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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

see parameters »

14.56 ZŁ with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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Technical - 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

Physical simulation of the assembly - technical parameters

The following values are the direct effect of a physical calculation. Results were calculated on models for the material Nd₂Fe₁₄B. Operational conditions might slightly differ. Use these data as a supplementary guide when designing systems.

Table 1: Static pull force (force vs distance) - power drop
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	warning
5 mm	1395 Gs 139.5 mT	6.32 kg / 6320.3 g 62.0 N	warning
10 mm	870 Gs 87.0 mT	2.46 kg / 2459.4 g 24.1 N	warning
15 mm	549 Gs 54.9 mT	0.98 kg / 976.9 g 9.6 N	low risk
20 mm	359 Gs 35.9 mT	0.42 kg / 418.9 g 4.1 N	low risk
30 mm	172 Gs 17.2 mT	0.10 kg / 95.7 g 0.9 N	low risk
50 mm	54 Gs 5.4 mT	0.01 kg / 9.5 g 0.1 N	low risk

Magnetic force decreases significantly with every mm of gap. Keep in mind that every additional insulation layer (e.g., dirt, varnish, veneer) noticeably reduces the pull force. Magnetic products operate optimally in perfect adhesion; gap nullifies the power. Observe how rapidly the pull force fall, when the product does not adhere tightly to the steel surface. When calculating the assembly, discard unnecessary gaps.

Table 2: Vertical 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

The table below indicates the theoretical holding capacity needed to start the shifting of the magnet down along a upright metal surface (considering standard friction). This value varies with the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 placing a magnet on a upright plane (e.g., a board), it will maintain just approx. 1/5 of its maximum pull force. Gravity and a low friction coefficient influence the fact that products move down easier than they detach. Planning a hanger? Note that the sliding force is significantly lower than the maximum static pull force. On a painted metal, the element will give way down under a much lighter load. Utilizing a rubberized layer can drastically increase the grip.

Table 4: Steel thickness (saturation) - sheet metal selection
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 metal plate cannot absorb the entire magnetic field, which squanders power of the holder. Should you mount a strong magnet to a too thin substrate, the flux will penetrate right through and the holding will be smaller. To utilize full efficiency of this neodymium's power, you require a sufficiently solid backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., thin profiles), the magnet holds weaker. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal resistance (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 irreversibly lose parameters above the temperature limit. Avoid high temperatures – excessive heat can permanently destroy this product. With every degree above norm, the magnet's power temporarily lowers. Do not use this product close to ovens higher than its working range. Exceeding the critical threshold will result in irreversible degradation of magnetic properties.

*Important note: Temperature resistance depends not only on the material grade, as well as the dimension ratios. Flat magnets (low permeance coefficient) risk losing magnetic properties at lower temperatures than taller cylinders. Warning indicator in the table signals permanent field degradation for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 magnetic products attract each other from a wider radius than a magnet and steel combination. The setup of magnet-to-magnet generates a stronger field and a further horizon of action. Planning to create a solid fastener? Use a pair of magnets instead of one magnet and a steel. Remember that when bringing together two magnets, the impact force is extreme. The levitation is slightly lower than the attraction, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs in the exact middle of the gap (resulting from vector opposition).

Table 7: Hazards (electronics) - warnings
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
Mechanical watch	20 Gs (2.0 mT)	7.5 cm
Mobile device	40 Gs (4.0 mT)	6.0 cm
Car key	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

A strong magnetic field is a large risk to electronic devices and medical implants. These magnets generate a field that prevents correct functioning of sensitive medical devices. Be aware: the unseen radiation passes through tissues and plastic. Increased vigilance must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, remotes, speakers, and screens. Avoid contact with magnetic cards, hard drives, or precise measuring instruments.

Table 8: Collisions (cracking risk) - 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

Neodymium magnets are very brittle – a violent impact against metal causes immediate chipping. Watch the impact speed – a neodymium left loose speeds with massive force. Kinetic force can trigger coating fragments or dangerous crushing to skin. Always hold the magnet during installation so it doesn't hit violently against the metal. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Coating parameters (durability)
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)

The following table defines the conditions under which this product can be safely used. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction 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 passing through the pole surface. Key data in coil applications and motors. P_c value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
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: 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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.

1. Wall mount (shear)

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

2. Plate thickness effect

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

3. Thermal stability

*For N38 material, the safety limit is 80°C.

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

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

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

Material specification

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

Magnet Unit Converter

Force (pull)

Force in kg

Newtons (N)

Force in lbs

Field Strength

Induction (T)

Input a figure in just one slot to see the conversion in all other units at once.

