Product available Ships tomorrow

MPL 30x20x10 / 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 020141

GTIN/EAN: 5906301811473

5.00

length

30 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

19.53 kg / 191.55 N

Magnetic Induction

371.57 mT / 3716 Gs

Coating

[NiCuNi] Nickel

16.11 ZŁ with VAT / pcs + price for transport

13.10 ZŁ net + 23% VAT / pcs

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MPL 30x20x10 / N38 - lamellar magnet

Specification / characteristics MPL 30x20x10 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020141
GTIN/EAN	5906301811473
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	30 mm [±0,1 mm]
Width	20 mm [±0,1 mm]
Height	10 mm [±0,1 mm]
Weight	45 g
Magnetization Direction	↑ axial
Load capacity ~ ?	19.53 kg / 191.55 N
Magnetic Induction ~ ?	371.57 mT / 3716 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 30x20x10 / 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 analysis of the magnet - data

The following data represent the outcome of a physical calculation. Values were calculated on algorithms for the material Nd₂Fe₁₄B. Real-world parameters may deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.

Table 1: Static force (pull vs gap) - power drop
MPL 30x20x10 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	3715 Gs 371.5 mT	19.53 kg / 19530.0 g 191.6 N	critical level
1 mm	3464 Gs 346.4 mT	16.98 kg / 16983.1 g 166.6 N	critical level
2 mm	3197 Gs 319.7 mT	14.47 kg / 14466.6 g 141.9 N	critical level
3 mm	2927 Gs 292.7 mT	12.12 kg / 12123.3 g 118.9 N	critical level
5 mm	2408 Gs 240.8 mT	8.21 kg / 8207.8 g 80.5 N	warning
10 mm	1411 Gs 141.1 mT	2.82 kg / 2815.6 g 27.6 N	warning
15 mm	832 Gs 83.2 mT	0.98 kg / 979.7 g 9.6 N	safe
20 mm	512 Gs 51.2 mT	0.37 kg / 371.2 g 3.6 N	safe
30 mm	224 Gs 22.4 mT	0.07 kg / 70.7 g 0.7 N	safe
50 mm	65 Gs 6.5 mT	0.01 kg / 6.0 g 0.1 N	safe

Pulling power decreases significantly per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, varnish, dust) noticeably diminishes the holding power. Magnets hold optimally in perfect adhesion; gap weakens the force. Notice how quickly the pull force drop, when the magnet does not touch directly to the metal substrate. When planning the assembly, eliminate unnecessary gaps.

Table 2: Vertical Hold (Vertical Surface)
MPL 30x20x10 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	3.91 kg / 3906.0 g 38.3 N
1 mm	Stal (~0.2)	3.40 kg / 3396.0 g 33.3 N
2 mm	Stal (~0.2)	2.89 kg / 2894.0 g 28.4 N
3 mm	Stal (~0.2)	2.42 kg / 2424.0 g 23.8 N
5 mm	Stal (~0.2)	1.64 kg / 1642.0 g 16.1 N
10 mm	Stal (~0.2)	0.56 kg / 564.0 g 5.5 N
15 mm	Stal (~0.2)	0.20 kg / 196.0 g 1.9 N
20 mm	Stal (~0.2)	0.07 kg / 74.0 g 0.7 N
30 mm	Stal (~0.2)	0.01 kg / 14.0 g 0.1 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

The table below defines the theoretical force needed to start the downward movement of the magnet vertically on a vertical steel plate (assuming standard friction). This value is a function of the gap size between the magnet and the surface.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 30x20x10 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	5.86 kg / 5859.0 g 57.5 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	3.91 kg / 3906.0 g 38.3 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.95 kg / 1953.0 g 19.2 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	9.77 kg / 9765.0 g 95.8 N

When mounting a element on a upright plane (e.g., a car body), it will maintain only approx. 1/5 of its nominal power. Gravitational force and a low friction coefficient influence the fact that products slide down easier than they pop off the substrate. Planning a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will slip down under a much lighter load. Using a rubber coating can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 30x20x10 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.98 kg / 976.5 g 9.6 N
1 mm	13%	2.44 kg / 2441.3 g 23.9 N
2 mm	25%	4.88 kg / 4882.5 g 47.9 N
5 mm	63%	12.21 kg / 12206.3 g 119.7 N
10 mm	100%	19.53 kg / 19530.0 g 191.6 N

