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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

14.56 with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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Product card - 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

Engineering simulation of the assembly - report

The following data constitute the direct effect of a physical simulation. Values rely on models for the material Nd2Fe14B. Actual conditions might slightly differ. Treat these calculations as a reference point for designers.

Table 1: Static force (force vs distance) - power drop
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 pounds
12690.0 g / 124.5 N
dangerous!
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 pounds
11530.3 g / 113.1 N
dangerous!
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 pounds
10199.9 g / 100.1 N
dangerous!
3 mm 1649 Gs
164.9 mT
8.83 kg / 19.47 pounds
8831.3 g / 86.6 N
medium risk
5 mm 1395 Gs
139.5 mT
6.32 kg / 13.93 pounds
6320.3 g / 62.0 N
medium risk
10 mm 870 Gs
87.0 mT
2.46 kg / 5.42 pounds
2459.4 g / 24.1 N
medium risk
15 mm 549 Gs
54.9 mT
0.98 kg / 2.15 pounds
976.9 g / 9.6 N
safe
20 mm 359 Gs
35.9 mT
0.42 kg / 0.92 pounds
418.9 g / 4.1 N
safe
30 mm 172 Gs
17.2 mT
0.10 kg / 0.21 pounds
95.7 g / 0.9 N
safe
50 mm 54 Gs
5.4 mT
0.01 kg / 0.02 pounds
9.5 g / 0.1 N
safe

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

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 pounds
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 pounds
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 pounds
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 pounds
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 pounds
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 pounds
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 pounds
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 pounds
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 pounds
2.0 g / 0.0 N

Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
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 pounds
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 pounds
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 pounds
6345.0 g / 62.2 N

Table 4: Steel thickness (substrate influence) - 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 pounds
634.5 g / 6.2 N
1 mm
13%
1.59 kg / 3.50 pounds
1586.3 g / 15.6 N
2 mm
25%
3.17 kg / 6.99 pounds
3172.5 g / 31.1 N
3 mm
38%
4.76 kg / 10.49 pounds
4758.8 g / 46.7 N
5 mm
63%
7.93 kg / 17.49 pounds
7931.2 g / 77.8 N
10 mm
100%
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
11 mm
100%
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
12 mm
100%
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N

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

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
OK
40 °C -2.2% 12.41 kg / 27.36 pounds
12410.8 g / 121.8 N
OK
60 °C -4.4% 12.13 kg / 26.75 pounds
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 pounds
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 pounds
9035.3 g / 88.6 N

Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 pounds
3 371 Gs
3.61 kg / 7.97 pounds
3614 g / 35.5 N
N/A
1 mm 23.06 kg / 50.84 pounds
3 868 Gs
3.46 kg / 7.63 pounds
3459 g / 33.9 N
20.75 kg / 45.75 pounds
~0 Gs
2 mm 21.89 kg / 48.27 pounds
3 769 Gs
3.28 kg / 7.24 pounds
3284 g / 32.2 N
19.71 kg / 43.44 pounds
~0 Gs
3 mm 20.65 kg / 45.53 pounds
3 661 Gs
3.10 kg / 6.83 pounds
3098 g / 30.4 N
18.59 kg / 40.98 pounds
~0 Gs
5 mm 18.07 kg / 39.83 pounds
3 424 Gs
2.71 kg / 5.97 pounds
2710 g / 26.6 N
16.26 kg / 35.84 pounds
~0 Gs
10 mm 12.00 kg / 26.46 pounds
2 790 Gs
1.80 kg / 3.97 pounds
1800 g / 17.7 N
10.80 kg / 23.81 pounds
~0 Gs
20 mm 4.67 kg / 10.30 pounds
1 741 Gs
0.70 kg / 1.54 pounds
701 g / 6.9 N
4.20 kg / 9.27 pounds
~0 Gs
50 mm 0.37 kg / 0.81 pounds
488 Gs
0.06 kg / 0.12 pounds
55 g / 0.5 N
0.33 kg / 0.73 pounds
~0 Gs
60 mm 0.18 kg / 0.40 pounds
343 Gs
0.03 kg / 0.06 pounds
27 g / 0.3 N
0.16 kg / 0.36 pounds
~0 Gs
70 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
80 mm 0.05 kg / 0.12 pounds
184 Gs
0.01 kg / 0.02 pounds
8 g / 0.1 N
0.05 kg / 0.10 pounds
~0 Gs
90 mm 0.03 kg / 0.07 pounds
140 Gs
0.00 kg / 0.01 pounds
5 g / 0.0 N
0.03 kg / 0.06 pounds
~0 Gs
100 mm 0.02 kg / 0.04 pounds
108 Gs
0.00 kg / 0.01 pounds
3 g / 0.0 N
0.02 kg / 0.04 pounds
~0 Gs

Table 7: Hazards (implants) - 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
Timepiece 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

Table 8: Dynamics (cracking risk) - warning
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

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)

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)

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.
1. Shear force

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

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) severely limits the holding force.

3. Thermal stability

*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) = 0.21

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 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
Elemental analysis
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
Quick Unit Converter
Force (pull)

Magnetic Field

Other proposals

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. Furthermore, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is shifting 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. Watch your fingers! Magnets with a force of 12.69 kg can pinch very hard and cause hematomas. 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.
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. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 50x20x5 / N38 model is magnetized axially (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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
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 product meets the standards for N38 grade magnets.

Advantages as well as disadvantages of neodymium magnets.

Strengths

Apart from their superior power, neodymium magnets have these key benefits:
  • They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
  • Neodymium magnets are highly resistant to loss of magnetic properties caused by external field sources,
  • The use of an shiny coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Magnets possess excellent magnetic induction on the outer layer,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
  • Thanks to flexibility in forming and the capacity to modify to complex applications,
  • Key role in high-tech industry – they are utilized in data components, motor assemblies, advanced medical instruments, and technologically advanced constructions.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in compact constructions

Limitations

Disadvantages of NdFeB 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 improves its resistance to damage
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complex forms.
  • Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to be problematic in diagnostics medical in case of swallowing.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Best holding force of the magnet in ideal parameterswhat contributes to it?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:
  • using a plate made of mild steel, acting as a ideal flux conductor
  • possessing a massiveness of at least 10 mm to avoid saturation
  • with a surface cleaned and smooth
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the mounting surface
  • in stable room temperature

Practical lifting capacity: influencing factors

Please note that the application force may be lower depending on the following factors, starting with the most relevant:
  • Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds much less (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.
  • Steel grade – the best choice is high-permeability steel. Cast iron may generate lower lifting capacity.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
  • Thermal environment – 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, however under parallel forces the lifting capacity is smaller. In addition, even a small distance between the magnet’s surface and the plate decreases the holding force.

Warnings
Eye protection

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Swallowing risk

Adult use only. Small elements pose a choking risk, causing intestinal necrosis. Keep away from kids and pets.

Thermal limits

Regular neodymium magnets (grade N) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.

Pacemakers

Warning for patients: Strong magnetic fields affect medical devices. Keep at least 30 cm distance or request help to work with the magnets.

Finger safety

Pinching hazard: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.

Threat to navigation

Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Fire risk

Machining of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Immense force

Be careful. Rare earth magnets attract from a long distance and snap with huge force, often faster than you can move away.

Nickel allergy

It is widely known that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or choose encased magnets.

Electronic hazard

Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of at least 10 cm.

Attention! Details about risks in the article: Magnet Safety Guide.
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98