Product available Ships tomorrow

MPL 20x20x20 / 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 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

Technical modeling of the magnet - report

Presented values are the outcome of a engineering simulation. Results were calculated on algorithms for the class NdFeB. Real-world performance may differ from theoretical values. Treat these data as a supplementary guide during assembly planning.

Table 1: Static pull force (force vs distance) - power drop
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	medium risk
5 mm	3114 Gs 311.4 mT	5.12 kg / 5120.3 g 50.2 N	medium risk
10 mm	1671 Gs 167.1 mT	1.48 kg / 1475.0 g 14.5 N	low risk
15 mm	936 Gs 93.6 mT	0.46 kg / 463.0 g 4.5 N	low risk
20 mm	562 Gs 56.2 mT	0.17 kg / 167.1 g 1.6 N	low risk
30 mm	244 Gs 24.4 mT	0.03 kg / 31.3 g 0.3 N	low risk
50 mm	73 Gs 7.3 mT	0.00 kg / 2.8 g 0.0 N	low risk

Grip strength decreases sharply per each millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, veneer) significantly weakens the grip. Magnets operate optimally during direct contact; gap weakens the power. Observe how quickly the pull force fall, when the product does not touch flatly to the steel surface. When planning the mounting, discard redundant distances.

Table 2: Vertical Load (Vertical Surface)
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 estimated weight limit necessary to cause the shifting of the magnet down on a upright steel wall (considering standard friction coefficient). The holding force is a function of the separation distance between the magnet and the metal.

Table 3: Wall mounting (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 placing a holder on a upright wall (e.g., a board), it you can count on barely approx. 20%-30% of its nominal power. Gravity as well as a weak degree of grip cause that magnets move down easier than they pull off. Designing a wall mount? Consider that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the holder will slip down under a significantly smaller load. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Material efficiency (saturation) - power losses
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 sheet is incapable of focus the entire magnetic field, which weakens actual performance of the magnet. If you mount a strong magnet to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To achieve full efficiency of this magnet's potential, you need a suitably thick element of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel dimension according to the table below.

Table 5: Thermal stability (stability) - resistance threshold
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

Classic neodymiums irreversibly lose parameters above the temperature limit. Protect against heat – high temperature can irreversibly damage this product. As the temperature rises, the magnet's force temporarily lowers. Avoid using this product in hot environments exceeding its working range. Ignoring the limit will lead to permanent loss of magnetic properties.

*Engineering note: Heat tolerance depends not only on the material grade, as well as the dimension ratios. Thin magnets (low Pc) are more susceptible to demagnetization sooner than taller cylinders. Warning indicator in the table indicates a risk of irreversible loss for this specific geometry.

Table 6: Two magnets (repulsion) - field range
MPL 20x20x20 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	20.28 kg / 20280 g 199.0 N 12 394 Gs	N/A
1 mm	12.73 kg / 12732 g 124.9 N 10 316 Gs	11.46 kg / 11459 g 112.4 N ~0 Gs
2 mm	10.33 kg / 10328 g 101.3 N 9 821 Gs	9.30 kg / 9295 g 91.2 N ~0 Gs
3 mm	8.26 kg / 8258 g 81.0 N 9 329 Gs	7.43 kg / 7432 g 72.9 N ~0 Gs
5 mm	5.12 kg / 5120 g 50.2 N 8 371 Gs	4.61 kg / 4608 g 45.2 N ~0 Gs
10 mm	1.48 kg / 1475 g 14.5 N 6 228 Gs	1.33 kg / 1328 g 13.0 N ~0 Gs
20 mm	0.17 kg / 167 g 1.6 N 3 343 Gs	0.15 kg / 150 g 1.5 N ~0 Gs
50 mm	0.00 kg / 3 g 0.0 N 721 Gs	0.00 kg / 0 g 0.0 N ~0 Gs

Two magnetic products attract each other from a wider radius than a magnet and sheet setup. Such a system of magnet-to-magnet generates a stronger field and a further horizon of action. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Exercise caution that when bringing together two magnets, the collision energy is massive. The repulsion force is marginally weaker than the attraction, but still large.
*Field value between like poles reaches ~0 Gs at the geometric center of the gap (due to field cancellation).

