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MPL 45x25x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020164

GTIN/EAN: 5906301811701

5.00

length

45 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

84.38 g

Magnetization Direction

↑ axial

Load capacity

28.48 kg / 279.40 N

Magnetic Induction

306.29 mT / 3063 Gs

Coating

[NiCuNi] Nickel

35.01 with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 45x25x10 / N38 - lamellar magnet

Specification / characteristics - MPL 45x25x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020164
GTIN/EAN 5906301811701
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 45 mm [±0,1 mm]
Width 25 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 84.38 g
Magnetization Direction ↑ axial
Load capacity ~ ? 28.48 kg / 279.40 N
Magnetic Induction ~ ? 306.29 mT / 3063 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 45x25x10 / 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 product - report

The following values represent the direct effect of a mathematical simulation. Results were calculated on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs distance) - characteristics
MPL 45x25x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3062 Gs
306.2 mT
28.48 kg / 62.79 LBS
28480.0 g / 279.4 N
dangerous!
1 mm 2918 Gs
291.8 mT
25.86 kg / 57.00 LBS
25856.7 g / 253.7 N
dangerous!
2 mm 2760 Gs
276.0 mT
23.13 kg / 51.00 LBS
23133.2 g / 226.9 N
dangerous!
3 mm 2595 Gs
259.5 mT
20.45 kg / 45.08 LBS
20449.5 g / 200.6 N
dangerous!
5 mm 2261 Gs
226.1 mT
15.53 kg / 34.23 LBS
15525.8 g / 152.3 N
dangerous!
10 mm 1529 Gs
152.9 mT
7.10 kg / 15.64 LBS
7096.1 g / 69.6 N
warning
15 mm 1018 Gs
101.8 mT
3.15 kg / 6.94 LBS
3147.4 g / 30.9 N
warning
20 mm 688 Gs
68.8 mT
1.44 kg / 3.17 LBS
1439.4 g / 14.1 N
safe
30 mm 340 Gs
34.0 mT
0.35 kg / 0.77 LBS
350.8 g / 3.4 N
safe
50 mm 111 Gs
11.1 mT
0.04 kg / 0.08 LBS
37.1 g / 0.4 N
safe

Table 2: Shear capacity (wall)
MPL 45x25x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 5.70 kg / 12.56 LBS
5696.0 g / 55.9 N
1 mm Stal (~0.2) 5.17 kg / 11.40 LBS
5172.0 g / 50.7 N
2 mm Stal (~0.2) 4.63 kg / 10.20 LBS
4626.0 g / 45.4 N
3 mm Stal (~0.2) 4.09 kg / 9.02 LBS
4090.0 g / 40.1 N
5 mm Stal (~0.2) 3.11 kg / 6.85 LBS
3106.0 g / 30.5 N
10 mm Stal (~0.2) 1.42 kg / 3.13 LBS
1420.0 g / 13.9 N
15 mm Stal (~0.2) 0.63 kg / 1.39 LBS
630.0 g / 6.2 N
20 mm Stal (~0.2) 0.29 kg / 0.63 LBS
288.0 g / 2.8 N
30 mm Stal (~0.2) 0.07 kg / 0.15 LBS
70.0 g / 0.7 N
50 mm Stal (~0.2) 0.01 kg / 0.02 LBS
8.0 g / 0.1 N

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 45x25x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
8.54 kg / 18.84 LBS
8544.0 g / 83.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.70 kg / 12.56 LBS
5696.0 g / 55.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.85 kg / 6.28 LBS
2848.0 g / 27.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
14.24 kg / 31.39 LBS
14240.0 g / 139.7 N

Table 4: Steel thickness (substrate influence) - power losses
MPL 45x25x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
1.42 kg / 3.14 LBS
1424.0 g / 14.0 N
1 mm
13%
3.56 kg / 7.85 LBS
3560.0 g / 34.9 N
2 mm
25%
7.12 kg / 15.70 LBS
7120.0 g / 69.8 N
3 mm
38%
10.68 kg / 23.55 LBS
10680.0 g / 104.8 N
5 mm
63%
17.80 kg / 39.24 LBS
17800.0 g / 174.6 N
10 mm
100%
28.48 kg / 62.79 LBS
28480.0 g / 279.4 N
11 mm
100%
28.48 kg / 62.79 LBS
28480.0 g / 279.4 N
12 mm
100%
28.48 kg / 62.79 LBS
28480.0 g / 279.4 N

Table 5: Working in heat (material behavior) - power drop
MPL 45x25x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 28.48 kg / 62.79 LBS
28480.0 g / 279.4 N
OK
40 °C -2.2% 27.85 kg / 61.41 LBS
27853.4 g / 273.2 N
OK
60 °C -4.4% 27.23 kg / 60.02 LBS
27226.9 g / 267.1 N
80 °C -6.6% 26.60 kg / 58.64 LBS
26600.3 g / 260.9 N
100 °C -28.8% 20.28 kg / 44.70 LBS
20277.8 g / 198.9 N