A too thin steel is not enough to take in the full magnetic flux, which wastes potential of the holder. If you install a neodymium to a weak sheet, the field will pass right through and the pull force will drop sharply. To achieve 100% of this neodymium's potential, you need a suitably thick element of metal. The saturation effect causes that on thin elements (e.g., car bodies), the product shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (material behavior) - power drop
MPL 30x20x10 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	19.53 kg / 19530.0 g 191.6 N	OK
40 °C	-2.2%	19.10 kg / 19100.3 g 187.4 N	OK
60 °C	-4.4%	18.67 kg / 18670.7 g 183.2 N
80 °C	-6.6%	18.24 kg / 18241.0 g 178.9 N
100 °C	-28.8%	13.91 kg / 13905.4 g 136.4 N

Standard neodymium magnets lose parameters after exceeding the maximum temperature. Avoid high temperatures – heat can irreversibly damage this product. With every degree above norm, the neodymium's force temporarily drops. Refrain from using this product close to ovens higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.

*Important note: Thermal stability is determined by both grade, and the Permeance Coefficient Pc. Low-profile magnets (low Pc) may lose charge permanently sooner than long magnets. Red status in the table indicates a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 30x20x10 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	51.05 kg / 51046 g 500.8 N 5 124 Gs	N/A
1 mm	47.76 kg / 47756 g 468.5 N 7 186 Gs	42.98 kg / 42981 g 421.6 N ~0 Gs
2 mm	44.39 kg / 44389 g 435.5 N 6 928 Gs	39.95 kg / 39950 g 391.9 N ~0 Gs
3 mm	41.06 kg / 41060 g 402.8 N 6 663 Gs	36.95 kg / 36954 g 362.5 N ~0 Gs
5 mm	34.68 kg / 34678 g 340.2 N 6 124 Gs	31.21 kg / 31210 g 306.2 N ~0 Gs
10 mm	21.45 kg / 21453 g 210.5 N 4 817 Gs	19.31 kg / 19308 g 189.4 N ~0 Gs
20 mm	7.36 kg / 7359 g 72.2 N 2 821 Gs	6.62 kg / 6623 g 65.0 N ~0 Gs
50 mm	0.40 kg / 405 g 4.0 N 662 Gs	0.36 kg / 364 g 3.6 N ~0 Gs

Two strong neodymiums interact from a significantly greater distance than a neodymium and metal combination. Such a system of two magnets generates a stronger field and a wider radius of performance. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when connecting a pair of magnets, the collision energy is massive. The levitation is slightly lower than the attraction, but still large.
*Flux density for N-N configuration reaches ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 30x20x10 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	13.0 cm
Hearing aid	10 Gs (1.0 mT)	10.0 cm
Mechanical watch	20 Gs (2.0 mT)	8.0 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 is a real danger to electronic devices and pacemakers. These neodymiums produce a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation passes through tissues and glass. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, speakers, and displays. Do not bring the product near payment cards, hard drives, or sensitive navigation tools.

Table 8: Dynamics (cracking risk) - collision effects
MPL 30x20x10 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	22.82 km/h (6.34 m/s)	0.90 J
30 mm	36.47 km/h (10.13 m/s)	2.31 J
50 mm	46.99 km/h (13.05 m/s)	3.83 J
100 mm	66.44 km/h (18.46 m/s)	7.66 J

NdFeB products are prone to chipping – a violent impact against metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Striking energy can destroy the magnet or painful pinches to skin. Always hold the magnet during installation so it doesn't hit with great force against the metal. A collision at high speed almost guarantees destruction of the magnet. Wear eye protection when working with large magnets.

Table 9: Anti-corrosion coating durability
MPL 30x20x10 / 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 30x20x10 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	22 801 Mx	228.0 µWb
P_c Coefficient	0.46	Low (Flat)

Total magnetic flux emitted by the magnet pole. Key data in coil applications and motors. P_c value determines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 30x20x10 / N38

Environment	Effective steel pull	Effect
Air (land)	19.53 kg	Standard
Water (riverbed)	22.36 kg (+2.83 kg Buoyancy gain)	+14.5%

Corrosion warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!

