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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

technical parameters »

30.75 ZŁ with VAT / pcs + price for transport

25.00 ZŁ net + 23% VAT / pcs

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Technical data - 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

Engineering simulation of the assembly - report

Presented data constitute the outcome of a physical calculation. Results are based on algorithms for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Use these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - characteristics
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 pounds
23810.0 g / 233.6 N
 critical level
1 mm 3399 Gs
339.9 mT
 20.48 kg / 45.14 pounds
20476.1 g / 200.9 N
 critical level
2 mm 3120 Gs
312.0 mT
 17.25 kg / 38.02 pounds
17245.9 g / 169.2 N
 critical level
3 mm 2841 Gs
284.1 mT
 14.30 kg / 31.54 pounds
14304.1 g / 140.3 N
 critical level
5 mm 2321 Gs
232.1 mT
 9.55 kg / 21.05 pounds
9547.8 g / 93.7 N
 strong
10 mm 1370 Gs
137.0 mT
 3.32 kg / 7.33 pounds
3324.4 g / 32.6 N
 strong
15 mm 833 Gs
83.3 mT
 1.23 kg / 2.71 pounds
1229.0 g / 12.1 N
 safe
20 mm 530 Gs
53.0 mT
 0.50 kg / 1.10 pounds
498.1 g / 4.9 N
 safe
30 mm 244 Gs
24.4 mT
 0.11 kg / 0.23 pounds
105.3 g / 1.0 N
 safe
50 mm 75 Gs
7.5 mT
 0.01 kg / 0.02 pounds
9.9 g / 0.1 N
 safe
Magnetic force decreases significantly with every mm of gap. Keep in mind that even the smallest gap (e.g., contamination, varnish, veneer) strongly diminishes the holding power. Magnetic products operate optimally during direct contact; gap drastically cuts the power. See how quickly the pull force plummet, when the magnet does not adhere flatly to the metal substrate. When calculating the mounting, eliminate unnecessary gaps.

Table 2: Sliding force (wall)
MPL 40x18x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
1 mm Stal (~0.2) 4.10 kg / 9.03 pounds
4096.0 g / 40.2 N
2 mm Stal (~0.2) 3.45 kg / 7.61 pounds
3450.0 g / 33.8 N
3 mm Stal (~0.2) 2.86 kg / 6.31 pounds
2860.0 g / 28.1 N
5 mm Stal (~0.2) 1.91 kg / 4.21 pounds
1910.0 g / 18.7 N
10 mm Stal (~0.2) 0.66 kg / 1.46 pounds
664.0 g / 6.5 N
15 mm Stal (~0.2) 0.25 kg / 0.54 pounds
246.0 g / 2.4 N
20 mm Stal (~0.2) 0.10 kg / 0.22 pounds
100.0 g / 1.0 N
30 mm Stal (~0.2) 0.02 kg / 0.05 pounds
22.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The table below defines the theoretical shear load needed to start the shifting of the magnet downwards along a upright steel plate (considering standard friction coefficient). This value varies with the gap size between the magnet and the metal.

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 pounds
7143.0 g / 70.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
4.76 kg / 10.50 pounds
4762.0 g / 46.7 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
2.38 kg / 5.25 pounds
2381.0 g / 23.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
11.91 kg / 26.25 pounds
11905.0 g / 116.8 N
When placing a holder on a vertical surface (e.g., a fridge), it you can count on only about 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that holders slip easier than they pull off. Want to create a wall mount? Note that the sliding force is significantly lower than the perpendicular breakaway force. On a smooth steel, the element will slip down under a much lighter weight. Application of an anti-slip pad can effectively raise the stability.