Table 6: Two magnets (attraction) - field range
MPL 45x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 65.04 kg / 143.40 LBS
4 590 Gs
9.76 kg / 21.51 LBS
9757 g / 95.7 N
N/A
1 mm 62.12 kg / 136.95 LBS
5 985 Gs
9.32 kg / 20.54 LBS
9318 g / 91.4 N
55.91 kg / 123.25 LBS
~0 Gs
2 mm 59.05 kg / 130.19 LBS
5 836 Gs
8.86 kg / 19.53 LBS
8858 g / 86.9 N
53.15 kg / 117.17 LBS
~0 Gs
3 mm 55.95 kg / 123.34 LBS
5 680 Gs
8.39 kg / 18.50 LBS
8392 g / 82.3 N
50.35 kg / 111.01 LBS
~0 Gs
5 mm 49.74 kg / 109.66 LBS
5 356 Gs
7.46 kg / 16.45 LBS
7461 g / 73.2 N
44.77 kg / 98.70 LBS
~0 Gs
10 mm 35.46 kg / 78.17 LBS
4 522 Gs
5.32 kg / 11.73 LBS
5319 g / 52.2 N
31.91 kg / 70.36 LBS
~0 Gs
20 mm 16.21 kg / 35.73 LBS
3 057 Gs
2.43 kg / 5.36 LBS
2431 g / 23.8 N
14.59 kg / 32.16 LBS
~0 Gs
50 mm 1.58 kg / 3.48 LBS
955 Gs
0.24 kg / 0.52 LBS
237 g / 2.3 N
1.42 kg / 3.14 LBS
~0 Gs
60 mm 0.80 kg / 1.77 LBS
680 Gs
0.12 kg / 0.26 LBS
120 g / 1.2 N
0.72 kg / 1.59 LBS
~0 Gs
70 mm 0.43 kg / 0.94 LBS
497 Gs
0.06 kg / 0.14 LBS
64 g / 0.6 N
0.38 kg / 0.85 LBS
~0 Gs
80 mm 0.24 kg / 0.53 LBS
372 Gs
0.04 kg / 0.08 LBS
36 g / 0.4 N
0.22 kg / 0.47 LBS
~0 Gs
90 mm 0.14 kg / 0.31 LBS
284 Gs
0.02 kg / 0.05 LBS
21 g / 0.2 N
0.13 kg / 0.28 LBS
~0 Gs
100 mm 0.08 kg / 0.19 LBS
221 Gs
0.01 kg / 0.03 LBS
13 g / 0.1 N
0.08 kg / 0.17 LBS
~0 Gs

Table 7: Protective zones (electronics) - precautionary measures
MPL 45x25x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 16.0 cm
Hearing aid 10 Gs (1.0 mT) 12.5 cm
Timepiece 20 Gs (2.0 mT) 10.0 cm
Mobile device 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm

Table 8: Collisions (kinetic energy) - warning
MPL 45x25x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.22 km/h
(5.89 m/s)
1.47 J
30 mm 32.34 km/h
(8.98 m/s)
3.40 J
50 mm 41.46 km/h
(11.52 m/s)
5.60 J
100 mm 58.59 km/h
(16.28 m/s)
11.18 J

Table 9: Corrosion resistance
MPL 45x25x10 / 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 45x25x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 35 829 Mx 358.3 µWb
Pc Coefficient 0.36 Low (Flat)

Table 11: Submerged application
MPL 45x25x10 / N38

Environment Effective steel pull Effect
Air (land) 28.48 kg Standard
Water (riverbed) 32.61 kg
(+4.13 kg buoyancy gain)
+14.5%
Corrosion 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

*Note: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.

2. Steel saturation

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

3. Thermal stability

*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) = 0.36

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
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: 020164-2026
Measurement Calculator
Force (pull)

Field Strength

Other proposals

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 45x25x10 mm and a weight of 84.38 g, guarantees the highest quality connection. As a block magnet with high power (approx. 28.48 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. To separate the MPL 45x25x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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.
Plate magnets MPL 45x25x10 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 28.48 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.
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. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 45x25x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
The presented product is a neodymium magnet with precisely defined parameters: 45 mm (length), 25 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 45x25x10 mm and a self-weight of 84.38 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:
  • They do not lose strength, even during around 10 years – the decrease in strength is only ~1% (according to tests),
  • They are resistant to demagnetization induced by external magnetic fields,
  • A magnet with a smooth gold surface has an effective appearance,
  • Neodymium magnets ensure maximum magnetic induction on a small surface, which allows for strong attraction,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
  • Possibility of exact shaping and modifying to precise requirements,
  • Fundamental importance in modern technologies – they serve a role in magnetic memories, brushless drives, precision medical tools, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using a housing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small components of these devices are able to disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Holding force characteristics

Maximum holding power of the magnet – what affects it?

The declared magnet strength represents the maximum value, recorded under ideal test conditions, meaning:
  • using a base made of mild steel, serving as a magnetic yoke
  • whose transverse dimension reaches at least 10 mm
  • characterized by even structure
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at conditions approx. 20°C

Lifting capacity in real conditions – factors

Bear in mind that the application force will differ subject to the following factors, in order of importance:
  • Distance (betwixt the magnet and the metal), because even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Material composition – not every steel attracts identically. High carbon content worsen the attraction effect.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the lifting capacity.

Precautions when working with neodymium magnets
Nickel allergy

Studies show that nickel (standard magnet coating) is a common allergen. If you have an allergy, avoid touching magnets with bare hands or select coated magnets.

Magnetic media

Device Safety: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Impact on smartphones

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

ICD Warning

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Physical harm

Mind your fingers. Two powerful magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Keep away from children

These products are not toys. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a critical condition and necessitates urgent medical intervention.

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Dust is flammable

Mechanical processing of neodymium magnets poses a fire risk. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Immense force

Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and respect their force.

Fragile material

Neodymium magnets are ceramic materials, which means they are very brittle. Impact of two magnets leads to them cracking into shards.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?