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MPL 40x15x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020153

GTIN/EAN: 5906301811596

5.00

length

40 mm [±0,1 mm]

Width

15 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

22.5 g

Magnetization Direction

↑ axial

Load capacity

11.35 kg / 111.37 N

Magnetic Induction

249.11 mT / 2491 Gs

Coating

[NiCuNi] Nickel

see parameters »

7.63 ZŁ with VAT / pcs + price for transport

6.20 ZŁ net + 23% VAT / pcs

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Technical - MPL 40x15x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x15x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020153
GTIN/EAN 5906301811596
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 40 mm [±0,1 mm]
Width 15 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 22.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 11.35 kg / 111.37 N
Magnetic Induction ~ ? 249.11 mT / 2491 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x15x5 / 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 modeling of the assembly - technical parameters

The following information represent the outcome of a mathematical analysis. Values rely on models for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs distance) - characteristics
MPL 40x15x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2490 Gs
249.0 mT
 11.35 kg / 25.02 LBS
11350.0 g / 111.3 N
 critical level
1 mm 2306 Gs
230.6 mT
 9.73 kg / 21.45 LBS
9731.3 g / 95.5 N
 warning
2 mm 2095 Gs
209.5 mT
 8.03 kg / 17.70 LBS
8028.8 g / 78.8 N
 warning
3 mm 1877 Gs
187.7 mT
 6.45 kg / 14.21 LBS
6445.4 g / 63.2 N
 warning
5 mm 1472 Gs
147.2 mT
 3.97 kg / 8.74 LBS
3965.1 g / 38.9 N
 warning
10 mm 792 Gs
79.2 mT
 1.15 kg / 2.53 LBS
1147.1 g / 11.3 N
 low risk
15 mm 454 Gs
45.4 mT
 0.38 kg / 0.83 LBS
376.9 g / 3.7 N
 low risk
20 mm 278 Gs
27.8 mT
 0.14 kg / 0.31 LBS
141.4 g / 1.4 N
 low risk
30 mm 122 Gs
12.2 mT
 0.03 kg / 0.06 LBS
27.0 g / 0.3 N
 low risk
50 mm 35 Gs
3.5 mT
 0.00 kg / 0.01 LBS
2.3 g / 0.0 N
 low risk
Pulling power decreases sharply per each millimeter of distance. Keep in mind that even the smallest gap (e.g., contamination, paint, rust) strongly reduces the pull force. Magnets hold optimally at the point of direct contact; air break weakens the force. Notice how flashily the load capacity drop, when the magnet does not touch directly to the steel surface. When planning the assembly, avoid redundant distances.