Table 4: Steel thickness (saturation) - 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 pounds
1190.5 g / 11.7 N
1 mm
13%
 2.98 kg / 6.56 pounds
2976.3 g / 29.2 N
2 mm
25%
 5.95 kg / 13.12 pounds
5952.5 g / 58.4 N
3 mm
38%
 8.93 kg / 19.68 pounds
8928.7 g / 87.6 N
5 mm
63%
 14.88 kg / 32.81 pounds
14881.3 g / 146.0 N
10 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
11 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
12 mm
100%
 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
A thin sheet is not enough to take in the entire magnetic field, which weakens actual performance of the magnet. Should you attach a powerful product to a too thin substrate, the magnetism will pass right through and the pull force will drop sharply. To utilize full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The material oversaturation means that on sheet metal structures (e.g., car bodies), the magnet works worse. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MPL 40x18x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 23.81 kg / 52.49 pounds
23810.0 g / 233.6 N
 OK
40 °C -2.2% 23.29 kg / 51.34 pounds
23286.2 g / 228.4 N
 OK
60 °C -4.4% 22.76 kg / 50.18 pounds
22762.4 g / 223.3 N
80 °C -6.6% 22.24 kg / 49.03 pounds
22238.5 g / 218.2 N
100 °C -28.8% 16.95 kg / 37.37 pounds
16952.7 g / 166.3 N
Classic neodymiums irreversibly lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly damage this magnet. With increasing heat, the magnet's force temporarily decreases. Refrain from using this product near heat sources higher than its working range. Too high temperature will result in permanent loss of magnetic properties.
*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Red status in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
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 pounds
5 034 Gs
8.95 kg / 19.72 pounds
8947 g / 87.8 N
 N/A
1 mm 55.50 kg / 122.35 pounds
7 072 Gs
8.32 kg / 18.35 pounds
8325 g / 81.7 N
 49.95 kg / 110.12 pounds
~0 Gs
2 mm 51.29 kg / 113.08 pounds
6 799 Gs
7.69 kg / 16.96 pounds
7694 g / 75.5 N
 46.16 kg / 101.77 pounds
~0 Gs
3 mm 47.18 kg / 104.01 pounds
6 520 Gs
7.08 kg / 15.60 pounds
7076 g / 69.4 N
 42.46 kg / 93.61 pounds
~0 Gs
5 mm 39.41 kg / 86.88 pounds
5 959 Gs
5.91 kg / 13.03 pounds
5912 g / 58.0 N
 35.47 kg / 78.20 pounds
~0 Gs
10 mm 23.92 kg / 52.73 pounds
4 643 Gs
3.59 kg / 7.91 pounds
3588 g / 35.2 N
 21.53 kg / 47.46 pounds
~0 Gs
20 mm 8.33 kg / 18.36 pounds
2 739 Gs
1.25 kg / 2.75 pounds
1249 g / 12.3 N
 7.49 kg / 16.52 pounds
~0 Gs
50 mm 0.55 kg / 1.22 pounds
705 Gs
0.08 kg / 0.18 pounds
83 g / 0.8 N
 0.50 kg / 1.09 pounds
~0 Gs
60 mm 0.26 kg / 0.58 pounds
487 Gs
0.04 kg / 0.09 pounds
40 g / 0.4 N
 0.24 kg / 0.52 pounds
~0 Gs
70 mm 0.13 kg / 0.30 pounds
348 Gs
0.02 kg / 0.04 pounds
20 g / 0.2 N
 0.12 kg / 0.27 pounds
~0 Gs
80 mm 0.07 kg / 0.16 pounds
256 Gs
0.01 kg / 0.02 pounds
11 g / 0.1 N
 0.07 kg / 0.14 pounds
~0 Gs
90 mm 0.04 kg / 0.09 pounds
194 Gs
0.01 kg / 0.01 pounds
6 g / 0.1 N
 0.04 kg / 0.08 pounds
~0 Gs
100 mm 0.02 kg / 0.05 pounds
149 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
Two magnets interact from a wider radius than a neodymium and metal combination. The connection of two magnets creates a more powerful interaction and a larger range of action. Designing a powerful holder? Apply two magnets instead of one magnet and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is massive. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction for N-N configuration is approximately ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Attention: Figures refer to shear force of dual same magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - 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
Car key 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
Powerful magnet radiation poses a real danger to IT equipment as well as medical implants. These magnets produce a flux that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. The risk also applies to: mechanical watches, car keys, membranes, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
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
NdFeB products are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can cause material chips or injury to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the magnet. Wear safety glasses when working with large magnets.

Table 9: Coating parameters (durability)
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)
The following table defines the conditions under which this product can be safely used. Note the thickness of the protective layer.

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

Parameter Value SI Unit / Description
Magnetic Flux 26 060 Mx 260.6 µWb
Pc Coefficient 0.43 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers as well as sensors. Pc value defines the working geometry.

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
Contrary to myths, water does not block the magnetic field. Buoyancy helps in lifting finds.
1. Vertical hold

*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 material, the safety 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.

Technical specification and ecology
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
Quick 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 magnetic 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 secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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 hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 40x18x10 / N38, it is best to use two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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).
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), 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.

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

Besides their durability, neodymium magnets are valued for these benefits:
  • They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (in laboratory conditions),
  • They maintain their magnetic properties even under close interference source,
  • A magnet with a metallic gold surface is more attractive,
  • Magnetic induction on the working part of the magnet remains maximum,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the ability of free molding and customization to unique projects, magnetic components can be produced in a broad palette of geometric configurations, which increases their versatility,
  • Universal use in high-tech industry – they serve a role in mass storage devices, electric motors, precision medical tools, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in compact constructions

Weaknesses

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in producing threads and complex shapes in magnets, we propose using cover - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these products are able to be problematic in diagnostics medical after entering the body.
  • Due to neodymium price, their price exceeds standard values,

Holding force characteristics

Magnetic strength at its maximum – what affects it?

The force parameter is a measurement result performed under specific, ideal conditions:
  • using a plate made of low-carbon steel, functioning as a magnetic yoke
  • with a cross-section of at least 10 mm
  • with a surface free of scratches
  • under conditions of ideal adhesion (surface-to-surface)
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

Key elements affecting lifting force

It is worth knowing that the working load may be lower depending on elements below, in order of importance:
  • Gap (betwixt the magnet and the metal), because even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the holding force.

Precautions when working with neodymium magnets
Threat to navigation

Be aware: rare earth magnets produce a field that interferes with precision electronics. Maintain a separation from your phone, device, and GPS.

Threat to electronics

Equipment safety: Strong magnets can damage payment cards and delicate electronics (pacemakers, hearing aids, timepieces).

Magnets are brittle

Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Physical harm

Watch your fingers. Two large magnets will join instantly with a force of massive weight, destroying everything in their path. Be careful!

Fire warning

Powder produced during machining of magnets is flammable. Do not drill into magnets without proper cooling and knowledge.

Nickel coating and allergies

Warning for allergy sufferers: The Ni-Cu-Ni coating consists of nickel. If redness happens, cease handling magnets and wear gloves.

Life threat

People with a ICD should maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and pulling force.

Do not give to children

Absolutely store magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are very dangerous.

Safe operation

Use magnets with awareness. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.

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