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

1. Sliding resistance

*Caution: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Temperature resistance

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.46

This simulation demonstrates the magnetic stability of the selected magnet under specific geometric conditions. 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 and environmental data

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%

Sustainability

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: 020141-2025

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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 30x20x10 mm and a weight of 45 g, guarantees premium class connection. As a block magnet with high power (approx. 19.53 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.

Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 30x20x10 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, because after separation, the magnets may want to violently snap back together, which threatens pinching the skin. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.

They constitute a key element in the production of wind generators and material handling systems. 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 30x20x10 / N38, it is best to use strong epoxy glues (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. 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. In practice, this means that this magnet has the greatest attraction force on its main planes (30x20 mm), which is ideal for flat mounting. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.

This model is characterized by dimensions 30x20x10 mm, which, at a weight of 45 g, makes it an element with high energy density. It is a magnetic block with dimensions 30x20x10 mm and a self-weight of 45 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of neodymium magnets.

Pros

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

They have unchanged lifting capacity, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
Magnets effectively defend themselves against loss of magnetization caused by foreign field sources,
A magnet with a metallic nickel surface is more attractive,
Magnetic induction on the surface of the magnet is exceptional,
Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
Thanks to versatility in forming and the capacity to adapt to client solutions,
Key role in innovative solutions – they are used in HDD drives, drive modules, medical devices, also industrial machines.
Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Disadvantages of NdFeB magnets:

Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also increases their durability
Neodymium magnets decrease their strength 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 stability even at temperatures up to 230°C
Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
Limited possibility of producing threads in the magnet and complicated forms - preferred is cover - magnet mounting.
Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the context of child health protection. Additionally, small elements of these products are able to complicate diagnosis medical when they are in the body.
Due to complex production process, their price exceeds standard values,

Lifting parameters

Maximum magnetic pulling force – what it depends on?

The declared magnet strength represents the maximum value, measured under laboratory conditions, specifically:

with the use of a yoke made of low-carbon steel, ensuring maximum field concentration
whose thickness reaches at least 10 mm
characterized by smoothness
under conditions of gap-free contact (metal-to-metal)
for force acting at a right angle (in the magnet axis)
at ambient temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity results from a number of factors, listed from crucial:

Distance (between the magnet and the plate), because even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
Steel type – low-carbon steel gives the best results. Alloy admixtures lower magnetic permeability and holding force.
Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap between the magnet’s surface and the plate decreases the load capacity.

H&S for magnets

Powerful field

Handle with care. Rare earth magnets attract from a long distance and snap with massive power, often quicker than you can move away.

Adults only

NdFeB magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which constitutes a critical condition and requires immediate surgery.

Medical interference

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have medical devices.

Cards and drives

Avoid bringing magnets near a wallet, laptop, or TV. The magnetism can irreversibly ruin these devices and wipe information from cards.

Operating temperature

Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.

Skin irritation risks

Certain individuals suffer from a contact allergy to nickel, which is the standard coating for NdFeB magnets. Frequent touching may cause dermatitis. We strongly advise wear safety gloves.

Machining danger

Dust generated during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Fragile material

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into hazardous fragments.

Keep away from electronics

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and GPS navigation. Do not bring magnets near a smartphone to prevent breaking the sensors.

Finger safety

Danger of trauma: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Important! Need more info? Read our article: Why are neodymium magnets dangerous?

MPL 30x20x10 / N38 - lamellar magnet

Need help making a decision?

MPL 30x20x10 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the magnet - data

1. Sliding resistance

2. Efficiency vs thickness

3. Temperature resistance

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

Chemical composition

Sustainability

Magnet Pull Force

Field Strength

Other proposals

SM 18x125 [2xM5] / N42 - magnetic separator

SM 25x275 [2xM8] / N42 - magnetic separator

MW 40x10 / N38 - cylindrical magnet

UMT 12x20 black set / N38 - board holder

Strengths as well as weaknesses of neodymium magnets.

Pros

Weaknesses

Lifting parameters

Maximum magnetic pulling force – what it depends on?

Practical aspects of lifting capacity – factors

Powerful field

Adults only

Medical interference

Cards and drives

Operating temperature

Skin irritation risks

Machining danger

Fragile material

Keep away from electronics

Finger safety

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C