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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

technical specifications »

12.24 ZŁ with VAT / pcs + price for transport

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Technical specification - 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 modeling of the assembly - technical parameters

The following data are the outcome of a physical simulation. Values were calculated on models for the material Nd2Fe14B. Real-world performance may deviate from the simulation results. Use these data as a reference point for designers.

Table 1: Static force (pull vs gap) - characteristics
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 lbs
10670.0 g / 104.7 N
 crushing
1 mm 1956 Gs
195.6 mT
 9.69 kg / 21.37 lbs
9693.2 g / 95.1 N
 strong
2 mm 1839 Gs
183.9 mT
 8.57 kg / 18.89 lbs
8570.5 g / 84.1 N
 strong
3 mm 1711 Gs
171.1 mT
 7.41 kg / 16.34 lbs
7413.1 g / 72.7 N
 strong
5 mm 1444 Gs
144.4 mT
 5.28 kg / 11.65 lbs
5282.9 g / 51.8 N
 strong
10 mm 888 Gs
88.8 mT
 2.00 kg / 4.40 lbs
1996.5 g / 19.6 N
 safe
15 mm 545 Gs
54.5 mT
 0.75 kg / 1.66 lbs
752.0 g / 7.4 N
 safe
20 mm 346 Gs
34.6 mT
 0.30 kg / 0.67 lbs
302.9 g / 3.0 N
 safe
30 mm 156 Gs
15.6 mT
 0.06 kg / 0.14 lbs
61.9 g / 0.6 N
 safe
50 mm 46 Gs
4.6 mT
 0.01 kg / 0.01 lbs
5.4 g / 0.1 N
 safe
Grip strength decreases drastically with every subsequent millimeter of gap. Note that every additional insulation layer (e.g., contamination, paint, veneer) noticeably weakens the grip. Magnetic products operate optimally at the point of direct contact; gap drastically cuts the power. See how rapidly the load capacity fall, when the magnet does not touch tightly to the steel surface. When planning the arrangement, discard unnecessary gaps.

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.13 kg / 4.70 lbs
2134.0 g / 20.9 N
1 mm Stal (~0.2) 1.94 kg / 4.27 lbs
1938.0 g / 19.0 N
2 mm Stal (~0.2) 1.71 kg / 3.78 lbs
1714.0 g / 16.8 N
3 mm Stal (~0.2) 1.48 kg / 3.27 lbs
1482.0 g / 14.5 N
5 mm Stal (~0.2) 1.06 kg / 2.33 lbs
1056.0 g / 10.4 N
10 mm Stal (~0.2) 0.40 kg / 0.88 lbs
400.0 g / 3.9 N
15 mm Stal (~0.2) 0.15 kg / 0.33 lbs
150.0 g / 1.5 N
20 mm Stal (~0.2) 0.06 kg / 0.13 lbs
60.0 g / 0.6 N
30 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N
This section indicates the approximate holding capacity required to cause the sliding of the magnet down on a vertical steel wall (considering standard friction coefficient). The holding force depends on the air gap between the magnet and the metal.

Table 3: Wall mounting (shearing) - 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 lbs
3201.0 g / 31.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.13 kg / 4.70 lbs
2134.0 g / 20.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.07 kg / 2.35 lbs
1067.0 g / 10.5 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
5.34 kg / 11.76 lbs
5335.0 g / 52.3 N
When mounting a element on a vertical plane (e.g., a car body), it will maintain only approx. 20%-30% of its maximum pull force. Gravitational force and a low friction coefficient influence the fact that magnets slide down faster than they pop off the substrate. Want to create a wall mount? Consider that the sliding force is much weaker than the maximum static pull force. On a painted metal, the holder will slip down under a significantly smaller weight. Utilizing a rubberized layer can drastically improve the result.

