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MPL 40x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020160

GTIN/EAN: 5906301811664

5.00

length

40 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

30 g

Magnetization Direction

↑ axial

Load capacity

10.67 kg / 104.63 N

Magnetic Induction

205.27 mT / 2053 Gs

Coating

[NiCuNi] Nickel

see technical specifications »

12.24 ZŁ with VAT / pcs + price for transport

9.95 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 40x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 40x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020160
GTIN/EAN 5906301811664
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 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 30 g
Magnetization Direction ↑ axial
Load capacity ~ ? 10.67 kg / 104.63 N
Magnetic Induction ~ ? 205.27 mT / 2053 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x20x5 / 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 analysis of the assembly - data

Presented data constitute the direct effect of a physical simulation. Values rely on models for the material Nd2Fe14B. Real-world conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static pull force (force vs gap) - interaction chart
MPL 40x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2052 Gs
205.2 mT
 10.67 kg / 23.52 pounds
10670.0 g / 104.7 N
 dangerous!
1 mm 1956 Gs
195.6 mT
 9.69 kg / 21.37 pounds
9693.2 g / 95.1 N
 warning
2 mm 1839 Gs
183.9 mT
 8.57 kg / 18.89 pounds
8570.5 g / 84.1 N
 warning
3 mm 1711 Gs
171.1 mT
 7.41 kg / 16.34 pounds
7413.1 g / 72.7 N
 warning
5 mm 1444 Gs
144.4 mT
 5.28 kg / 11.65 pounds
5282.9 g / 51.8 N
 warning
10 mm 888 Gs
88.8 mT
 2.00 kg / 4.40 pounds
1996.5 g / 19.6 N
 safe
15 mm 545 Gs
54.5 mT
 0.75 kg / 1.66 pounds
752.0 g / 7.4 N
 safe
20 mm 346 Gs
34.6 mT
 0.30 kg / 0.67 pounds
302.9 g / 3.0 N
 safe
30 mm 156 Gs
15.6 mT
 0.06 kg / 0.14 pounds
61.9 g / 0.6 N
 safe
50 mm 46 Gs
4.6 mT
 0.01 kg / 0.01 pounds
5.4 g / 0.1 N
 safe
Grip strength decreases sharply with every subsequent millimeter of spacing. Note that even the smallest gap (e.g., dirt, varnish, dust) significantly weakens the grip. Magnets operate strongest during direct contact; gap kills the force. Analyze how rapidly the pull force drop, when the magnet does not touch flatly to the metal substrate. When planning the assembly, avoid additional spacers.

