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MPL 80x40x15 / 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 020177

GTIN/EAN: 5906301811831

5.00

length

80 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

15 mm [±0,1 mm]

Weight

360 g

Magnetization Direction

↑ axial

Load capacity

73.57 kg / 721.75 N

Magnetic Induction

285.78 mT / 2858 Gs

Coating

[NiCuNi] Nickel

139.54 ZŁ with VAT / pcs + price for transport

113.45 ZŁ net + 23% VAT / pcs

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MPL 80x40x15 / N38 - lamellar magnet

Specification / characteristics MPL 80x40x15 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020177
GTIN/EAN	5906301811831
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	80 mm [±0,1 mm]
Width	40 mm [±0,1 mm]
Height	15 mm [±0,1 mm]
Weight	360 g
Magnetization Direction	↑ axial
Load capacity ~ ?	73.57 kg / 721.75 N
Magnetic Induction ~ ?	285.78 mT / 2858 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 80x40x15 / 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 modeling of the magnet - technical parameters

These values constitute the result of a engineering analysis. Values rely on algorithms for the material Nd₂Fe₁₄B. Operational performance might slightly differ from theoretical values. Use these data as a reference point during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MPL 80x40x15 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	2857 Gs 285.7 mT	73.57 kg / 73570.0 g 721.7 N	dangerous!
1 mm	2778 Gs 277.8 mT	69.55 kg / 69546.1 g 682.2 N	dangerous!
2 mm	2693 Gs 269.3 mT	65.33 kg / 65331.2 g 640.9 N	dangerous!
3 mm	2603 Gs 260.3 mT	61.05 kg / 61047.5 g 598.9 N	dangerous!
5 mm	2415 Gs 241.5 mT	52.56 kg / 52559.7 g 515.6 N	dangerous!
10 mm	1943 Gs 194.3 mT	34.02 kg / 34021.1 g 333.7 N	dangerous!
15 mm	1527 Gs 152.7 mT	21.01 kg / 21007.7 g 206.1 N	dangerous!
20 mm	1192 Gs 119.2 mT	12.81 kg / 12808.1 g 125.6 N	dangerous!
30 mm	736 Gs 73.6 mT	4.89 kg / 4886.6 g 47.9 N	strong
50 mm	313 Gs 31.3 mT	0.88 kg / 884.8 g 8.7 N	weak grip

Magnetic force weakens significantly with every mm of distance. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) noticeably diminishes the holding power. Magnetic products hold strongest during direct contact; distance weakens the power. Analyze how rapidly the load capacity fall, when the magnet does not adhere tightly to the metal substrate. When designing the arrangement, avoid additional spacers.

Table 2: Vertical capacity (vertical surface)
MPL 80x40x15 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	14.71 kg / 14714.0 g 144.3 N
1 mm	Stal (~0.2)	13.91 kg / 13910.0 g 136.5 N
2 mm	Stal (~0.2)	13.07 kg / 13066.0 g 128.2 N
3 mm	Stal (~0.2)	12.21 kg / 12210.0 g 119.8 N
5 mm	Stal (~0.2)	10.51 kg / 10512.0 g 103.1 N
10 mm	Stal (~0.2)	6.80 kg / 6804.0 g 66.7 N
15 mm	Stal (~0.2)	4.20 kg / 4202.0 g 41.2 N
20 mm	Stal (~0.2)	2.56 kg / 2562.0 g 25.1 N
30 mm	Stal (~0.2)	0.98 kg / 978.0 g 9.6 N
50 mm	Stal (~0.2)	0.18 kg / 176.0 g 1.7 N

The following data shows the estimated holding capacity sufficient to cause the slippage of the magnet downwards along a upright metal surface (assuming standard friction coefficient). The holding force varies with the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - vertical pull
MPL 80x40x15 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	22.07 kg / 22071.0 g 216.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	14.71 kg / 14714.0 g 144.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	7.36 kg / 7357.0 g 72.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	36.79 kg / 36785.0 g 360.9 N

When placing a element on a upright plane (e.g., a board), it will maintain just about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient mean that holders slip faster than they pop off the substrate. Designing a hanger? Consider that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the holder will slip down under a significantly smaller weight. Using a rubber pad can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 80x40x15 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	2.45 kg / 2452.3 g 24.1 N
1 mm	8%	6.13 kg / 6130.8 g 60.1 N
2 mm	17%	12.26 kg / 12261.7 g 120.3 N
5 mm	42%	30.65 kg / 30654.2 g 300.7 N
10 mm	83%	61.31 kg / 61308.3 g 601.4 N