Table 4: Material efficiency (substrate influence) - 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 lbs
533.5 g / 5.2 N
1 mm
13%
 1.33 kg / 2.94 lbs
1333.8 g / 13.1 N
2 mm
25%
 2.67 kg / 5.88 lbs
2667.5 g / 26.2 N
3 mm
38%
 4.00 kg / 8.82 lbs
4001.2 g / 39.3 N
5 mm
63%
 6.67 kg / 14.70 lbs
6668.8 g / 65.4 N
10 mm
100%
 10.67 kg / 23.52 lbs
10670.0 g / 104.7 N
11 mm
100%
 10.67 kg / 23.52 lbs
10670.0 g / 104.7 N
12 mm
100%
 10.67 kg / 23.52 lbs
10670.0 g / 104.7 N
A thin metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. If you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To utilize full efficiency of this magnet's power, you need a suitably thick backing of metal. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 10.67 kg / 23.52 lbs
10670.0 g / 104.7 N
 OK
40 °C -2.2% 10.44 kg / 23.01 lbs
10435.3 g / 102.4 N
 OK
60 °C -4.4% 10.20 kg / 22.49 lbs
10200.5 g / 100.1 N
80 °C -6.6% 9.97 kg / 21.97 lbs
9965.8 g / 97.8 N
100 °C -28.8% 7.60 kg / 16.75 lbs
7597.0 g / 74.5 N
Classic neodymiums irreversibly lose power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently damage this product. With every degree above norm, the magnet's force temporarily lowers. Do not use this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will result in destruction of magnetic properties.
*Technical advisory: Heat tolerance depends not only on the material grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress compared to rod magnets. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (attraction) - field collision
MPL 40x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 20.78 kg / 45.80 lbs
3 495 Gs
3.12 kg / 6.87 lbs
3116 g / 30.6 N
 N/A
1 mm 19.88 kg / 43.83 lbs
4 015 Gs
2.98 kg / 6.57 lbs
2982 g / 29.3 N
 17.89 kg / 39.44 lbs
~0 Gs
2 mm 18.87 kg / 41.61 lbs
3 912 Gs
2.83 kg / 6.24 lbs
2831 g / 27.8 N
 16.99 kg / 37.45 lbs
~0 Gs
3 mm 17.80 kg / 39.24 lbs
3 800 Gs
2.67 kg / 5.89 lbs
2670 g / 26.2 N
 16.02 kg / 35.32 lbs
~0 Gs
5 mm 15.56 kg / 34.30 lbs
3 552 Gs
2.33 kg / 5.14 lbs
2334 g / 22.9 N
 14.00 kg / 30.87 lbs
~0 Gs
10 mm 10.29 kg / 22.68 lbs
2 888 Gs
1.54 kg / 3.40 lbs
1543 g / 15.1 N
 9.26 kg / 20.41 lbs
~0 Gs
20 mm 3.89 kg / 8.57 lbs
1 776 Gs
0.58 kg / 1.29 lbs
583 g / 5.7 N
 3.50 kg / 7.71 lbs
~0 Gs
50 mm 0.26 kg / 0.57 lbs
456 Gs
0.04 kg / 0.08 lbs
39 g / 0.4 N
 0.23 kg / 0.51 lbs
~0 Gs
60 mm 0.12 kg / 0.27 lbs
313 Gs
0.02 kg / 0.04 lbs
18 g / 0.2 N
 0.11 kg / 0.24 lbs
~0 Gs
70 mm 0.06 kg / 0.13 lbs
221 Gs
0.01 kg / 0.02 lbs
9 g / 0.1 N
 0.05 kg / 0.12 lbs
~0 Gs
80 mm 0.03 kg / 0.07 lbs
162 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
 0.03 kg / 0.06 lbs
~0 Gs
90 mm 0.02 kg / 0.04 lbs
121 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
 0.02 kg / 0.04 lbs
~0 Gs
100 mm 0.01 kg / 0.02 lbs
93 Gs
0.00 kg / 0.00 lbs
2 g / 0.0 N
 0.01 kg / 0.02 lbs
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet combination. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Want to build a solid fastener? Use a pair of magnets instead of one magnet and a steel. Be careful that when bringing together two magnets, the collision energy is extreme. The levitation is marginally weaker than the connection force, but still significant.
*The magnetic induction for N-N configuration drops to ~0 Gs in the exact middle between the magnets (due to field cancellation).
Note: Figures demonstrate shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (electronics) - precautionary measures
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
Mobile device 40 Gs (4.0 mT) 5.5 cm
Remote 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
A strong magnetic field is a serious hazard to electronics and medical implants. These neodymiums generate a field that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and plastic. Special caution must be taken by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - 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 risks their cracking. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to skin. Be sure to control the product 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 neodymium. Wear safety glasses when working with large magnets.

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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Pc)
MPL 40x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 18 042 Mx 180.4 µWb
Pc Coefficient 0.23 Low (Flat)
Flux value passing through the magnet pole. Key data when building generators as well as sensors. Pc value defines 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%
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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Sliding resistance

*Note: On a vertical surface, the magnet retains just a fraction of its nominal pull.

2. Steel saturation

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

3. Thermal stability

*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.

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%
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: 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 premium class connection. As a block magnet with high power (approx. 10.67 kg), this product is available immediately from our warehouse in Poland. 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 40x20x5 / 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. 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. Thanks to the flat surface and high force (approx. 10.67 kg), they are ideal as hidden locks 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.
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 40x20x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. In practice, this means that this magnet has the greatest attraction force on its main planes (40x20 mm), which is ideal for flat mounting. 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), 20 mm (width), and 5 mm (thickness). It is a magnetic block with dimensions 40x20x5 mm and a self-weight of 30 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Strengths

Apart from their consistent power, neodymium magnets have these key benefits:
  • They retain full power for around 10 years – the drop is just ~1% (based on simulations),
  • They retain their magnetic properties even under strong external field,
  • By using a shiny coating of nickel, the element acquires an proper look,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Possibility of detailed shaping as well as optimizing to specific needs,
  • Wide application in electronics industry – they are utilized in data components, electric motors, diagnostic systems, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in miniature devices

Disadvantages

Disadvantages of NdFeB magnets:
  • At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing threads in the magnet and complicated shapes - preferred is cover - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these magnets can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Highest magnetic holding force – what contributes to it?

The declared magnet strength concerns the maximum value, measured under optimal environment, specifically:
  • on a plate made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension reaches at least 10 mm
  • characterized by lack of roughness
  • without any insulating layer between the magnet and steel
  • during detachment in a direction vertical to the plane
  • at room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, such as (from priority):
  • Gap between magnet and steel – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of generating force.
  • Metal type – different alloys reacts the same. Alloy additives weaken the attraction effect.
  • Base smoothness – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost gain strength (up to a certain limit).

Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

Safe handling of NdFeB magnets
Safe operation

Handle magnets consciously. Their powerful strength can shock even professionals. Plan your moves and do not underestimate their power.

Nickel allergy

Certain individuals suffer from a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause a rash. We strongly advise use safety gloves.

Heat warning

Avoid heat. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, ask us about HT versions (H, SH, UH).

ICD Warning

For implant holders: Powerful magnets affect electronics. Keep minimum 30 cm distance or request help to handle the magnets.

Bone fractures

Risk of injury: The attraction force is so great that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Risk of cracking

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. We recommend safety glasses.

Flammability

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Keep away from children

Absolutely keep magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are life-threatening.

GPS and phone interference

Note: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and navigation systems.

Keep away from computers

Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, mechanical watches).

Warning! Need more info? Check our post: Are neodymium magnets dangerous?