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MPL 25x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020137

GTIN/EAN: 5906301811435

5.00

length

25 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

46.88 g

Magnetization Direction

↑ axial

Load capacity

19.39 kg / 190.25 N

Magnetic Induction

361.04 mT / 3610 Gs

Coating

[NiCuNi] Nickel

20.29 with VAT / pcs + price for transport

16.50 ZŁ net + 23% VAT / pcs

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Product card - MPL 25x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020137
GTIN/EAN 5906301811435
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 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 46.88 g
Magnetization Direction ↑ axial
Load capacity ~ ? 19.39 kg / 190.25 N
Magnetic Induction ~ ? 361.04 mT / 3610 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 25x25x10 / 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 simulation of the assembly - technical parameters

These data constitute the direct effect of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Operational conditions may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.

Table 1: Static force (force vs gap) - power drop
MPL 25x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3610 Gs
361.0 mT
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
critical level
1 mm 3392 Gs
339.2 mT
17.12 kg / 37.74 lbs
17117.7 g / 167.9 N
critical level
2 mm 3156 Gs
315.6 mT
14.82 kg / 32.68 lbs
14822.5 g / 145.4 N
critical level
3 mm 2913 Gs
291.3 mT
12.63 kg / 27.85 lbs
12631.8 g / 123.9 N
critical level
5 mm 2436 Gs
243.6 mT
8.83 kg / 19.46 lbs
8827.9 g / 86.6 N
medium risk
10 mm 1464 Gs
146.4 mT
3.19 kg / 7.04 lbs
3191.5 g / 31.3 N
medium risk
15 mm 872 Gs
87.2 mT
1.13 kg / 2.49 lbs
1131.5 g / 11.1 N
low risk
20 mm 538 Gs
53.8 mT
0.43 kg / 0.95 lbs
430.4 g / 4.2 N
low risk
30 mm 234 Gs
23.4 mT
0.08 kg / 0.18 lbs
81.8 g / 0.8 N
low risk
50 mm 68 Gs
6.8 mT
0.01 kg / 0.02 lbs
6.9 g / 0.1 N
low risk

Table 2: Shear force (wall)
MPL 25x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
1 mm Stal (~0.2) 3.42 kg / 7.55 lbs
3424.0 g / 33.6 N
2 mm Stal (~0.2) 2.96 kg / 6.53 lbs
2964.0 g / 29.1 N
3 mm Stal (~0.2) 2.53 kg / 5.57 lbs
2526.0 g / 24.8 N
5 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
10 mm Stal (~0.2) 0.64 kg / 1.41 lbs
638.0 g / 6.3 N
15 mm Stal (~0.2) 0.23 kg / 0.50 lbs
226.0 g / 2.2 N
20 mm Stal (~0.2) 0.09 kg / 0.19 lbs
86.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
16.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Vertical assembly (shearing) - vertical pull
MPL 25x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.82 kg / 12.82 lbs
5817.0 g / 57.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.88 kg / 8.55 lbs
3878.0 g / 38.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.94 kg / 4.27 lbs
1939.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.70 kg / 21.37 lbs
9695.0 g / 95.1 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 25x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.97 kg / 2.14 lbs
969.5 g / 9.5 N
1 mm
13%
2.42 kg / 5.34 lbs
2423.8 g / 23.8 N
2 mm
25%
4.85 kg / 10.69 lbs
4847.5 g / 47.6 N
3 mm
38%
7.27 kg / 16.03 lbs
7271.3 g / 71.3 N
5 mm
63%
12.12 kg / 26.72 lbs
12118.8 g / 118.9 N
10 mm
100%
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
11 mm
100%
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
12 mm
100%
19.39 kg / 42.75 lbs
19390.0 g / 190.2 N

