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MPL 40x10x4 / N38 - lamellar magnet

Name: Dhit sp. z o.o.
Address: Kościuszki 6A, Ożarów Mazowiecki, Poland, 05-850, PL
Telephone: +48 22 499 98 98
Price range: 1-6500
Rating: 5

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

technical parameters »

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Technical - 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

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 assembly - data

Presented values constitute the direct effect of a mathematical calculation. Results are based on algorithms for the class Nd₂Fe₁₄B. Real-world performance may deviate from the simulation results. Please consider these calculations as a supplementary guide during assembly planning.

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

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2755 Gs 275.5 mT	9.31 kg / 9310.0 g 91.3 N	strong
1 mm	2413 Gs 241.3 mT	7.14 kg / 7143.1 g 70.1 N	strong
2 mm	2044 Gs 204.4 mT	5.13 kg / 5128.9 g 50.3 N	strong
3 mm	1703 Gs 170.3 mT	3.56 kg / 3559.5 g 34.9 N	strong
5 mm	1173 Gs 117.3 mT	1.69 kg / 1688.2 g 16.6 N	low risk
10 mm	522 Gs 52.2 mT	0.33 kg / 334.9 g 3.3 N	low risk
15 mm	277 Gs 27.7 mT	0.09 kg / 94.2 g 0.9 N	low risk
20 mm	163 Gs 16.3 mT	0.03 kg / 32.8 g 0.3 N	low risk
30 mm	69 Gs 6.9 mT	0.01 kg / 5.8 g 0.1 N	low risk
50 mm	19 Gs 1.9 mT	0.00 kg / 0.5 g 0.0 N	low risk

Pulling power decreases significantly per each millimeter of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, veneer) strongly reduces the pull force. Neodymiums work strongest at the point of direct contact; gap nullifies the power. Analyze how quickly the parameters drop, when the product does not touch tightly to the metal substrate. When planning the assembly, discard redundant distances.

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

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.86 kg / 1862.0 g 18.3 N
1 mm	Stal (~0.2)	1.43 kg / 1428.0 g 14.0 N
2 mm	Stal (~0.2)	1.03 kg / 1026.0 g 10.1 N
3 mm	Stal (~0.2)	0.71 kg / 712.0 g 7.0 N
5 mm	Stal (~0.2)	0.34 kg / 338.0 g 3.3 N
10 mm	Stal (~0.2)	0.07 kg / 66.0 g 0.6 N
15 mm	Stal (~0.2)	0.02 kg / 18.0 g 0.2 N
20 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
30 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The table below presents the theoretical weight limit required to cause the downward movement of the magnet down against a vertical metal surface (assuming typical friction). This value varies with the distance between the magnet and the metal.

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

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.79 kg / 2793.0 g 27.4 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.86 kg / 1862.0 g 18.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.93 kg / 931.0 g 9.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	4.66 kg / 4655.0 g 45.7 N

When placing a magnet on a vertical surface (e.g., a car body), it will only hold only approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that holders slide down easier than they pull off. Want to create a wall mount? Consider that the sliding force is noticeably lower than the maximum static pull force. On a painted metal, the element will slip down under a significantly smaller weight. Application of an anti-slip pad can significantly improve the result.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x10x4 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.93 kg / 931.0 g 9.1 N
1 mm	25%	2.33 kg / 2327.5 g 22.8 N
2 mm	50%	4.66 kg / 4655.0 g 45.7 N
5 mm	100%	9.31 kg / 9310.0 g 91.3 N
10 mm	100%	9.31 kg / 9310.0 g 91.3 N

A thin sheet cannot conduct the entire magnetic field, which squanders power of the holder. Should you attach a powerful product to a thin surface, the flux will penetrate right through and the holding will be smaller. To achieve 100% of this magnet's power, you require a sufficiently solid element of steel. The material oversaturation causes that on thin elements (e.g., appliance housings), the magnet shows lower pull force. We suggest choosing the steel dimension from these parameters.

