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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

view 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

Engineering analysis of the magnet - report

These data are the direct effect of a engineering simulation. Values are based on algorithms for the material Nd2Fe14B. Real-world conditions may deviate from the simulation results. Please consider these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - power drop
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
 crushing
1 mm 2306 Gs
230.6 mT
 9.73 kg / 21.45 lbs
9731.3 g / 95.5 N
 strong
2 mm 2095 Gs
209.5 mT
 8.03 kg / 17.70 lbs
8028.8 g / 78.8 N
 strong
3 mm 1877 Gs
187.7 mT
 6.45 kg / 14.21 lbs
6445.4 g / 63.2 N
 strong
5 mm 1472 Gs
147.2 mT
 3.97 kg / 8.74 lbs
3965.1 g / 38.9 N
 strong
10 mm 792 Gs
79.2 mT
 1.15 kg / 2.53 lbs
1147.1 g / 11.3 N
 weak grip
15 mm 454 Gs
45.4 mT
 0.38 kg / 0.83 lbs
376.9 g / 3.7 N
 weak grip
20 mm 278 Gs
27.8 mT
 0.14 kg / 0.31 lbs
141.4 g / 1.4 N
 weak grip
30 mm 122 Gs
12.2 mT
 0.03 kg / 0.06 lbs
27.0 g / 0.3 N
 weak grip
50 mm 35 Gs
3.5 mT
 0.00 kg / 0.01 lbs
2.3 g / 0.0 N
 weak grip
Grip strength drops drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., dirt, varnish, dust) strongly reduces the pull force. Neodymiums work optimally at the point of direct contact; distance weakens the force. Observe how flashily the load capacity fall, when the product does not touch tightly to the steel surface. When planning the assembly, avoid additional spacers.

Table 2: Vertical 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 defines the estimated holding capacity necessary to start the shifting of the magnet vertically along a upright steel wall (assuming standard friction coefficient). This value depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
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 hanging a holder on a upright wall (e.g., a fridge), it you can count on barely about 20%-30% of its maximum pull force. Gravitational force and a weak degree of grip influence the fact that magnets slip easier than they pull off. Designing a hanger? Remember that the sliding force is much weaker than the perpendicular breakaway force. On a slippery surface, the element will slide down under a noticeably lighter load. Application of an anti-slip layer can effectively 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 sheet cannot absorb the entire magnetic field, which wastes potential of the magnet. Should you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To achieve the maximum of this neodymium's potential, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on thin elements (e.g., appliance housings), the magnet holds weaker. We advise picking the steel thickness from these parameters.

Table 5: Thermal stability (material behavior) - 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 change their properties power after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly destroy this product. With increasing heat, the neodymium's power briefly drops. Do not use this product in hot environments exceeding its operating temperature limit. Ignoring the limit will result in destruction of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) may lose charge permanently sooner compared to rod magnets. The danger warning in the table points to a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x15x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding 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 magnetic products interact from a much further distance than a magnet and steel combination. The connection of two magnets creates a more powerful interaction and a further horizon of operation. Designing a solid fastener? Use a pair of magnets instead of one magnet and a striker plate. Remember that when attracting two neodymiums, the impact force is extreme. The levitation is a bit weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).
Note: Calculations show shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 5.0 cm
Car key 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 serious hazard to electronic devices as well as medical implants. These neodymiums generate a field that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and housings. Special caution must be exercised by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - 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
NdFeB products are very brittle – a strong collision with metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Kinetic force can destroy the magnet or painful pinches to skin. Always hold the magnet during installation so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the neodymium. Use safety goggles when handling with powerful specimens.

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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical 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 pole surface. Key data for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Physics of underwater searching
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%
Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.
1. Vertical hold

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

2. Steel thickness impact

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

3. Thermal stability

*For N38 material, the critical limit is 80°C.

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

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

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.

Technical and environmental data
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: 020153-2026
Quick Unit Converter
Pulling force
Field Strength
Input a value in any box, and the remaining fields change on the fly.

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This product is a very powerful magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x15x5 mm and a weight of 22.5 g, guarantees premium class connection. This rectangular block with a force of 111.37 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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.
They constitute a key element in the production of wind generators and material handling systems. 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. 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. 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: 40 mm (length), 15 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 11.35 kg (force ~111.37 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd2Fe14B magnets.

Strengths

Besides their remarkable field intensity, neodymium magnets offer the following advantages:
  • Their magnetic field is durable, and after approximately 10 years it drops only by ~1% (according to research),
  • They are noted for resistance to demagnetization induced by presence of other magnetic fields,
  • In other words, due to the aesthetic surface of nickel, the element looks attractive,
  • Magnets possess extremely high magnetic induction on the outer layer,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Due to the potential of free shaping and adaptation to individualized requirements, NdFeB magnets can be created in a broad palette of shapes and sizes, which increases their versatility,
  • Key role in high-tech industry – they are commonly used in computer drives, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of NdFeB magnets:
  • At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as 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 power (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 very resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic mount.
  • Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that tiny parts 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

Holding force characteristics

Highest magnetic holding force – what contributes to it?

The load parameter shown represents the limit force, obtained under optimal environment, specifically:
  • on a plate made of mild steel, effectively closing the magnetic flux
  • possessing a massiveness of at least 10 mm to ensure full flux closure
  • characterized by even structure
  • with direct contact (without coatings)
  • under vertical force direction (90-degree angle)
  • in neutral thermal conditions

Key elements affecting lifting force

It is worth knowing that the magnet holding will differ depending on the following factors, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the plate is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces reduce efficiency.
  • Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the holding force.

Warnings
Respect the power

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

Dust is flammable

Dust produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

Pinching danger

Pinching hazard: The attraction force is so immense that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Keep away from electronics

Navigation devices and smartphones are highly susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can permanently damage the sensors in your phone.

Medical interference

Warning for patients: Powerful magnets affect medical devices. Maintain at least 30 cm distance or request help to work with the magnets.

Thermal limits

Watch the temperature. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Avoid contact if allergic

Certain individuals have a hypersensitivity to nickel, which is the typical protective layer for NdFeB magnets. Frequent touching can result in a rash. We suggest wear protective gloves.

Safe distance

Intense magnetic fields can destroy records on payment cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Protective goggles

NdFeB magnets are sintered ceramics, which means they are very brittle. Collision of two magnets leads to them breaking into small pieces.

Keep away from children

Only for adults. Small elements can be swallowed, leading to intestinal necrosis. Keep out of reach of children and animals.

Danger! Need more info? Check our post: Are neodymium magnets dangerous?