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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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Product card - 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 magnet - technical parameters

The following data represent the outcome of a mathematical simulation. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
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 pounds
28480.0 g / 279.4 N
crushing
1 mm 2918 Gs
291.8 mT
25.86 kg / 57.00 pounds
25856.7 g / 253.7 N
crushing
2 mm 2760 Gs
276.0 mT
23.13 kg / 51.00 pounds
23133.2 g / 226.9 N
crushing
3 mm 2595 Gs
259.5 mT
20.45 kg / 45.08 pounds
20449.5 g / 200.6 N
crushing
5 mm 2261 Gs
226.1 mT
15.53 kg / 34.23 pounds
15525.8 g / 152.3 N
crushing
10 mm 1529 Gs
152.9 mT
7.10 kg / 15.64 pounds
7096.1 g / 69.6 N
medium risk
15 mm 1018 Gs
101.8 mT
3.15 kg / 6.94 pounds
3147.4 g / 30.9 N
medium risk
20 mm 688 Gs
68.8 mT
1.44 kg / 3.17 pounds
1439.4 g / 14.1 N
low risk
30 mm 340 Gs
34.0 mT
0.35 kg / 0.77 pounds
350.8 g / 3.4 N
low risk
50 mm 111 Gs
11.1 mT
0.04 kg / 0.08 pounds
37.1 g / 0.4 N
low risk

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

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

Table 3: Wall mounting (sliding) - 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 pounds
8544.0 g / 83.8 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
5.70 kg / 12.56 pounds
5696.0 g / 55.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.85 kg / 6.28 pounds
2848.0 g / 27.9 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
14.24 kg / 31.39 pounds
14240.0 g / 139.7 N

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 45x25x10 / N38

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

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

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

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
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 pounds
4 590 Gs
9.76 kg / 21.51 pounds
9757 g / 95.7 N
N/A
1 mm 62.12 kg / 136.95 pounds
5 985 Gs
9.32 kg / 20.54 pounds
9318 g / 91.4 N
55.91 kg / 123.25 pounds
~0 Gs
2 mm 59.05 kg / 130.19 pounds
5 836 Gs
8.86 kg / 19.53 pounds
8858 g / 86.9 N
53.15 kg / 117.17 pounds
~0 Gs
3 mm 55.95 kg / 123.34 pounds
5 680 Gs
8.39 kg / 18.50 pounds
8392 g / 82.3 N
50.35 kg / 111.01 pounds
~0 Gs
5 mm 49.74 kg / 109.66 pounds
5 356 Gs
7.46 kg / 16.45 pounds
7461 g / 73.2 N
44.77 kg / 98.70 pounds
~0 Gs
10 mm 35.46 kg / 78.17 pounds
4 522 Gs
5.32 kg / 11.73 pounds
5319 g / 52.2 N
31.91 kg / 70.36 pounds
~0 Gs
20 mm 16.21 kg / 35.73 pounds
3 057 Gs
2.43 kg / 5.36 pounds
2431 g / 23.8 N
14.59 kg / 32.16 pounds
~0 Gs
50 mm 1.58 kg / 3.48 pounds
955 Gs
0.24 kg / 0.52 pounds
237 g / 2.3 N
1.42 kg / 3.14 pounds
~0 Gs
60 mm 0.80 kg / 1.77 pounds
680 Gs
0.12 kg / 0.26 pounds
120 g / 1.2 N
0.72 kg / 1.59 pounds
~0 Gs
70 mm 0.43 kg / 0.94 pounds
497 Gs
0.06 kg / 0.14 pounds
64 g / 0.6 N
0.38 kg / 0.85 pounds
~0 Gs
80 mm 0.24 kg / 0.53 pounds
372 Gs
0.04 kg / 0.08 pounds
36 g / 0.4 N
0.22 kg / 0.47 pounds
~0 Gs
90 mm 0.14 kg / 0.31 pounds
284 Gs
0.02 kg / 0.05 pounds
21 g / 0.2 N
0.13 kg / 0.28 pounds
~0 Gs
100 mm 0.08 kg / 0.19 pounds
221 Gs
0.01 kg / 0.03 pounds
13 g / 0.1 N
0.08 kg / 0.17 pounds
~0 Gs

Table 7: Hazards (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
Timepiece 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: Impact energy (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: Coating parameters (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: 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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Sliding resistance

*Warning: On a vertical surface, the magnet retains only ~20% of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

*For N38 grade, 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
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%
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: 020164-2026
Quick Unit Converter
Magnet pull force

Magnetic Induction

Other proposals

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. As a block magnet with high power (approx. 28.48 kg), this product is available off-the-shelf 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 shifting 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.
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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 45x25x10 mm, which, at a weight of 84.38 g, makes it an element with impressive energy density. 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.

Strengths and weaknesses of rare earth magnets.

Benefits

Besides their high retention, neodymium magnets are valued for these benefits:
  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • Magnets effectively resist against demagnetization caused by foreign field sources,
  • By using a reflective coating of silver, the element gains an nice look,
  • The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Possibility of individual shaping as well as adjusting to defined applications,
  • Huge importance in modern technologies – they are used in HDD drives, electric motors, medical devices, as well as multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength 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 during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complex shapes - recommended is a housing - magnetic holder.
  • Health risk related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding forcewhat affects it?

The lifting capacity listed is a result of laboratory testing performed under the following configuration:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth touching surface
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Holding efficiency is influenced by working environment parameters, including (from priority):
  • Gap (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Steel grade – ideal substrate is pure iron steel. Stainless steels may have worse magnetic properties.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
  • Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.

H&S for magnets
Powerful field

Handle magnets consciously. Their powerful strength can surprise even experienced users. Be vigilant and respect their force.

Magnet fragility

Neodymium magnets are sintered ceramics, meaning they are fragile like glass. Collision of two magnets leads to them breaking into small pieces.

Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or ask another person to work with the magnets.

Maximum temperature

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Safe distance

Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and erase data from cards.

No play value

Adult use only. Small elements pose a choking risk, causing severe trauma. Keep away from kids and pets.

Physical harm

Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!

Fire risk

Drilling and cutting of NdFeB material carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Threat to navigation

GPS units and smartphones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Allergic reactions

Studies show that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands and select coated magnets.

Important! Need more info? Read our article: Why are neodymium magnets dangerous?