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MPL 20x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020129

GTIN: 5906301811350

5.00

length

20 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

60 g

Magnetization Direction

↑ axial

Load capacity

15.40 kg / 151.12 N

Magnetic Induction

540.22 mT / 5402 Gs

Coating

[NiCuNi] Nickel

33.21 ZŁ with VAT / pcs + price for transport

27.00 ZŁ net + 23% VAT / pcs

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MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics MPL 20x20x20 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020129
GTIN	5906301811350
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	20 mm [±0,1 mm]
Width	20 mm [±0,1 mm]
Height	20 mm [±0,1 mm]
Weight	60 g
Magnetization Direction	↑ axial
Load capacity ~ ?	15.40 kg / 151.12 N
Magnetic Induction ~ ?	540.22 mT / 5402 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 20x20x20 / 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

Engineering simulation of the assembly - data

The following values are the result of a mathematical calculation. Values were calculated on models for the material Nd₂Fe₁₄B. Actual performance might slightly deviate from the simulation results. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs gap) - interaction chart
MPL 20x20x20 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	5400 Gs 540.0 mT	15.40 kg / 15400.0 g 151.1 N	critical level
1 mm	4910 Gs 491.0 mT	12.73 kg / 12732.2 g 124.9 N	critical level
2 mm	4423 Gs 442.3 mT	10.33 kg / 10328.3 g 101.3 N	critical level
3 mm	3955 Gs 395.5 mT	8.26 kg / 8258.3 g 81.0 N	warning
5 mm	3114 Gs 311.4 mT	5.12 kg / 5120.3 g 50.2 N	warning
10 mm	1671 Gs 167.1 mT	1.48 kg / 1475.0 g 14.5 N	safe
15 mm	936 Gs 93.6 mT	0.46 kg / 463.0 g 4.5 N	safe
20 mm	562 Gs 56.2 mT	0.17 kg / 167.1 g 1.6 N	safe
30 mm	244 Gs 24.4 mT	0.03 kg / 31.3 g 0.3 N	safe
50 mm	73 Gs 7.3 mT	0.00 kg / 2.8 g 0.0 N	safe

Magnetic force weakens significantly with every subsequent millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, paint, dust) significantly reduces the pull force. Magnetic products operate optimally in perfect adhesion; air break drastically cuts the power. Notice how quickly the load capacity plummet, when the product does not adhere flatly to the steel surface. When planning the arrangement, avoid additional spacers.

Table 2: Sliding Capacity (Wall)
MPL 20x20x20 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	3.08 kg / 3080.0 g 30.2 N
1 mm	Stal (~0.2)	2.55 kg / 2546.0 g 25.0 N
2 mm	Stal (~0.2)	2.07 kg / 2066.0 g 20.3 N
3 mm	Stal (~0.2)	1.65 kg / 1652.0 g 16.2 N
5 mm	Stal (~0.2)	1.02 kg / 1024.0 g 10.0 N
10 mm	Stal (~0.2)	0.30 kg / 296.0 g 2.9 N
15 mm	Stal (~0.2)	0.09 kg / 92.0 g 0.9 N
20 mm	Stal (~0.2)	0.03 kg / 34.0 g 0.3 N
30 mm	Stal (~0.2)	0.01 kg / 6.0 g 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 0.0 g 0.0 N

The following data shows the approximate shear load needed to start the slippage of the magnet down along a upright steel wall (assuming standard friction coefficient). This parameter is a function of the air gap between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 20x20x20 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	4.62 kg / 4620.0 g 45.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.08 kg / 3080.0 g 30.2 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.54 kg / 1540.0 g 15.1 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	7.70 kg / 7700.0 g 75.5 N

When hanging a element on a upright surface (e.g., a car body), it will maintain only approx. 1/5 of its maximum pull force. Gravitational force as well as a weak degree of grip cause that magnets move down faster than they pop off the substrate. Designing a hanger? Consider that the shear force is significantly lower than the perpendicular breakaway force. On a painted metal, the magnet will slip down under a noticeably lighter cargo. Using a rubber pad can significantly increase the grip.

Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 20x20x20 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.77 kg / 770.0 g 7.6 N
1 mm	13%	1.93 kg / 1925.0 g 18.9 N
2 mm	25%	3.85 kg / 3850.0 g 37.8 N
5 mm	63%	9.63 kg / 9625.0 g 94.4 N
10 mm	100%	15.40 kg / 15400.0 g 151.1 N

A thin metal plate is incapable of focus the full magnetic flux, which squanders power of the magnet. If you attach a powerful product to a thin surface, the field will penetrate right through and the pull force will drop sharply. To achieve full efficiency of this neodymium's power, you require a sufficiently solid piece of metal. The material oversaturation causes that on thin elements (e.g., thin profiles), the product holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal resistance (material behavior) - power drop
MPL 20x20x20 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	15.40 kg / 15400.0 g 151.1 N	OK
40 °C	-2.2%	15.06 kg / 15061.2 g 147.8 N	OK
60 °C	-4.4%	14.72 kg / 14722.4 g 144.4 N	OK
80 °C	-6.6%	14.38 kg / 14383.6 g 141.1 N
100 °C	-28.8%	10.96 kg / 10964.8 g 107.6 N

Standard neodymium magnets irreversibly lose parameters past the thermal threshold. Watch out for overheating – heat can permanently damage this product. As the temperature rises, the magnet's power momentarily drops. Avoid using this magnet close to heaters higher than its operating temperature limit. Too high temperature will result in destruction of magnetic properties.

*Technical advisory: Temperature resistance depends not only on the material grade, and the Permeance Coefficient Pc. Flat magnets (low permeance coefficient) risk losing magnetic properties under lower heat stress than taller cylinders. The danger warning in the table points to a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 20x20x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	71.92 kg / 71917 g 705.5 N 5 962 Gs	N/A
1 mm	65.60 kg / 65602 g 643.6 N 10 316 Gs	59.04 kg / 59042 g 579.2 N ~0 Gs
2 mm	59.46 kg / 59458 g 583.3 N 9 821 Gs	53.51 kg / 53513 g 525.0 N ~0 Gs
3 mm	53.66 kg / 53658 g 526.4 N 9 329 Gs	48.29 kg / 48293 g 473.8 N ~0 Gs
5 mm	43.20 kg / 43199 g 423.8 N 8 371 Gs	38.88 kg / 38879 g 381.4 N ~0 Gs
10 mm	23.91 kg / 23912 g 234.6 N 6 228 Gs	21.52 kg / 21520 g 211.1 N ~0 Gs
20 mm	6.89 kg / 6888 g 67.6 N 3 343 Gs	6.20 kg / 6199 g 60.8 N ~0 Gs
50 mm	0.32 kg / 320 g 3.1 N 721 Gs	0.29 kg / 288 g 2.8 N ~0 Gs

Two magnetic products attract each other from a much further distance than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a wider radius of performance. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the pinch force is massive. The levitation is a bit weaker than the connection force, but still impressive.
*Field value for N-N configuration is approximately ~0 Gs in the exact middle between the magnets (caused by magnetic field nullification).

Table 7: Safety (HSE) (implants) - warnings
MPL 20x20x20 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	14.0 cm
Hearing aid	10 Gs (1.0 mT)	11.0 cm
Timepiece	20 Gs (2.0 mT)	8.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.5 cm
Remote	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

A strong magnetic field is a real danger to electronic devices as well as medical implants. These magnets produce a field that disrupts operation of digital equipment. Be aware: the unseen radiation acts through matter and glass. Special caution must be exercised by people with hearing aids and drug dispensers. Also at risk are: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or precise measuring instruments.

Table 8: Impact energy (cracking risk) - warning
MPL 20x20x20 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	17.10 km/h (4.75 m/s)	0.68 J
30 mm	28.02 km/h (7.78 m/s)	1.82 J
50 mm	36.13 km/h (10.04 m/s)	3.02 J
100 mm	51.09 km/h (14.19 m/s)	6.04 J

Neodymium magnets are very brittle – a strong collision with metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Striking energy can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed ends with a crack of the magnet. Wear eye protection when playing with powerful specimens.

Table 9: Corrosion resistance
MPL 20x20x20 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 20x20x20 / N38

Parameter	Value	Jedn. SI / Opis
Strumień (Flux)	22 017 Mx	220.2 µWb
Współczynnik Pc	0.84	Wysoki (Stabilny)

Total magnetic flux flowing through the magnet pole. Key data for generator builders and Hall effect devices. Pc Factor determines the magnet operating point.

