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MPL 40x18x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020156

GTIN/EAN: 5906301811626

5.00

length

40 mm [±0,1 mm]

Width

18 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

↑ axial

Load capacity

23.81 kg / 233.58 N

Magnetic Induction

366.66 mT / 3667 Gs

Coating

[NiCuNi] Nickel

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30.75 ZŁ with VAT / pcs + price for transport

25.00 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 40x18x10 / N38 - lamellar magnet

Specification / characteristics - MPL 40x18x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020156
GTIN/EAN 5906301811626
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 18 mm [±0,1 mm]
Height 10 mm [±0,1 mm]
Weight 54 g
Magnetization Direction ↑ axial
Load capacity ~ ? 23.81 kg / 233.58 N
Magnetic Induction ~ ? 366.66 mT / 3667 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x18x10 / 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 product - data

These information constitute the outcome of a engineering simulation. Values rely on algorithms for the material Nd2Fe14B. Actual parameters might slightly differ. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - power drop
MPL 40x18x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3666 Gs
366.6 mT
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
 critical level
1 mm 3399 Gs
339.9 mT
 20.48 kg / 45.14 lbs
20476.1 g / 200.9 N
 critical level
2 mm 3120 Gs
312.0 mT
 17.25 kg / 38.02 lbs
17245.9 g / 169.2 N
 critical level
3 mm 2841 Gs
284.1 mT
 14.30 kg / 31.54 lbs
14304.1 g / 140.3 N
 critical level
5 mm 2321 Gs
232.1 mT
 9.55 kg / 21.05 lbs
9547.8 g / 93.7 N
 strong
10 mm 1370 Gs
137.0 mT
 3.32 kg / 7.33 lbs
3324.4 g / 32.6 N
 strong
15 mm 833 Gs
83.3 mT
 1.23 kg / 2.71 lbs
1229.0 g / 12.1 N
 weak grip
20 mm 530 Gs
53.0 mT
 0.50 kg / 1.10 lbs
498.1 g / 4.9 N
 weak grip
30 mm 244 Gs
24.4 mT
 0.11 kg / 0.23 lbs
105.3 g / 1.0 N
 weak grip
50 mm 75 Gs
7.5 mT
 0.01 kg / 0.02 lbs
9.9 g / 0.1 N
 weak grip
Magnetic force decreases drastically with every subsequent millimeter of spacing. Keep in mind that even the smallest gap (e.g., contamination, varnish, dust) significantly weakens the grip. Neodymiums hold optimally at the point of direct contact; gap nullifies the force. Observe how rapidly the load capacity drop, when the product does not adhere tightly to the metal substrate. When designing the mounting, eliminate additional spacers.

Table 2: Vertical load (wall)
MPL 40x18x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
1 mm Stal (~0.2) 4.10 kg / 9.03 lbs
4096.0 g / 40.2 N
2 mm Stal (~0.2) 3.45 kg / 7.61 lbs
3450.0 g / 33.8 N
3 mm Stal (~0.2) 2.86 kg / 6.31 lbs
2860.0 g / 28.1 N
5 mm Stal (~0.2) 1.91 kg / 4.21 lbs
1910.0 g / 18.7 N
10 mm Stal (~0.2) 0.66 kg / 1.46 lbs
664.0 g / 6.5 N
15 mm Stal (~0.2) 0.25 kg / 0.54 lbs
246.0 g / 2.4 N
20 mm Stal (~0.2) 0.10 kg / 0.22 lbs
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 lbs
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
The table below defines the estimated holding capacity needed to initiate the slippage of the magnet vertically along a upright steel wall (assuming typical friction coefficient). The holding force is relative to the distance between the magnet and the surface.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 40x18x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
7.14 kg / 15.75 lbs
7143.0 g / 70.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.76 kg / 10.50 lbs
4762.0 g / 46.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.38 kg / 5.25 lbs
2381.0 g / 23.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
11.91 kg / 26.25 lbs
11905.0 g / 116.8 N
When placing a element on a upright wall (e.g., a fridge), it you can count on just about 1/5 of nominal attraction strength. Gravity and a low friction coefficient mean that holders slide down easier than they pull off. Planning a hanger? Remember that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the element will slip down under a significantly smaller cargo. Utilizing a rubberized pad can effectively raise the stability.