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x10x4 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	9.31 kg / 9310.0 g 91.3 N	OK
40 °C	-2.2%	9.11 kg / 9105.2 g 89.3 N	OK
60 °C	-4.4%	8.90 kg / 8900.4 g 87.3 N
80 °C	-6.6%	8.70 kg / 8695.5 g 85.3 N
100 °C	-28.8%	6.63 kg / 6628.7 g 65.0 N

Standard neodymium magnets lose power past the thermal threshold. Protect against heat – high temperature can permanently damage this magnet. With increasing heat, the magnet's force momentarily decreases. Do not use this magnet close to heaters higher than its operating temperature limit. Ignoring the limit will result in permanent loss of magnetic properties.

*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low permeance coefficient) may lose charge permanently under lower heat stress compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	18.71 kg / 18711 g 183.6 N 4 164 Gs	N/A
1 mm	16.57 kg / 16572 g 162.6 N 5 185 Gs	14.91 kg / 14915 g 146.3 N ~0 Gs
2 mm	14.36 kg / 14356 g 140.8 N 4 826 Gs	12.92 kg / 12920 g 126.7 N ~0 Gs
3 mm	12.24 kg / 12238 g 120.1 N 4 455 Gs	11.01 kg / 11015 g 108.1 N ~0 Gs
5 mm	8.61 kg / 8609 g 84.5 N 3 737 Gs	7.75 kg / 7748 g 76.0 N ~0 Gs
10 mm	3.39 kg / 3393 g 33.3 N 2 346 Gs	3.05 kg / 3054 g 30.0 N ~0 Gs
20 mm	0.67 kg / 673 g 6.6 N 1 045 Gs	0.61 kg / 606 g 5.9 N ~0 Gs
50 mm	0.03 kg / 26 g 0.3 N 207 Gs	0.02 kg / 24 g 0.2 N ~0 Gs

Two magnets attract each other from a much further distance than a magnet and sheet setup. The connection of two magnets generates a stronger field and a larger range of performance. Want to build a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is slightly lower than the connection force, but still significant.
*Flux density in repulsion mode reaches ~0 Gs at the midpoint of the gap (caused by magnetic field nullification).

Table 7: Protective zones (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
Mechanical watch	20 Gs (2.0 mT)	5.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	4.0 cm
Car key	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

Powerful magnet radiation is a real danger to electronic devices as well as pacemakers. These neodymiums produce a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Special caution must be taken by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 40x10x4 / N38

Start from (mm)	Speed (km/h)	Energy (J)
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

Neodymium magnets are prone to chipping – a violent impact against metal can result in shattering. Control the attraction moment – a magnet released freely turns into a projectile. Impact energy can cause material chips or injury to skin. Be sure to control the product during mounting 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 magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
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 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 40x10x4 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	9 840 Mx	98.4 µWb
P_c Coefficient	0.26	Low (Flat)

Flux value passing through the pole surface. Essential parameter for generator designers as well as sensors. The P_c coefficient determines the magnet's operating point.

Table 11: Hydrostatics and buoyancy
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%

Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

The magnetic field penetrates through water without any losses. 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 surface, the magnet holds merely a fraction of its perpendicular strength.

2. Efficiency vs thickness

*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient P_c (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 P_c (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 P_c 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

Elemental analysis

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: 020150-2025

Measurement Calculator

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Kilograms (kg)

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Component MPL 40x10x4 / N38 features a low profile and professional pulling force, making it an ideal solution for building separators and machines. This rectangular block with a force of 91.33 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.

The key to success is shifting 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 40x10x4 / 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 wind generators and material handling systems. They work great as invisible mounts 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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.

Standardly, the MPL 40x10x4 / N38 model is magnetized through the thickness (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. This is the most popular configuration for block magnets used in separators and holders.

This model is characterized by dimensions 40x10x4 mm, which, at a weight of 12 g, makes it an element with high energy density. It is a magnetic block with dimensions 40x10x4 mm and a self-weight of 12 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of Nd₂Fe₁₄B magnets.