Table 11: Physics of underwater searching
MPL 20x20x20 / N38

Environment	Effective steel pull	Effect
Air (land)	15.40 kg	Standard
Water (riverbed)	17.63 kg (+2.23 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!

Water displaces steel, making heavy objects slightly lighter. Buoyancy helps in lifting finds.

1. Sliding resistance

*Warning: On a vertical wall, the magnet retains merely ~20% of its nominal pull.

2. Steel saturation

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

3. Temperature resistance

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

Magnet Unit Converter

Magnet Pull Force

Force (N)

lbs

Magnetic Field

Simply complete one field, to let the tool calculate the rest instantly.

Other proposals

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10.46 ZŁ brutto / pcs

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13.95 ZŁ brutto / pcs

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MW 8x5 / N38 - cylindrical magnet

0.836 ZŁ brutto / pcs

Component MPL 20x20x20 / N38 features a flat shape and industrial pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 15.40 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.

Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. Watch your fingers! Magnets with a force of 15.40 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.

Plate magnets MPL 20x20x20 / 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.

For mounting flat magnets MPL 20x20x20 / N38, it is best to use 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).

Standardly, the MPL 20x20x20 / N38 model is magnetized through the thickness (dimension 20 mm), which means that the N and S poles are located on its largest, flat surfaces. 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 20x20x20 mm, which, at a weight of 60 g, makes it an element with high energy density. The key parameter here is the lifting capacity amounting to approximately 15.40 kg (force ~151.12 N), which, with such a compact shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of neodymium magnets.

Pros

Apart from their consistent power, neodymium magnets have these key benefits:

Their strength remains stable, and after around ten years it drops only by ~1% (theoretically),
Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by magnetic disturbances,
Thanks to the glossy finish, the layer of nickel, gold, or silver-plated gives an visually attractive appearance,
They are known for high magnetic induction at the operating surface, which improves attraction properties,
Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to versatility in constructing and the ability to adapt to individual projects,
Key role in innovative solutions – they are commonly used in mass storage devices, electric drive systems, diagnostic systems, also modern systems.
Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which makes them useful in miniature devices

Limitations

What to avoid - cons of neodymium magnets: weaknesses and usage proposals

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 protects them against impacts but also raises their durability
When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
Due to limitations in creating threads and complex shapes in magnets, we propose using a housing - magnetic mechanism.
Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical in case of swallowing.
With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Breakaway force was determined for the most favorable conditions, including:

with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
with a thickness minimum 10 mm
with a surface cleaned and smooth
without the slightest clearance between the magnet and steel
during pulling in a direction vertical to the mounting surface
in neutral thermal conditions

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity depends on many variables, ranked from crucial:

Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by varnish or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of nominal force).
Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
Material composition – not every steel reacts the same. Alloy additives weaken the interaction with the magnet.
Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was determined by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Additionally, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Safe handling of neodymium magnets

Immense force

Before use, read the rules. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.

Pacemakers

Warning for patients: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Cards and drives

Device Safety: Neodymium magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).

Allergy Warning

Allergy Notice: The Ni-Cu-Ni coating consists of nickel. If redness occurs, immediately stop working with magnets and use protective gear.

Eye protection

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

Product not for children

Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of kids and pets.

Crushing risk

Risk of injury: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.

Impact on smartphones

Navigation devices and smartphones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the sensors in your phone.

Power loss in heat

Avoid heat. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, ask us about HT versions (H, SH, UH).

Dust explosion hazard

Dust created during cutting of magnets is combustible. Avoid drilling into magnets unless you are an expert.

Attention! Details about hazards in the article: Magnet Safety Guide.

MPL 20x20x20 / N38 - lamellar magnet

Can't decide what to choose?

MPL 20x20x20 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Engineering simulation of the assembly - data

1. Sliding resistance

2. Steel saturation

3. Temperature resistance

Magnet Pull Force

Magnetic Field

Other proposals

MW 25x12 / N38 - cylindrical magnet

UMGGW 43x6 [M4] GW / N38 - magnetic holder rubber internal thread

MP 22x6x10 / N38 - ring magnet

MW 8x5 / N38 - cylindrical magnet

Pros and cons of neodymium magnets.

Pros

Limitations

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Practical aspects of lifting capacity – factors

Immense force

Pacemakers

Cards and drives

Allergy Warning

Eye protection

Product not for children

Crushing risk

Impact on smartphones

Power loss in heat

Dust explosion hazard

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C