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MPL 100x40x20 / 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 020109

GTIN/EAN: 5906301811152

5.00

length

100 mm [±0,1 mm]

Width

40 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

600 g

Magnetization Direction

↑ axial

Load capacity

120.01 kg / 1177.33 N

Magnetic Induction

337.24 mT / 3372 Gs

Coating

[NiCuNi] Nickel

335.30 ZŁ with VAT / pcs + price for transport

272.60 ZŁ net + 23% VAT / pcs

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MPL 100x40x20 / N38 - lamellar magnet

Specification / characteristics MPL 100x40x20 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020109
GTIN/EAN	5906301811152
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	100 mm [±0,1 mm]
Width	40 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	600 g
Magnetization Direction	↑ axial
Load capacity ~ ?	120.01 kg / 1177.33 N
Magnetic Induction ~ ?	337.24 mT / 3372 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 100x40x20 / 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

These data represent the result of a engineering simulation. Results rely on models for the material Nd₂Fe₁₄B. Real-world performance might slightly differ. Please consider these data as a reference point for designers.

Table 1: Static force (pull vs distance) - power drop
MPL 100x40x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3372 Gs 337.2 mT	120.01 kg / 120010.0 g 1177.3 N	crushing
1 mm	3268 Gs 326.8 mT	112.70 kg / 112695.4 g 1105.5 N	crushing
2 mm	3158 Gs 315.8 mT	105.27 kg / 105272.6 g 1032.7 N	crushing
3 mm	3046 Gs 304.6 mT	97.92 kg / 97921.3 g 960.6 N	crushing
5 mm	2818 Gs 281.8 mT	83.78 kg / 83783.3 g 821.9 N	crushing
10 mm	2266 Gs 226.6 mT	54.17 kg / 54174.5 g 531.5 N	crushing
15 mm	1794 Gs 179.4 mT	33.96 kg / 33955.7 g 333.1 N	crushing
20 mm	1419 Gs 141.9 mT	21.25 kg / 21248.1 g 208.4 N	crushing
30 mm	908 Gs 90.8 mT	8.70 kg / 8696.3 g 85.3 N	strong
50 mm	416 Gs 41.6 mT	1.83 kg / 1825.4 g 17.9 N	safe

Pulling power weakens significantly with every mm of gap. Note that even the smallest gap (e.g., contamination, varnish, dust) significantly weakens the grip. Neodymiums hold strongest in perfect adhesion; gap nullifies the force. Notice how flashily the parameters plummet, when the product does not adhere tightly to the metal substrate. When designing the arrangement, avoid additional spacers.

Table 2: Shear capacity (vertical surface)
MPL 100x40x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	24.00 kg / 24002.0 g 235.5 N
1 mm	Stal (~0.2)	22.54 kg / 22540.0 g 221.1 N
2 mm	Stal (~0.2)	21.05 kg / 21054.0 g 206.5 N
3 mm	Stal (~0.2)	19.58 kg / 19584.0 g 192.1 N
5 mm	Stal (~0.2)	16.76 kg / 16756.0 g 164.4 N
10 mm	Stal (~0.2)	10.83 kg / 10834.0 g 106.3 N
15 mm	Stal (~0.2)	6.79 kg / 6792.0 g 66.6 N
20 mm	Stal (~0.2)	4.25 kg / 4250.0 g 41.7 N
30 mm	Stal (~0.2)	1.74 kg / 1740.0 g 17.1 N
50 mm	Stal (~0.2)	0.37 kg / 366.0 g 3.6 N

The table below indicates the estimated weight limit required to initiate the sliding of the magnet down against a vertical metal surface (considering standard friction). The holding force is relative to the separation distance between the magnet and the surface.

Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 100x40x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	36.00 kg / 36003.0 g 353.2 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	24.00 kg / 24002.0 g 235.5 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	12.00 kg / 12001.0 g 117.7 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	60.01 kg / 60005.0 g 588.6 N

When placing a element on a vertical surface (e.g., a fridge), it will maintain only about 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets slide down easier than they pull off. Designing a vertical fastening? Note that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller weight. Using a rubber pad can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 100x40x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	3%	4.00 kg / 4000.3 g 39.2 N
1 mm	8%	10.00 kg / 10000.8 g 98.1 N
2 mm	17%	20.00 kg / 20001.7 g 196.2 N
5 mm	42%	50.00 kg / 50004.2 g 490.5 N
10 mm	83%	100.01 kg / 100008.3 g 981.1 N

A thin sheet cannot conduct the entire magnetic field, which squanders power of the holder. If you mount a strong magnet to a too thin substrate, the field will pass right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you require a sufficiently solid backing of metal. The material oversaturation means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel cross-section based on the following data.

Table 5: Thermal resistance (stability) - power drop
MPL 100x40x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	120.01 kg / 120010.0 g 1177.3 N	OK
40 °C	-2.2%	117.37 kg / 117369.8 g 1151.4 N	OK
60 °C	-4.4%	114.73 kg / 114729.6 g 1125.5 N
80 °C	-6.6%	112.09 kg / 112089.3 g 1099.6 N
100 °C	-28.8%	85.45 kg / 85447.1 g 838.2 N

Standard neodymium magnets change their properties strength after exceeding the maximum temperature. Watch out for overheating – high temperature can irreversibly damage this product. With every degree above norm, the neodymium's capacity momentarily lowers. Refrain from using this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetism.

*Important note: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Thin magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 100x40x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	280.40 kg / 280403 g 2750.8 N 4 790 Gs	N/A
1 mm	271.97 kg / 271970 g 2668.0 N 6 642 Gs	244.77 kg / 244773 g 2401.2 N ~0 Gs
2 mm	263.31 kg / 263312 g 2583.1 N 6 535 Gs	236.98 kg / 236981 g 2324.8 N ~0 Gs
3 mm	254.63 kg / 254635 g 2498.0 N 6 427 Gs	229.17 kg / 229171 g 2248.2 N ~0 Gs
5 mm	237.35 kg / 237346 g 2328.4 N 6 205 Gs	213.61 kg / 213611 g 2095.5 N ~0 Gs
10 mm	195.76 kg / 195759 g 1920.4 N 5 635 Gs	176.18 kg / 176183 g 1728.4 N ~0 Gs
20 mm	126.58 kg / 126579 g 1241.7 N 4 531 Gs	113.92 kg / 113921 g 1117.6 N ~0 Gs
50 mm	31.47 kg / 31470 g 308.7 N 2 259 Gs	28.32 kg / 28323 g 277.8 N ~0 Gs

Two strong neodymiums interact from a much further distance than a neodymium and metal combination. The connection of magnet-to-magnet creates a more powerful interaction and a further horizon of performance. Want to build a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when attracting two neodymiums, the collision energy is massive. The levitation is slightly lower than the connection force, but still significant.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).

Table 7: Hazards (implants) - warnings
MPL 100x40x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	30.5 cm
Hearing aid	10 Gs (1.0 mT)	24.0 cm
Timepiece	20 Gs (2.0 mT)	18.5 cm
Mobile device	40 Gs (4.0 mT)	14.5 cm
Remote	50 Gs (5.0 mT)	13.5 cm
Payment card	400 Gs (40.0 mT)	5.5 cm
HDD hard drive	600 Gs (60.0 mT)	4.5 cm

A strong magnetic field poses a real danger to electronics as well as pacemakers. These magnets produce a field that destroys function of digital equipment. Be aware: the invisible magnetic field passes through tissues and glass. Special caution must be exercised by people with cochlear implants and insulin pumps. The risk also applies to: mechanical watches, remotes, membranes, and displays. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (kinetic energy) - warning
MPL 100x40x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.84 km/h (4.96 m/s)	7.37 J
30 mm	25.80 km/h (7.17 m/s)	15.41 J
50 mm	32.20 km/h (8.94 m/s)	23.99 J
100 mm	45.13 km/h (12.54 m/s)	47.14 J

Neodymium magnets are very brittle – a collision with steel risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Impact energy can destroy the magnet or injury to fingers. Hold the magnet firmly during mounting so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Use safety goggles when handling with powerful specimens.