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Model MPL 50x20x5 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. This magnetic block with a force of 124.48 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. To separate the MPL 50x20x5 / 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. 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 generators and material handling systems. They work great as invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.

For mounting flat magnets MPL 50x20x5 / N38, it is best to use strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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. 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). It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths as well as weaknesses of neodymium magnets.

Benefits

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

They have stable power, and over more than ten years their attraction force decreases symbolically – ~1% (in testing),
Magnets perfectly protect themselves against demagnetization caused by external fields,
Thanks to the shimmering finish, the coating of nickel, gold-plated, or silver-plated gives an professional appearance,
They show high magnetic induction at the operating surface, which increases their power,
Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
Thanks to modularity in constructing and the ability to adapt to complex applications,
Universal use in high-tech industry – they are used in computer drives, brushless drives, diagnostic systems, as well as modern systems.
Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which enables their usage in compact constructions

Weaknesses

Disadvantages of NdFeB magnets:

To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their strength 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
Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
Due to limitations in creating nuts and complex forms in magnets, we recommend using cover - magnetic holder.
Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these devices are able to disrupt the diagnostic process medical after entering the body.
Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

The load parameter shown represents the peak performance, measured under ideal test conditions, namely:

with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
whose transverse dimension reaches at least 10 mm
with an ideally smooth contact surface
without the slightest air gap between the magnet and steel
under axial force direction (90-degree angle)
at standard ambient temperature

Practical aspects of lifting capacity – factors

During everyday use, the real power depends on a number of factors, ranked from the most important:

Space between surfaces – every millimeter of distance (caused e.g. by veneer or dirt) diminishes the magnet efficiency, often by half at just 0.5 mm.
Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
Plate thickness – too thin steel does not accept the full field, causing part of the flux to be lost into the air.
Chemical composition of the base – low-carbon steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
Base smoothness – the more even the surface, the better the adhesion and stronger the hold. Unevenness creates an air distance.
Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.

Warnings

Avoid contact if allergic

Allergy Notice: The Ni-Cu-Ni coating contains nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.

Material brittleness

Despite the nickel coating, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Keep away from children

Absolutely keep magnets away from children. Choking hazard is high, and the effects of magnets connecting inside the body are life-threatening.

Flammability

Fire warning: Neodymium dust is explosive. Avoid machining magnets without safety gear as this risks ignition.

Powerful field

Be careful. Neodymium magnets attract from a distance and connect with huge force, often faster than you can move away.

Protect data

Do not bring magnets near a wallet, computer, or TV. The magnetic field can destroy these devices and erase data from cards.

Hand protection

Protect your hands. Two powerful magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!

Threat to navigation

A powerful magnetic field disrupts the functioning of magnetometers in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid damaging the sensors.

Maximum temperature

Monitor thermal conditions. Heating the magnet to high heat will destroy its properties and strength.

ICD Warning

For implant holders: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or ask another person to handle the magnets.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?

MPL 50x20x5 / N38 - lamellar magnet

Technical - MPL 50x20x5 / N38 - lamellar magnet

Magnetic properties of material N38

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical simulation of the assembly - technical parameters

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

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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces MPL 50x20x5 / N38

Table 4: Steel thickness (saturation) - sheet metal selection MPL 50x20x5 / N38

Table 5: Thermal resistance (stability) - thermal limit MPL 50x20x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range MPL 50x20x5 / N38

Table 7: Hazards (electronics) - warnings MPL 50x20x5 / N38

Table 8: Collisions (cracking risk) - warning MPL 50x20x5 / N38

Table 9: Coating parameters (durability) MPL 50x20x5 / N38

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

Table 11: Underwater work (magnet fishing) MPL 50x20x5 / N38

1. Wall mount (shear)

2. Plate thickness effect

3. Thermal stability

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

Material specification

Environmental data

Force (pull)

Field Strength

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Strengths as well as weaknesses of neodymium magnets.

Benefits

Weaknesses

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Practical aspects of lifting capacity – factors

Warnings

Avoid contact if allergic

Material brittleness

Keep away from children

Flammability

Powerful field

Protect data

Hand protection

Threat to navigation

Maximum temperature

ICD Warning

Physical properties of sintered neodymium magnets Nd₂Fe₁₄B at 20°C

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

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

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 50x20x5 / N38

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x20x5 / N38

Table 5: Thermal resistance (stability) - thermal limit
MPL 50x20x5 / N38

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 50x20x5 / N38

Table 7: Hazards (electronics) - warnings
MPL 50x20x5 / N38

Table 8: Collisions (cracking risk) - warning
MPL 50x20x5 / N38

Table 9: Coating parameters (durability)
MPL 50x20x5 / N38

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

Table 11: Underwater work (magnet fishing)
MPL 50x20x5 / N38