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MPL 50x50x25 / N38 - lamellar magnet

lamellar magnet

Catalog no 020168

GTIN/EAN: 5906301811749

length

50 mm [±0,1 mm]

Width

50 mm [±0,1 mm]

Height

25 mm [±0,1 mm]

Weight

468.75 g

Magnetization Direction

↑ axial

Load capacity

90.53 kg / 888.15 N

Magnetic Induction

413.25 mT / 4133 Gs

Coating

[NiCuNi] Nickel

159.90 with VAT / pcs + price for transport

130.00 ZŁ net + 23% VAT / pcs

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Technical parameters - MPL 50x50x25 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x25 / N38 - lamellar magnet

properties
properties values
Cat. no. 020168
GTIN/EAN 5906301811749
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 50 mm [±0,1 mm]
Height 25 mm [±0,1 mm]
Weight 468.75 g
Magnetization Direction ↑ axial
Load capacity ~ ? 90.53 kg / 888.15 N
Magnetic Induction ~ ? 413.25 mT / 4133 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x25 / 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 simulation of the magnet - data

Presented values are the direct effect of a mathematical simulation. Values were calculated on models for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (pull vs gap) - characteristics
MPL 50x50x25 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4132 Gs
413.2 mT
90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
critical level
1 mm 3999 Gs
399.9 mT
84.79 kg / 186.94 pounds
84794.0 g / 831.8 N
critical level
2 mm 3861 Gs
386.1 mT
79.04 kg / 174.25 pounds
79038.6 g / 775.4 N
critical level
3 mm 3720 Gs
372.0 mT
73.38 kg / 161.78 pounds
73381.8 g / 719.9 N
critical level
5 mm 3435 Gs
343.5 mT
62.56 kg / 137.93 pounds
62564.2 g / 613.8 N
critical level
10 mm 2742 Gs
274.2 mT
39.87 kg / 87.90 pounds
39868.7 g / 391.1 N
critical level
15 mm 2137 Gs
213.7 mT
24.21 kg / 53.37 pounds
24210.4 g / 237.5 N
critical level
20 mm 1649 Gs
164.9 mT
14.41 kg / 31.77 pounds
14409.9 g / 141.4 N
critical level
30 mm 988 Gs
98.8 mT
5.17 kg / 11.40 pounds
5170.9 g / 50.7 N
warning
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 pounds
845.8 g / 8.3 N
safe

Table 2: Sliding hold (wall)
MPL 50x50x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
1 mm Stal (~0.2) 16.96 kg / 37.39 pounds
16958.0 g / 166.4 N
2 mm Stal (~0.2) 15.81 kg / 34.85 pounds
15808.0 g / 155.1 N
3 mm Stal (~0.2) 14.68 kg / 32.36 pounds
14676.0 g / 144.0 N
5 mm Stal (~0.2) 12.51 kg / 27.58 pounds
12512.0 g / 122.7 N
10 mm Stal (~0.2) 7.97 kg / 17.58 pounds
7974.0 g / 78.2 N
15 mm Stal (~0.2) 4.84 kg / 10.67 pounds
4842.0 g / 47.5 N
20 mm Stal (~0.2) 2.88 kg / 6.35 pounds
2882.0 g / 28.3 N
30 mm Stal (~0.2) 1.03 kg / 2.28 pounds
1034.0 g / 10.1 N
50 mm Stal (~0.2) 0.17 kg / 0.37 pounds
170.0 g / 1.7 N

Table 3: Wall mounting (shearing) - vertical pull
MPL 50x50x25 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.16 kg / 59.88 pounds
27159.0 g / 266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 19.96 pounds
9053.0 g / 88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 99.79 pounds
45265.0 g / 444.0 N

Table 4: Steel thickness (saturation) - power losses
MPL 50x50x25 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
3%
3.02 kg / 6.65 pounds
3017.7 g / 29.6 N
1 mm
8%
7.54 kg / 16.63 pounds
7544.2 g / 74.0 N
2 mm
17%
15.09 kg / 33.26 pounds
15088.3 g / 148.0 N
3 mm
25%
22.63 kg / 49.90 pounds
22632.5 g / 222.0 N
5 mm
42%
37.72 kg / 83.16 pounds
37720.8 g / 370.0 N
10 mm
83%
75.44 kg / 166.32 pounds
75441.7 g / 740.1 N
11 mm
92%
82.99 kg / 182.95 pounds
82985.8 g / 814.1 N
12 mm
100%
90.53 kg / 199.58 pounds
90530.0 g / 888.1 N

Table 5: Thermal resistance (stability) - resistance threshold
MPL 50x50x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
OK
40 °C -2.2% 88.54 kg / 195.19 pounds
88538.3 g / 868.6 N
OK
60 °C -4.4% 86.55 kg / 190.80 pounds
86546.7 g / 849.0 N
80 °C -6.6% 84.56 kg / 186.41 pounds
84555.0 g / 829.5 N
100 °C -28.8% 64.46 kg / 142.10 pounds
64457.4 g / 632.3 N

Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 50x50x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear Strength (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 263.15 kg / 580.14 pounds
5 403 Gs
39.47 kg / 87.02 pounds
39472 g / 387.2 N
N/A
1 mm 254.89 kg / 561.94 pounds
8 133 Gs
38.23 kg / 84.29 pounds
38234 g / 375.1 N
229.40 kg / 505.75 pounds
~0 Gs
2 mm 246.47 kg / 543.38 pounds
7 998 Gs
36.97 kg / 81.51 pounds
36971 g / 362.7 N
221.83 kg / 489.04 pounds
~0 Gs
3 mm 238.08 kg / 524.88 pounds
7 861 Gs
35.71 kg / 78.73 pounds
35713 g / 350.3 N
214.28 kg / 472.40 pounds
~0 Gs
5 mm 221.48 kg / 488.27 pounds
7 582 Gs
33.22 kg / 73.24 pounds
33222 g / 325.9 N
199.33 kg / 439.45 pounds
~0 Gs
10 mm 181.86 kg / 400.93 pounds
6 870 Gs
27.28 kg / 60.14 pounds
27279 g / 267.6 N
163.67 kg / 360.83 pounds
~0 Gs
20 mm 115.89 kg / 255.49 pounds
5 484 Gs
17.38 kg / 38.32 pounds
17383 g / 170.5 N
104.30 kg / 229.94 pounds
~0 Gs
50 mm 24.93 kg / 54.97 pounds
2 544 Gs
3.74 kg / 8.25 pounds
3740 g / 36.7 N
22.44 kg / 49.47 pounds
~0 Gs
60 mm 15.03 kg / 33.14 pounds
1 975 Gs
2.25 kg / 4.97 pounds
2255 g / 22.1 N
13.53 kg / 29.82 pounds
~0 Gs
70 mm 9.24 kg / 20.37 pounds
1 548 Gs
1.39 kg / 3.05 pounds
1386 g / 13.6 N
8.31 kg / 18.33 pounds
~0 Gs
80 mm 5.81 kg / 12.80 pounds
1 228 Gs
0.87 kg / 1.92 pounds
871 g / 8.5 N
5.23 kg / 11.52 pounds
~0 Gs
90 mm 3.74 kg / 8.24 pounds
985 Gs
0.56 kg / 1.24 pounds
560 g / 5.5 N
3.36 kg / 7.41 pounds
~0 Gs
100 mm 2.46 kg / 5.42 pounds
799 Gs
0.37 kg / 0.81 pounds
369 g / 3.6 N
2.21 kg / 4.88 pounds
~0 Gs

Table 7: Safety (HSE) (electronics) - warnings
MPL 50x50x25 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 28.0 cm
Hearing aid 10 Gs (1.0 mT) 22.0 cm
Mechanical watch 20 Gs (2.0 mT) 17.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 13.5 cm
Remote 50 Gs (5.0 mT) 12.5 cm
Payment card 400 Gs (40.0 mT) 5.0 cm
HDD hard drive 600 Gs (60.0 mT) 4.5 cm

Table 8: Collisions (kinetic energy) - collision effects
MPL 50x50x25 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.45 km/h
(4.85 m/s)
5.51 J
30 mm 25.13 km/h
(6.98 m/s)
11.42 J
50 mm 31.52 km/h
(8.76 m/s)
17.97 J
100 mm 44.33 km/h
(12.31 m/s)
35.54 J

Table 9: Coating parameters (durability)
MPL 50x50x25 / 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 50x50x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 105 093 Mx 1050.9 µWb
Pc Coefficient 0.54 Low (Flat)

Table 11: Underwater work (magnet fishing)
MPL 50x50x25 / N38

Environment Effective steel pull Effect
Air (land) 90.53 kg Standard
Water (riverbed) 103.66 kg
(+13.13 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. Sliding resistance

*Warning: On a vertical wall, the magnet holds merely a fraction of its nominal pull.

2. Efficiency vs thickness

*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.

3. Heat tolerance

*For standard magnets, the max working temp is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54

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.

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: 020168-2026
Measurement Calculator
Force (pull)

Magnetic Field

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This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 50x50x25 mm and a weight of 468.75 g, guarantees the highest quality connection. As a magnetic bar with high power (approx. 90.53 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.
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. Watch your fingers! Magnets with a force of 90.53 kg can pinch very hard and cause hematomas. Never use metal tools for prying, as the brittle NdFeB material may chip and damage your eyes.
Plate magnets MPL 50x50x25 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. 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 50x50x25 / N38 model is magnetized axially (dimension 25 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 (50x50 mm), which is ideal for flat mounting. 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), 50 mm (width), and 25 mm (thickness). It is a magnetic block with dimensions 50x50x25 mm and a self-weight of 468.75 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of rare earth magnets.

Benefits

Apart from their consistent holding force, neodymium magnets have these key benefits:
  • They do not lose strength, even over approximately 10 years – the reduction in lifting capacity is only ~1% (according to tests),
  • They do not lose their magnetic properties even under external field action,
  • A magnet with a shiny gold surface has better aesthetics,
  • They feature high magnetic induction at the operating surface, making them more effective,
  • 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 the option of precise forming and customization to specialized needs, neodymium magnets can be modeled in a broad palette of geometric configurations, which amplifies use scope,
  • Universal use in high-tech industry – they serve a role in computer drives, brushless drives, precision medical tools, as well as multitasking production systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Limitations

Disadvantages of neodymium magnets:
  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Limited ability of creating nuts in the magnet and complex forms - recommended is casing - mounting mechanism.
  • Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is a challenge,

Pull force analysis

Maximum holding power of the magnet – what affects it?

The declared magnet strength refers to the peak performance, recorded under optimal environment, meaning:
  • on a base made of structural steel, perfectly concentrating the magnetic field
  • with a cross-section of at least 10 mm
  • with a surface perfectly flat
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at ambient temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding will differ influenced by elements below, in order of importance:
  • Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the holding force.

Warnings
Dust explosion hazard

Mechanical processing of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Data carriers

Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.

Caution required

Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.

Magnets are brittle

Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.

Bodily injuries

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

Operating temperature

Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).

Nickel allergy

Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.

Medical implants

Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.

GPS Danger

A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to avoid breaking the sensors.

Choking Hazard

Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98