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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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Technical details - 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

Engineering modeling of the assembly - data

These data represent the outcome of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a reference point when designing systems.

Table 1: Static force (pull vs gap) - power drop
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 load (vertical surface)
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 (shearing) - vertical pull
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: Magnet-Magnet interaction (attraction) - field range
MPL 45x25x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 (implants) - 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
Mechanical watch 20 Gs (2.0 mT) 10.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Car key 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: Dynamics (kinetic energy) - collision effects
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: Anti-corrosion coating durability
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: Electrical data (Pc)
MPL 45x25x10 / N38

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

Table 11: Underwater work (magnet fishing)
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%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

*Note: On a vertical surface, the magnet holds merely ~20% of its max power.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Temperature resistance

*For standard magnets, the critical limit 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
Chemical composition
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
Magnet Unit Converter
Magnet pull force

Field Strength

Other offers

This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 45x25x10 mm and a weight of 84.38 g, guarantees premium class connection. This rectangular block with a force of 279.40 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 45x25x10 / 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. Thanks to the flat surface and high force (approx. 28.48 kg), they are ideal as hidden locks 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. 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.
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 protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Advantages

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They retain attractive force for almost 10 years – the drop is just ~1% (according to analyses),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a smooth nickel surface has better aesthetics,
  • Magnetic induction on the working part of the magnet is very high,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of custom modeling and optimizing to atypical requirements,
  • Huge importance in future technologies – they are used in data components, electromotive mechanisms, medical devices, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets: tips and applications.
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
  • Due to limitations in creating nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
  • Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these devices are able to complicate diagnosis medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

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

The declared magnet strength refers to the maximum value, measured under ideal test conditions, meaning:
  • with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
  • with a cross-section minimum 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • for force applied at a right angle (in the magnet axis)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

Please note that the magnet holding may be lower depending on the following factors, in order of importance:
  • Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
  • Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Warning for heart patients

People with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.

Threat to navigation

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

Mechanical processing

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

Eye protection

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.

Maximum temperature

Keep cool. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).

Safe distance

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).

Handling guide

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Keep away from children

Only for adults. Tiny parts can be swallowed, causing serious injuries. Store out of reach of children and animals.

Skin irritation risks

It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose versions in plastic housing.

Crushing force

Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.

Security! Learn more about hazards in the article: Safety of working with magnets.