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MPL 40x5x3 / N38 - lamellar magnet

lamellar magnet

Catalog no 020402

GTIN/EAN: 5906301811916

length

40 mm [±0,1 mm]

Width

5 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

4.5 g

Magnetization Direction

↑ axial

Load capacity

7.33 kg / 71.91 N

Magnetic Induction

348.83 mT / 3488 Gs

Coating

[NiCuNi] Nickel

view technical specifications »

6.65 ZŁ with VAT / pcs + price for transport

5.41 ZŁ net + 23% VAT / pcs

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Strength along with shape of a magnet can be analyzed on our force calculator.

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Physical properties - MPL 40x5x3 / N38 - lamellar magnet

Specification / characteristics - MPL 40x5x3 / N38 - lamellar magnet

properties
properties values
Cat. no. 020402
GTIN/EAN 5906301811916
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 5 mm [±0,1 mm]
Height 3 mm [±0,1 mm]
Weight 4.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.33 kg / 71.91 N
Magnetic Induction ~ ? 348.83 mT / 3488 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x5x3 / 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 assembly - data

The following data are the outcome of a mathematical simulation. Results were calculated on models for the class Nd2Fe14B. Actual parameters might slightly differ from theoretical values. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static pull force (force vs distance) - characteristics
MPL 40x5x3 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3485 Gs
348.5 mT
 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
 medium risk
1 mm 2529 Gs
252.9 mT
 3.86 kg / 8.51 LBS
3859.9 g / 37.9 N
 medium risk
2 mm 1741 Gs
174.1 mT
 1.83 kg / 4.03 LBS
1829.7 g / 17.9 N
 safe
3 mm 1217 Gs
121.7 mT
 0.89 kg / 1.97 LBS
893.7 g / 8.8 N
 safe
5 mm 664 Gs
66.4 mT
 0.27 kg / 0.59 LBS
265.9 g / 2.6 N
 safe
10 mm 235 Gs
23.5 mT
 0.03 kg / 0.07 LBS
33.5 g / 0.3 N
 safe
15 mm 116 Gs
11.6 mT
 0.01 kg / 0.02 LBS
8.2 g / 0.1 N
 safe
20 mm 67 Gs
6.7 mT
 0.00 kg / 0.01 LBS
2.7 g / 0.0 N
 safe
30 mm 27 Gs
2.7 mT
 0.00 kg / 0.00 LBS
0.5 g / 0.0 N
 safe
50 mm 8 Gs
0.8 mT
 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
 safe
Magnetic force drops sharply with every mm of gap. Remember that even a very thin break (e.g., dirt, paint, dust) significantly weakens the grip. Magnetic products hold optimally in perfect adhesion; distance weakens the power. Analyze how quickly the pull force drop, when the magnet does not adhere flatly to the steel surface. When calculating the mounting, discard unnecessary gaps.