Table 5: Working in heat (stability) - resistance threshold
MPL 25x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 19.39 kg / 42.75 lbs
19390.0 g / 190.2 N
OK
40 °C -2.2% 18.96 kg / 41.81 lbs
18963.4 g / 186.0 N
OK
60 °C -4.4% 18.54 kg / 40.87 lbs
18536.8 g / 181.8 N
80 °C -6.6% 18.11 kg / 39.93 lbs
18110.3 g / 177.7 N
100 °C -28.8% 13.81 kg / 30.44 lbs
13805.7 g / 135.4 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 25x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 50.20 kg / 110.68 lbs
5 073 Gs
7.53 kg / 16.60 lbs
7531 g / 73.9 N
N/A
1 mm 47.31 kg / 104.30 lbs
7 008 Gs
7.10 kg / 15.65 lbs
7097 g / 69.6 N
42.58 kg / 93.87 lbs
~0 Gs
2 mm 44.32 kg / 97.71 lbs
6 783 Gs
6.65 kg / 14.66 lbs
6648 g / 65.2 N
39.89 kg / 87.94 lbs
~0 Gs
3 mm 41.33 kg / 91.12 lbs
6 550 Gs
6.20 kg / 13.67 lbs
6200 g / 60.8 N
37.20 kg / 82.01 lbs
~0 Gs
5 mm 35.49 kg / 78.25 lbs
6 070 Gs
5.32 kg / 11.74 lbs
5324 g / 52.2 N
31.94 kg / 70.43 lbs
~0 Gs
10 mm 22.86 kg / 50.39 lbs
4 871 Gs
3.43 kg / 7.56 lbs
3429 g / 33.6 N
20.57 kg / 45.35 lbs
~0 Gs
20 mm 8.26 kg / 18.22 lbs
2 929 Gs
1.24 kg / 2.73 lbs
1240 g / 12.2 N
7.44 kg / 16.40 lbs
~0 Gs
50 mm 0.46 kg / 1.02 lbs
695 Gs
0.07 kg / 0.15 lbs
70 g / 0.7 N
0.42 kg / 0.92 lbs
~0 Gs
60 mm 0.21 kg / 0.47 lbs
469 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
0.19 kg / 0.42 lbs
~0 Gs
70 mm 0.10 kg / 0.23 lbs
329 Gs
0.02 kg / 0.03 lbs
16 g / 0.2 N
0.09 kg / 0.21 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
239 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.11 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
178 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
136 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs

Table 7: Hazards (electronics) - warnings
MPL 25x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm

Table 8: Dynamics (kinetic energy) - collision effects
MPL 25x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.52 km/h
(6.26 m/s)
0.92 J
30 mm 35.62 km/h
(9.89 m/s)
2.29 J
50 mm 45.87 km/h
(12.74 m/s)
3.81 J
100 mm 64.86 km/h
(18.02 m/s)
7.61 J

Table 9: Anti-corrosion coating durability
MPL 25x25x10 / 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 25x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 23 497 Mx 235.0 µWb
Pc Coefficient 0.46 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 25x25x10 / N38

Environment Effective steel pull Effect
Air (land) 19.39 kg Standard
Water (riverbed) 22.20 kg
(+2.81 kg buoyancy gain)
+14.5%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Shear force

*Warning: On a vertical surface, the magnet holds merely approx. 20-30% of its max power.

2. Steel thickness impact

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

3. Thermal stability

*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) = 0.46

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
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%
Ecology and recycling (GPSR)
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: 020137-2026
Measurement Calculator
Force (pull)

Magnetic Field

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Model MPL 25x25x10 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 19.39 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.
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 19.39 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 19.39 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x25x10 / N38, it is best to use strong epoxy glues (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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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 (25x25 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), 25 mm (width), and 10 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 19.39 kg (force ~190.25 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Strengths

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • Their power is durable, and after around ten years it drops only by ~1% (according to research),
  • Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by magnetic disturbances,
  • A magnet with a smooth silver surface has better aesthetics,
  • They show high magnetic induction at the operating surface, which increases their power,
  • 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 the potential of precise molding and customization to custom needs, neodymium magnets can be produced in a wide range of geometric configurations, which makes them more universal,
  • Versatile presence in innovative solutions – they find application in computer drives, motor assemblies, medical devices, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We suggest cover - magnetic holder, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Pull force analysis

Maximum lifting force for a neodymium magnet – what it depends on?

The specified lifting capacity refers to the maximum value, measured under optimal environment, namely:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • whose thickness reaches at least 10 mm
  • with a plane cleaned and smooth
  • without any air gap between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at ambient temperature approx. 20 degrees Celsius

Determinants of lifting force in real conditions

In practice, the actual holding force depends on many variables, presented from the most important:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Material type – ideal substrate is pure iron steel. Stainless steels may attract less.
  • Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity was assessed with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets
Powerful field

Handle magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and do not underestimate their force.

Do not overheat magnets

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

Nickel allergy

Certain individuals experience a sensitization to nickel, which is the common plating for neodymium magnets. Extended handling may cause a rash. It is best to use protective gloves.

Phone sensors

Be aware: rare earth magnets generate a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

Swallowing risk

NdFeB magnets are not toys. Accidental ingestion of multiple magnets can lead to them attracting across intestines, which poses a critical condition and necessitates immediate surgery.

Hand protection

Big blocks can break fingers instantly. Do not place your hand betwixt two attracting surfaces.

Dust explosion hazard

Drilling and cutting of NdFeB material carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Material brittleness

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Collision of two magnets will cause them cracking into small pieces.

Medical interference

Patients with a ICD have to keep an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Electronic devices

Avoid bringing magnets near a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Caution! Want to know more? Check our post: Are neodymium magnets dangerous?