Table 2: Shear force (wall)
MPL 40x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.13 kg / 4.70 pounds
2134.0 g / 20.9 N
1 mm Stal (~0.2) 1.94 kg / 4.27 pounds
1938.0 g / 19.0 N
2 mm Stal (~0.2) 1.71 kg / 3.78 pounds
1714.0 g / 16.8 N
3 mm Stal (~0.2) 1.48 kg / 3.27 pounds
1482.0 g / 14.5 N
5 mm Stal (~0.2) 1.06 kg / 2.33 pounds
1056.0 g / 10.4 N
10 mm Stal (~0.2) 0.40 kg / 0.88 pounds
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.15 kg / 0.33 pounds
150.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 pounds
60.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
The following data indicates the theoretical holding capacity necessary to start the slippage of the magnet downwards against a upright metal surface (assuming typical friction coefficient). This parameter varies with the separation distance between the magnet and the surface.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 40x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.20 kg / 7.06 pounds
3201.0 g / 31.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.13 kg / 4.70 pounds
2134.0 g / 20.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.07 kg / 2.35 pounds
1067.0 g / 10.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.34 kg / 11.76 pounds
5335.0 g / 52.3 N
When placing a magnet on a upright wall (e.g., a fridge), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravity and a weak degree of grip cause that holders slide down easier than they detach. Designing a vertical fastening? Remember that the sliding force is noticeably lower than the perpendicular breakaway force. On a smooth steel, the element will give way down under a noticeably lighter weight. Using a rubber pad can effectively increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 40x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.53 kg / 1.18 pounds
533.5 g / 5.2 N
1 mm
13%
 1.33 kg / 2.94 pounds
1333.8 g / 13.1 N
2 mm
25%
 2.67 kg / 5.88 pounds
2667.5 g / 26.2 N
3 mm
38%
 4.00 kg / 8.82 pounds
4001.2 g / 39.3 N
5 mm
63%
 6.67 kg / 14.70 pounds
6668.8 g / 65.4 N
10 mm
100%
 10.67 kg / 23.52 pounds
10670.0 g / 104.7 N
11 mm
100%
 10.67 kg / 23.52 pounds
10670.0 g / 104.7 N
12 mm
100%
 10.67 kg / 23.52 pounds
10670.0 g / 104.7 N
A thin sheet cannot take in the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the flux will pass right through and the holding will be smaller. To utilize the maximum of this neodymium's potential, you require a sufficiently solid element of metal. The saturation effect means that on thin elements (e.g., appliance housings), the product shows lower pull force. We advise picking the steel thickness based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 40x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.67 kg / 23.52 pounds
10670.0 g / 104.7 N
 OK
40 °C -2.2% 10.44 kg / 23.01 pounds
10435.3 g / 102.4 N
 OK
60 °C -4.4% 10.20 kg / 22.49 pounds
10200.5 g / 100.1 N
80 °C -6.6% 9.97 kg / 21.97 pounds
9965.8 g / 97.8 N
100 °C -28.8% 7.60 kg / 16.75 pounds
7597.0 g / 74.5 N
Ordinary NdFeB products change their properties strength past the thermal threshold. Protect against heat – heat can irreversibly destroy this product. As the temperature rises, the magnet's power momentarily decreases. Do not use this product close to ovens higher than its safe range. Too high temperature will cause destruction of magnetic properties.
*Technical advisory: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) risk losing magnetic properties sooner compared to rod magnets. The danger warning in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 40x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.78 kg / 45.80 pounds
3 495 Gs
3.12 kg / 6.87 pounds
3116 g / 30.6 N
 N/A
1 mm 19.88 kg / 43.83 pounds
4 015 Gs
2.98 kg / 6.57 pounds
2982 g / 29.3 N
 17.89 kg / 39.44 pounds
~0 Gs
2 mm 18.87 kg / 41.61 pounds
3 912 Gs
2.83 kg / 6.24 pounds
2831 g / 27.8 N
 16.99 kg / 37.45 pounds
~0 Gs
3 mm 17.80 kg / 39.24 pounds
3 800 Gs
2.67 kg / 5.89 pounds
2670 g / 26.2 N
 16.02 kg / 35.32 pounds
~0 Gs
5 mm 15.56 kg / 34.30 pounds
3 552 Gs
2.33 kg / 5.14 pounds
2334 g / 22.9 N
 14.00 kg / 30.87 pounds
~0 Gs
10 mm 10.29 kg / 22.68 pounds
2 888 Gs
1.54 kg / 3.40 pounds
1543 g / 15.1 N
 9.26 kg / 20.41 pounds
~0 Gs
20 mm 3.89 kg / 8.57 pounds
1 776 Gs
0.58 kg / 1.29 pounds
583 g / 5.7 N
 3.50 kg / 7.71 pounds
~0 Gs
50 mm 0.26 kg / 0.57 pounds
456 Gs
0.04 kg / 0.08 pounds
39 g / 0.4 N
 0.23 kg / 0.51 pounds
~0 Gs
60 mm 0.12 kg / 0.27 pounds
313 Gs
0.02 kg / 0.04 pounds
18 g / 0.2 N
 0.11 kg / 0.24 pounds
~0 Gs
70 mm 0.06 kg / 0.13 pounds
221 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
 0.05 kg / 0.12 pounds
~0 Gs
80 mm 0.03 kg / 0.07 pounds
162 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
 0.03 kg / 0.06 pounds
~0 Gs
90 mm 0.02 kg / 0.04 pounds
121 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
 0.02 kg / 0.04 pounds
~0 Gs
100 mm 0.01 kg / 0.02 pounds
93 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
Two magnetic products attract each other from a much further distance than a magnet and steel combination. Such a system of two magnets produces a massive flux and a further horizon of operation. Want to build a strong closure? Apply two magnets instead of one magnet and a striker plate. Remember that when bringing together two magnets, the pinch force is huge. The levitation is slightly lower than the attraction, but still large.
*Field value for N-N configuration is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Figures apply to sliding force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (electronics) - warnings
MPL 40x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 11.5 cm
Hearing aid 10 Gs (1.0 mT) 9.0 cm
Mechanical watch 20 Gs (2.0 mT) 7.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 5.5 cm
Car key 50 Gs (5.0 mT) 5.0 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 is a serious hazard to electronic devices as well as medical implants. These magnets generate a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MPL 40x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.13 km/h
(5.87 m/s)
 0.52 J
30 mm 33.06 km/h
(9.18 m/s)
 1.27 J
50 mm 42.54 km/h
(11.82 m/s)
 2.09 J
100 mm 60.15 km/h
(16.71 m/s)
 4.19 J
NdFeB products are delicate – a violent impact against metal can result in shattering. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or dangerous crushing to skin. Always hold the magnet during installation so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the neodymium. Wear eye protection when working with powerful specimens.

