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MPL 40x7x3 / 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: PLN 1-6500
Rating: 5

lamellar magnet

Catalog no 020162

GTIN/EAN: 5906301811688

5.00

length

40 mm [±0,1 mm]

Width

7 mm [±0,1 mm]

Height

3 mm [±0,1 mm]

Weight

6.3 g

Magnetization Direction

↑ axial

Load capacity

7.14 kg / 70.02 N

Magnetic Induction

284.46 mT / 2845 Gs

Coating

[NiCuNi] Nickel

check parameters »

2.79 ZŁ with VAT / pcs + price for transport

2.27 ZŁ net + 23% VAT / pcs

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Physical properties - MPL 40x7x3 / N38 - lamellar magnet

Specification / characteristics - MPL 40x7x3 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020162
GTIN/EAN	5906301811688
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	7 mm [±0,1 mm]
Height	3 mm [±0,1 mm]
Weight	6.3 g
Magnetization Direction	↑ axial
Load capacity ~ ?	7.14 kg / 70.02 N
Magnetic Induction ~ ?	284.46 mT / 2845 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x7x3 / 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 modeling of the assembly - technical parameters

The following data constitute the outcome of a physical analysis. Values rely on algorithms for the material Nd₂Fe₁₄B. Real-world conditions may deviate from the simulation results. Use these calculations as a supplementary guide for designers.

Table 1: Static pull force (force vs distance) - characteristics
MPL 40x7x3 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2843 Gs 284.3 mT	7.14 kg / 7140.0 g 70.0 N	medium risk
1 mm	2314 Gs 231.4 mT	4.73 kg / 4729.9 g 46.4 N	medium risk
2 mm	1788 Gs 178.8 mT	2.83 kg / 2825.3 g 27.7 N	medium risk
3 mm	1365 Gs 136.5 mT	1.65 kg / 1645.1 g 16.1 N	safe
5 mm	824 Gs 82.4 mT	0.60 kg / 599.2 g 5.9 N	safe
10 mm	317 Gs 31.7 mT	0.09 kg / 88.6 g 0.9 N	safe
15 mm	160 Gs 16.0 mT	0.02 kg / 22.5 g 0.2 N	safe
20 mm	92 Gs 9.2 mT	0.01 kg / 7.5 g 0.1 N	safe
30 mm	38 Gs 3.8 mT	0.00 kg / 1.3 g 0.0 N	safe
50 mm	11 Gs 1.1 mT	0.00 kg / 0.1 g 0.0 N	safe

Pulling power weakens significantly per each millimeter of distance. Keep in mind that even a very thin break (e.g., contamination, varnish, dust) strongly reduces the pull force. Magnetic products operate most effectively at the point of direct contact; distance kills the power. See how rapidly the pull force fall, when the product does not touch tightly to the metal substrate. When planning the arrangement, discard additional spacers.

Table 2: Vertical capacity (wall)
MPL 40x7x3 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	1.43 kg / 1428.0 g 14.0 N
1 mm	Stal (~0.2)	0.95 kg / 946.0 g 9.3 N
2 mm	Stal (~0.2)	0.57 kg / 566.0 g 5.6 N
3 mm	Stal (~0.2)	0.33 kg / 330.0 g 3.2 N
5 mm	Stal (~0.2)	0.12 kg / 120.0 g 1.2 N
10 mm	Stal (~0.2)	0.02 kg / 18.0 g 0.2 N
15 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
20 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N
30 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

This section defines the theoretical force sufficient to cause the sliding of the magnet down against a vertical steel plate (assuming standard friction coefficient). This value depends on the separation distance between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x7x3 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	2.14 kg / 2142.0 g 21.0 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	1.43 kg / 1428.0 g 14.0 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	0.71 kg / 714.0 g 7.0 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	3.57 kg / 3570.0 g 35.0 N

When hanging a holder on a vertical wall (e.g., a car body), it will maintain barely approx. 1/5 of nominal attraction strength. Gravitational force and a weak degree of grip influence the fact that magnets slip faster than they pop off the substrate. Want to create a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the holder will slip down under a noticeably lighter cargo. Utilizing a rubberized pad can drastically improve the result.

