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MPL 40x10x18 / N38 - lamellar magnet

lamellar magnet

Catalog no 020149

GTIN/EAN: 5906301811558

Load capacity 16.72 kg / 164.01 N Magnetic Induction 540.48 mT / 5405 Gs
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
→ diametrical
Coating
[NiCuNi] Nickel
technical details »

18.45 zł with VAT / pcs + price for transport

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Detailed specification - MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet

properties
properties values
Cat. no. 020149
GTIN/EAN 5906301811558
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 10 mm [±0,1 mm]
Height 18 mm [±0,1 mm]
Weight 54 g
Magnetization Direction → diametrical
Load capacity ~ ? 16.72 kg / 164.01 N
Magnetic Induction ~ ? 540.48 mT / 5405 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / 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 simulation of the product - data

The following information represent the result of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Please consider these data as a reference point during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
MPL 40x10x18 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 5402 Gs
540.2 mT
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 critical level
1 mm 4664 Gs
466.4 mT
 12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
 critical level
2 mm 3970 Gs
397.0 mT
 9.03 kg / 19.90 lbs
9028.7 g / 88.6 N
 strong
3 mm 3362 Gs
336.2 mT
 6.48 kg / 14.28 lbs
6476.4 g / 63.5 N
 strong
5 mm 2432 Gs
243.2 mT
 3.39 kg / 7.47 lbs
3388.5 g / 33.2 N
 strong
10 mm 1220 Gs
122.0 mT
 0.85 kg / 1.88 lbs
853.2 g / 8.4 N
 safe
15 mm 703 Gs
70.3 mT
 0.28 kg / 0.62 lbs
282.9 g / 2.8 N
 safe
20 mm 440 Gs
44.0 mT
 0.11 kg / 0.24 lbs
111.1 g / 1.1 N
 safe
30 mm 203 Gs
20.3 mT
 0.02 kg / 0.05 lbs
23.6 g / 0.2 N
 safe
50 mm 64 Gs
6.4 mT
 0.00 kg / 0.01 lbs
2.4 g / 0.0 N
 safe
Pulling power weakens drastically with every subsequent millimeter of distance. Keep in mind that every additional insulation layer (e.g., dirt, paint, rust) strongly diminishes the holding power. Neodymiums operate most effectively at the point of direct contact; gap kills the force. Analyze how flashily the parameters fall, when the product does not adhere directly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Sliding load (vertical surface)
MPL 40x10x18 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
1 mm Stal (~0.2) 2.49 kg / 5.49 lbs
2492.0 g / 24.4 N
2 mm Stal (~0.2) 1.81 kg / 3.98 lbs
1806.0 g / 17.7 N
3 mm Stal (~0.2) 1.30 kg / 2.86 lbs
1296.0 g / 12.7 N
5 mm Stal (~0.2) 0.68 kg / 1.49 lbs
678.0 g / 6.7 N
10 mm Stal (~0.2) 0.17 kg / 0.37 lbs
170.0 g / 1.7 N
15 mm Stal (~0.2) 0.06 kg / 0.12 lbs
56.0 g / 0.5 N
20 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
30 mm Stal (~0.2) 0.00 kg / 0.01 lbs
4.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
0.0 g / 0.0 N
The table below presents the theoretical holding capacity required to start the shifting of the magnet downwards against a vertical steel wall (considering standard friction). This parameter varies with the distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x10x18 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
5.02 kg / 11.06 lbs
5016.0 g / 49.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.67 kg / 3.69 lbs
1672.0 g / 16.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
8.36 kg / 18.43 lbs
8360.0 g / 82.0 N
When placing a element on a upright surface (e.g., a board), it will only hold just about 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that magnets slide down easier than they pull off. Want to create a hanger? Remember that the shear force is noticeably lower than the maximum static pull force. On a painted metal, the element will slide down under a much lighter weight. Using a rubber coating can drastically raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x10x18 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.84 kg / 1.84 lbs
836.0 g / 8.2 N
1 mm
13%
 2.09 kg / 4.61 lbs
2090.0 g / 20.5 N
2 mm
25%
 4.18 kg / 9.22 lbs
4180.0 g / 41.0 N
3 mm
38%
 6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
5 mm
63%
 10.45 kg / 23.04 lbs
10450.0 g / 102.5 N
10 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
11 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
12 mm
100%
 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
A too thin steel is not enough to absorb the full magnetic flux, which wastes potential of the magnet. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this magnet's potential, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on thin elements (e.g., car bodies), the product works worse. We suggest choosing the steel dimension according to the table below.

