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MPL 40x10x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020150

GTIN/EAN: 5906301811565

5.00

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

12 g

Magnetization Direction

↑ axial

Load capacity

9.31 kg / 91.33 N

Magnetic Induction

275.57 mT / 2756 Gs

Coating

[NiCuNi] Nickel

check technical data »

4.87 ZŁ with VAT / pcs + price for transport

3.96 ZŁ net + 23% VAT / pcs

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Force as well as shape of a neodymium magnet can be checked with our modular calculator.

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Physical properties - MPL 40x10x4 / N38 - lamellar magnet

Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020150
GTIN/EAN 5906301811565
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 10 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 12 g
Magnetization Direction ↑ axial
Load capacity ~ ? 9.31 kg / 91.33 N
Magnetic Induction ~ ? 275.57 mT / 2756 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x4 / 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

Physical simulation of the magnet - technical parameters

The following information constitute the outcome of a physical simulation. Results rely on models for the class Nd2Fe14B. Operational performance may differ from theoretical values. Please consider these data as a reference point when designing systems.

Table 1: Static force (force vs gap) - characteristics
MPL 40x10x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2755 Gs
275.5 mT
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 medium risk
1 mm 2413 Gs
241.3 mT
 7.14 kg / 15.75 pounds
7143.1 g / 70.1 N
 medium risk
2 mm 2044 Gs
204.4 mT
 5.13 kg / 11.31 pounds
5128.9 g / 50.3 N
 medium risk
3 mm 1703 Gs
170.3 mT
 3.56 kg / 7.85 pounds
3559.5 g / 34.9 N
 medium risk
5 mm 1173 Gs
117.3 mT
 1.69 kg / 3.72 pounds
1688.2 g / 16.6 N
 low risk
10 mm 522 Gs
52.2 mT
 0.33 kg / 0.74 pounds
334.9 g / 3.3 N
 low risk
15 mm 277 Gs
27.7 mT
 0.09 kg / 0.21 pounds
94.2 g / 0.9 N
 low risk
20 mm 163 Gs
16.3 mT
 0.03 kg / 0.07 pounds
32.8 g / 0.3 N
 low risk
30 mm 69 Gs
6.9 mT
 0.01 kg / 0.01 pounds
5.8 g / 0.1 N
 low risk
50 mm 19 Gs
1.9 mT
 0.00 kg / 0.00 pounds
0.5 g / 0.0 N
 low risk
Pulling power decreases sharply with every mm of gap. Note that even a very thin break (e.g., dirt, paint, rust) strongly reduces the pull force. Magnets work strongest in perfect adhesion; distance weakens the force. Observe how rapidly the load capacity plummet, when the magnet does not adhere flatly to the metal substrate. When planning the arrangement, avoid redundant distances.

Table 2: Slippage force (wall)
MPL 40x10x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
1 mm Stal (~0.2) 1.43 kg / 3.15 pounds
1428.0 g / 14.0 N
2 mm Stal (~0.2) 1.03 kg / 2.26 pounds
1026.0 g / 10.1 N
3 mm Stal (~0.2) 0.71 kg / 1.57 pounds
712.0 g / 7.0 N
5 mm Stal (~0.2) 0.34 kg / 0.75 pounds
338.0 g / 3.3 N
10 mm Stal (~0.2) 0.07 kg / 0.15 pounds
66.0 g / 0.6 N
15 mm Stal (~0.2) 0.02 kg / 0.04 pounds
18.0 g / 0.2 N
20 mm Stal (~0.2) 0.01 kg / 0.01 pounds
6.0 g / 0.1 N
30 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
0.0 g / 0.0 N
This section calculates the estimated weight limit needed to initiate the slippage of the magnet vertically along a vertical metal surface (considering typical friction). This value is a function of the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 40x10x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.79 kg / 6.16 pounds
2793.0 g / 27.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.86 kg / 4.11 pounds
1862.0 g / 18.3 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.93 kg / 2.05 pounds
931.0 g / 9.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
When hanging a magnet on a vertical wall (e.g., a car body), it will only hold just about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that holders slide down easier than they detach. Want to create a vertical fastening? Note that the sliding force is noticeably lower than the perpendicular breakaway force. On a painted metal, the holder will slide down under a significantly smaller weight. Using a rubber pad can effectively improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 40x10x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.93 kg / 2.05 pounds
931.0 g / 9.1 N
1 mm
25%
 2.33 kg / 5.13 pounds
2327.5 g / 22.8 N
2 mm
50%
 4.66 kg / 10.26 pounds
4655.0 g / 45.7 N
3 mm
75%
 6.98 kg / 15.39 pounds
6982.5 g / 68.5 N
5 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
10 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
11 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
12 mm
100%
 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
A thin metal plate is unable to conduct the entire magnetic field, which weakens actual performance of the magnet. If you attach a powerful product to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this neodymium's power, you need a suitably thick piece of metal. The material oversaturation means that on delicate walls (e.g., car bodies), the magnet holds weaker. We advise picking the steel dimension based on the following data.