Table 2: Slippage capacity (wall)
MPL 40x5x3 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.47 kg / 3.23 LBS
1466.0 g / 14.4 N
1 mm Stal (~0.2) 0.77 kg / 1.70 LBS
772.0 g / 7.6 N
2 mm Stal (~0.2) 0.37 kg / 0.81 LBS
366.0 g / 3.6 N
3 mm Stal (~0.2) 0.18 kg / 0.39 LBS
178.0 g / 1.7 N
5 mm Stal (~0.2) 0.05 kg / 0.12 LBS
54.0 g / 0.5 N
10 mm Stal (~0.2) 0.01 kg / 0.01 LBS
6.0 g / 0.1 N
15 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
20 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
30 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
0.0 g / 0.0 N
The table below shows the theoretical force needed to start the slippage of the magnet downwards along a vertical steel wall (considering typical friction coefficient). The holding force varies with the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x5x3 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.20 kg / 4.85 LBS
2199.0 g / 21.6 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.47 kg / 3.23 LBS
1466.0 g / 14.4 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.73 kg / 1.62 LBS
733.0 g / 7.2 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.67 kg / 8.08 LBS
3665.0 g / 36.0 N
When placing a magnet on a vertical plane (e.g., a car body), it will only hold barely about 20%-30% of nominal attraction strength. Gravity as well as a weak degree of grip cause that holders move down faster than they pop off the substrate. Want to create a wall mount? Note that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller weight. Using a rubber layer can significantly raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x5x3 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.73 kg / 1.62 LBS
733.0 g / 7.2 N
1 mm
25%
 1.83 kg / 4.04 LBS
1832.5 g / 18.0 N
2 mm
50%
 3.67 kg / 8.08 LBS
3665.0 g / 36.0 N
3 mm
75%
 5.50 kg / 12.12 LBS
5497.5 g / 53.9 N
5 mm
100%
 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
10 mm
100%
 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
11 mm
100%
 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
12 mm
100%
 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
A thin sheet is unable to take in the full magnetic flux, which squanders power of the holder. Should you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To squeeze full efficiency of this neodymium's potential, you require a sufficiently solid piece of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the product holds weaker. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 40x5x3 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.33 kg / 16.16 LBS
7330.0 g / 71.9 N
 OK
40 °C -2.2% 7.17 kg / 15.80 LBS
7168.7 g / 70.3 N
 OK
60 °C -4.4% 7.01 kg / 15.45 LBS
7007.5 g / 68.7 N
80 °C -6.6% 6.85 kg / 15.09 LBS
6846.2 g / 67.2 N
100 °C -28.8% 5.22 kg / 11.51 LBS
5219.0 g / 51.2 N
Ordinary NdFeB products change their properties power past the thermal threshold. Protect against heat – heat can irreversibly damage this product. With every degree above norm, the magnet's capacity briefly decreases. Do not use this magnet close to ovens higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Important note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Flat magnets (pancake types) may lose charge permanently sooner than taller cylinders. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field range
MPL 40x5x3 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 14.97 kg / 33.01 LBS
4 697 Gs
2.25 kg / 4.95 LBS
2246 g / 22.0 N
 N/A
1 mm 11.16 kg / 24.61 LBS
6 017 Gs
1.67 kg / 3.69 LBS
1674 g / 16.4 N
 10.04 kg / 22.15 LBS
~0 Gs
2 mm 7.88 kg / 17.38 LBS
5 058 Gs
1.18 kg / 2.61 LBS
1183 g / 11.6 N
 7.10 kg / 15.64 LBS
~0 Gs
3 mm 5.44 kg / 11.99 LBS
4 201 Gs
0.82 kg / 1.80 LBS
816 g / 8.0 N
 4.90 kg / 10.79 LBS
~0 Gs
5 mm 2.59 kg / 5.71 LBS
2 899 Gs
0.39 kg / 0.86 LBS
389 g / 3.8 N
 2.33 kg / 5.14 LBS
~0 Gs
10 mm 0.54 kg / 1.20 LBS
1 328 Gs
0.08 kg / 0.18 LBS
81 g / 0.8 N
 0.49 kg / 1.08 LBS
~0 Gs
20 mm 0.07 kg / 0.15 LBS
471 Gs
0.01 kg / 0.02 LBS
10 g / 0.1 N
 0.06 kg / 0.14 LBS
~0 Gs
50 mm 0.00 kg / 0.00 LBS
83 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
60 mm 0.00 kg / 0.00 LBS
55 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
70 mm 0.00 kg / 0.00 LBS
38 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
80 mm 0.00 kg / 0.00 LBS
27 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
90 mm 0.00 kg / 0.00 LBS
20 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
100 mm 0.00 kg / 0.00 LBS
15 Gs
0.00 kg / 0.00 LBS
0 g / 0.0 N
 0.00 kg / 0.00 LBS
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal setup. Such a system of two magnets produces a massive flux and a wider radius of operation. Want to build a strong closure? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The repulsion force is marginally weaker than the attraction, but still significant.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center of the gap (due to field cancellation).
Attention: Results demonstrate friction force of a pair of identical neodymium magnets (friction ~0.15 for Ni-Ni coating).

