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MPL 40x10x18 / 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 020149

GTIN: 5906301811558

length

40 mm [±0,1 mm]

Width

10 mm [±0,1 mm]

Height

18 mm [±0,1 mm]

Weight

54 g

Magnetization Direction

→ diametrical

Load capacity

16.72 kg / 164.01 N

Magnetic Induction

540.48 mT / 5405 Gs

Coating

[NiCuNi] Nickel

18.45 ZŁ with VAT / pcs + price for transport

15.00 ZŁ net + 23% VAT / pcs

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MPL 40x10x18 / N38 - lamellar magnet

Specification / characteristics MPL 40x10x18 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020149
GTIN	5906301811558
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	18 mm [±0,1 mm]
Weight	54 g
Magnetization Direction	→ diametrical
Load capacity ~ ?	16.72 kg / 164.01 N
Magnetic Induction ~ ?	540.48 mT / 5405 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 40x10x18 / N38 - lamellar magnet

properties	values	units
remenance Br [Min. - Max.] ?	12.2-12.6	kGs
remenance Br [Min. - Max.] ?	1220-1260	T
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 106	°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 - technical parameters

The following data represent the outcome of a mathematical calculation. Results were calculated on models for the class Nd₂Fe₁₄B. Real-world performance may deviate from the simulation results. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (pull vs distance) - power drop
MPL 40x10x18 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5402 Gs 540.2 mT	16.72 kg / 16720.0 g 164.0 N	dangerous!
1 mm	4664 Gs 466.4 mT	12.46 kg / 12464.6 g 122.3 N	dangerous!
2 mm	3970 Gs 397.0 mT	9.03 kg / 9028.7 g 88.6 N	strong
3 mm	3362 Gs 336.2 mT	6.48 kg / 6476.4 g 63.5 N	strong
5 mm	2432 Gs 243.2 mT	3.39 kg / 3388.5 g 33.2 N	strong
10 mm	1220 Gs 122.0 mT	0.85 kg / 853.2 g 8.4 N	weak grip
15 mm	703 Gs 70.3 mT	0.28 kg / 282.9 g 2.8 N	weak grip
20 mm	440 Gs 44.0 mT	0.11 kg / 111.1 g 1.1 N	weak grip
30 mm	203 Gs 20.3 mT	0.02 kg / 23.6 g 0.2 N	weak grip
50 mm	64 Gs 6.4 mT	0.00 kg / 2.4 g 0.0 N	weak grip

Pulling power weakens significantly with every subsequent millimeter of distance. Note that every additional insulation layer (e.g., contamination, paint, rust) noticeably diminishes the holding power. Magnets work strongest during direct contact; air break weakens the power. Analyze how flashily the load capacity drop, when the magnet does not adhere tightly to the steel surface. When calculating the arrangement, eliminate redundant distances.

Table 2: Slippage Load (Vertical Surface)
MPL 40x10x18 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	3.34 kg / 3344.0 g 32.8 N
1 mm	Stal (~0.2)	2.49 kg / 2492.0 g 24.4 N
2 mm	Stal (~0.2)	1.81 kg / 1806.0 g 17.7 N
3 mm	Stal (~0.2)	1.30 kg / 1296.0 g 12.7 N
5 mm	Stal (~0.2)	0.68 kg / 678.0 g 6.7 N
10 mm	Stal (~0.2)	0.17 kg / 170.0 g 1.7 N
15 mm	Stal (~0.2)	0.06 kg / 56.0 g 0.5 N
20 mm	Stal (~0.2)	0.02 kg / 22.0 g 0.2 N
30 mm	Stal (~0.2)	0.00 kg / 4.0 g 0.0 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data indicates the approximate holding capacity sufficient to initiate the slippage of the magnet vertically on a upright steel plate (assuming typical friction coefficient). The holding force depends on the distance between the magnet and the metal.

Table 3: Wall mounting (sliding) - vertical pull
MPL 40x10x18 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.02 kg / 5016.0 g 49.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.34 kg / 3344.0 g 32.8 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.67 kg / 1672.0 g 16.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	8.36 kg / 8360.0 g 82.0 N

When hanging a magnet on a upright wall (e.g., a fridge), it will only hold only about 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that holders slide down easier than they pull off. Want to create a wall mount? Note that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a noticeably lighter load. Application of an anti-slip coating can effectively raise the stability.