Table 5: Working in heat (stability) - power drop
MPL 40x10x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 9.31 kg / 20.53 pounds
9310.0 g / 91.3 N
 OK
40 °C -2.2% 9.11 kg / 20.07 pounds
9105.2 g / 89.3 N
 OK
60 °C -4.4% 8.90 kg / 19.62 pounds
8900.4 g / 87.3 N
80 °C -6.6% 8.70 kg / 19.17 pounds
8695.5 g / 85.3 N
100 °C -28.8% 6.63 kg / 14.61 pounds
6628.7 g / 65.0 N
Classic neodymiums lose strength after exceeding the maximum temperature. Protect against heat – high temperature can permanently destroy this magnet. With increasing heat, the magnet's capacity momentarily lowers. Refrain from using this magnet close to ovens exceeding its safe range. Exceeding the critical threshold will lead to irreversible degradation of magnetism.
*Technical advisory: Heat tolerance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) are more susceptible to demagnetization sooner than long magnets. Warning indicator in the table indicates a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 40x10x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 18.71 kg / 41.25 pounds
4 164 Gs
2.81 kg / 6.19 pounds
2807 g / 27.5 N
 N/A
1 mm 16.57 kg / 36.53 pounds
5 185 Gs
2.49 kg / 5.48 pounds
2486 g / 24.4 N
 14.91 kg / 32.88 pounds
~0 Gs
2 mm 14.36 kg / 31.65 pounds
4 826 Gs
2.15 kg / 4.75 pounds
2153 g / 21.1 N
 12.92 kg / 28.48 pounds
~0 Gs
3 mm 12.24 kg / 26.98 pounds
4 455 Gs
1.84 kg / 4.05 pounds
1836 g / 18.0 N
 11.01 kg / 24.28 pounds
~0 Gs
5 mm 8.61 kg / 18.98 pounds
3 737 Gs
1.29 kg / 2.85 pounds
1291 g / 12.7 N
 7.75 kg / 17.08 pounds
~0 Gs
10 mm 3.39 kg / 7.48 pounds
2 346 Gs
0.51 kg / 1.12 pounds
509 g / 5.0 N
 3.05 kg / 6.73 pounds
~0 Gs
20 mm 0.67 kg / 1.48 pounds
1 045 Gs
0.10 kg / 0.22 pounds
101 g / 1.0 N
 0.61 kg / 1.34 pounds
~0 Gs
50 mm 0.03 kg / 0.06 pounds
207 Gs
0.00 kg / 0.01 pounds
4 g / 0.0 N
 0.02 kg / 0.05 pounds
~0 Gs
60 mm 0.01 kg / 0.03 pounds
138 Gs
0.00 kg / 0.00 pounds
2 g / 0.0 N
 0.01 kg / 0.02 pounds
~0 Gs
70 mm 0.01 kg / 0.01 pounds
96 Gs
0.00 kg / 0.00 pounds
1 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
80 mm 0.00 kg / 0.01 pounds
69 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
90 mm 0.00 kg / 0.00 pounds
51 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
100 mm 0.00 kg / 0.00 pounds
39 Gs
0.00 kg / 0.00 pounds
0 g / 0.0 N
 0.00 kg / 0.00 pounds
~0 Gs
Two magnets interact from a much further distance than a magnet and sheet setup. Such a system of two magnets produces a massive flux and a further horizon of performance. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. 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 large.
*Flux density between like poles reaches ~0 Gs in the exact middle of the gap (due to field cancellation).
Important: Figures show friction force of two same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 40x10x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 8.5 cm
Hearing aid 10 Gs (1.0 mT) 6.5 cm
Timepiece 20 Gs (2.0 mT) 5.0 cm
Mobile device 40 Gs (4.0 mT) 4.0 cm
Remote 50 Gs (5.0 mT) 3.5 cm
Payment card 400 Gs (40.0 mT) 1.5 cm
HDD hard drive 600 Gs (60.0 mT) 1.0 cm
A strong magnetic field poses a large risk to electronic devices and pacemakers. These neodymiums generate a flux that prevents correct functioning of sensitive medical devices. Notice: the invisible magnetic field passes through tissues and housings. Special caution must be taken by people with cochlear implants and drug dispensers. The risk also applies to: automatic timepieces, remotes, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 40x10x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 28.72 km/h
(7.98 m/s)
 0.38 J
30 mm 48.67 km/h
(13.52 m/s)
 1.10 J
50 mm 62.82 km/h
(17.45 m/s)
 1.83 J
100 mm 88.83 km/h
(24.68 m/s)
 3.65 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or dangerous crushing to fingers. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Use safety goggles when handling with powerful specimens.

