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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

Physical simulation of the magnet - data

Presented information constitute the direct effect of a engineering calculation. Results rely on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these data as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - interaction chart
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 pounds
19390.0 g / 190.2 N
critical level
1 mm 3392 Gs
339.2 mT
17.12 kg / 37.74 pounds
17117.7 g / 167.9 N
critical level
2 mm 3156 Gs
315.6 mT
14.82 kg / 32.68 pounds
14822.5 g / 145.4 N
critical level
3 mm 2913 Gs
291.3 mT
12.63 kg / 27.85 pounds
12631.8 g / 123.9 N
critical level
5 mm 2436 Gs
243.6 mT
8.83 kg / 19.46 pounds
8827.9 g / 86.6 N
strong
10 mm 1464 Gs
146.4 mT
3.19 kg / 7.04 pounds
3191.5 g / 31.3 N
strong
15 mm 872 Gs
87.2 mT
1.13 kg / 2.49 pounds
1131.5 g / 11.1 N
low risk
20 mm 538 Gs
53.8 mT
0.43 kg / 0.95 pounds
430.4 g / 4.2 N
low risk
30 mm 234 Gs
23.4 mT
0.08 kg / 0.18 pounds
81.8 g / 0.8 N
low risk
50 mm 68 Gs
6.8 mT
0.01 kg / 0.02 pounds
6.9 g / 0.1 N
low risk

Table 2: Vertical load (vertical surface)
MPL 25x25x10 / N38

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

Table 3: Vertical assembly (sliding) - 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 pounds
5817.0 g / 57.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.88 kg / 8.55 pounds
3878.0 g / 38.0 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.94 kg / 4.27 pounds
1939.0 g / 19.0 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
9.70 kg / 21.37 pounds
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 pounds
969.5 g / 9.5 N
1 mm
13%
2.42 kg / 5.34 pounds
2423.8 g / 23.8 N
2 mm
25%
4.85 kg / 10.69 pounds
4847.5 g / 47.6 N
3 mm
38%
7.27 kg / 16.03 pounds
7271.3 g / 71.3 N
5 mm
63%
12.12 kg / 26.72 pounds
12118.8 g / 118.9 N
10 mm
100%
19.39 kg / 42.75 pounds
19390.0 g / 190.2 N
11 mm
100%
19.39 kg / 42.75 pounds
19390.0 g / 190.2 N
12 mm
100%
19.39 kg / 42.75 pounds
19390.0 g / 190.2 N

Table 5: Thermal stability (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 pounds
19390.0 g / 190.2 N
OK
40 °C -2.2% 18.96 kg / 41.81 pounds
18963.4 g / 186.0 N
OK
60 °C -4.4% 18.54 kg / 40.87 pounds
18536.8 g / 181.8 N
80 °C -6.6% 18.11 kg / 39.93 pounds
18110.3 g / 177.7 N
100 °C -28.8% 13.81 kg / 30.44 pounds
13805.7 g / 135.4 N

Table 6: Two magnets (repulsion) - forces in the system
MPL 25x25x10 / N38

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

Table 7: Protective zones (implants) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 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: Collisions (cracking risk) - warning
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: Construction data (Flux)
MPL 25x25x10 / N38

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

Table 11: Submerged application
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%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Note: On a vertical surface, the magnet retains merely a fraction of its max power.

2. Plate thickness effect

*Thin steel (e.g. computer case) drastically reduces the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46

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.

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%
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: 020137-2026
Measurement Calculator
Pulling force

Magnetic Field

Other offers

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 25x25x10 mm and a weight of 46.88 g, guarantees premium class connection. 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.
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. Watch your fingers! Magnets with a force of 19.39 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 25x25x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 25x25x10 / N38, we recommend utilizing 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. Remember to roughen and wash 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. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 25 mm (length), 25 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 25x25x10 mm and a self-weight of 46.88 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Advantages

Apart from their consistent magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even over nearly ten years – the reduction in strength is only ~1% (based on measurements),
  • They do not lose their magnetic properties even under strong external field,
  • By applying a smooth layer of nickel, the element gains an aesthetic look,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in constructing and the capacity to customize to client solutions,
  • Key role in advanced technology sectors – they are commonly used in computer drives, motor assemblies, medical equipment, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Cons

Problematic aspects of neodymium magnets and ways of using them
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is casing - mounting mechanism.
  • Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, small components of these products can disrupt the diagnostic process medical after entering the body.
  • Due to neodymium price, their price is relatively high,

Pull force analysis

Breakaway strength of the magnet in ideal conditionswhat it depends on?

The specified lifting capacity refers to the maximum value, recorded under laboratory conditions, namely:
  • using a sheet made of high-permeability steel, functioning as a circuit closing element
  • whose thickness reaches at least 10 mm
  • with a surface perfectly flat
  • without any air gap between the magnet and steel
  • during detachment in a direction perpendicular to the mounting surface
  • at room temperature

Lifting capacity in practice – influencing factors

Bear in mind that the working load will differ influenced by elements below, in order of importance:
  • Clearance – the presence of any layer (rust, dirt, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Base massiveness – too thin steel does not close the flux, causing part of the flux to be escaped to the other side.
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
  • Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – high temperature weakens pulling force. Too high temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Warnings
Health Danger

For implant holders: Strong magnetic fields disrupt electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Mechanical processing

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Shattering risk

NdFeB magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets leads to them breaking into small pieces.

Maximum temperature

Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. This process is irreversible.

Caution required

Use magnets with awareness. Their immense force can shock even experienced users. Stay alert and do not underestimate their force.

Product not for children

Only for adults. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.

Metal Allergy

Studies show that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact and choose coated magnets.

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Data carriers

Equipment safety: Neodymium magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Hand protection

Large magnets can smash fingers in a fraction of a second. Do not put your hand betwixt two strong magnets.

Warning! Want to know more? Read our article: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98