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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 parameters »

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Technical details - 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 magnet - technical parameters

Presented data constitute the direct effect of a engineering calculation. Results rely on models for the class Nd2Fe14B. Actual performance may differ. Treat these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs gap) - power drop
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
 crushing
1 mm 1956 Gs
195.6 mT
 9.69 kg / 21.37 pounds
9693.2 g / 95.1 N
 medium risk
2 mm 1839 Gs
183.9 mT
 8.57 kg / 18.89 pounds
8570.5 g / 84.1 N
 medium risk
3 mm 1711 Gs
171.1 mT
 7.41 kg / 16.34 pounds
7413.1 g / 72.7 N
 medium risk
5 mm 1444 Gs
144.4 mT
 5.28 kg / 11.65 pounds
5282.9 g / 51.8 N
 medium risk
10 mm 888 Gs
88.8 mT
 2.00 kg / 4.40 pounds
1996.5 g / 19.6 N
 low risk
15 mm 545 Gs
54.5 mT
 0.75 kg / 1.66 pounds
752.0 g / 7.4 N
 low risk
20 mm 346 Gs
34.6 mT
 0.30 kg / 0.67 pounds
302.9 g / 3.0 N
 low risk
30 mm 156 Gs
15.6 mT
 0.06 kg / 0.14 pounds
61.9 g / 0.6 N
 low risk
50 mm 46 Gs
4.6 mT
 0.01 kg / 0.01 pounds
5.4 g / 0.1 N
 low risk
Pulling power weakens drastically with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., dirt, paint, rust) noticeably weakens the grip. Magnetic products operate optimally at the point of direct contact; distance drastically cuts the power. Observe how rapidly the pull force drop, when the product does not adhere flatly to the steel surface. When calculating the mounting, discard additional spacers.

Table 2: Sliding capacity (vertical surface)
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 calculates the approximate holding capacity necessary to start the downward movement of the magnet downwards on a vertical steel wall (considering standard friction). The holding force varies with the separation distance between the magnet and the metal.

Table 3: Wall mounting (shearing) - vertical pull
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 mounting a holder on a upright surface (e.g., a car body), it will only hold only approx. 1/5 of nominal attraction strength. Gravitational force and a low friction coefficient influence the fact that magnets slip faster than they pop off the substrate. Designing a vertical fastening? Consider that the shear force is much weaker than the maximum static pull force. On a smooth steel, the element will give way down under a much lighter cargo. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (saturation) - power losses
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 metal plate is incapable of focus the entire magnetic field, which weakens actual performance of the holder. Should you install a neodymium to a thin surface, the flux will penetrate right through and the attraction force will be weaker. To squeeze 100% of this neodymium's power, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the holder shows lower pull force. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - power drop
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
Standard neodymium magnets lose power above the temperature limit. Avoid high temperatures – heat can permanently destroy this product. With increasing heat, the magnet's force briefly lowers. Avoid using this product in hot environments higher than its operating temperature limit. Too high temperature will cause permanent loss of magnetic properties.
*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) are more susceptible to demagnetization under lower heat stress than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (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 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 interact from a significantly greater distance than a magnet and steel setup. The setup of two magnets generates a stronger field and a larger range of performance. Designing a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Remember that when bringing together two magnets, the impact force is massive. The repulsion force is slightly lower than the attraction, but still large.
*Field value for N-N configuration reaches ~0 Gs at the geometric center of the gap (resulting from vector opposition).
Important: Estimates demonstrate friction force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - 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
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
Powerful magnet radiation poses a large risk to electronics and pacemakers. These neodymiums produce a field that prevents correct functioning of digital equipment. Notice: the invisible magnetic field acts through matter and housings. Exceptional care must be taken by people with hearing aids and insulin pumps. Also at risk are: automatic timepieces, remotes, speakers, and displays. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
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 prone to chipping – a violent impact against metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Striking energy can trigger coating fragments or injury to fingers. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the magnet. 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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 passing through the magnet pole. Key data when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
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. Buoyancy helps in lifting finds.
1. Vertical hold

*Caution: On a vertical surface, the magnet retains only ~20% of its perpendicular strength.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

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

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%
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: 020160-2026
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Magnet pull force
Magnetic Induction
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This product is a very powerful plate magnet 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 off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block 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 10.67 kg can pinch very hard and cause hematomas. 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. 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).
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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the holding force amounting to approximately 10.67 kg (force ~104.63 N), which, with such a flat shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Benefits

Apart from their superior magnetism, neodymium magnets have these key benefits:
  • They retain full power for around 10 years – the loss is just ~1% (in theory),
  • Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
  • The use of an refined coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
  • 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 exact creating as well as adapting to defined conditions,
  • Versatile presence in future technologies – they serve a role in HDD drives, brushless drives, diagnostic systems, and modern systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Limitations

Cons of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon strong impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
  • Limited ability of creating threads in the magnet and complex shapes - recommended is cover - magnet mounting.
  • Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a theoretical maximum value performed under specific, ideal conditions:
  • on a block made of structural steel, effectively closing the magnetic field
  • whose transverse dimension equals approx. 10 mm
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • at standard ambient temperature

Key elements affecting lifting force

In practice, the real power results from several key aspects, ranked from the most important:
  • Space between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Choking Hazard

Adult use only. Tiny parts pose a choking risk, causing severe trauma. Store out of reach of children and animals.

Protective goggles

NdFeB magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.

Keep away from electronics

Remember: neodymium magnets produce a field that disrupts precision electronics. Maintain a separation from your mobile, device, and navigation systems.

Do not drill into magnets

Dust generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Medical implants

Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Nickel allergy

A percentage of the population have a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Extended handling may cause an allergic reaction. It is best to use protective gloves.

Electronic hazard

Intense magnetic fields can erase data on payment cards, HDDs, and other magnetic media. Keep a distance of min. 10 cm.

Crushing force

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

Demagnetization risk

Keep cool. Neodymium magnets are susceptible to heat. If you need resistance above 80°C, ask us about HT versions (H, SH, UH).

Handling guide

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Safety First! Learn more about hazards in the article: Magnet Safety Guide.