Table 9: Surface protection spec
MPL 40x10x4 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Flux)
MPL 40x10x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 9 840 Mx 98.4 µWb
Pc Coefficient 0.26 Low (Flat)
Flux value passing through the pole surface. Key data when building generators as well as sensors. Pc value defines the working geometry.

Table 11: Submerged application
MPL 40x10x4 / N38

Environment Effective steel pull Effect
Air (land) 9.31 kg Standard
Water (riverbed) 10.66 kg
(+1.35 kg buoyancy gain)
+14.5%
Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.
1. Wall mount (shear)

*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its max power.

2. Efficiency vs thickness

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

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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%
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: 020150-2026
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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 40x10x4 mm and a weight of 12 g, guarantees the highest quality connection. As a block magnet with high power (approx. 9.31 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
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. Watch your fingers! Magnets with a force of 9.31 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. 9.31 kg), they are ideal as closers 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 40x10x4 / N38 model is magnetized axially (dimension 4 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 (40x10 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), 10 mm (width), and 4 mm (thickness). The key parameter here is the holding force amounting to approximately 9.31 kg (force ~91.33 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of rare earth magnets.

Strengths

Besides their stability, neodymium magnets are valued for these benefits:
  • They retain attractive force for around 10 years – the drop is just ~1% (based on simulations),
  • Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the glossy finish, the coating of nickel, gold-plated, or silver gives an visually attractive appearance,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of custom machining as well as optimizing to complex applications,
  • Universal use in modern industrial fields – they are used in hard drives, electric drive systems, precision medical tools, also technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
  • Neodymium magnets decrease 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 stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
  • We recommend casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these magnets are able to disrupt the diagnostic process medical after entering the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum magnetic pulling force – what contributes to it?

Holding force of 9.31 kg is a theoretical maximum value conducted under standard conditions:
  • on a block made of structural steel, perfectly concentrating the magnetic flux
  • whose transverse dimension equals approx. 10 mm
  • characterized by even structure
  • without the slightest clearance between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Real force is affected by specific conditions, including (from priority):
  • Clearance – the presence of foreign body (paint, tape, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Base massiveness – insufficiently thick plate causes magnetic saturation, causing part of the power to be wasted into the air.
  • Steel grade – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
  • Surface condition – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.

H&S for magnets
Pacemakers

Warning for patients: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Threat to navigation

Be aware: neodymium magnets generate a field that interferes with precision electronics. Keep a separation from your mobile, tablet, and GPS.

Dust explosion hazard

Mechanical processing of NdFeB material poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Power loss in heat

Do not overheat. Neodymium magnets are sensitive to heat. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Respect the power

Be careful. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.

Bodily injuries

Protect your hands. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Be careful!

Magnet fragility

Despite the nickel coating, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.

Allergic reactions

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, avoid direct skin contact or opt for versions in plastic housing.

Keep away from computers

Do not bring magnets near a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.

This is not a toy

Absolutely keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets connecting inside the body are tragic.

Important! Need more info? Check our post: Why are neodymium magnets dangerous?