Table 9: Anti-corrosion coating durability
MPL 40x20x5 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 40x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 042 Mx 180.4 µWb
Pc Coefficient 0.23 Low (Flat)
Flux value emitted by the magnet pole. Key data in coil applications and motors. Pc value determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
MPL 40x20x5 / N38

Environment Effective steel pull Effect
Air (land) 10.67 kg Standard
Water (riverbed) 12.22 kg
(+1.55 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.
In water, the magnet feels stronger thanks to Archimedes' principle. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Wall mount (shear)

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

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) drastically limits the holding force.

3. Heat tolerance

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23

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 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%
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: 020160-2026
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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 40x20x5 mm and a weight of 30 g, guarantees the highest quality connection. As a block magnet with high power (approx. 10.67 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
The key to success is sliding 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. To separate the MPL 40x20x5 / 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. 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 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.
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.
This model is characterized by dimensions 40x20x5 mm, which, at a weight of 30 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 10.67 kg (force ~104.63 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Pros

Besides their durability, neodymium magnets are valued for these benefits:
  • Their power is maintained, and after approximately 10 years it decreases only by ~1% (according to research),
  • They are resistant to demagnetization induced by presence of other magnetic fields,
  • A magnet with a shiny nickel surface looks better,
  • Magnets possess very high magnetic induction on the working surface,
  • 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 modularity in forming and the capacity to adapt to unusual requirements,
  • Fundamental importance in modern industrial fields – they serve a role in magnetic memories, brushless drives, medical devices, and modern systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in compact constructions

Limitations

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in realizing threads and complicated forms in magnets, we recommend using cover - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets can be a barrier,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what affects it?

Breakaway force was determined for optimal configuration, including:
  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • possessing a thickness of at least 10 mm to avoid saturation
  • characterized by lack of roughness
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at room temperature

Key elements affecting lifting force

It is worth knowing that the magnet holding may be lower influenced by the following factors, starting with the most relevant:
  • Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
  • Plate thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be escaped into the air.
  • Material type – the best choice is pure iron steel. Cast iron may generate lower lifting capacity.
  • Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under parallel forces the holding force is lower. Moreover, even a slight gap between the magnet and the plate decreases the holding force.

H&S for magnets
Cards and drives

Very strong magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Choking Hazard

Adult use only. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of kids and pets.

Keep away from electronics

A strong magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Maintain magnets close to a device to avoid damaging the sensors.

Fire risk

Powder produced during machining of magnets is flammable. Avoid drilling into magnets without proper cooling and knowledge.

Material brittleness

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

Caution required

Handle magnets consciously. Their immense force can shock even experienced users. Plan your moves and do not underestimate their force.

Life threat

Patients with a pacemaker have to maintain an absolute distance from magnets. The magnetic field can stop the functioning of the implant.

Allergic reactions

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, immediately stop working with magnets and use protective gear.

Heat sensitivity

Avoid heat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Finger safety

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

Danger! Need more info? Read our article: Are neodymium magnets dangerous?