Table 4: Material efficiency (substrate influence) - power losses
MPL 40x18x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.19 kg / 2.62 lbs
1190.5 g / 11.7 N
1 mm
13%
 2.98 kg / 6.56 lbs
2976.3 g / 29.2 N
2 mm
25%
 5.95 kg / 13.12 lbs
5952.5 g / 58.4 N
3 mm
38%
 8.93 kg / 19.68 lbs
8928.7 g / 87.6 N
5 mm
63%
 14.88 kg / 32.81 lbs
14881.3 g / 146.0 N
10 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
11 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
12 mm
100%
 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
A thin sheet is unable to take in the full magnetic flux, which squanders power of the magnet. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the holding will be smaller. To achieve 100% of this neodymium's power, you require a sufficiently solid element of steel. The saturation phenomenon means that on delicate walls (e.g., appliance housings), the magnet works worse. We advise picking the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - power drop
MPL 40x18x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 23.81 kg / 52.49 lbs
23810.0 g / 233.6 N
 OK
40 °C -2.2% 23.29 kg / 51.34 lbs
23286.2 g / 228.4 N
 OK
60 °C -4.4% 22.76 kg / 50.18 lbs
22762.4 g / 223.3 N
80 °C -6.6% 22.24 kg / 49.03 lbs
22238.5 g / 218.2 N
100 °C -28.8% 16.95 kg / 37.37 lbs
16952.7 g / 166.3 N
Classic neodymiums change their properties strength above the temperature limit. Protect against heat – heat can irreversibly damage this product. With increasing heat, the neodymium's power temporarily lowers. Refrain from using this magnet close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Low-profile magnets (pancake types) may lose charge permanently sooner than taller cylinders. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x18x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 59.64 kg / 131.49 lbs
5 034 Gs
8.95 kg / 19.72 lbs
8947 g / 87.8 N
 N/A
1 mm 55.50 kg / 122.35 lbs
7 072 Gs
8.32 kg / 18.35 lbs
8325 g / 81.7 N
 49.95 kg / 110.12 lbs
~0 Gs
2 mm 51.29 kg / 113.08 lbs
6 799 Gs
7.69 kg / 16.96 lbs
7694 g / 75.5 N
 46.16 kg / 101.77 lbs
~0 Gs
3 mm 47.18 kg / 104.01 lbs
6 520 Gs
7.08 kg / 15.60 lbs
7076 g / 69.4 N
 42.46 kg / 93.61 lbs
~0 Gs
5 mm 39.41 kg / 86.88 lbs
5 959 Gs
5.91 kg / 13.03 lbs
5912 g / 58.0 N
 35.47 kg / 78.20 lbs
~0 Gs
10 mm 23.92 kg / 52.73 lbs
4 643 Gs
3.59 kg / 7.91 lbs
3588 g / 35.2 N
 21.53 kg / 47.46 lbs
~0 Gs
20 mm 8.33 kg / 18.36 lbs
2 739 Gs
1.25 kg / 2.75 lbs
1249 g / 12.3 N
 7.49 kg / 16.52 lbs
~0 Gs
50 mm 0.55 kg / 1.22 lbs
705 Gs
0.08 kg / 0.18 lbs
83 g / 0.8 N
 0.50 kg / 1.09 lbs
~0 Gs
60 mm 0.26 kg / 0.58 lbs
487 Gs
0.04 kg / 0.09 lbs
40 g / 0.4 N
 0.24 kg / 0.52 lbs
~0 Gs
70 mm 0.13 kg / 0.30 lbs
348 Gs
0.02 kg / 0.04 lbs
20 g / 0.2 N
 0.12 kg / 0.27 lbs
~0 Gs
80 mm 0.07 kg / 0.16 lbs
256 Gs
0.01 kg / 0.02 lbs
11 g / 0.1 N
 0.07 kg / 0.14 lbs
~0 Gs
90 mm 0.04 kg / 0.09 lbs
194 Gs
0.01 kg / 0.01 lbs
6 g / 0.1 N
 0.04 kg / 0.08 lbs
~0 Gs
100 mm 0.02 kg / 0.05 lbs
149 Gs
0.00 kg / 0.01 lbs
4 g / 0.0 N
 0.02 kg / 0.05 lbs
~0 Gs
Two magnetic products interact from a wider radius than a magnet and sheet setup. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a powerful holder? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the impact force is huge. The repulsion force is a bit weaker than the connection force, but still impressive.
*Flux density between like poles drops to ~0 Gs at the midpoint between the magnets (due to field cancellation).
Note: Figures apply to sliding force of two matching neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (electronics) - warnings
MPL 40x18x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 14.0 cm
Hearing aid 10 Gs (1.0 mT) 11.0 cm
Mechanical watch 20 Gs (2.0 mT) 8.5 cm
Phone / Smartphone 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
Extremely neodym field is a serious hazard to electronics and pacemakers. These magnets generate a field that disrupts operation of digital equipment. Remember: the unseen radiation penetrates the body and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MPL 40x18x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.95 km/h
(6.38 m/s)
 1.10 J
30 mm 36.78 km/h
(10.22 m/s)
 2.82 J
50 mm 47.37 km/h
(13.16 m/s)
 4.67 J
100 mm 66.97 km/h
(18.60 m/s)
 9.34 J
Neodymium magnets are delicate – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Impact energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
MPL 40x18x10 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 40x18x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 26 060 Mx 260.6 µWb
Pc Coefficient 0.43 Low (Flat)
Flux value emitted by the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 40x18x10 / N38