Table 4: Steel thickness (substrate influence) - power losses
MPL 40x10x18 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.84 kg / 836.0 g 8.2 N
1 mm	13%	2.09 kg / 2090.0 g 20.5 N
2 mm	25%	4.18 kg / 4180.0 g 41.0 N
5 mm	63%	10.45 kg / 10450.0 g 102.5 N
10 mm	100%	16.72 kg / 16720.0 g 164.0 N

A thin sheet is not enough to conduct the full magnetic flux, which squanders power of the holder. Should you mount a strong magnet to a thin surface, the flux will penetrate right through and the pull force will drop sharply. To achieve 100% of this magnet's potential, you require a sufficiently solid element of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the holder works worse. We advise picking the steel cross-section from these parameters.

Table 5: Thermal resistance (material behavior) - thermal limit
MPL 40x10x18 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	16.72 kg / 16720.0 g 164.0 N	OK
40 °C	-2.2%	16.35 kg / 16352.2 g 160.4 N	OK
60 °C	-4.4%	15.98 kg / 15984.3 g 156.8 N	OK
80 °C	-6.6%	15.62 kg / 15616.5 g 153.2 N
100 °C	-28.8%	11.90 kg / 11904.6 g 116.8 N

Standard neodymium magnets lose strength above the temperature limit. Avoid high temperatures – heat can permanently destroy this magnet. With increasing heat, the neodymium's force temporarily drops. Refrain from using this product in hot environments exceeding its working range. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low Pc) are more susceptible to demagnetization at lower temperatures than taller cylinders. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 40x10x18 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	71.96 kg / 71962 g 705.9 N 5 928 Gs	N/A
1 mm	62.49 kg / 62486 g 613.0 N 10 068 Gs	56.24 kg / 56237 g 551.7 N ~0 Gs
2 mm	53.65 kg / 53647 g 526.3 N 9 328 Gs	48.28 kg / 48282 g 473.6 N ~0 Gs
3 mm	45.76 kg / 45759 g 448.9 N 8 615 Gs	41.18 kg / 41183 g 404.0 N ~0 Gs
5 mm	32.92 kg / 32921 g 323.0 N 7 308 Gs	29.63 kg / 29629 g 290.7 N ~0 Gs
10 mm	14.58 kg / 14584 g 143.1 N 4 864 Gs	13.13 kg / 13125 g 128.8 N ~0 Gs
20 mm	3.67 kg / 3672 g 36.0 N 2 441 Gs	3.30 kg / 3305 g 32.4 N ~0 Gs
50 mm	0.21 kg / 211 g 2.1 N 585 Gs	0.19 kg / 190 g 1.9 N ~0 Gs

Two magnetic products attract each other from a wider radius than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of operation. Want to build a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the collision energy is extreme. The repulsion force is marginally weaker than the attraction, but still impressive.
*Flux density in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Protective zones (implants) - precautionary measures
MPL 40x10x18 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	13.5 cm
Hearing aid	10 Gs (1.0 mT)	10.5 cm
Mechanical watch	20 Gs (2.0 mT)	8.0 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.5 cm
Car key	50 Gs (5.0 mT)	6.0 cm
Payment card	400 Gs (40.0 mT)	2.5 cm
HDD hard drive	600 Gs (60.0 mT)	2.0 cm

Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These magnets produce a flux that destroys function of sensitive medical devices. Remember: the invisible magnetic field acts through matter and glass. Exceptional care must be exercised by people with hearing aids and drug dispensers. Influence will be felt by: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 40x10x18 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	18.30 km/h (5.08 m/s)	0.70 J
30 mm	30.76 km/h (8.55 m/s)	1.97 J
50 mm	39.69 km/h (11.02 m/s)	3.28 J
100 mm	56.12 km/h (15.59 m/s)	6.56 J

NdFeB products are very brittle – a violent impact against metal risks their cracking. Control the attraction moment – a magnet released freely becomes dangerous. Striking energy can cause material chips or painful pinches to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the metal. A collision at high speed means shattering of the neodymium. Wear eye protection when handling with powerful specimens.

Table 9: Corrosion resistance
MPL 40x10x18 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Design data (Flux)
MPL 40x10x18 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	21 285 Mx	212.9 µWb
Współczynnik Pc	0.79	Wysoki (Stabilny)

Flux value emitted by the magnet pole. Key data for generator builders and sensors. Pc Factor determines the magnet operating point.

