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/EAN: 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

technical specifications »

33.21 ZŁ with VAT / pcs + price for transport

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Contact us by phone +48 22 499 98 98 alternatively send us a note using request form the contact form page.
Parameters along with shape of a neodymium magnet can be verified with our magnetic calculator.

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Product card - MPL 20x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 20x20x20 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020129
GTIN/EAN	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	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

Presented data represent the direct effect of a mathematical simulation. Results were calculated on algorithms for the material Nd₂Fe₁₄B. Real-world performance may differ. Please consider these data as a reference point for designers.

Table 1: Static force (pull 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	dangerous!
1 mm	4910 Gs 491.0 mT	12.73 kg / 12732.2 g 124.9 N	dangerous!
2 mm	4423 Gs 442.3 mT	10.33 kg / 10328.3 g 101.3 N	dangerous!
3 mm	3955 Gs 395.5 mT	8.26 kg / 8258.3 g 81.0 N	strong
5 mm	3114 Gs 311.4 mT	5.12 kg / 5120.3 g 50.2 N	strong
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 drops drastically per each millimeter of spacing. Keep in mind that even a very thin break (e.g., dirt, varnish, rust) significantly reduces the pull force. Magnets work most effectively in perfect adhesion; gap weakens the power. See how rapidly the pull force drop, when the magnet does not touch flatly to the metal substrate. When designing the mounting, eliminate redundant distances.

Table 2: Sliding force (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 table below presents the approximate holding capacity necessary to cause the sliding of the magnet down on a upright metal surface (considering typical friction coefficient). This value varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (shearing) - 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 vertical wall (e.g., a fridge), it will maintain just about 1/5 of its nominal power. Gravity and a low friction coefficient mean that products slide down faster than they pop off the substrate. Planning a wall mount? Remember that the sliding force is significantly lower than the perpendicular breakaway force. On a painted metal, the element will slip down under a significantly smaller weight. Application of an anti-slip pad can effectively improve the result.

Table 4: Material efficiency (substrate influence) - 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 metal plate cannot focus the full magnetic flux, which wastes potential of the holder. Should you attach a powerful product to a weak sheet, the magnetism will penetrate right through and the holding will be smaller. To utilize 100% of this magnet's power, you require a sufficiently solid piece of metal. The saturation phenomenon causes that on sheet metal structures (e.g., appliance housings), the product holds weaker. We advise picking the steel dimension from these parameters.

Table 5: Thermal resistance (stability) - 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 power above the temperature limit. Watch out for overheating – excessive heat can permanently destroy this magnet. With increasing heat, the magnet's capacity briefly lowers. Do not use this magnet near heat sources higher than its operating temperature limit. Too high temperature will result in irreversible degradation of magnetic properties.

*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (pancake types) risk losing magnetic properties sooner compared to rod magnets. Warning indicator in the table indicates permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - 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 strong neodymiums interact from a wider radius than a neodymium and metal setup. Such a system of two magnets produces a massive flux and a larger range of action. Planning to create a strong closure? Use a pair of magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the pinch force is extreme. The levitation is a bit weaker than the connection force, but still impressive.
*Field value in repulsion mode reaches ~0 Gs at the geometric center of the gap (due to field cancellation).

Table 7: Hazards (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
Mechanical watch	20 Gs (2.0 mT)	8.5 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

Extremely neodym field is a large risk to IT equipment and medical implants. These neodymiums generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation acts through matter and plastic. Special caution must be taken by people with hearing aids and drug dispensers. The risk also applies to: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (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 prone to chipping – a violent impact against metal risks their cracking. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can cause material chips or injury to fingers. Hold the magnet firmly during installation so it doesn't slam with momentum against the metal. A contact at a velocity of dozens of km/h almost guarantees destruction of the neodymium. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating 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)

Neodymium magnets are highly susceptible to corrosion without proper protection. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction data (Flux)
MPL 20x20x20 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	22 017 Mx	220.2 µWb
P_c Coefficient	0.84	High (Stable)

Flux value passing through the pole surface. Key data in coil applications as well as sensors. P_c value defines the magnet's 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%

Corrosion 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. However, remember the water resistance when pulling the rope quickly.

