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MPL 50x20x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020165

GTIN/EAN: 5906301811718

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

75 g

Magnetization Direction

↑ axial

Load capacity

29.99 kg / 294.15 N

Magnetic Induction

337.18 mT / 3372 Gs

Coating

[NiCuNi] Nickel

technical parameters »

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Technical specification of the product - MPL 50x20x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020165
GTIN/EAN 5906301811718
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 10 mm [±0,1 mm]
Weight 75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 29.99 kg / 294.15 N
Magnetic Induction ~ ? 337.18 mT / 3372 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x10 / 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

Technical analysis of the magnet - data

Presented data are the direct effect of a physical analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world performance might slightly deviate from the simulation results. Please consider these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - characteristics
MPL 50x20x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3371 Gs
337.1 mT
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
 dangerous!
1 mm 3158 Gs
315.8 mT
 26.32 kg / 58.03 LBS
26323.3 g / 258.2 N
 dangerous!
2 mm 2932 Gs
293.2 mT
 22.69 kg / 50.02 LBS
22687.6 g / 222.6 N
 dangerous!
3 mm 2703 Gs
270.3 mT
 19.29 kg / 42.52 LBS
19286.7 g / 189.2 N
 dangerous!
5 mm 2266 Gs
226.6 mT
 13.55 kg / 29.86 LBS
13546.3 g / 132.9 N
 dangerous!
10 mm 1419 Gs
141.9 mT
 5.31 kg / 11.71 LBS
5313.0 g / 52.1 N
 medium risk
15 mm 908 Gs
90.8 mT
 2.17 kg / 4.79 LBS
2174.5 g / 21.3 N
 medium risk
20 mm 603 Gs
60.3 mT
 0.96 kg / 2.12 LBS
961.0 g / 9.4 N
 safe
30 mm 296 Gs
29.6 mT
 0.23 kg / 0.51 LBS
231.0 g / 2.3 N
 safe
50 mm 97 Gs
9.7 mT
 0.02 kg / 0.05 LBS
24.8 g / 0.2 N
 safe
Pulling power drops sharply with every subsequent millimeter of spacing. Remember that even a microscopic distance (e.g., contamination, paint, dust) noticeably weakens the grip. Magnetic products work optimally in perfect adhesion; gap weakens the force. Observe how rapidly the load capacity drop, when the product does not touch directly to the steel surface. When designing the assembly, eliminate redundant distances.

Table 2: Slippage force (vertical surface)
MPL 50x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
1 mm Stal (~0.2) 5.26 kg / 11.61 LBS
5264.0 g / 51.6 N
2 mm Stal (~0.2) 4.54 kg / 10.00 LBS
4538.0 g / 44.5 N
3 mm Stal (~0.2) 3.86 kg / 8.51 LBS
3858.0 g / 37.8 N
5 mm Stal (~0.2) 2.71 kg / 5.97 LBS
2710.0 g / 26.6 N
10 mm Stal (~0.2) 1.06 kg / 2.34 LBS
1062.0 g / 10.4 N
15 mm Stal (~0.2) 0.43 kg / 0.96 LBS
434.0 g / 4.3 N
20 mm Stal (~0.2) 0.19 kg / 0.42 LBS
192.0 g / 1.9 N
30 mm Stal (~0.2) 0.05 kg / 0.10 LBS
46.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
The following data calculates the approximate weight limit necessary to initiate the slippage of the magnet vertically against a upright metal surface (assuming standard friction). The holding force is relative to the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x20x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
9.00 kg / 19.83 LBS
8997.0 g / 88.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.00 kg / 6.61 LBS
2999.0 g / 29.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
15.00 kg / 33.06 LBS
14995.0 g / 147.1 N
When hanging a element on a upright plane (e.g., a car body), it will only hold only about 20%-30% of nominal attraction strength. Gravitational force as well as a low friction coefficient cause that holders move down faster than they pull off. Planning a vertical fastening? Consider that the shear force is noticeably lower than the perpendicular breakaway force. On a slippery surface, the element will slip down under a much lighter load. Application of an anti-slip layer can drastically raise the stability.

