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MPL 50x20x5 / 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 020473

GTIN/EAN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

Coating

[NiCuNi] Nickel

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Technical of the product - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties

properties	values
Cat. no.	020473
GTIN/EAN	5906301811930
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	50 mm [±0,1 mm]
Width	20 mm [±0,1 mm]
Height	5 mm [±0,1 mm]
Weight	37.5 g
Magnetization Direction	↑ axial
Load capacity ~ ?	12.69 kg / 124.48 N
Magnetic Induction ~ ?	197.73 mT / 1977 Gs
Coating	[NiCuNi] Nickel
Manufacturing Tolerance	±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 - report

The following data are the direct effect of a mathematical simulation. Values are based on algorithms for the material Nd₂Fe₁₄B. Operational conditions may differ. Please consider these data as a preliminary roadmap when designing systems.

Table 1: Static pull force (pull vs distance) - characteristics
MPL 50x20x5 / N38

Distance (mm)	Induction (Gauss) / mT	Pull Force (kg)	Risk Status
0 mm	1977 Gs 197.7 mT	12.69 kg / 12690.0 g 124.5 N	critical level
1 mm	1885 Gs 188.5 mT	11.53 kg / 11530.3 g 113.1 N	critical level
2 mm	1772 Gs 177.2 mT	10.20 kg / 10199.9 g 100.1 N	critical level
3 mm	1649 Gs 164.9 mT	8.83 kg / 8831.3 g 86.6 N	strong
5 mm	1395 Gs 139.5 mT	6.32 kg / 6320.3 g 62.0 N	strong
10 mm	870 Gs 87.0 mT	2.46 kg / 2459.4 g 24.1 N	strong
15 mm	549 Gs 54.9 mT	0.98 kg / 976.9 g 9.6 N	weak grip
20 mm	359 Gs 35.9 mT	0.42 kg / 418.9 g 4.1 N	weak grip
30 mm	172 Gs 17.2 mT	0.10 kg / 95.7 g 0.9 N	weak grip
50 mm	54 Gs 5.4 mT	0.01 kg / 9.5 g 0.1 N	weak grip

Pulling power drops sharply with every mm of gap. Note that every additional insulation layer (e.g., contamination, varnish, rust) significantly reduces the pull force. Magnets operate strongest in perfect adhesion; air break nullifies the power. See how quickly the load capacity plummet, when the product does not adhere tightly to the metal substrate. When planning the mounting, discard redundant distances.

Table 2: Slippage load (wall)
MPL 50x20x5 / N38

Distance (mm)	Friction coefficient	Pull Force (kg)
0 mm	Stal (~0.2)	2.54 kg / 2538.0 g 24.9 N
1 mm	Stal (~0.2)	2.31 kg / 2306.0 g 22.6 N
2 mm	Stal (~0.2)	2.04 kg / 2040.0 g 20.0 N
3 mm	Stal (~0.2)	1.77 kg / 1766.0 g 17.3 N
5 mm	Stal (~0.2)	1.26 kg / 1264.0 g 12.4 N
10 mm	Stal (~0.2)	0.49 kg / 492.0 g 4.8 N
15 mm	Stal (~0.2)	0.20 kg / 196.0 g 1.9 N
20 mm	Stal (~0.2)	0.08 kg / 84.0 g 0.8 N
30 mm	Stal (~0.2)	0.02 kg / 20.0 g 0.2 N
50 mm	Stal (~0.2)	0.00 kg / 2.0 g 0.0 N

This section shows the approximate weight limit necessary to cause the slippage of the magnet down on a upright steel wall (considering standard friction). This parameter varies with the gap size between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 50x20x5 / N38

