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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

43.05 with VAT / pcs + price for transport

35.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Physical properties - 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 modeling of the magnet - data

These values constitute the outcome of a engineering analysis. Results are based on models for the material Nd2Fe14B. Operational conditions may differ from theoretical values. Use these calculations as a reference point during assembly planning.

Table 1: Static pull force (force vs gap) - interaction chart
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 pounds
29990.0 g / 294.2 N
critical level
1 mm 3158 Gs
315.8 mT
26.32 kg / 58.03 pounds
26323.3 g / 258.2 N
critical level
2 mm 2932 Gs
293.2 mT
22.69 kg / 50.02 pounds
22687.6 g / 222.6 N
critical level
3 mm 2703 Gs
270.3 mT
19.29 kg / 42.52 pounds
19286.7 g / 189.2 N
critical level
5 mm 2266 Gs
226.6 mT
13.55 kg / 29.86 pounds
13546.3 g / 132.9 N
critical level
10 mm 1419 Gs
141.9 mT
5.31 kg / 11.71 pounds
5313.0 g / 52.1 N
warning
15 mm 908 Gs
90.8 mT
2.17 kg / 4.79 pounds
2174.5 g / 21.3 N
warning
20 mm 603 Gs
60.3 mT
0.96 kg / 2.12 pounds
961.0 g / 9.4 N
safe
30 mm 296 Gs
29.6 mT
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
safe
50 mm 97 Gs
9.7 mT
0.02 kg / 0.05 pounds
24.8 g / 0.2 N
safe

Table 2: Shear force (wall)
MPL 50x20x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
1 mm Stal (~0.2) 5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
2 mm Stal (~0.2) 4.54 kg / 10.00 pounds
4538.0 g / 44.5 N
3 mm Stal (~0.2) 3.86 kg / 8.51 pounds
3858.0 g / 37.8 N
5 mm Stal (~0.2) 2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
10 mm Stal (~0.2) 1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
15 mm Stal (~0.2) 0.43 kg / 0.96 pounds
434.0 g / 4.3 N
20 mm Stal (~0.2) 0.19 kg / 0.42 pounds
192.0 g / 1.9 N
30 mm Stal (~0.2) 0.05 kg / 0.10 pounds
46.0 g / 0.5 N
50 mm Stal (~0.2) 0.00 kg / 0.01 pounds
4.0 g / 0.0 N

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 pounds
8997.0 g / 88.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.00 kg / 6.61 pounds
2999.0 g / 29.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
15.00 kg / 33.06 pounds
14995.0 g / 147.1 N

Table 4: Material efficiency (substrate influence) - 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 pounds
1499.5 g / 14.7 N
1 mm
13%
3.75 kg / 8.26 pounds
3748.8 g / 36.8 N
2 mm
25%
7.50 kg / 16.53 pounds
7497.5 g / 73.6 N
3 mm
38%
11.25 kg / 24.79 pounds
11246.3 g / 110.3 N
5 mm
63%
18.74 kg / 41.32 pounds
18743.8 g / 183.9 N
10 mm
100%
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
11 mm
100%
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
12 mm
100%
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N

Table 5: Thermal stability (stability) - resistance threshold
MPL 50x20x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
OK
40 °C -2.2% 29.33 kg / 64.66 pounds
29330.2 g / 287.7 N
OK
60 °C -4.4% 28.67 kg / 63.21 pounds
28670.4 g / 281.3 N
80 °C -6.6% 28.01 kg / 61.75 pounds
28010.7 g / 274.8 N
100 °C -28.8% 21.35 kg / 47.07 pounds
21352.9 g / 209.5 N

Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 50x20x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 70.06 kg / 154.45 pounds
4 789 Gs
10.51 kg / 23.17 pounds
10509 g / 103.1 N
N/A
1 mm 65.83 kg / 145.13 pounds
6 535 Gs
9.87 kg / 21.77 pounds
9874 g / 96.9 N
59.25 kg / 130.61 pounds
~0 Gs
2 mm 61.49 kg / 135.57 pounds
6 316 Gs
9.22 kg / 20.34 pounds
9224 g / 90.5 N
55.34 kg / 122.01 pounds
~0 Gs
3 mm 57.20 kg / 126.10 pounds
6 092 Gs
8.58 kg / 18.92 pounds
8580 g / 84.2 N
51.48 kg / 113.49 pounds
~0 Gs
5 mm 48.94 kg / 107.89 pounds
5 635 Gs
7.34 kg / 16.18 pounds
7341 g / 72.0 N
44.05 kg / 97.10 pounds
~0 Gs
10 mm 31.64 kg / 69.76 pounds
4 531 Gs
4.75 kg / 10.46 pounds
4747 g / 46.6 N
28.48 kg / 62.79 pounds
~0 Gs
20 mm 12.41 kg / 27.36 pounds
2 838 Gs
1.86 kg / 4.10 pounds
1862 g / 18.3 N
11.17 kg / 24.63 pounds
~0 Gs
50 mm 1.07 kg / 2.35 pounds
832 Gs
0.16 kg / 0.35 pounds
160 g / 1.6 N
0.96 kg / 2.12 pounds
~0 Gs
60 mm 0.54 kg / 1.19 pounds
592 Gs
0.08 kg / 0.18 pounds
81 g / 0.8 N
0.49 kg / 1.07 pounds
~0 Gs
70 mm 0.29 kg / 0.64 pounds
433 Gs
0.04 kg / 0.10 pounds
43 g / 0.4 N
0.26 kg / 0.57 pounds
~0 Gs
80 mm 0.16 kg / 0.36 pounds
324 Gs
0.02 kg / 0.05 pounds
24 g / 0.2 N
0.15 kg / 0.32 pounds
~0 Gs
90 mm 0.10 kg / 0.21 pounds
248 Gs
0.01 kg / 0.03 pounds
14 g / 0.1 N
0.09 kg / 0.19 pounds
~0 Gs
100 mm 0.06 kg / 0.13 pounds
194 Gs
0.01 kg / 0.02 pounds
9 g / 0.1 N
0.05 kg / 0.11 pounds
~0 Gs

Table 7: Hazards (electronics) - precautionary measures
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
Mechanical watch 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

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

Table 9: Anti-corrosion coating 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)

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

Parameter Value SI Unit / Description
Magnetic Flux 32 980 Mx 329.8 µWb
Pc Coefficient 0.38 Low (Flat)

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%
Rust risk: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Vertical hold

*Note: On a vertical surface, the magnet holds merely a fraction of its perpendicular strength.

2. Steel thickness impact

*Thin steel (e.g. computer case) significantly weakens the holding force.

3. Power loss vs temp

*For N38 grade, 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
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: 020165-2026
Quick Unit Converter
Force (pull)

Magnetic Field

Other offers

Model MPL 50x20x10 / N38 features a low profile and industrial pulling force, making it a perfect solution for building separators and machines. This magnetic block with a force of 294.15 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.
The key to success is sliding the magnets along their largest connection plane (using e.g., the edge of a table), which is easier than trying to tear them apart directly. To separate the MPL 50x20x10 / 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. 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. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x20x10 / N38, we recommend utilizing two-component adhesives (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. For lighter applications or mounting on smooth surfaces, branded foam tape (e.g., 3M VHB) will work, provided the surface is perfectly degreased. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
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. 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 50x20x10 mm, which, at a weight of 75 g, makes it an element with high energy density. It is a magnetic block with dimensions 50x20x10 mm and a self-weight of 75 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Strengths

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their magnetic field is maintained, and after around ten years it decreases only by ~1% (according to research),
  • Magnets effectively defend themselves against demagnetization caused by foreign field sources,
  • Thanks to the elegant finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an elegant appearance,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which allows for strong attraction,
  • Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to versatility in constructing and the capacity to adapt to complex applications,
  • Fundamental importance in future technologies – they are utilized in data components, motor assemblies, medical equipment, also complex engineering applications.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Problematic aspects of neodymium magnets and ways of using them
  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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 resistant to moisture, in case of application outdoors
  • We suggest a housing - magnetic holder, due to difficulties in producing threads inside the magnet and complex forms.
  • Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price is relatively high,

Holding force characteristics

Maximum lifting capacity of the magnetwhat contributes to it?

The lifting capacity listed is a result of laboratory testing executed under standard conditions:
  • with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
  • with a thickness minimum 10 mm
  • with an polished contact surface
  • under conditions of gap-free contact (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

Holding efficiency impacted by specific conditions, including (from priority):
  • Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Plate thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped into the air.
  • Metal type – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature influence – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

Holding force was measured on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.

Precautions when working with neodymium magnets
Allergic reactions

Some people experience a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Extended handling may cause dermatitis. It is best to use protective gloves.

No play value

Product intended for adults. Tiny parts pose a choking risk, leading to severe trauma. Store away from children and animals.

Crushing force

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Be careful!

Dust explosion hazard

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Electronic hazard

Very strong magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.

Handling rules

Exercise caution. Rare earth magnets attract from a distance and snap with huge force, often quicker than you can react.

GPS Danger

Remember: rare earth magnets generate a field that interferes with precision electronics. Keep a separation from your phone, tablet, and navigation systems.

Protective goggles

Neodymium magnets are ceramic materials, which means they are very brittle. Clashing of two magnets will cause them cracking into small pieces.

Do not overheat magnets

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

Life threat

People with a heart stimulator must maintain an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.

Attention! Learn more about hazards in the article: Safety of working with magnets.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98