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MPL 50x20x5 / N38 - lamellar magnet

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

technical specifications »

14.56 ZŁ with VAT / pcs + price for transport

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Detailed specification - 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

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 modeling of the assembly - report

These information represent the direct effect of a physical simulation. Results rely on algorithms for the class Nd2Fe14B. Actual parameters might slightly differ. Use these data as a preliminary roadmap for designers.

Table 1: Static force (force vs gap) - interaction chart
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
 12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
 critical level
1 mm 1885 Gs
188.5 mT
 11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
 critical level
2 mm 1772 Gs
177.2 mT
 10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
 critical level
3 mm 1649 Gs
164.9 mT
 8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
 medium risk
5 mm 1395 Gs
139.5 mT
 6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
 medium risk
10 mm 870 Gs
87.0 mT
 2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
 medium risk
15 mm 549 Gs
54.9 mT
 0.98 kg / 2.15 LBS
976.9 g / 9.6 N
 safe
20 mm 359 Gs
35.9 mT
 0.42 kg / 0.92 LBS
418.9 g / 4.1 N
 safe
30 mm 172 Gs
17.2 mT
 0.10 kg / 0.21 LBS
95.7 g / 0.9 N
 safe
50 mm 54 Gs
5.4 mT
 0.01 kg / 0.02 LBS
9.5 g / 0.1 N
 safe
Grip strength drops drastically with every subsequent millimeter of gap. Keep in mind that even a microscopic distance (e.g., dirt, paint, rust) strongly diminishes the holding power. Magnetic products work most effectively at the point of direct contact; air break drastically cuts the force. See how flashily the pull force drop, when the magnet does not touch directly to the steel surface. When calculating the assembly, eliminate additional spacers.

Table 2: Vertical hold (vertical surface)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 LBS
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 LBS
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 LBS
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 LBS
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 LBS
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 LBS
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 LBS
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 LBS
2.0 g / 0.0 N
The table below shows the theoretical holding capacity necessary to start the slippage of the magnet downwards on a upright metal surface (assuming typical friction coefficient). This value depends on the separation distance between the magnet and the metal.

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

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 LBS
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 LBS
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 LBS
6345.0 g / 62.2 N
When placing a magnet on a upright wall (e.g., a fridge), it will maintain barely approx. 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient cause that products slip easier than they pop off the substrate. Planning a wall mount? Remember that the shear force is much weaker than the maximum static pull force. On a painted metal, the element will give way down under a significantly smaller weight. Application of an anti-slip layer can significantly raise the stability.

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

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 0.63 kg / 1.40 LBS
634.5 g / 6.2 N
1 mm
13%
 1.59 kg / 3.50 LBS
1586.3 g / 15.6 N
2 mm
25%
 3.17 kg / 6.99 LBS
3172.5 g / 31.1 N
3 mm
38%
 4.76 kg / 10.49 LBS
4758.8 g / 46.7 N
5 mm
63%
 7.93 kg / 17.49 LBS
7931.2 g / 77.8 N
10 mm
100%
 12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
11 mm
100%
 12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
12 mm
100%
 12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
A thin sheet cannot focus the full magnetic flux, which wastes potential of the holder. Should you install a neodymium to a weak sheet, the field will pass right through and the holding will be smaller. To achieve full efficiency of this magnet's power, you require a sufficiently solid element of metal. The saturation effect causes that on thin elements (e.g., appliance housings), the holder holds weaker. We advise picking the steel thickness according to the table below.

Table 5: Thermal resistance (stability) - power drop
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
 OK
40 °C -2.2% 12.41 kg / 27.36 LBS
12410.8 g / 121.8 N
 OK
60 °C -4.4% 12.13 kg / 26.75 LBS
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 LBS
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 LBS
9035.3 g / 88.6 N
Ordinary NdFeB products irreversibly lose strength after exceeding the maximum temperature. Watch out for overheating – heat can irreversibly destroy this product. As the temperature rises, the neodymium's force briefly decreases. Refrain from using this magnet close to heaters higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetic properties.
*Technical advisory: Temperature resistance is determined by both grade, as well as the dimension ratios. Low-profile magnets (low Pc) are more susceptible to demagnetization sooner compared to rod magnets. Warning indicator in the table signals a risk of irreversible loss for this particular item.

Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 LBS
3 371 Gs
3.61 kg / 7.97 LBS
3614 g / 35.5 N
 N/A
1 mm 23.06 kg / 50.84 LBS
3 868 Gs
3.46 kg / 7.63 LBS
3459 g / 33.9 N
 20.75 kg / 45.75 LBS
~0 Gs
2 mm 21.89 kg / 48.27 LBS
3 769 Gs
3.28 kg / 7.24 LBS
3284 g / 32.2 N
 19.71 kg / 43.44 LBS
~0 Gs
3 mm 20.65 kg / 45.53 LBS
3 661 Gs
3.10 kg / 6.83 LBS
3098 g / 30.4 N
 18.59 kg / 40.98 LBS
~0 Gs
5 mm 18.07 kg / 39.83 LBS
3 424 Gs
2.71 kg / 5.97 LBS
2710 g / 26.6 N
 16.26 kg / 35.84 LBS
~0 Gs
10 mm 12.00 kg / 26.46 LBS
2 790 Gs
1.80 kg / 3.97 LBS
1800 g / 17.7 N
 10.80 kg / 23.81 LBS
~0 Gs
20 mm 4.67 kg / 10.30 LBS
1 741 Gs
0.70 kg / 1.54 LBS
701 g / 6.9 N
 4.20 kg / 9.27 LBS
~0 Gs
50 mm 0.37 kg / 0.81 LBS
488 Gs
0.06 kg / 0.12 LBS
55 g / 0.5 N
 0.33 kg / 0.73 LBS
~0 Gs
60 mm 0.18 kg / 0.40 LBS
343 Gs
0.03 kg / 0.06 LBS
27 g / 0.3 N
 0.16 kg / 0.36 LBS
~0 Gs
70 mm 0.10 kg / 0.21 LBS
248 Gs
0.01 kg / 0.03 LBS
14 g / 0.1 N
 0.09 kg / 0.19 LBS
~0 Gs
80 mm 0.05 kg / 0.12 LBS
184 Gs
0.01 kg / 0.02 LBS
8 g / 0.1 N
 0.05 kg / 0.10 LBS
~0 Gs
90 mm 0.03 kg / 0.07 LBS
140 Gs
0.00 kg / 0.01 LBS
5 g / 0.0 N
 0.03 kg / 0.06 LBS
~0 Gs
100 mm 0.02 kg / 0.04 LBS
108 Gs
0.00 kg / 0.01 LBS
3 g / 0.0 N
 0.02 kg / 0.04 LBS
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal combination. Such a system of two magnets produces a massive flux and a wider radius of performance. Want to build a solid fastener? Use a pair of magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is extreme. The repulsion force is a bit weaker than the attraction, but still large.
*The magnetic induction between like poles drops to ~0 Gs at the geometric center between the magnets (due to field cancellation).
Attention: Estimates demonstrate shear force of two matching magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Protective zones (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
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 real danger to IT equipment as well as medical implants. These NdFeB products generate a flux that disrupts operation of digital equipment. Remember: the unseen radiation passes through tissues and housings. Increased vigilance must be taken by people with cochlear implants and drug dispensers. Influence will be felt by: automatic timepieces, remotes, speakers, and screens. Do not place the magnet near cards, HDD media, or sensitive navigation tools.

Table 8: Impact energy (cracking risk) - collision effects
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
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 magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to fingers. Hold the magnet firmly during bringing near metal so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear safety glasses when working with powerful specimens.

Table 9: Anti-corrosion coating 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 SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

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

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter for generator designers and motors. The Pc coefficient determines the working geometry.

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%
Rust risk: 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical wall, the magnet holds merely a fraction of its max power.

2. Plate thickness effect

*Thin metal sheet (e.g. computer case) severely reduces the holding force.

3. Temperature resistance

*For N38 grade, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (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 Pc (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 Pc 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
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%
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: 020473-2026
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Component MPL 50x20x5 / N38 features a flat shape and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 12.69 kg), this product is available off-the-shelf 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. 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 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 50x20x5 / N38, it is best to use two-component adhesives (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. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x20x5 / N38 model is magnetized through the thickness (dimension 5 mm), which means that the N and S poles are located on its largest, flat surfaces. 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.
This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with impressive energy density. 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 product meets the standards for N38 grade magnets.

Strengths and weaknesses of rare earth magnets.

Pros

Apart from their consistent power, neodymium magnets have these key benefits:
  • They do not lose power, even during approximately ten years – the reduction in lifting capacity is only ~1% (based on measurements),
  • Neodymium magnets are characterized by remarkably resistant to loss of magnetic properties caused by external magnetic fields,
  • Thanks to the shiny finish, the coating of nickel, gold-plated, or silver-plated gives an aesthetic appearance,
  • Magnets possess maximum magnetic induction on the working surface,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Thanks to flexibility in constructing and the ability to modify to specific needs,
  • Key role in advanced technology sectors – they are used in mass storage devices, electric drive systems, precision medical tools, also complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages

Disadvantages of neodymium magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these devices can be problematic in diagnostics medical when they are in the body.
  • Due to expensive raw materials, their price is relatively high,

Holding force characteristics

Maximum lifting force for a neodymium magnet – what contributes to it?

Holding force of 12.69 kg is a measurement result performed under specific, ideal conditions:
  • with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
  • possessing a thickness of min. 10 mm to avoid saturation
  • with an ideally smooth touching surface
  • without any insulating layer between the magnet and steel
  • under vertical force vector (90-degree angle)
  • in stable room temperature

Lifting capacity in practice – influencing factors

During everyday use, the actual lifting capacity results from many variables, presented from crucial:
  • Distance (betwixt the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
  • Direction of force – maximum parameter is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. Alloy additives weaken the interaction with the magnet.
  • Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
  • Temperature – temperature increase results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Precautions when working with NdFeB magnets
Metal Allergy

A percentage of the population have a contact allergy to Ni, which is the standard coating for neodymium magnets. Extended handling might lead to dermatitis. We recommend use safety gloves.

Warning for heart patients

Life threat: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

No play value

Product intended for adults. Tiny parts pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.

Data carriers

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

Fragile material

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Pinching danger

Watch your fingers. Two large magnets will snap together immediately with a force of massive weight, crushing everything in their path. Exercise extreme caution!

Combustion hazard

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

Maximum temperature

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and strength.

Conscious usage

Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.

Phone sensors

A powerful magnetic field interferes with the functioning of compasses in phones and navigation systems. Do not bring magnets close to a device to avoid damaging the sensors.

Security! Need more info? Check our post: Why are neodymium magnets dangerous?