Surface type	Friction coefficient / % Mocy	Max load (kg)
Raw steel	µ = 0.3 30% Nominalnej Siły	3.81 kg / 3807.0 g 37.3 N
Painted steel (standard)	µ = 0.2 20% Nominalnej Siły	2.54 kg / 2538.0 g 24.9 N
Oily/slippery steel	µ = 0.1 10% Nominalnej Siły	1.27 kg / 1269.0 g 12.4 N
Magnet with anti-slip rubber	µ = 0.5 50% Nominalnej Siły	6.35 kg / 6345.0 g 62.2 N

When mounting a element on a upright plane (e.g., a board), it will maintain barely approx. 1/5 of nominal attraction strength. Gravity and a low friction coefficient cause that holders slide down faster than they pull off. Designing a wall mount? Remember that the sliding force is much weaker than the maximum static pull force. On a painted metal, the magnet will give way down under a significantly smaller load. Application of an anti-slip pad can drastically increase the grip.

Table 4: Steel thickness (substrate influence) - power losses
MPL 50x20x5 / N38

Steel thickness (mm)	% power	Real pull force (kg)
0.5 mm	5%	0.63 kg / 634.5 g 6.2 N
1 mm	13%	1.59 kg / 1586.3 g 15.6 N
2 mm	25%	3.17 kg / 3172.5 g 31.1 N
5 mm	63%	7.93 kg / 7931.2 g 77.8 N
10 mm	100%	12.69 kg / 12690.0 g 124.5 N

A thin sheet cannot conduct the full magnetic flux, which wastes potential of the holder. Should you attach a powerful product to a weak sheet, the flux will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's power, you need a suitably thick backing of metal. The saturation effect causes that on delicate walls (e.g., appliance housings), the holder shows lower pull force. We advise picking the steel dimension from these parameters.

Table 5: Working in heat (stability) - thermal limit
MPL 50x20x5 / N38

Ambient temp. (°C)	Power loss	Remaining pull	Status
20 °C	0.0%	12.69 kg / 12690.0 g 124.5 N	OK
40 °C	-2.2%	12.41 kg / 12410.8 g 121.8 N	OK
60 °C	-4.4%	12.13 kg / 12131.6 g 119.0 N
80 °C	-6.6%	11.85 kg / 11852.5 g 116.3 N
100 °C	-28.8%	9.04 kg / 9035.3 g 88.6 N

Standard neodymium magnets change their properties power after exceeding the maximum temperature. Watch out for overheating – excessive heat can permanently destroy this magnet. With every degree above norm, the magnet's force briefly drops. Avoid using this magnet close to ovens exceeding its operating temperature limit. Too high temperature will cause irreversible degradation of magnetism.

*Technical advisory: Heat tolerance is determined by both grade, as well as the dimension ratios. Flat magnets (pancake types) are more susceptible to demagnetization under lower heat stress than long magnets. Warning indicator in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm)	Attraction (kg) (N-S)	Repulsion (kg) (N-N)
0 mm	24.10 kg / 24097 g 236.4 N 3 371 Gs	N/A
1 mm	23.06 kg / 23059 g 226.2 N 3 868 Gs	20.75 kg / 20753 g 203.6 N ~0 Gs
2 mm	21.89 kg / 21894 g 214.8 N 3 769 Gs	19.71 kg / 19705 g 193.3 N ~0 Gs
3 mm	20.65 kg / 20654 g 202.6 N 3 661 Gs	18.59 kg / 18589 g 182.4 N ~0 Gs
5 mm	18.07 kg / 18065 g 177.2 N 3 424 Gs	16.26 kg / 16259 g 159.5 N ~0 Gs
10 mm	12.00 kg / 12002 g 117.7 N 2 790 Gs	10.80 kg / 10801 g 106.0 N ~0 Gs
20 mm	4.67 kg / 4670 g 45.8 N 1 741 Gs	4.20 kg / 4203 g 41.2 N ~0 Gs
50 mm	0.37 kg / 368 g 3.6 N 488 Gs	0.33 kg / 331 g 3.2 N ~0 Gs