Table 11: Underwater work (magnet fishing)
MPL 40x10x18 / N38

Environment	Effective steel pull	Effect
Air (land)	16.72 kg	Standard
Water (riverbed)	19.14 kg (+2.42 kg Buoyancy gain)	+14.5%

Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.

The magnetic field penetrates through water without any losses. Buoyancy helps in lifting finds.

1. Shear force

*Note: On a vertical surface, the magnet holds just approx. 20-30% of its nominal pull.

2. Steel thickness impact

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

3. Temperature resistance

*For standard magnets, the critical limit is 80°C.

Quick Unit Converter

Magnet Pull Force

Pounds (lbs)

Field Strength

Gauss (Gs)

Simply complete any input, and the tool compute everything else automatically.

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MPL 25x12.5x5 / N38 - lamellar magnet

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This product is an extremely strong magnet in the shape of a plate made of NdFeB material, which, with dimensions of 40x10x18 mm and a weight of 54 g, guarantees the highest quality connection. This magnetic block with a force of 164.01 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 sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. Watch your fingers! Magnets with a force of 16.72 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

They constitute a key element in the production of generators and material handling systems. Thanks to the flat surface and high force (approx. 16.72 kg), they are ideal as closers in furniture making and mounting elements in automation. Customers often choose this model for workshop organization 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).

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. 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), 10 mm (width), and 18 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 16.72 kg (force ~164.01 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.

Pros

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

They do not lose magnetism, even after around ten years – the drop in lifting capacity is only ~1% (based on measurements),
They are extremely resistant to demagnetization induced by presence of other magnetic fields,
Thanks to the elegant finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
Magnetic induction on the working layer of the magnet remains very high,
Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
Thanks to modularity in forming and the capacity to modify to individual projects,
Universal use in future technologies – they are commonly used in mass storage devices, motor assemblies, diagnostic systems, and industrial machines.
Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Weaknesses

Disadvantages of neodymium magnets:

Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises 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 advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
We recommend casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices can disrupt the diagnostic process medical after entering the body.
Due to neodymium price, their price is higher than average,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

The declared magnet strength concerns the limit force, obtained under optimal environment, namely:

on a block made of mild steel, perfectly concentrating the magnetic field
with a thickness no less than 10 mm
characterized by lack of roughness
without any clearance between the magnet and steel
for force acting at a right angle (in the magnet axis)
in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the working load will differ depending on the following factors, starting with the most relevant:

Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the power to be wasted into the air.
Chemical composition of the base – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet and the plate lowers the holding force.

Precautions when working with neodymium magnets

Handling rules

Exercise caution. Neodymium magnets attract from a long distance and connect with massive power, often faster than you can move away.

Operating temperature

Do not overheat. Neodymium magnets are sensitive to heat. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Health Danger

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or ask another person to handle the magnets.

No play value

Adult use only. Tiny parts can be swallowed, causing intestinal necrosis. Store out of reach of kids and pets.

Bodily injuries

Large magnets can break fingers instantly. Never place your hand betwixt two attracting surfaces.

Compass and GPS

A powerful magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a device to avoid breaking the sensors.

Electronic devices

Very strong magnetic fields can corrupt files on payment cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Do not drill into magnets

Fire warning: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Magnet fragility

Beware of splinters. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Eye protection is mandatory.

Sensitization to coating

A percentage of the population have a contact allergy to nickel, which is the standard coating for NdFeB magnets. Prolonged contact may cause skin redness. We recommend wear protective gloves.

Danger! Want to know more? Read our article: Are neodymium magnets dangerous?

MPL 40x10x18 / N38 - lamellar magnet

Not sure where to buy?

MPL 40x10x18 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical simulation of the assembly - technical parameters

1. Shear force

2. Steel thickness impact

3. Temperature resistance

Magnet Pull Force

Field Strength

Other products

MPL 20x10x1 / N38 - lamellar magnet

MPL 11x11x1 / N38 - lamellar magnet

MPL 40x10x5 / N38 - lamellar magnet

MPL 25x12.5x5 / N38 - lamellar magnet

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Weaknesses

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

Impact of factors on magnetic holding capacity in practice

Handling rules

Operating temperature

Health Danger

No play value

Bodily injuries

Compass and GPS

Electronic devices

Do not drill into magnets

Magnet fragility

Sensitization to coating

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Advantages as well as disadvantages of Nd₂Fe₁₄B magnets.