Table 7: Hazards (implants) - precautionary measures
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
Mobile device	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

A strong magnetic field poses a real danger to electronics and pacemakers. These NdFeB products produce a field that disrupts operation of digital equipment. Be aware: the invisible magnetic field acts through matter and glass. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Also at risk are: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

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

Magnetic elements are prone to chipping – a strong collision with metal risks their cracking. Watch the impact speed – a neodymium left loose turns into a projectile. Striking energy can cause material chips or injury to skin. Always hold the magnet during mounting so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the magnet. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
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)

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

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

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

Flux value emitted by the magnet pole. Essential parameter for motor design and Hall effect devices. Pc Factor defines the magnet operating point.

Table 11: Underwater work (magnet fishing)
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: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.

In water, the magnet feels stronger thanks to Archimedes' principle. However, remember the water resistance when pulling the rope quickly.

Magnet Unit Converter

Force (Pull)

Force in lbs

Magnetic Induction

Input your figure into any field, to see the rest will update instantly.

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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 20x20x20 mm and a weight of 60 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 15.40 kg), this product is available immediately 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 strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 20x20x20 / 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 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.

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 clean and degrease 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. In practice, this means that this magnet has the greatest attraction force on its main planes (20x20 mm), which is ideal for flat mounting. 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. It is a magnetic block with dimensions 20x20x20 mm and a self-weight of 60 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros and cons of NdFeB magnets.

Besides their exceptional pulling force, neodymium magnets offer the following advantages:

They retain attractive force for around 10 years – the loss is just ~1% (in theory),
Magnets effectively protect themselves against demagnetization caused by external fields,
The use of an refined coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
They are known for high magnetic induction at the operating surface, which increases their power,
Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
In view of the ability of free forming and adaptation to specialized requirements, magnetic components can be modeled in a variety of geometric configurations, which makes them more universal,
Fundamental importance in modern technologies – they are utilized in mass storage devices, electromotive mechanisms, advanced medical instruments, also multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which enables their usage in miniature devices

Disadvantages of neodymium magnets:

Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
Neodymium magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
Limited ability of producing threads in the magnet and complex shapes - recommended is casing - magnet mounting.
Health risk resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child health protection. It is also worth noting that small components of these devices can be problematic in diagnostics medical in case of swallowing.
High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum magnetic pulling force – what it depends on?

The declared magnet strength concerns the limit force, recorded under laboratory conditions, meaning:

with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
with a thickness minimum 10 mm
characterized by lack of roughness
with direct contact (no impurities)
under perpendicular application of breakaway force (90-degree angle)
at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

Real force is affected by working environment parameters, mainly (from priority):

Clearance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
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 pure iron steel. Hardened steels may have worse magnetic properties.
Surface finish – full contact is obtained only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
Temperature – heating the magnet results in weakening of force. It is worth remembering the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Nickel allergy

Some people suffer from a hypersensitivity to Ni, which is the common plating for neodymium magnets. Prolonged contact may cause dermatitis. We suggest use protective gloves.

Do not drill into magnets

Mechanical processing of NdFeB material poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.

Keep away from computers

Very strong magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets will cause them cracking into small pieces.

Demagnetization risk

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Caution required

Exercise caution. Rare earth magnets act from a long distance and connect with huge force, often faster than you can move away.

Threat to navigation

GPS units and smartphones are highly sensitive to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Danger to the youngest

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Store out of reach of kids and pets.

Pinching danger

Pinching hazard: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Implant safety

People with a ICD should keep an absolute distance from magnets. The magnetic field can disrupt the operation of the implant.

Security!

Want to know more? Read our article: Why are neodymium magnets dangerous?

MPL 20x20x20 / N38 - lamellar magnet

MPL 20x20x20 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical modeling of the magnet - report

Force (Pull)

Magnetic Induction

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Pros and cons of NdFeB magnets.

Maximum magnetic pulling force – what it depends on?

Practical aspects of lifting capacity – factors

H&S for magnets

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C