Table 2: Sliding force (wall)
MPL 40x15x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.27 kg / 5.00 LBS
2270.0 g / 22.3 N
1 mm Stal (~0.2) 1.95 kg / 4.29 LBS
1946.0 g / 19.1 N
2 mm Stal (~0.2) 1.61 kg / 3.54 LBS
1606.0 g / 15.8 N
3 mm Stal (~0.2) 1.29 kg / 2.84 LBS
1290.0 g / 12.7 N
5 mm Stal (~0.2) 0.79 kg / 1.75 LBS
794.0 g / 7.8 N
10 mm Stal (~0.2) 0.23 kg / 0.51 LBS
230.0 g / 2.3 N
15 mm Stal (~0.2) 0.08 kg / 0.17 LBS
76.0 g / 0.7 N
20 mm Stal (~0.2) 0.03 kg / 0.06 LBS
28.0 g / 0.3 N
30 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
This section calculates the approximate force necessary to start the shifting of the magnet down along a vertical steel plate (assuming typical friction). This value is relative to the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x15x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.41 kg / 7.51 LBS
3405.0 g / 33.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.27 kg / 5.00 LBS
2270.0 g / 22.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.14 kg / 2.50 LBS
1135.0 g / 11.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.68 kg / 12.51 LBS
5675.0 g / 55.7 N
When mounting a element on a vertical plane (e.g., a car body), it will only hold only about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient cause that products move down faster than they pop off the substrate. Planning a hanger? Consider that the shear force is much weaker than the maximum static pull force. On a smooth steel, the holder will slip down under a much lighter load. Using a rubber layer can significantly improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 40x15x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.57 kg / 1.25 LBS
567.5 g / 5.6 N
1 mm
13%
 1.42 kg / 3.13 LBS
1418.8 g / 13.9 N
2 mm
25%
 2.84 kg / 6.26 LBS
2837.5 g / 27.8 N
3 mm
38%
 4.26 kg / 9.38 LBS
4256.3 g / 41.8 N
5 mm
63%
 7.09 kg / 15.64 LBS
7093.8 g / 69.6 N
10 mm
100%
 11.35 kg / 25.02 LBS
11350.0 g / 111.3 N
11 mm
100%
 11.35 kg / 25.02 LBS
11350.0 g / 111.3 N
12 mm
100%
 11.35 kg / 25.02 LBS
11350.0 g / 111.3 N
A thin metal plate cannot absorb the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a weak sheet, the flux will penetrate right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid backing of steel. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We recommend selecting the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MPL 40x15x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 11.35 kg / 25.02 LBS
11350.0 g / 111.3 N
 OK
40 °C -2.2% 11.10 kg / 24.47 LBS
11100.3 g / 108.9 N
 OK
60 °C -4.4% 10.85 kg / 23.92 LBS
10850.6 g / 106.4 N
80 °C -6.6% 10.60 kg / 23.37 LBS
10600.9 g / 104.0 N
100 °C -28.8% 8.08 kg / 17.82 LBS
8081.2 g / 79.3 N
Classic neodymiums irreversibly lose parameters after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this magnet. As the temperature rises, the magnet's force momentarily decreases. Refrain from using this magnet close to heaters higher than its safe range. Exceeding the critical threshold will result in permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (pancake types) are more susceptible to demagnetization at lower temperatures than long magnets. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field collision
MPL 40x15x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 22.94 kg / 50.58 LBS
3 961 Gs
3.44 kg / 7.59 LBS
3441 g / 33.8 N
 N/A
1 mm 21.37 kg / 47.11 LBS
4 807 Gs
3.21 kg / 7.07 LBS
3205 g / 31.4 N
 19.23 kg / 42.40 LBS
~0 Gs
2 mm 19.67 kg / 43.37 LBS
4 612 Gs
2.95 kg / 6.50 LBS
2951 g / 28.9 N
 17.70 kg / 39.03 LBS
~0 Gs
3 mm 17.94 kg / 39.55 LBS
4 404 Gs
2.69 kg / 5.93 LBS
2691 g / 26.4 N
 16.15 kg / 35.59 LBS
~0 Gs
5 mm 14.58 kg / 32.15 LBS
3 971 Gs
2.19 kg / 4.82 LBS
2187 g / 21.5 N
 13.12 kg / 28.93 LBS
~0 Gs
10 mm 8.01 kg / 17.67 LBS
2 944 Gs
1.20 kg / 2.65 LBS
1202 g / 11.8 N
 7.21 kg / 15.90 LBS
~0 Gs
20 mm 2.32 kg / 5.11 LBS
1 583 Gs
0.35 kg / 0.77 LBS
348 g / 3.4 N
 2.09 kg / 4.60 LBS
~0 Gs
50 mm 0.12 kg / 0.26 LBS
359 Gs
0.02 kg / 0.04 LBS
18 g / 0.2 N
 0.11 kg / 0.24 LBS
~0 Gs
60 mm 0.05 kg / 0.12 LBS
243 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
70 mm 0.03 kg / 0.06 LBS
171 Gs
0.00 kg / 0.01 LBS
4 g / 0.0 N
 0.02 kg / 0.05 LBS
~0 Gs
80 mm 0.01 kg / 0.03 LBS
124 Gs
0.00 kg / 0.00 LBS
2 g / 0.0 N
 0.01 kg / 0.03 LBS
~0 Gs
90 mm 0.01 kg / 0.02 LBS
92 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.01 LBS
70 Gs
0.00 kg / 0.00 LBS
1 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two strong neodymiums interact from a wider radius than a magnet and sheet setup. The setup of magnet-to-magnet generates a stronger field and a wider radius of performance. Designing a solid fastener? Apply two magnets instead of one magnet and a striker plate. Remember that when connecting a pair of magnets, the impact force is massive. The levitation is slightly lower than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).
Attention: Estimates refer to shear force of two same neodymium magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (electronics) - warnings
MPL 40x15x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 10.5 cm
Hearing aid 10 Gs (1.0 mT) 8.0 cm
Timepiece 20 Gs (2.0 mT) 6.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.0 cm
Remote 50 Gs (5.0 mT) 4.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Extremely neodym field poses a large risk to electronic devices as well as medical implants. These neodymiums produce a flux that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation passes through tissues and glass. Increased vigilance must be exercised by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - collision effects
MPL 40x15x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 24.04 km/h
(6.68 m/s)
 0.50 J
30 mm 39.29 km/h
(10.91 m/s)
 1.34 J
50 mm 50.66 km/h
(14.07 m/s)
 2.23 J
100 mm 71.63 km/h
(19.90 m/s)
 4.45 J
Magnetic elements are prone to chipping – a collision with steel causes immediate chipping. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or painful pinches to fingers. Always hold the magnet during bringing near metal so it doesn't hit violently against the metal. A collision at high speed means shattering of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
MPL 40x15x5 / 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)
For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 40x15x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 14 969 Mx 149.7 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value passing through the magnet pole. Essential parameter in coil applications as well as sensors. Pc value determines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x15x5 / N38