1. Shear force

*Warning: On a vertical wall, the magnet retains just a fraction of its nominal pull.

2. Steel saturation

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

3. Temperature resistance

*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) = 0.84

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.

Technical specification and ecology

Elemental analysis

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: 020129-2025

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Model MPL 20x20x20 / N38 features a flat shape and industrial pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 151.12 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.

Separating strong flat 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 20x20x20 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 15.40 kg), they are ideal as closers in furniture making and mounting elements in automation. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

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. Thanks to this, it works best when "sticking" to sheet metal or another magnet with a large surface area. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

This model is characterized by dimensions 20x20x20 mm, which, at a weight of 60 g, makes it an element with impressive 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 product meets the standards for N38 grade magnets.

Pros and cons of rare earth magnets.

Benefits

Besides their remarkable magnetic power, neodymium magnets offer the following advantages:

Their strength remains stable, and after around ten years it drops only by ~1% (theoretically),
They have excellent resistance to magnetic field loss as a result of opposing magnetic fields,
A magnet with a metallic nickel surface looks better,
The surface of neodymium magnets generates a concentrated magnetic field – this is a distinguishing feature,
Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
Thanks to versatility in constructing and the capacity to modify to complex applications,
Key role in modern industrial fields – they find application in computer drives, drive modules, advanced medical instruments, as well as multitasking production systems.
Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures 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 prevent oxidation as well as corrosion.
We suggest a housing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated forms.
Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products can disrupt the diagnostic process medical in case of swallowing.
With large orders the cost of neodymium magnets is a challenge,

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

Breakaway force was defined for the most favorable conditions, taking into account:

using a base made of low-carbon steel, functioning as a circuit closing element
whose thickness is min. 10 mm
with an ideally smooth touching surface
with zero gap (no coatings)
for force acting at a right angle (pull-off, not shear)
at room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by working environment parameters, such as (from priority):

Distance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the flux to be lost into the air.
Material type – ideal substrate is pure iron steel. Cast iron may attract less.
Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
Thermal environment – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets

GPS Danger

GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Handling rules

Before use, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.

Danger to pacemakers

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.

Swallowing risk

Strictly store magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are fatal.

Magnetic media

Avoid bringing magnets close to a wallet, computer, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Fire warning

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Metal Allergy

Studies show that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, avoid direct skin contact or opt for encased magnets.

Hand protection

Mind your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!

Heat warning

Monitor thermal conditions. Heating the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Beware of splinters

Watch out for shards. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.

Caution! Want to know more? Check our post: Why are neodymium magnets dangerous?

MPL 20x20x20 / N38 - lamellar magnet

Product card - 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 - technical parameters

Table 1: Static force (pull vs distance) - power drop MPL 20x20x20 / N38

Table 2: Sliding force (vertical surface) MPL 20x20x20 / N38

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

Table 4: Material efficiency (substrate influence) - power losses MPL 20x20x20 / N38

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

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

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

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

Table 9: Anti-corrosion coating durability MPL 20x20x20 / N38

Table 10: Construction data (Flux) MPL 20x20x20 / N38

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

1. Shear force

2. Steel saturation

3. Temperature resistance

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

Elemental analysis

Ecology and recycling (GPSR)

Magnet pull force

Field Strength

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Pros and cons of rare earth magnets.

Benefits

Weaknesses

Holding force characteristics

Best holding force of the magnet in ideal parameters – what contributes to it?

Determinants of lifting force in real conditions

Safety rules for work with NdFeB magnets

GPS Danger

Handling rules

Danger to pacemakers

Swallowing risk

Magnetic media

Fire warning

Metal Allergy

Hand protection

Heat warning

Beware of splinters

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static force (pull vs distance) - power drop
MPL 20x20x20 / N38

Table 2: Sliding force (vertical surface)
MPL 20x20x20 / N38

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

Table 4: Material efficiency (substrate influence) - power losses
MPL 20x20x20 / N38

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

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

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

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

Table 9: Anti-corrosion coating durability
MPL 20x20x20 / N38

Table 10: Construction data (Flux)
MPL 20x20x20 / N38

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