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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

bulk discounts:

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Parameters and structure of a neodymium magnet can be reviewed with our magnetic calculator.

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Technical data - 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 product - data

These information represent the result of a engineering simulation. Results are based on models for the class Nd2Fe14B. Actual conditions may differ. Please consider these data as a reference point when designing systems.

Table 1: Static pull force (pull vs gap) - 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
medium risk
15 mm 1018 Gs
101.8 mT
3.15 kg / 6.94 LBS
3147.4 g / 30.9 N
medium risk
20 mm 688 Gs
68.8 mT
1.44 kg / 3.17 LBS
1439.4 g / 14.1 N
weak grip
30 mm 340 Gs
34.0 mT
0.35 kg / 0.77 LBS
350.8 g / 3.4 N
weak grip
50 mm 111 Gs
11.1 mT
0.04 kg / 0.08 LBS
37.1 g / 0.4 N
weak grip

Table 2: Shear capacity (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: Vertical assembly (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: 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 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: Thermal stability (material behavior) - thermal limit
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) - forces in the system
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 (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
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 (cracking risk) - 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 (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: 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%
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. Wall mount (shear)

*Warning: On a vertical surface, the magnet holds merely a fraction of its nominal pull.

2. Steel saturation

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

3. Power loss vs temp

*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

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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%
Ecology and recycling (GPSR)
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
Pulling force

Magnetic Induction

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 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 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. 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.
For mounting flat magnets MPL 45x25x10 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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).
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. In practice, this means that this magnet has the greatest attraction force on its main planes (45x25 mm), which is ideal for flat mounting. 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. The key parameter here is the lifting capacity amounting to approximately 28.48 kg (force ~279.40 N), which, with such a compact shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Advantages

Besides their exceptional pulling force, neodymium magnets offer the following advantages:
  • Their magnetic field remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by external field influence,
  • By using a decorative coating of silver, the element has an aesthetic look,
  • The surface of neodymium magnets generates a strong 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 modularity in constructing and the capacity to adapt to specific needs,
  • Fundamental importance in modern technologies – they are commonly used in data components, electric motors, precision medical tools, as well as technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Cons

Disadvantages of neodymium magnets:
  • At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of making threads in the magnet and complicated forms - preferred is a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these products can 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

Pull force analysis

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

The load parameter shown concerns the maximum value, obtained under ideal test conditions, namely:
  • with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
  • with a cross-section minimum 10 mm
  • characterized by lack of roughness
  • with total lack of distance (no coatings)
  • for force acting at a right angle (in the magnet axis)
  • in stable room temperature

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to elements below, in order of importance:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – ground elements ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with neodymium magnets
Adults only

Strictly keep magnets away from children. Choking hazard is high, and the consequences of magnets connecting inside the body are fatal.

Protect data

Do not bring magnets close to a wallet, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Crushing risk

Big blocks can crush fingers instantly. Do not place your hand betwixt two strong magnets.

Handling guide

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

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and use protective gear.

Shattering risk

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Heat warning

Avoid heat. NdFeB magnets are susceptible to heat. If you need operation above 80°C, look for special high-temperature series (H, SH, UH).

GPS Danger

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

ICD Warning

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Flammability

Drilling and cutting of NdFeB material poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Danger! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98