Environment Effective steel pull Effect
Air (land) 11.35 kg Standard
Water (riverbed) 13.00 kg
(+1.65 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Water displaces steel, making heavy objects slightly lighter. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical surface, the magnet retains just ~20% of its nominal pull.

2. Plate thickness effect

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

3. Heat tolerance

*For standard magnets, the safety limit is 80°C.

4. Demagnetization curve and operating point (B-H)

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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
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: 020153-2026
Quick Unit Converter
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 40x15x5 mm and a weight of 22.5 g, guarantees the highest quality connection. This magnetic block with a force of 111.37 N is ready for shipment in 24h, allowing for rapid realization of your project. 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 40x15x5 / 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. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 40x15x5 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. Thanks to the flat surface and high force (approx. 11.35 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.
For mounting flat magnets MPL 40x15x5 / 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).
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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 15 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 11.35 kg (force ~111.37 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Strengths

In addition to their magnetic capacity, neodymium magnets provide the following advantages:
  • They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
  • They feature excellent resistance to weakening of magnetic properties as a result of external fields,
  • Thanks to the glossy finish, the surface of nickel, gold-plated, or silver gives an modern appearance,
  • Magnetic induction on the surface of the magnet remains maximum,
  • Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
  • Thanks to versatility in shaping and the capacity to customize to unusual requirements,
  • Significant place in advanced technology sectors – they find application in computer drives, electromotive mechanisms, diagnostic systems, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in miniature devices

Limitations

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its 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
  • They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing nuts and complex shapes in magnets, we propose using a housing - magnetic mechanism.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what affects it?

Magnet power was defined for ideal contact conditions, including:
  • with the application of a sheet made of special test steel, ensuring maximum field concentration
  • whose transverse dimension reaches at least 10 mm
  • with a surface free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Effective lifting capacity is affected by working environment parameters, such as (from priority):
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
  • Steel thickness – too thin sheet does not close the flux, causing part of the flux to be escaped to the other side.
  • Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal environment – temperature increase causes a temporary drop of force. Check the maximum operating temperature for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

H&S for magnets
Data carriers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, medical aids, timepieces).

Risk of cracking

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.

Crushing force

Large magnets can smash fingers instantly. Never place your hand betwixt two strong magnets.

Allergic reactions

Certain individuals experience a sensitization to Ni, which is the standard coating for neodymium magnets. Extended handling may cause dermatitis. We suggest use protective gloves.

Health Danger

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Threat to navigation

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.

Maximum temperature

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.

No play value

Strictly keep magnets away from children. Ingestion danger is high, and the effects of magnets connecting inside the body are very dangerous.

Fire risk

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Respect the power

Use magnets consciously. Their powerful strength can surprise even professionals. Stay alert and do not underestimate their force.

Caution! Details about risks in the article: Magnet Safety Guide.