A too thin steel is unable to focus the full magnetic flux, which squanders power of the holder. If you attach a powerful product to a weak sheet, the field will penetrate right through and the attraction force will be weaker. To squeeze 100% of this magnet's power, you require a sufficiently solid backing of metal. The material oversaturation causes that on delicate walls (e.g., appliance housings), the magnet works worse. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 80x40x15 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	73.57 kg / 73570.0 g 721.7 N	OK
40 °C	-2.2%	71.95 kg / 71951.5 g 705.8 N	OK
60 °C	-4.4%	70.33 kg / 70332.9 g 690.0 N
80 °C	-6.6%	68.71 kg / 68714.4 g 674.1 N
100 °C	-28.8%	52.38 kg / 52381.8 g 513.9 N

Ordinary NdFeB products irreversibly lose power past the thermal threshold. Avoid high temperatures – excessive heat can irreversibly destroy this magnet. With increasing heat, the magnet's force briefly decreases. Refrain from using this magnet in hot environments exceeding its working range. Too high temperature will lead to permanent loss of magnetic properties.

*Important note: Thermal stability is determined by both grade, but also on the magnet's shape. Low-profile magnets (pancake types) are more susceptible to demagnetization sooner than taller cylinders. The danger warning in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 80x40x15 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	161.08 kg / 161083 g 1580.2 N 4 384 Gs	N/A
1 mm	156.77 kg / 156775 g 1538.0 N 5 638 Gs	141.10 kg / 141097 g 1384.2 N ~0 Gs
2 mm	152.27 kg / 152273 g 1493.8 N 5 556 Gs	137.05 kg / 137046 g 1344.4 N ~0 Gs
3 mm	147.69 kg / 147688 g 1448.8 N 5 472 Gs	132.92 kg / 132920 g 1303.9 N ~0 Gs
5 mm	138.36 kg / 138363 g 1357.3 N 5 297 Gs	124.53 kg / 124527 g 1221.6 N ~0 Gs
10 mm	115.08 kg / 115081 g 1128.9 N 4 830 Gs	103.57 kg / 103573 g 1016.0 N ~0 Gs
20 mm	74.49 kg / 74490 g 730.7 N 3 886 Gs	67.04 kg / 67041 g 657.7 N ~0 Gs
50 mm	17.20 kg / 17197 g 168.7 N 1 867 Gs	15.48 kg / 15477 g 151.8 N ~0 Gs

Two strong neodymiums attract each other from a wider radius than a magnet and sheet combination. Such a system of two magnets generates a stronger field and a further horizon of performance. Designing a powerful holder? Use a pair of magnets instead of one magnet and a steel. Be careful that when attracting two neodymiums, the pinch force is massive. The levitation is a bit weaker than the connection force, but still significant.
*Field value in repulsion mode reaches ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Hazards (implants) - precautionary measures
MPL 80x40x15 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	26.0 cm
Hearing aid	10 Gs (1.0 mT)	20.5 cm
Timepiece	20 Gs (2.0 mT)	16.0 cm
Mobile device	40 Gs (4.0 mT)	12.5 cm
Car key	50 Gs (5.0 mT)	11.5 cm
Payment card	400 Gs (40.0 mT)	4.5 cm
HDD hard drive	600 Gs (60.0 mT)	3.5 cm

A strong magnetic field poses a real danger to electronic devices as well as pacemakers. These magnets produce a field that destroys function of digital equipment. Be aware: the unseen radiation penetrates the body and housings. Special caution must be taken by people with hearing aids and insulin pumps. Influence will be felt by: mechanical watches, car keys, membranes, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - collision effects
MPL 80x40x15 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.11 km/h (5.03 m/s)	4.56 J
30 mm	25.99 km/h (7.22 m/s)	9.38 J
50 mm	32.48 km/h (9.02 m/s)	14.65 J
100 mm	45.61 km/h (12.67 m/s)	28.89 J

Neodymium magnets are delicate – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can cause material chips or dangerous crushing to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the neodymium. Use safety goggles when handling with large magnets.

Table 9: Surface protection spec
MPL 80x40x15 / 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)

For outdoor applications, an epoxy coating is required; standard nickel is intended for indoor use. Note the thickness of the protective layer.