Two strong neodymiums attract each other from a much further distance than a magnet and sheet setup. The connection of magnet-to-magnet creates a more powerful interaction and a larger range of operation. Designing a solid fastener? Apply two magnets instead of a neodymium and a striker plate. Exercise caution that when connecting a pair of magnets, the collision energy is huge. The repulsion force is slightly lower than the attraction, but still significant.
*The magnetic induction in repulsion mode drops to ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x20x5 / N38

Object / Device	Limit (Gauss) / mT	Safe distance
Pacemaker	5 Gs (0.5 mT)	12.5 cm
Hearing aid	10 Gs (1.0 mT)	9.5 cm
Timepiece	20 Gs (2.0 mT)	7.5 cm
Phone / Smartphone	40 Gs (4.0 mT)	6.0 cm
Remote	50 Gs (5.0 mT)	5.5 cm
Payment card	400 Gs (40.0 mT)	2.0 cm
HDD hard drive	600 Gs (60.0 mT)	1.5 cm

Powerful magnet radiation is a serious hazard to electronic devices as well as pacemakers. These magnets generate a flux that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, car keys, speakers, and displays. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Dynamics (kinetic energy) - warning
MPL 50x20x5 / N38

Start from (mm)	Speed (km/h)	Energy (J)
10 mm	20.68 km/h (5.74 m/s)	0.62 J
30 mm	32.28 km/h (8.97 m/s)	1.51 J
50 mm	41.50 km/h (11.53 m/s)	2.49 J
100 mm	58.67 km/h (16.30 m/s)	4.98 J

Magnetic elements are very brittle – a strong collision with metal risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can cause material chips or painful pinches to skin. Always hold the magnet during bringing near metal so it doesn't hit with great force against the metal. A collision at high speed means shattering of the magnet. Use safety goggles when playing with large magnets.

Table 9: Surface protection spec
MPL 50x20x5 / 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 50x20x5 / N38

Parameter	Value	SI Unit / Description
Magnetic Flux	20 792 Mx	207.9 µWb
P_c Coefficient	0.21	Low (Flat)

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

Table 11: Hydrostatics and buoyancy
MPL 50x20x5 / N38

Environment	Effective steel pull	Effect
Air (land)	12.69 kg	Standard
Water (riverbed)	14.53 kg (+1.84 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!

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

1. Shear force

*Caution: On a vertical surface, the magnet retains only a fraction of its nominal pull.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.

3. Thermal stability

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

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

chart generated for the permeance coefficient P_c (Permeance Coefficient) = 0.21

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%

Environmental data

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: 020473-2025

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Kilograms (kg)

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Component MPL 50x20x5 / 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. 12.69 kg), this product is available immediately from our warehouse in Poland. Furthermore, 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 50x20x5 / 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. Using a screwdriver risks destroying the coating and permanently cracking the magnet.

Plate magnets MPL 50x20x5 / 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. 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. 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 (50x20 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.

The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 20 mm (width), and 5 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 12.69 kg (force ~124.48 N), which, with such a compact shape, proves the high power of the material. The product meets the standards for N38 grade magnets.

Pros and cons of neodymium magnets.

Strengths

Apart from their notable magnetic energy, neodymium magnets have these key benefits:

They virtually do not lose strength, because even after 10 years the performance loss is only ~1% (based on calculations),
They feature excellent resistance to magnetism drop when exposed to external fields,
A magnet with a metallic nickel surface looks better,
Magnetic induction on the working part of the magnet is very high,
Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
In view of the potential of flexible forming and adaptation to custom needs, neodymium magnets can be manufactured in a wide range of geometric configurations, which amplifies use scope,
Huge importance in modern industrial fields – they find application in data components, electromotive mechanisms, medical devices, and complex engineering applications.
Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices

Disadvantages

Drawbacks and weaknesses of neodymium magnets: tips and applications.

Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
Neodymium magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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 very resistant to heat
Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture
Limited ability of creating threads in the magnet and complex shapes - recommended is casing - mounting mechanism.
Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to complicate diagnosis medical after entering the body.
Due to neodymium price, their price is higher than average,

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power is the result of a measurement for ideal contact conditions, assuming:

on a base made of structural steel, optimally conducting the magnetic flux
whose thickness is min. 10 mm
with a plane cleaned and smooth
without any insulating layer between the magnet and steel
under axial force vector (90-degree angle)
at room temperature

Lifting capacity in real conditions – factors

Please note that the working load will differ influenced by the following factors, starting with the most relevant:

Distance – existence of foreign body (paint, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
Direction of force – maximum parameter is reached only during perpendicular pulling. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be wasted to the other side.
Chemical composition of the base – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet and the plate lowers the holding force.

Safety rules for work with neodymium magnets

Powerful field

Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.

Skin irritation risks

Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, prevent direct skin contact and opt for versions in plastic housing.

Hand protection

Risk of injury: The pulling power is so immense that it can result in blood blisters, crushing, and broken bones. Protective gloves are recommended.

Data carriers

Intense magnetic fields can erase data on credit cards, hard drives, and other magnetic media. Keep a distance of min. 10 cm.

Risk of cracking

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Phone sensors

GPS units and mobile phones are extremely susceptible to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.

Machining danger

Powder produced during grinding of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Pacemakers

Individuals with a pacemaker should keep an absolute distance from magnets. The magnetism can disrupt the operation of the life-saving device.

Thermal limits

Regular neodymium magnets (N-type) lose power when the temperature exceeds 80°C. The loss of strength is permanent.

Product not for children

Product intended for adults. Tiny parts can be swallowed, causing serious injuries. Keep out of reach of kids and pets.

Safety First! More info about risks in the article: Magnet Safety Guide.

MPL 50x20x5 / N38 - lamellar magnet

Technical of the product - MPL 50x20x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Technical analysis of the magnet - report

Table 1: Static pull force (pull vs distance) - characteristics MPL 50x20x5 / N38

Table 2: Slippage load (wall) MPL 50x20x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull MPL 50x20x5 / N38

Table 4: Steel thickness (substrate influence) - power losses MPL 50x20x5 / N38

Table 5: Working in heat (stability) - thermal limit MPL 50x20x5 / N38

Table 6: Two magnets (attraction) - field collision MPL 50x20x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures MPL 50x20x5 / N38

Table 8: Dynamics (kinetic energy) - warning MPL 50x20x5 / N38

Table 9: Surface protection spec MPL 50x20x5 / N38

Table 10: Electrical data (Pc) MPL 50x20x5 / N38

Table 11: Hydrostatics and buoyancy MPL 50x20x5 / N38

1. Shear force

2. Steel saturation

3. Thermal stability

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

Chemical composition

Environmental data

Magnet pull force

Field Strength

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Pros and cons of neodymium magnets.

Strengths

Disadvantages

Pull force analysis

Best holding force of the magnet in ideal parameters – what it depends on?

Lifting capacity in real conditions – factors

Safety rules for work with neodymium magnets

Powerful field

Skin irritation risks

Hand protection

Data carriers

Risk of cracking

Phone sensors

Machining danger

Pacemakers

Thermal limits

Product not for children

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

Table 1: Static pull force (pull vs distance) - characteristics
MPL 50x20x5 / N38

Table 2: Slippage load (wall)
MPL 50x20x5 / N38

Table 3: Vertical assembly (sliding) - vertical pull
MPL 50x20x5 / N38

Table 4: Steel thickness (substrate influence) - power losses
MPL 50x20x5 / N38

Table 5: Working in heat (stability) - thermal limit
MPL 50x20x5 / N38

Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x20x5 / N38

Table 8: Dynamics (kinetic energy) - warning
MPL 50x20x5 / N38

Table 9: Surface protection spec
MPL 50x20x5 / N38

Table 10: Electrical data (P_c)
MPL 50x20x5 / N38

Table 11: Hydrostatics and buoyancy
MPL 50x20x5 / N38