Table 4: Material efficiency (saturation) - power losses
MPL 40x7x3 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	10%	0.71 kg / 714.0 g 7.0 N
1 mm	25%	1.79 kg / 1785.0 g 17.5 N
2 mm	50%	3.57 kg / 3570.0 g 35.0 N
5 mm	100%	7.14 kg / 7140.0 g 70.0 N
10 mm	100%	7.14 kg / 7140.0 g 70.0 N

A thin sheet is not enough to take in the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To squeeze full efficiency of this neodymium's potential, you need a suitably thick element of steel. The material oversaturation causes that on delicate walls (e.g., thin profiles), the product holds weaker. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MPL 40x7x3 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	7.14 kg / 7140.0 g 70.0 N	OK
40 °C	-2.2%	6.98 kg / 6982.9 g 68.5 N	OK
60 °C	-4.4%	6.83 kg / 6825.8 g 67.0 N
80 °C	-6.6%	6.67 kg / 6668.8 g 65.4 N
100 °C	-28.8%	5.08 kg / 5083.7 g 49.9 N

Ordinary NdFeB products irreversibly lose parameters above the temperature limit. Watch out for overheating – heat can permanently damage this magnet. With increasing heat, the magnet's capacity temporarily drops. Refrain from using this product close to heaters higher than its safe range. Too high temperature will result in destruction of magnetism.

*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. The danger warning in the table signals a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 40x7x3 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	13.95 kg / 13950 g 136.8 N 4 204 Gs	N/A
1 mm	11.58 kg / 11580 g 113.6 N 5 180 Gs	10.42 kg / 10422 g 102.2 N ~0 Gs
2 mm	9.24 kg / 9241 g 90.7 N 4 628 Gs	8.32 kg / 8317 g 81.6 N ~0 Gs
3 mm	7.19 kg / 7194 g 70.6 N 4 083 Gs	6.47 kg / 6475 g 63.5 N ~0 Gs
5 mm	4.21 kg / 4211 g 41.3 N 3 124 Gs	3.79 kg / 3790 g 37.2 N ~0 Gs
10 mm	1.17 kg / 1171 g 11.5 N 1 647 Gs	1.05 kg / 1054 g 10.3 N ~0 Gs
20 mm	0.17 kg / 173 g 1.7 N 633 Gs	0.16 kg / 156 g 1.5 N ~0 Gs
50 mm	0.01 kg / 6 g 0.1 N 115 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnets attract each other from a much further distance than a magnet and steel combination. The connection of two magnets generates a stronger field and a larger range of operation. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is extreme. The levitation is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode drops to ~0 Gs in the exact middle of the gap (due to field cancellation).

Table 7: Hazards (electronics) - warnings
MPL 40x7x3 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	7.0 cm
Hearing aid	10 Gs (1.0 mT)	5.5 cm
Mechanical watch	20 Gs (2.0 mT)	4.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	3.0 cm
Remote	50 Gs (5.0 mT)	3.0 cm
Payment card	400 Gs (40.0 mT)	1.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.0 cm

Powerful magnet radiation is a large risk to electronics as well as medical implants. These NdFeB products generate a flux that disrupts operation of digital equipment. Notice: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - warning
MPL 40x7x3 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	34.21 km/h (9.50 m/s)	0.28 J
30 mm	58.81 km/h (16.34 m/s)	0.84 J
50 mm	75.92 km/h (21.09 m/s)	1.40 J
100 mm	107.36 km/h (29.82 m/s)	2.80 J

NdFeB products are very brittle – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can cause material chips or painful pinches to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the steel surface. A collision at high speed almost guarantees destruction of the magnet. Use safety goggles when playing with large magnets.

Table 9: Coating parameters (durability)
MPL 40x7x3 / 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. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Flux)
MPL 40x7x3 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	6 379 Mx	63.8 µWb
P_c Coefficient	0.24	Low (Flat)

Flux value emitted by the magnet pole. Key data when building generators as well as sensors. P_c value defines the working geometry.

Table 11: Underwater work (magnet fishing)
MPL 40x7x3 / N38

Environment	Effective steel pull	Effect
Air (land)	7.14 kg	Standard
Water (riverbed)	8.18 kg (+1.04 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!

In water, the magnet feels stronger thanks to Archimedes' principle. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.

1. Wall mount (shear)

*Note: On a vertical wall, the magnet retains merely a fraction of its max power.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly reduces the holding force.

3. Thermal stability

*For N38 grade, 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) = 0.24

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.

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%

Environmental data

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: 020162-2025

Magnet Unit Converter

Force (pull)

Kilograms (kg)

Force (N)

lbs

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Gauss (Gs)

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 40x7x3 mm and a weight of 6.3 g, guarantees the highest quality connection. This rectangular block with a force of 70.02 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.

Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 40x7x3 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

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. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.

For mounting flat magnets MPL 40x7x3 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. This is the most popular configuration for block magnets used in separators and holders.

The presented product is a neodymium magnet with precisely defined parameters: 40 mm (length), 7 mm (width), and 3 mm (thickness). The key parameter here is the holding force amounting to approximately 7.14 kg (force ~70.02 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Pros as well as cons of neodymium magnets.