Table 10: Construction data (Flux)
MPL 80x40x15 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	94 833 Mx	948.3 µWb
P_c Coefficient	0.33	Low (Flat)

Total magnetic flux passing through the magnet pole. Essential parameter in coil applications and motors. The P_c coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 80x40x15 / N38

Environment	Effective steel pull	Effect
Air (land)	73.57 kg	Standard
Water (riverbed)	84.24 kg (+10.67 kg Buoyancy gain)	+14.5%

Warning: 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. Buoyancy helps in lifting finds.

1. Wall mount (shear)

*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.

2. Efficiency vs thickness

*Thin steel (e.g. computer case) drastically weakens the holding force.

3. Heat tolerance

*For N38 grade, the critical limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.33

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%

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: 020177-2025

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UMC 42x7/4x9 / N38 - cylindrical magnetic holder

29.99 ZŁ brutto / pcs

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UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

400.00 ZŁ brutto / pcs

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NCM 20x13.5x5 / N38 - channel magnetic holder

7.29 ZŁ brutto / pcs

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MP 30x6x10 / N38 - ring magnet

16.00 ZŁ brutto / pcs

This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 80x40x15 mm and a weight of 360 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 73.57 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.

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 80x40x15 / 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 73.57 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.

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 80x40x15 / N38 model is magnetized through the thickness (dimension 15 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 (80x40 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 80x40x15 mm, which, at a weight of 360 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 80x40x15 mm and a self-weight of 360 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Pros and cons of Nd₂Fe₁₄B magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
They are noted for resistance to demagnetization induced by external disturbances,
The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
They are known for high magnetic induction at the operating surface, which affects their effectiveness,
Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
Possibility of detailed modeling and optimizing to atypical requirements,
Fundamental importance in modern technologies – they find application in hard drives, electromotive mechanisms, advanced medical instruments, also multitasking production systems.
Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages

Cons of neodymium magnets and ways of using them

At very strong impacts they can crack, therefore we recommend placing them in special holders. 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 drop of power (a factor is the shape and 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 rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
We recommend casing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
With budget limitations the cost of neodymium magnets can be a barrier,

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

Magnet power is the result of a measurement for the most favorable conditions, taking into account:

with the application of a yoke made of special test steel, ensuring full magnetic saturation
possessing a thickness of at least 10 mm to avoid saturation
characterized by smoothness
with zero gap (no coatings)
under perpendicular force vector (90-degree angle)
at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

Please note that the working load may be lower depending on elements below, in order of importance:

Clearance – existence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
Angle of force application – highest force is reached only during perpendicular pulling. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.

H&S for magnets

Allergy Warning

It is widely known that nickel (the usual finish) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands and opt for encased magnets.

This is not a toy

Always store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.

Maximum temperature

Watch the temperature. Exposing the magnet above 80 degrees Celsius will permanently weaken its properties and pulling force.

Electronic devices

Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, mechanical watches).

Pacemakers

People with a pacemaker should keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Magnetic interference

An intense magnetic field interferes with the functioning of magnetometers in phones and GPS navigation. Do not bring magnets near a device to prevent damaging the sensors.

Flammability

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this may cause fire.

Immense force

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

Magnet fragility

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Bodily injuries

Mind your fingers. Two large magnets will join instantly with a force of massive weight, crushing anything in their path. Be careful!

Warning! Learn more about hazards in the article: Safety of working with magnets.

MPL 80x40x15 / N38 - lamellar magnet

Do you have a hard time selecting?

MPL 80x40x15 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - technical parameters

1. Wall mount (shear)

2. Efficiency vs thickness

3. Heat tolerance

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

Material specification

Ecology and recycling (GPSR)

Magnet pull force

Magnetic Field

See also offers

UMC 42x7/4x9 / N38 - cylindrical magnetic holder

UMP 107x40 [M8+M10] GW F 400 kg / N38 - search holder

NCM 20x13.5x5 / N38 - channel magnetic holder

MP 30x6x10 / N38 - ring magnet

Pros and cons of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

Maximum holding power of the magnet – what contributes to it?

Key elements affecting lifting force

Allergy Warning

This is not a toy

Maximum temperature

Electronic devices

Pacemakers

Magnetic interference

Flammability

Immense force

Magnet fragility

Bodily injuries

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros and cons of Nd₂Fe₁₄B magnets.