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MPL 25x12.5x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020136

GTIN/EAN: 5906301811428

5.00
Load capacity 7.72 kg / 75.74 N Magnetic Induction 299.70 mT / 2997 Gs
length
25 mm [±0,1 mm]
Width
12.5 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.72 g
Magnetization Direction
↑ axial
Coating
[NiCuNi] Nickel

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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 25x12.5x5 / N38 - lamellar magnet

Specification / characteristics - MPL 25x12.5x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020136
GTIN/EAN 5906301811428
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 12.5 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 11.72 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.72 kg / 75.74 N
Magnetic Induction ~ ? 299.70 mT / 2997 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x12.5x5 / 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 magnet - data

Presented values constitute the result of a mathematical simulation. Results were calculated on models for the material Nd2Fe14B. Operational performance may differ. Please consider these data as a supplementary guide when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 25x12.5x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2996 Gs
299.6 mT
7.72 kg / 17.02 LBS
7720.0 g / 75.7 N
strong
1 mm 2705 Gs
270.5 mT
6.29 kg / 13.87 LBS
6292.6 g / 61.7 N
strong
2 mm 2384 Gs
238.4 mT
4.89 kg / 10.77 LBS
4886.6 g / 47.9 N
strong
3 mm 2067 Gs
206.7 mT
3.67 kg / 8.10 LBS
3674.4 g / 36.0 N
strong
5 mm 1517 Gs
151.7 mT
1.98 kg / 4.36 LBS
1979.6 g / 19.4 N
weak grip
10 mm 702 Gs
70.2 mT
0.42 kg / 0.93 LBS
424.1 g / 4.2 N
weak grip
15 mm 355 Gs
35.5 mT
0.11 kg / 0.24 LBS
108.6 g / 1.1 N
weak grip
20 mm 198 Gs
19.8 mT
0.03 kg / 0.07 LBS
33.6 g / 0.3 N
weak grip
30 mm 76 Gs
7.6 mT
0.01 kg / 0.01 LBS
5.0 g / 0.0 N
weak grip
50 mm 20 Gs
2.0 mT
0.00 kg / 0.00 LBS
0.3 g / 0.0 N
weak grip

Table 2: Sliding hold (vertical surface)
MPL 25x12.5x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.54 kg / 3.40 LBS
1544.0 g / 15.1 N
1 mm Stal (~0.2) 1.26 kg / 2.77 LBS
1258.0 g / 12.3 N
2 mm Stal (~0.2) 0.98 kg / 2.16 LBS
978.0 g / 9.6 N
3 mm Stal (~0.2) 0.73 kg / 1.62 LBS
734.0 g / 7.2 N
5 mm Stal (~0.2) 0.40 kg / 0.87 LBS
396.0 g / 3.9 N
10 mm Stal (~0.2) 0.08 kg / 0.19 LBS
84.0 g / 0.8 N
15 mm Stal (~0.2) 0.02 kg / 0.05 LBS
22.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 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) - vertical pull
MPL 25x12.5x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.32 kg / 5.11 LBS
2316.0 g / 22.7 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.54 kg / 3.40 LBS
1544.0 g / 15.1 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.77 kg / 1.70 LBS
772.0 g / 7.6 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.86 kg / 8.51 LBS
3860.0 g / 37.9 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 25x12.5x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
0.77 kg / 1.70 LBS
772.0 g / 7.6 N
1 mm
25%
1.93 kg / 4.25 LBS
1930.0 g / 18.9 N
2 mm
50%
3.86 kg / 8.51 LBS
3860.0 g / 37.9 N
3 mm
75%
5.79 kg / 12.76 LBS
5790.0 g / 56.8 N
5 mm
100%
7.72 kg / 17.02 LBS
7720.0 g / 75.7 N
10 mm
100%
7.72 kg / 17.02 LBS
7720.0 g / 75.7 N
11 mm
100%
7.72 kg / 17.02 LBS
7720.0 g / 75.7 N
12 mm
100%
7.72 kg / 17.02 LBS
7720.0 g / 75.7 N

Table 5: Thermal stability (stability) - power drop
MPL 25x12.5x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.72 kg / 17.02 LBS
7720.0 g / 75.7 N
OK
40 °C -2.2% 7.55 kg / 16.65 LBS
7550.2 g / 74.1 N
OK
60 °C -4.4% 7.38 kg / 16.27 LBS
7380.3 g / 72.4 N
80 °C -6.6% 7.21 kg / 15.90 LBS
7210.5 g / 70.7 N
100 °C -28.8% 5.50 kg / 12.12 LBS
5496.6 g / 53.9 N