Advantages

Apart from their strong magnetism, neodymium magnets have these key benefits:

They virtually do not lose strength, because even after ten years the performance loss is only ~1% (based on calculations),
They show high resistance to demagnetization induced by presence of other magnetic fields,
A magnet with a metallic nickel surface is more attractive,
Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to freedom in designing and the ability to modify to complex applications,
Versatile presence in modern technologies – they are used in mass storage devices, motor assemblies, diagnostic systems, as well as complex engineering applications.
Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only protects them against impacts but also increases their durability
We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
Due to limitations in creating nuts and complicated shapes in magnets, we propose using casing - magnetic mechanism.
Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Additionally, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

Breakaway force is the result of a measurement for the most favorable conditions, assuming:

using a base made of high-permeability steel, functioning as a circuit closing element
possessing a thickness of min. 10 mm to ensure full flux closure
with an ideally smooth touching surface
without the slightest insulating layer between the magnet and steel
for force applied at a right angle (pull-off, not shear)
in neutral thermal conditions

What influences lifting capacity in practice

Real force impacted by specific conditions, mainly (from most important):

Clearance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
Angle of force application – highest force is available only during perpendicular pulling. The shear force of the magnet along the surface is standardly several times smaller (approx. 1/5 of the lifting capacity).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
Thermal conditions – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Cards and drives

Intense magnetic fields can erase data on credit cards, hard drives, and storage devices. Stay away of at least 10 cm.

Adults only

These products are not suitable for play. Eating several magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.

ICD Warning

Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.

Do not drill into magnets

Drilling and cutting of neodymium magnets poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Magnets are brittle

NdFeB magnets are sintered ceramics, meaning they are very brittle. Clashing of two magnets leads to them breaking into small pieces.

Conscious usage

Handle magnets with awareness. Their huge power can shock even experienced users. Plan your moves and respect their power.

Nickel coating and allergies

Certain individuals have a sensitization to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause an allergic reaction. We recommend use protective gloves.

Serious injuries

Protect your hands. Two powerful magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Operating temperature

Avoid heat. Neodymium magnets are sensitive to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).

Phone sensors

Be aware: rare earth magnets generate a field that disrupts sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.

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

MPL 40x7x3 / N38 - lamellar magnet

Physical properties - MPL 40x7x3 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical modeling of the assembly - technical parameters

Table 1: Static pull force (force vs distance) - characteristics MPL 40x7x3 / N38

Table 2: Vertical capacity (wall) MPL 40x7x3 / N38

Table 3: Wall mounting (shearing) - vertical pull MPL 40x7x3 / N38

Table 4: Material efficiency (saturation) - power losses MPL 40x7x3 / N38

Table 5: Thermal stability (stability) - resistance threshold MPL 40x7x3 / N38

Table 6: Two magnets (repulsion) - field range MPL 40x7x3 / N38

Table 7: Hazards (electronics) - warnings MPL 40x7x3 / N38

Table 8: Dynamics (cracking risk) - warning MPL 40x7x3 / N38

Table 9: Coating parameters (durability) MPL 40x7x3 / N38

Table 10: Electrical data (Flux) MPL 40x7x3 / N38

Table 11: Underwater work (magnet fishing) MPL 40x7x3 / N38

1. Wall mount (shear)

2. Steel saturation

3. Thermal stability

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

Material specification

Environmental data

Force (pull)

Field Strength

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Pros as well as cons of neodymium magnets.

Advantages

Disadvantages

Pull force analysis

Maximum lifting capacity of the magnet – what it depends on?

What influences lifting capacity in practice

Safety rules for work with neodymium magnets

Cards and drives

Adults only

ICD Warning

Do not drill into magnets

Magnets are brittle

Conscious usage

Nickel coating and allergies

Serious injuries

Operating temperature

Phone sensors

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (force vs distance) - characteristics
MPL 40x7x3 / N38

Table 2: Vertical capacity (wall)
MPL 40x7x3 / N38

Table 3: Wall mounting (shearing) - vertical pull
MPL 40x7x3 / N38

Table 4: Material efficiency (saturation) - power losses
MPL 40x7x3 / N38

Table 5: Thermal stability (stability) - resistance threshold
MPL 40x7x3 / N38

Table 6: Two magnets (repulsion) - field range
MPL 40x7x3 / N38

Table 7: Hazards (electronics) - warnings
MPL 40x7x3 / N38

Table 8: Dynamics (cracking risk) - warning
MPL 40x7x3 / N38

Table 9: Coating parameters (durability)
MPL 40x7x3 / N38

Table 10: Electrical data (Flux)
MPL 40x7x3 / N38

Table 11: Underwater work (magnet fishing)
MPL 40x7x3 / N38