Environment Effective steel pull Effect
Air (land) 23.81 kg Standard
Water (riverbed) 27.26 kg
(+3.45 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Shear force

*Caution: On a vertical wall, the magnet holds merely ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Power loss vs temp

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.43

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
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%
Sustainability
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: 020156-2026
Magnet Unit Converter
Force (pull)
Magnetic Induction
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Model MPL 40x18x10 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. This rectangular block with a force of 233.58 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 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 23.81 kg can pinch very hard and cause hematomas. 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. 23.81 kg), they are ideal as closers 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. 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 40x18x10 / 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.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 18 mm (width), and 10 mm (thickness). It is a magnetic block with dimensions 40x18x10 mm and a self-weight of 54 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Pros

Besides their magnetic performance, neodymium magnets are valued for these benefits:
  • They have stable power, and over more than 10 years their attraction force decreases symbolically – ~1% (in testing),
  • They have excellent resistance to weakening of magnetic properties when exposed to external magnetic sources,
  • By using a reflective coating of gold, the element presents an nice look,
  • Magnetic induction on the working part of the magnet is very high,
  • 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...
  • Thanks to flexibility in designing and the capacity to adapt to individual projects,
  • Versatile presence in electronics industry – they find application in mass storage devices, brushless drives, diagnostic systems, and industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in miniature devices

Limitations

Problematic aspects of neodymium magnets: tips and applications.
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of creating threads in the magnet and complex shapes - preferred is casing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these devices can be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

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

The lifting capacity listed is a result of laboratory testing executed under the following configuration:
  • with the contact of a sheet made of special test steel, ensuring maximum field concentration
  • with a cross-section minimum 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without paint)
  • for force acting at a right angle (in the magnet axis)
  • at conditions approx. 20°C

Key elements affecting lifting force

Real force is affected by working environment parameters, including (from most important):
  • Distance (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
  • Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the surface is standardly 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.
  • Material composition – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Plate texture – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Precautions when working with NdFeB magnets
Serious injuries

Pinching hazard: The pulling power is so great that it can result in hematomas, crushing, and even bone fractures. Use thick gloves.

Conscious usage

Before use, read the rules. Sudden snapping can destroy the magnet or injure your hand. Think ahead.

Mechanical processing

Machining of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Compass and GPS

GPS units and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Keep away from computers

Equipment safety: Strong magnets can damage data carriers and sensitive devices (heart implants, medical aids, mechanical watches).

Nickel coating and allergies

Certain individuals have a sensitization to Ni, which is the common plating for neodymium magnets. Extended handling may cause a rash. We strongly advise wear protective gloves.

Beware of splinters

Despite metallic appearance, the material is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.

Keep away from children

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of children and animals.

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Keep minimum 30 cm distance or ask another person to handle the magnets.

Heat sensitivity

Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.

Important! Learn more about risks in the article: Magnet Safety Guide.