Table 5: Thermal resistance (stability) - resistance threshold
MPL 40x10x18 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
 OK
40 °C -2.2% 16.35 kg / 36.05 lbs
16352.2 g / 160.4 N
 OK
60 °C -4.4% 15.98 kg / 35.24 lbs
15984.3 g / 156.8 N
 OK
80 °C -6.6% 15.62 kg / 34.43 lbs
15616.5 g / 153.2 N
100 °C -28.8% 11.90 kg / 26.25 lbs
11904.6 g / 116.8 N
Ordinary NdFeB products lose power above the temperature limit. Watch out for overheating – high temperature can irreversibly damage this product. With increasing heat, the magnet's power momentarily decreases. Refrain from using this product close to ovens higher than its safe range. Too high temperature will result in permanent loss of magnetism.
*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Red status in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x10x18 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 71.96 kg / 158.65 lbs
5 928 Gs
10.79 kg / 23.80 lbs
10794 g / 105.9 N
 N/A
1 mm 62.49 kg / 137.76 lbs
10 068 Gs
9.37 kg / 20.66 lbs
9373 g / 91.9 N
 56.24 kg / 123.98 lbs
~0 Gs
2 mm 53.65 kg / 118.27 lbs
9 328 Gs
8.05 kg / 17.74 lbs
8047 g / 78.9 N
 48.28 kg / 106.44 lbs
~0 Gs
3 mm 45.76 kg / 100.88 lbs
8 615 Gs
6.86 kg / 15.13 lbs
6864 g / 67.3 N
 41.18 kg / 90.79 lbs
~0 Gs
5 mm 32.92 kg / 72.58 lbs
7 308 Gs
4.94 kg / 10.89 lbs
4938 g / 48.4 N
 29.63 kg / 65.32 lbs
~0 Gs
10 mm 14.58 kg / 32.15 lbs
4 864 Gs
2.19 kg / 4.82 lbs
2188 g / 21.5 N
 13.13 kg / 28.94 lbs
~0 Gs
20 mm 3.67 kg / 8.10 lbs
2 441 Gs
0.55 kg / 1.21 lbs
551 g / 5.4 N
 3.30 kg / 7.29 lbs
~0 Gs
50 mm 0.21 kg / 0.46 lbs
585 Gs
0.03 kg / 0.07 lbs
32 g / 0.3 N
 0.19 kg / 0.42 lbs
~0 Gs
60 mm 0.10 kg / 0.22 lbs
406 Gs
0.02 kg / 0.03 lbs
15 g / 0.1 N
 0.09 kg / 0.20 lbs
~0 Gs
70 mm 0.05 kg / 0.12 lbs
293 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
 0.05 kg / 0.10 lbs
~0 Gs
80 mm 0.03 kg / 0.06 lbs
217 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
165 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.03 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
128 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two strong neodymiums interact from a wider radius than a neodymium and metal setup. Such a system of two magnets creates a more powerful interaction and a further horizon of action. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the pinch force is extreme. The repulsion force is slightly lower than the attraction, but still significant.
*Flux density between like poles is approximately ~0 Gs at the midpoint of the gap (resulting from vector opposition).
* Results apply to sliding force of two matching magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x10x18 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.5 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Mobile device 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.0 cm
A strong magnetic field poses a real danger to IT equipment and medical implants. These NdFeB products generate a flux that prevents correct functioning of sensitive medical devices. Remember: the unseen radiation passes through tissues and glass. Exceptional care must be exercised by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Collisions (kinetic energy) - collision effects
MPL 40x10x18 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.55 km/h
(4.32 m/s)
 0.50 J
30 mm 16.14 km/h
(4.48 m/s)
 0.54 J
50 mm 16.17 km/h
(4.49 m/s)
 0.54 J
100 mm 16.17 km/h
(4.49 m/s)
 0.54 J
Magnetic elements are prone to chipping – a strong collision with metal can result in shattering. Control the attraction moment – a neodymium left loose becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed ends with a crack of the neodymium. Use safety goggles when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 40x10x18 / 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 40x10x18 / N38

Parameter Value SI Unit / Description
Magnetic Flux 21 285 Mx 212.9 µWb
Pc Coefficient 0.79 High (Stable)
Flux value emitted by the pole surface. Essential parameter in coil applications and motors. Pc value defines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x10x18 / N38

Environment Effective steel pull Effect
Air (land) 16.72 kg Standard
Water (riverbed) 19.14 kg
(+2.42 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. Buoyancy helps in lifting finds.

1. Sliding resistance

*Note: On a vertical surface, the magnet retains only a fraction of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer case) significantly limits the holding force.

3. Temperature resistance

*For N38 material, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.79

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

Material specification

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: 020149-2026
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Component MPL 40x10x18 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 164.01 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x10x18 / 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. 16.72 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 40x10x18 / N38 model is magnetized through the thickness (dimension 18 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 40x10x18 mm, which, at a weight of 54 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 16.72 kg (force ~164.01 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 rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
  • Thanks to the metallic finish, the coating of Ni-Cu-Ni, gold, or silver-plated gives an modern appearance,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the capacity to modify to unusual requirements,
  • Huge importance in high-tech industry – they are used in magnetic memories, motor assemblies, diagnostic systems, as well as other advanced devices.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

What to avoid - cons of neodymium magnets and proposals for their use:
  • At 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 force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • Limited ability of producing threads in the magnet and complex forms - recommended is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical when they are in the body.
  • Due to neodymium price, their price is relatively high,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Breakaway force was determined for optimal configuration, taking into account:
  • with the application of a sheet made of low-carbon steel, ensuring maximum field concentration
  • whose thickness is min. 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (surface-to-surface)
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Lifting capacity in practice – influencing factors

Real force impacted by working environment parameters, including (from most important):
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet holds much less (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick plate does not close the flux, causing part of the power to be wasted to the other side.
  • Plate material – low-carbon steel attracts best. Higher carbon content lower magnetic properties and holding force.
  • Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.

Safe handling of NdFeB magnets
Warning for heart patients

Individuals with a pacemaker must maintain an safe separation from magnets. The magnetic field can disrupt the operation of the life-saving device.

Nickel allergy

Some people suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling may cause dermatitis. We suggest wear protective gloves.

Crushing force

Danger of trauma: The attraction force is so great that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Electronic hazard

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

Keep away from electronics

A strong magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Maintain magnets near a device to avoid damaging the sensors.

Immense force

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and do not underestimate their force.

This is not a toy

Always keep magnets away from children. Choking hazard is significant, and the consequences of magnets connecting inside the body are life-threatening.

Do not drill into magnets

Combustion risk: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.

Demagnetization risk

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

Magnet fragility

Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?