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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

check technical data »

35.01 ZŁ with VAT / pcs + price for transport

28.46 ZŁ net + 23% VAT / pcs

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Parameters along with structure of magnetic components can be analyzed using our force calculator.

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Technical specification of the product - 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 - technical parameters

The following information represent the result of a mathematical analysis. Values rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Please consider these data as a reference point when designing systems.

Table 1: Static force (force vs distance) - 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
 dangerous!
1 mm 2918 Gs
291.8 mT
 25.86 kg / 57.00 pounds
25856.7 g / 253.7 N
 dangerous!
2 mm 2760 Gs
276.0 mT
 23.13 kg / 51.00 pounds
23133.2 g / 226.9 N
 dangerous!
3 mm 2595 Gs
259.5 mT
 20.45 kg / 45.08 pounds
20449.5 g / 200.6 N
 dangerous!
5 mm 2261 Gs
226.1 mT
 15.53 kg / 34.23 pounds
15525.8 g / 152.3 N
 dangerous!
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
 safe
30 mm 340 Gs
34.0 mT
 0.35 kg / 0.77 pounds
350.8 g / 3.4 N
 safe
50 mm 111 Gs
11.1 mT
 0.04 kg / 0.08 pounds
37.1 g / 0.4 N
 safe
Pulling power drops significantly with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, varnish, dust) strongly diminishes the holding power. Neodymiums operate most effectively at the point of direct contact; distance kills the force. Observe how flashily the parameters plummet, when the magnet does not adhere flatly to the steel surface. When calculating the arrangement, discard redundant distances.

Table 2: Slippage force (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 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
This section defines the approximate force necessary to start the sliding of the magnet down along a vertical metal surface (assuming typical friction coefficient). The holding force is relative to the air gap between the magnet and the surface.

Table 3: Vertical assembly (shearing) - 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 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
When hanging a element on a vertical surface (e.g., a car body), it will maintain barely about 20%-30% of its maximum pull force. Gravity and a weak degree of grip mean that holders slide down easier than they detach. Want to create a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slip down under a significantly smaller load. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (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
A thin metal plate is unable to take in the entire magnetic field, which wastes potential of the holder. Should you mount a strong magnet to a weak sheet, the flux will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick piece of metal. The material oversaturation causes that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal resistance (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
Standard neodymium magnets irreversibly lose strength after exceeding the maximum temperature. Protect against heat – excessive heat can permanently destroy this magnet. With every degree above norm, the neodymium's power briefly lowers. Do not use this product near heat sources higher than its operating temperature limit. Ignoring the limit will cause destruction of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) risk losing magnetic properties under lower heat stress than long magnets. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (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
Two strong neodymiums interact from a significantly greater distance than a magnet and steel combination. Such a system of two magnets generates a stronger field and a further horizon of operation. Want to build a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the pinch force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (resulting from vector opposition).
Note: Figures show friction force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (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
Powerful magnet radiation is a real danger to electronics as well as medical implants. These magnets produce a field that prevents correct functioning of digital equipment. Remember: the invisible magnetic field passes through tissues and housings. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or precise measuring instruments.

Table 8: Collisions (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
Magnetic elements are very brittle – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely speeds with massive force. Impact energy can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear eye protection when playing with large magnets.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Note the thickness of the protective layer.

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)
Total magnetic flux passing through the pole surface. Key data in coil applications as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Hydrostatics and buoyancy
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!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Steel saturation

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

3. Heat tolerance

*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

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.

Technical specification and ecology
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%
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
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This product is an extremely strong plate magnet 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. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. Watch your fingers! Magnets with a force of 28.48 kg can pinch very hard and cause hematomas. 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. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 45x25x10 / N38, it is best to use 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. 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 axially (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.
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 power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of Nd2Fe14B magnets.

Pros

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • Their magnetic field is maintained, and after around 10 years it decreases only by ~1% (according to research),
  • Magnets perfectly defend themselves against demagnetization caused by ambient magnetic noise,
  • In other words, due to the shiny layer of silver, the element is aesthetically pleasing,
  • Magnetic induction on the surface of the magnet is extremely intense,
  • 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...
  • Thanks to modularity in shaping and the ability to adapt to unusual requirements,
  • Huge importance in advanced technology sectors – they are commonly used in hard drives, electromotive mechanisms, medical equipment, also multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages

What to avoid - cons of neodymium magnets: application proposals
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • 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 and corrosion.
  • We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Pull force analysis

Magnetic strength at its maximum – what it depends on?

Information about lifting capacity was defined for ideal contact conditions, assuming:
  • using a base made of high-permeability steel, serving as a circuit closing element
  • possessing a massiveness of min. 10 mm to ensure full flux closure
  • characterized by even structure
  • under conditions of gap-free contact (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force results from many variables, ranked from most significant:
  • Distance – existence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Metal type – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

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

Safe handling of neodymium magnets
Compass and GPS

An intense magnetic field interferes with the operation of magnetometers in phones and GPS navigation. Keep magnets close to a smartphone to prevent damaging the sensors.

Hand protection

Big blocks can smash fingers in a fraction of a second. Never place your hand between two attracting surfaces.

Metal Allergy

Medical facts indicate that the nickel plating (the usual finish) is a strong allergen. For allergy sufferers, avoid touching magnets with bare hands or opt for versions in plastic housing.

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.

Adults only

Only for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from children and animals.

Do not overheat magnets

Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Threat to electronics

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Protective goggles

Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets will cause them shattering into small pieces.

Powerful field

Be careful. Neodymium magnets attract from a distance and snap with massive power, often faster than you can react.

Mechanical processing

Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Warning! Looking for details? Check our post: Are neodymium magnets dangerous?