnets.

Life threat

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Sensitization to coating

It is widely known that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose encased magnets.

Precision electronics

Be aware: rare earth magnets generate a field that interferes with precision electronics. Keep a safe distance from your mobile, device, and GPS.

Product not for children

NdFeB magnets are not suitable for play. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and necessitates immediate surgery.

Heat warning

Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about HT versions (H, SH, UH).

Risk of cracking

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.

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