Strengths

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

They retain full power for around 10 years – the loss is just ~1% (according to analyses),
They maintain their magnetic properties even under close interference source,
By covering with a lustrous layer of silver, the element gains an professional look,
They show high magnetic induction at the operating surface, which improves attraction properties,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures approaching 230°C and above...
Thanks to versatility in forming and the capacity to modify to complex applications,
Versatile presence in future technologies – they are used in mass storage devices, brushless drives, medical devices, and modern systems.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Limitations

Disadvantages of NdFeB magnets:

At very strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
When exposed to high temperature, neodymium magnets suffer 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
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
Limited ability of making nuts in the magnet and complex forms - preferred is casing - magnetic holder.
Possible danger related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical when they are in the body.
Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

Information about lifting capacity was determined for optimal configuration, taking into account:

using a base made of low-carbon steel, acting as a magnetic yoke
with a cross-section minimum 10 mm
with a surface free of scratches
without any insulating layer between the magnet and steel
under vertical force direction (90-degree angle)
in temp. approx. 20°C

Determinants of lifting force in real conditions

Effective lifting capacity impacted by working environment parameters, mainly (from most important):

Clearance – existence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
Base massiveness – insufficiently thick sheet does not close the flux, causing part of the flux to be wasted to the other side.
Material type – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
Temperature influence – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 75%. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Warnings

Danger to pacemakers

For implant holders: Strong magnetic fields affect medical devices. Maintain minimum 30 cm distance or request help to work with the magnets.

Keep away from electronics

Note: rare earth magnets generate a field that disrupts precision electronics. Maintain a separation from your phone, tablet, and GPS.

Do not overheat magnets

Keep cool. Neodymium magnets are susceptible to temperature. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Magnet fragility

Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.

Pinching danger

Protect your hands. Two large magnets will join immediately with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Skin irritation risks

Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. For allergy sufferers, avoid touching magnets with bare hands and choose encased magnets.

Cards and drives

Avoid bringing magnets near a wallet, computer, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.

Do not underestimate power

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

Dust is flammable

Fire warning: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Choking Hazard

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep away from kids and pets.

Caution! Looking for details? Check our post: Are neodymium magnets dangerous?

MPL 40x10x4 / N38 - lamellar magnet

Technical - MPL 40x10x4 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - data

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

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

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

Table 4: Steel thickness (substrate influence) - sheet metal selection MPL 40x10x4 / N38

Table 5: Working in heat (material behavior) - thermal limit MPL 40x10x4 / N38

Table 6: Two magnets (repulsion) - forces in the system MPL 40x10x4 / N38

Table 7: Protective zones (implants) - precautionary measures MPL 40x10x4 / N38

Table 8: Dynamics (kinetic energy) - collision effects MPL 40x10x4 / N38

Table 9: Coating parameters (durability) MPL 40x10x4 / N38

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

Table 11: Hydrostatics and buoyancy MPL 40x10x4 / N38

1. Wall mount (shear)

2. Efficiency vs thickness

3. Thermal stability

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

Elemental analysis

Sustainability

Magnet pull force

Field Strength

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MPL 10x5x1.5 / N38 - lamellar magnet

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Limitations

Pull force analysis

Best holding force of the magnet in ideal parameters – what contributes to it?

Determinants of lifting force in real conditions

Warnings

Danger to pacemakers

Keep away from electronics

Do not overheat magnets

Magnet fragility

Pinching danger

Skin irritation risks

Cards and drives

Do not underestimate power

Dust is flammable

Choking Hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

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

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

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 40x10x4 / N38

Table 5: Working in heat (material behavior) - thermal limit
MPL 40x10x4 / N38

Table 6: Two magnets (repulsion) - forces in the system
MPL 40x10x4 / N38

Table 7: Protective zones (implants) - precautionary measures
MPL 40x10x4 / N38

Table 8: Dynamics (kinetic energy) - collision effects
MPL 40x10x4 / N38

Table 9: Coating parameters (durability)
MPL 40x10x4 / N38

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

Table 11: Hydrostatics and buoyancy
MPL 40x10x4 / N38

Advantages and disadvantages of Nd₂Fe₁₄B magnets.