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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

bulk discounts:

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Technical specification of the product - 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 modeling of the product - report

Presented data are the result of a physical simulation. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull 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
crushing
1 mm 3392 Gs
339.2 mT
17.12 kg / 37.74 LBS
17117.7 g / 167.9 N
crushing
2 mm 3156 Gs
315.6 mT
14.82 kg / 32.68 LBS
14822.5 g / 145.4 N
crushing
3 mm 2913 Gs
291.3 mT
12.63 kg / 27.85 LBS
12631.8 g / 123.9 N
crushing
5 mm 2436 Gs
243.6 mT
8.83 kg / 19.46 LBS
8827.9 g / 86.6 N
warning
10 mm 1464 Gs
146.4 mT
3.19 kg / 7.04 LBS
3191.5 g / 31.3 N
warning
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: Slippage hold (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 (sliding) - behavior on slippery surfaces
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: Material efficiency (substrate influence) - 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) - power drop
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) Lateral Force (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
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Car key 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: Coating parameters (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: 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%
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

*Note: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Temperature resistance

*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%
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
Quick Unit Converter
Magnet pull force

Magnetic Induction

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 off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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 25x25x10 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 25x25x10 mm, which, at a weight of 46.88 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 19.39 kg (force ~190.25 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
  • They possess excellent resistance to weakening of magnetic properties due to external fields,
  • A magnet with a metallic silver surface is more attractive,
  • Magnets are characterized by excellent magnetic induction on the outer side,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of accurate forming as well as modifying to precise applications,
  • Significant place in advanced technology sectors – they serve a role in HDD drives, motor assemblies, diagnostic systems, and technologically advanced constructions.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:
  • They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 stable to moisture, when using outdoors
  • We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum magnetic pulling forcewhat it depends on?

Breakaway force was determined for optimal configuration, assuming:
  • with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at ambient temperature room level

Key elements affecting lifting force

Please note that the magnet holding may be lower influenced by elements below, in order of importance:
  • Distance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and holding force.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
  • Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Adults only

Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.

Medical implants

For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

GPS and phone interference

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Eye protection

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Bodily injuries

Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Immense force

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

Dust explosion hazard

Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Magnetic media

Data protection: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Maximum temperature

Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

Nickel coating and allergies

Studies show that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or select coated magnets.

Danger! Learn more about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98