Table 4: Material efficiency (saturation) - power losses
MPL 50x20x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.50 kg / 3.31 LBS
1499.5 g / 14.7 N
1 mm
13%
 3.75 kg / 8.26 LBS
3748.8 g / 36.8 N
2 mm
25%
 7.50 kg / 16.53 LBS
7497.5 g / 73.6 N
3 mm
38%
 11.25 kg / 24.79 LBS
11246.3 g / 110.3 N
5 mm
63%
 18.74 kg / 41.32 LBS
18743.8 g / 183.9 N
10 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
11 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
12 mm
100%
 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
A too thin steel is incapable of absorb the full magnetic flux, which wastes potential of the holder. If you mount a strong magnet to a weak sheet, the magnetism will pass right through and the pull force will drop sharply. To utilize the maximum of this neodymium's power, you require a sufficiently solid piece of metal. The saturation effect means that on sheet metal structures (e.g., car bodies), the magnet holds weaker. We recommend selecting the steel cross-section according to the table below.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 50x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
 OK
40 °C -2.2% 29.33 kg / 64.66 LBS
29330.2 g / 287.7 N
 OK
60 °C -4.4% 28.67 kg / 63.21 LBS
28670.4 g / 281.3 N
80 °C -6.6% 28.01 kg / 61.75 LBS
28010.7 g / 274.8 N
100 °C -28.8% 21.35 kg / 47.07 LBS
21352.9 g / 209.5 N
Standard neodymium magnets lose power above the temperature limit. Avoid high temperatures – high temperature can irreversibly destroy this magnet. With increasing heat, the neodymium's capacity briefly lowers. Avoid using this product close to ovens higher than its working range. Ignoring the limit will cause permanent loss of magnetism.
*Important note: Thermal stability 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. Red status in the table points to a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 50x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 70.06 kg / 154.45 LBS
4 789 Gs
10.51 kg / 23.17 LBS
10509 g / 103.1 N
 N/A
1 mm 65.83 kg / 145.13 LBS
6 535 Gs
9.87 kg / 21.77 LBS
9874 g / 96.9 N
 59.25 kg / 130.61 LBS
~0 Gs
2 mm 61.49 kg / 135.57 LBS
6 316 Gs
9.22 kg / 20.34 LBS
9224 g / 90.5 N
 55.34 kg / 122.01 LBS
~0 Gs
3 mm 57.20 kg / 126.10 LBS
6 092 Gs
8.58 kg / 18.92 LBS
8580 g / 84.2 N
 51.48 kg / 113.49 LBS
~0 Gs
5 mm 48.94 kg / 107.89 LBS
5 635 Gs
7.34 kg / 16.18 LBS
7341 g / 72.0 N
 44.05 kg / 97.10 LBS
~0 Gs
10 mm 31.64 kg / 69.76 LBS
4 531 Gs
4.75 kg / 10.46 LBS
4747 g / 46.6 N
 28.48 kg / 62.79 LBS
~0 Gs
20 mm 12.41 kg / 27.36 LBS
2 838 Gs
1.86 kg / 4.10 LBS
1862 g / 18.3 N
 11.17 kg / 24.63 LBS
~0 Gs
50 mm 1.07 kg / 2.35 LBS
832 Gs
0.16 kg / 0.35 LBS
160 g / 1.6 N
 0.96 kg / 2.12 LBS
~0 Gs
60 mm 0.54 kg / 1.19 LBS
592 Gs
0.08 kg / 0.18 LBS
81 g / 0.8 N
 0.49 kg / 1.07 LBS
~0 Gs
70 mm 0.29 kg / 0.64 LBS
433 Gs
0.04 kg / 0.10 LBS
43 g / 0.4 N
 0.26 kg / 0.57 LBS
~0 Gs
80 mm 0.16 kg / 0.36 LBS
324 Gs
0.02 kg / 0.05 LBS
24 g / 0.2 N
 0.15 kg / 0.32 LBS
~0 Gs
90 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
100 mm 0.06 kg / 0.13 LBS
194 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.05 kg / 0.11 LBS
~0 Gs
Two magnets interact from a significantly greater distance than a neodymium and metal setup. The setup of magnet-to-magnet generates a stronger field and a larger range of operation. Planning to create a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the impact force is huge. The levitation is a bit weaker than the attraction, but still large.
*Flux density for N-N configuration drops to ~0 Gs in the exact middle of the gap (caused by magnetic field nullification).
Attention: Estimates apply to sliding force of dual matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Protective zones (implants) - warnings
MPL 50x20x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 15.5 cm
Hearing aid 10 Gs (1.0 mT) 12.0 cm
Timepiece 20 Gs (2.0 mT) 9.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 7.5 cm
Remote 50 Gs (5.0 mT) 7.0 cm
Payment card 400 Gs (40.0 mT) 3.0 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Powerful magnet radiation is a real danger to IT equipment and pacemakers. These NdFeB products produce a field that destroys function of sensitive medical devices. Remember: the unseen radiation passes through tissues and plastic. Exceptional care must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - collision effects
MPL 50x20x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 22.29 km/h
(6.19 m/s)
 1.44 J
30 mm 35.10 km/h
(9.75 m/s)
 3.56 J
50 mm 45.12 km/h
(12.53 m/s)
 5.89 J
100 mm 63.77 km/h
(17.72 m/s)
 11.77 J
Magnetic elements are prone to chipping – a collision with steel risks their cracking. Pay attention to connection velocity – a neodymium left loose turns into a projectile. Impact energy can destroy the magnet or injury to skin. Hold the magnet firmly during bringing near metal so it doesn't hit violently against the steel surface. A collision at high speed means shattering of the magnet. Use safety goggles when playing with powerful specimens.