Table 6: Two magnets (repulsion) - field collision
MPL 25x12.5x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 17.29 kg / 38.13 LBS
4 511 Gs
2.59 kg / 5.72 LBS
2594 g / 25.4 N
N/A
1 mm 15.73 kg / 34.68 LBS
5 715 Gs
2.36 kg / 5.20 LBS
2360 g / 23.2 N
14.16 kg / 31.22 LBS
~0 Gs
2 mm 14.10 kg / 31.08 LBS
5 410 Gs
2.11 kg / 4.66 LBS
2114 g / 20.7 N
12.69 kg / 27.97 LBS
~0 Gs
3 mm 12.48 kg / 27.52 LBS
5 091 Gs
1.87 kg / 4.13 LBS
1872 g / 18.4 N
11.23 kg / 24.77 LBS
~0 Gs
5 mm 9.52 kg / 20.99 LBS
4 446 Gs
1.43 kg / 3.15 LBS
1428 g / 14.0 N
8.57 kg / 18.89 LBS
~0 Gs
10 mm 4.43 kg / 9.78 LBS
3 034 Gs
0.67 kg / 1.47 LBS
665 g / 6.5 N
3.99 kg / 8.80 LBS
~0 Gs
20 mm 0.95 kg / 2.09 LBS
1 404 Gs
0.14 kg / 0.31 LBS
142 g / 1.4 N
0.85 kg / 1.88 LBS
~0 Gs
50 mm 0.03 kg / 0.06 LBS
238 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
0.02 kg / 0.05 LBS
~0 Gs
60 mm 0.01 kg / 0.02 LBS
153 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
0.01 kg / 0.02 LBS
~0 Gs
70 mm 0.01 kg / 0.01 LBS
103 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.01 LBS
73 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
53 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
40 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
0.00 kg / 0.00 LBS
~0 Gs

Table 7: Hazards (implants) - warnings
MPL 25x12.5x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Mechanical watch 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 4.0 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Impact energy (kinetic energy) - warning
MPL 25x12.5x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.38 km/h
(6.77 m/s)
0.27 J
30 mm 25.08 km/h
(6.97 m/s)
0.28 J
50 mm 25.08 km/h
(6.97 m/s)
0.28 J
100 mm 25.09 km/h
(6.97 m/s)
0.28 J

Table 9: Anti-corrosion coating durability
MPL 25x12.5x5 / 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 25x12.5x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 639 Mx 96.4 µWb
Pc Coefficient 0.35 Low (Flat)

Table 11: Physics of underwater searching
MPL 25x12.5x5 / N38

Environment Effective steel pull Effect
Air (land) 7.72 kg Standard
Water (riverbed) 8.84 kg
(+1.12 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. Vertical hold

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

2. Steel thickness impact

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

3. Heat tolerance

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.35

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%

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: 020136-2026
Measurement Calculator

Magnet pull force


Magnetic Field

Other offers

This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 25x12.5x5 mm and a weight of 11.72 g, guarantees premium class connection. As a magnetic bar with high power (approx. 7.72 kg), this product is available immediately from our warehouse in Poland. 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. Watch your fingers! Magnets with a force of 7.72 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. They work great as fasteners under tiles, wood, or glass. 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 25x12.5x5 / N38, we recommend utilizing strong epoxy glues (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 (25x12.5 mm), which is ideal for flat mounting. 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), 12.5 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 7.72 kg (force ~75.74 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after around ten years it decreases only by ~1% (according to research),
  • They maintain their magnetic properties even under external field action,
  • In other words, due to the shiny finish of nickel, the element gains visual value,
  • Magnets are characterized by maximum magnetic induction on the outer side,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Thanks to flexibility in constructing and the ability to customize to specific needs,
  • Significant place in high-tech industry – they are commonly used in computer drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which allows their use in compact constructions

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
  • Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. It is also worth noting that small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Due to neodymium price, their price is higher than average,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension reaches at least 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial force direction (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Real force impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets
Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Compass and GPS

A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Maintain magnets close to a device to avoid breaking the sensors.

Safe distance

Intense magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Pinching danger

Protect your hands. Two powerful magnets will join instantly with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Product not for children

These products are not toys. Eating a few magnets may result in them attracting across intestines, which poses a direct threat to life and requires urgent medical intervention.

Maximum temperature

Avoid heat. NdFeB magnets are sensitive to temperature. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Handling guide

Handle magnets consciously. Their immense force can surprise even professionals. Stay alert and do not underestimate their power.

Health Danger

Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Shattering risk

Beware of splinters. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.

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