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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

see technical specifications »

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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

Technical simulation of the assembly - data

Presented information are the direct effect of a engineering calculation. Values are based on algorithms for the class Nd₂Fe₁₄B. Real-world parameters might slightly differ from theoretical values. Use these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - power drop
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	warning
1 mm	2413 Gs 241.3 mT	7.14 kg / 7143.1 g 70.1 N	warning
2 mm	2044 Gs 204.4 mT	5.13 kg / 5128.9 g 50.3 N	warning
3 mm	1703 Gs 170.3 mT	3.56 kg / 3559.5 g 34.9 N	warning
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

Magnetic force drops sharply with every mm of gap. Remember that even a microscopic distance (e.g., contamination, varnish, veneer) noticeably diminishes the holding power. Magnets hold most effectively during direct contact; air break drastically cuts the force. Analyze how flashily the parameters drop, when the product does not adhere directly to the metal substrate. When calculating the mounting, avoid additional spacers.

Table 2: Shear force (vertical surface)
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

This section presents the approximate force necessary to cause the slippage of the magnet down against a vertical steel plate (considering typical friction). This parameter varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 upright wall (e.g., a board), it you can count on 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 detach. Designing a vertical fastening? Note that the shear force is noticeably lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a noticeably lighter weight. Application of an anti-slip layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - 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 too thin steel is not enough to absorb the full magnetic flux, which wastes potential of the holder. Should you attach a powerful product to a thin surface, the magnetism will pass right through and the attraction force will be weaker. To squeeze full efficiency of this magnet's potential, you need a suitably thick backing of steel. The saturation effect means that on delicate walls (e.g., appliance housings), the product works worse. We advise picking the steel thickness according to the table below.

Table 5: Thermal stability (stability) - 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 change their properties power after exceeding the maximum temperature. Avoid high temperatures – heat can permanently damage this product. As the temperature rises, the neodymium's power briefly decreases. Do not use this magnet in hot environments exceeding its safe range. Ignoring the limit will result in permanent loss of magnetic properties.

*Important note: Thermal stability depends not only on the material grade, but also on the magnet's shape. Low-profile magnets (low Pc) risk losing magnetic properties at lower temperatures than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
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 strong neodymiums interact from a much further distance than a magnet and sheet setup. Such a system of two magnets creates a more powerful interaction and a further horizon of performance. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when connecting a pair of magnets, the pinch force is huge. The levitation is slightly lower than the connection force, but still impressive.
*Flux density between like poles reaches ~0 Gs at the midpoint between the magnets (resulting from vector opposition).

Table 7: Hazards (electronics) - warnings
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
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 is a large risk to electronics as well as medical implants. These neodymiums produce a flux that disrupts operation of sensitive medical devices. Be aware: the unseen radiation penetrates the body and glass. Increased vigilance must be exercised by people with cochlear implants and drug dispensers. Also at risk are: mechanical watches, car keys, speakers, and displays. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (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

Magnetic elements are delicate – a violent impact against metal causes immediate chipping. Control the attraction moment – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to skin. Be sure to control the product during mounting so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear safety glasses when handling 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 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 (P_c)
MPL 40x10x4 / N38

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

Total magnetic flux passing through the magnet pole. Essential parameter for generator designers and motors. The P_c coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

Contrary to myths, water does not block the magnetic field. However, remember the water resistance when pulling the rope quickly.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet holds just a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely weakens the holding force.

3. Temperature resistance

*For N38 material, the critical limit 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 and environmental data

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%

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

Force (pull)

lbs

Magnetic Field

Gauss (Gs)

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Component MPL 40x10x4 / N38 features a low profile and professional pulling force, making it a perfect 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. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x10x4 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.

They constitute a key element in the production of 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).

The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.

This model is characterized by dimensions 40x10x4 mm, which, at a weight of 12 g, makes it an element with impressive energy density. The key parameter here is the lifting capacity amounting to approximately 9.31 kg (force ~91.33 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

They retain attractive force for nearly 10 years – the drop is just ~1% (in theory),
They have excellent resistance to magnetic field loss as a result of external fields,
In other words, due to the aesthetic surface of nickel, the element becomes visually attractive,
Neodymium magnets deliver maximum magnetic induction on a small area, which increases force concentration,
Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
Possibility of exact machining as well as optimizing to specific conditions,
Universal use in advanced technology sectors – they serve a role in computer drives, drive modules, advanced medical instruments, also industrial machines.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets and ways of using them

At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as 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
They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
We recommend cover - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Breakaway force was defined for optimal configuration, taking into account:

using a base made of high-permeability steel, serving as a magnetic yoke
possessing a thickness of min. 10 mm to ensure full flux closure
with an ideally smooth touching surface
without any insulating layer between the magnet and steel
for force applied at a right angle (pull-off, not shear)
at ambient temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding may be lower subject to the following factors, starting with the most relevant:

Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
Loading method – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
Base smoothness – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet and the plate reduces the load capacity.

Precautions when working with NdFeB magnets

Warning for allergy sufferers

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If an allergic reaction appears, immediately stop handling magnets and use protective gear.

Protective goggles

Watch out for shards. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Medical interference

Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.

Do not give to children

Adult use only. Small elements pose a choking risk, causing serious injuries. Store away from kids and pets.

Immense force

Be careful. Rare earth magnets act from a distance and connect with huge force, often quicker than you can move away.

Phone sensors

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Dust is flammable

Drilling and cutting of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Protect data

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Heat warning

Standard neodymium magnets (grade N) lose power when the temperature surpasses 80°C. Damage is permanent.

Physical harm

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

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

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

Technical simulation of the assembly - data

Table 1: Static pull force (pull vs gap) - power drop MPL 40x10x4 / N38

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces MPL 40x10x4 / N38

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

Table 5: Thermal stability (stability) - thermal limit MPL 40x10x4 / N38

Table 6: Magnet-Magnet interaction (attraction) - field range MPL 40x10x4 / N38

Table 7: Hazards (electronics) - warnings MPL 40x10x4 / N38

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

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

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

Table 11: Underwater work (magnet fishing) MPL 40x10x4 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Temperature resistance

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

Material specification

Sustainability

Force (pull)

Magnetic Field

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Advantages as well as disadvantages of rare earth magnets.

Advantages

Weaknesses

Lifting parameters

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Magnet lifting force in use – key factors

Precautions when working with NdFeB magnets

Warning for allergy sufferers

Protective goggles

Medical interference

Do not give to children

Immense force

Phone sensors

Dust is flammable

Protect data

Heat warning

Physical harm

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs gap) - power drop
MPL 40x10x4 / N38

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

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
MPL 40x10x4 / N38

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

Table 5: Thermal stability (stability) - thermal limit
MPL 40x10x4 / N38

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x10x4 / N38

Table 7: Hazards (electronics) - warnings
MPL 40x10x4 / N38

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

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

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

Table 11: Underwater work (magnet fishing)
MPL 40x10x4 / N38