Table 9: Coating parameters (durability)
MPL 50x20x10 / 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. Note the thickness of the protective layer.

Table 10: Electrical data (Flux)
MPL 50x20x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 32 980 Mx 329.8 µWb
Pc Coefficient 0.38 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter in coil applications as well as sensors. Pc value determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 50x20x10 / N38

Environment Effective steel pull Effect
Air (land) 29.99 kg Standard
Water (riverbed) 34.34 kg
(+4.35 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Wall mount (shear)

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

2. Steel thickness impact

*Thin steel (e.g. computer case) severely weakens 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 Pc (Permeance Coefficient) = 0.38

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 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.

Engineering data and GPSR
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%
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: 020165-2026
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Model MPL 50x20x10 / N38 features a flat shape and professional pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 29.99 kg), this product is available immediately from our warehouse in Poland. 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 50x20x10 / 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.
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 hanging tools on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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.
Standardly, the MPL 50x20x10 / N38 model is magnetized through the thickness (dimension 10 mm), which means that the N and S poles are located on its largest, flat surfaces. 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 10 mm (thickness). The key parameter here is the holding force amounting to approximately 29.99 kg (force ~294.15 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of neodymium magnets.

Strengths

Besides their immense strength, neodymium magnets offer the following advantages:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external field sources,
  • In other words, due to the glossy finish of gold, the element gains a professional look,
  • The surface of neodymium magnets generates a powerful magnetic field – this is one of their assets,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for action at temperatures reaching 230°C and above...
  • Possibility of custom modeling as well as optimizing to individual needs,
  • Key role in high-tech industry – they serve a role in magnetic memories, electric drive systems, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Weaknesses

Disadvantages of neodymium magnets:
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
  • Neodymium magnets lose their power 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 durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • We suggest cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Furthermore, small components of these products are able to complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Optimal lifting capacity of a neodymium magnet – what it depends on?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • on a block made of mild steel, perfectly concentrating the magnetic flux
  • whose thickness equals approx. 10 mm
  • with an polished contact surface
  • without any insulating layer between the magnet and steel
  • during pulling in a direction perpendicular to the mounting surface
  • at room temperature

Determinants of lifting force in real conditions

In practice, the actual holding force depends on a number of factors, presented from crucial:
  • Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, reducing force.
  • Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance between the magnet’s surface and the plate reduces the load capacity.

Safety rules for work with neodymium magnets
Power loss in heat

Keep cool. Neodymium magnets are susceptible to heat. If you require operation above 80°C, look for special high-temperature series (H, SH, UH).

Pacemakers

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

Material brittleness

Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them cracking into shards.

Swallowing risk

Absolutely keep magnets away from children. Risk of swallowing is high, and the effects of magnets clamping inside the body are fatal.

GPS and phone interference

Remember: rare earth magnets produce a field that disrupts sensitive sensors. Maintain a separation from your phone, tablet, and navigation systems.

Safe operation

Handle with care. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.

Nickel coating and allergies

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

Hand protection

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

Magnetic media

Device Safety: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).

Dust is flammable

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

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