Table 9: Corrosion resistance
MPL 100x40x20 / 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (P_c)
MPL 100x40x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	131 922 Mx	1319.2 µWb
P_c Coefficient	0.38	Low (Flat)

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

Table 11: Physics of underwater searching
MPL 100x40x20 / N38

Environment	Effective steel pull	Effect
Air (land)	120.01 kg	Standard
Water (riverbed)	137.41 kg (+17.40 kg Buoyancy gain)	+14.5%

Rust risk: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

Water displaces steel, making heavy objects slightly lighter. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Sliding resistance

*Note: On a vertical wall, the magnet holds only ~20% of its max power.

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, the safety limit is 80°C.

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.38

The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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

Chemical composition

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: 020109-2025

Measurement Calculator

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Force in kg

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Pounds (lbs)

Field Strength

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Component MPL 100x40x20 / 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 1177.33 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 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 120.01 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 100x40x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. They work great as fasteners under tiles, wood, or glass. 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. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Remember to roughen and wash the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.

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.

This model is characterized by dimensions 100x40x20 mm, which, at a weight of 600 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 100x40x20 mm and a self-weight of 600 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of Nd₂Fe₁₄B magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:

Their strength is maintained, and after around ten years it drops only by ~1% (according to research),
They show high resistance to demagnetization induced by external magnetic fields,
By covering with a decorative layer of gold, the element presents an elegant look,
They show high magnetic induction at the operating surface, which increases their power,
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...
Possibility of custom creating and optimizing to precise conditions,
Wide application in future technologies – they are used in computer drives, motor assemblies, precision medical tools, as well as modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Disadvantages

Disadvantages of neodymium magnets:

They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
We recommend casing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Lifting parameters

Highest magnetic holding force – what affects it?

Holding force of 120.01 kg is a measurement result conducted under specific, ideal conditions:

using a base made of low-carbon steel, serving as a circuit closing element
with a thickness no less than 10 mm
characterized by even structure
under conditions of ideal adhesion (metal-to-metal)
during detachment in a direction vertical to the mounting surface
at room temperature

Magnet lifting force in use – key factors

Effective lifting capacity is influenced by specific conditions, mainly (from most important):

Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Direction of force – maximum parameter is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
Material type – ideal substrate is high-permeability steel. Cast iron may attract less.
Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the holding force.

H&S for magnets

Caution required

Use magnets consciously. Their huge power can surprise even experienced users. Stay alert and do not underestimate their force.

Pacemakers

Patients with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

Metal Allergy

It is widely known that the nickel plating (standard magnet coating) is a common allergen. If your skin reacts to metals, prevent touching magnets with bare hands and choose versions in plastic housing.

Product not for children

Adult use only. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

Finger safety

Danger of trauma: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Threat to electronics

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Maintain a gap of min. 10 cm.

Machining danger

Fire warning: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Magnet fragility

Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Impact on smartphones

Remember: rare earth magnets generate a field that confuses precision electronics. Maintain a safe distance from your mobile, tablet, and navigation systems.

Permanent damage

Keep cool. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Danger! Learn more about risks in the article: Safety of working with magnets.

MPL 100x40x20 / N38 - lamellar magnet

Looking for a better price?

MPL 100x40x20 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - data

1. Sliding resistance

2. Efficiency vs thickness

3. Heat tolerance

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

Chemical composition

Ecology and recycling (GPSR)

Pulling force

Field Strength

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MPL 20x3x2 / N38 - lamellar magnet

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Pros as well as cons of Nd2Fe14B magnets.

Strengths

Disadvantages

Lifting parameters

Highest magnetic holding force – what affects it?

Magnet lifting force in use – key factors

Caution required

Pacemakers

Metal Allergy

Product not for children

Finger safety

Threat to electronics

Machining danger

Magnet fragility

Impact on smartphones

Permanent damage

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Pros as well as cons of Nd₂Fe₁₄B magnets.