Table 7: Safety (HSE) (electronics) - warnings
MPL 40x5x3 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 6.0 cm
Hearing aid 10 Gs (1.0 mT) 4.5 cm
Mechanical watch 20 Gs (2.0 mT) 3.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 3.0 cm
Car key 50 Gs (5.0 mT) 2.5 cm
Payment card 400 Gs (40.0 mT) 1.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
Extremely neodym field is a serious hazard to electronics and pacemakers. These magnets produce a flux that prevents correct functioning of sensitive medical devices. Remember: the invisible magnetic field penetrates the body and plastic. Special caution must be exercised by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, car keys, membranes, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - warning
MPL 40x5x3 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 40.82 km/h
(11.34 m/s)
 0.29 J
30 mm 70.50 km/h
(19.58 m/s)
 0.86 J
50 mm 91.02 km/h
(25.28 m/s)
 1.44 J
100 mm 128.71 km/h
(35.75 m/s)
 2.88 J
Neodymium magnets are delicate – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or painful pinches to fingers. Hold the magnet firmly during mounting so it doesn't hit violently against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
MPL 40x5x3 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 40x5x3 / N38

Parameter Value SI Unit / Description
Magnetic Flux 5 123 Mx 51.2 µWb
Pc Coefficient 0.27 Low (Flat)
Total magnetic flux emitted by the pole surface. Essential parameter in coil applications as well as sensors. Pc value defines the working geometry.

Table 11: Hydrostatics and buoyancy
MPL 40x5x3 / N38

Environment Effective steel pull Effect
Air (land) 7.33 kg Standard
Water (riverbed) 8.39 kg
(+1.06 kg buoyancy gain)
+14.5%
Corrosion warning: 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. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its nominal pull.

2. Plate thickness effect

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits 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) = 0.27

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
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%
Ecology and recycling (GPSR)
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: 020402-2026
Magnet Unit Converter
Magnet pull force
Magnetic Induction
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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x5x3 mm and a weight of 4.5 g, guarantees premium class connection. This magnetic block with a force of 71.91 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 block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x5x3 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
They constitute a key element in the production of wind generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 40x5x3 / 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), 5 mm (width), and 3 mm (thickness). The key parameter here is the holding force amounting to approximately 7.33 kg (force ~71.91 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 rare earth magnets.

Benefits

Besides their exceptional strength, neodymium magnets offer the following advantages:
  • They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets prove to be extremely resistant to loss of magnetic properties caused by external interference,
  • A magnet with a shiny nickel surface is more attractive,
  • Magnets possess maximum magnetic induction on the surface,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of precise creating as well as optimizing to concrete needs,
  • Versatile presence in modern technologies – they find application in hard drives, motor assemblies, diagnostic systems, and technologically advanced constructions.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Limited possibility of making threads in the magnet and complicated shapes - recommended is a housing - mounting mechanism.
  • Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small elements of these products can disrupt the diagnostic process medical in case of swallowing.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Highest magnetic holding force – what affects it?

The load parameter shown refers to the peak performance, recorded under ideal test conditions, meaning:
  • with the contact of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • whose thickness reaches at least 10 mm
  • with a plane cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):
  • Gap between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a slight gap between the magnet and the plate reduces the holding force.

Precautions when working with NdFeB magnets
Dust explosion hazard

Powder created during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Conscious usage

Handle magnets with awareness. Their immense force can surprise even professionals. Be vigilant and respect their force.

Data carriers

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Physical harm

Big blocks can crush fingers in a fraction of a second. Never place your hand betwixt two strong magnets.

Precision electronics

GPS units and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Health Danger

For implant holders: Powerful magnets disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.

Metal Allergy

A percentage of the population suffer from a contact allergy to Ni, which is the typical protective layer for NdFeB magnets. Extended handling may cause a rash. We suggest use safety gloves.

Magnets are brittle

Despite metallic appearance, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Operating temperature

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.

This is not a toy

Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them connecting inside the digestive tract, which poses a direct threat to life and requires urgent medical intervention.

Danger! More info about risks in the article: Magnet Safety Guide.