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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

bulk discounts:

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price from 1 pcs
130.00 ZŁ
159.90 ZŁ
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Parameters and structure of a neodymium magnet can be checked with our our magnetic calculator.

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Technical specification - 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

Engineering simulation of the magnet - report

Presented values are the outcome of a engineering calculation. Values are based on models for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a preliminary roadmap when designing systems.

Table 1: Static force (force vs distance) - power drop
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 lbs
90530.0 g / 888.1 N
critical level
1 mm 3999 Gs
399.9 mT
84.79 kg / 186.94 lbs
84794.0 g / 831.8 N
critical level
2 mm 3861 Gs
386.1 mT
79.04 kg / 174.25 lbs
79038.6 g / 775.4 N
critical level
3 mm 3720 Gs
372.0 mT
73.38 kg / 161.78 lbs
73381.8 g / 719.9 N
critical level
5 mm 3435 Gs
343.5 mT
62.56 kg / 137.93 lbs
62564.2 g / 613.8 N
critical level
10 mm 2742 Gs
274.2 mT
39.87 kg / 87.90 lbs
39868.7 g / 391.1 N
critical level
15 mm 2137 Gs
213.7 mT
24.21 kg / 53.37 lbs
24210.4 g / 237.5 N
critical level
20 mm 1649 Gs
164.9 mT
14.41 kg / 31.77 lbs
14409.9 g / 141.4 N
critical level
30 mm 988 Gs
98.8 mT
5.17 kg / 11.40 lbs
5170.9 g / 50.7 N
warning
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 lbs
845.8 g / 8.3 N
weak grip

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

Table 3: Vertical assembly (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 lbs
27159.0 g / 266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 39.92 lbs
18106.0 g / 177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 19.96 lbs
9053.0 g / 88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 99.79 lbs
45265.0 g / 444.0 N

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x50x25 / N38

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

Table 5: Thermal resistance (material behavior) - 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 lbs
90530.0 g / 888.1 N
OK
40 °C -2.2% 88.54 kg / 195.19 lbs
88538.3 g / 868.6 N
OK
60 °C -4.4% 86.55 kg / 190.80 lbs
86546.7 g / 849.0 N
80 °C -6.6% 84.56 kg / 186.41 lbs
84555.0 g / 829.5 N
100 °C -28.8% 64.46 kg / 142.10 lbs
64457.4 g / 632.3 N

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

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

Table 7: Hazards (implants) - 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
Mobile device 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: Impact energy (cracking risk) - 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 (Flux)
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%
Corrosion warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
1. Wall mount (shear)

*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its nominal pull.

2. Efficiency vs thickness

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Thermal stability

*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) = 0.54

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%
Environmental data
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
Magnet Unit Converter
Force (pull)

Magnetic Induction

Other deals

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 premium class connection. This magnetic block with a force of 888.15 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 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 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. Thanks to the flat surface and high force (approx. 90.53 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
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. 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 50 mm (width), and 25 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 90.53 kg (force ~888.15 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of Nd2Fe14B magnets.

Pros

Besides their high retention, neodymium magnets are valued for these benefits:
  • Their strength remains stable, and after around 10 years it drops only by ~1% (according to research),
  • They show high resistance to demagnetization induced by external disturbances,
  • A magnet with a shiny gold surface is more attractive,
  • They are known for high magnetic induction at the operating surface, which increases their power,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
  • Thanks to the potential of accurate forming and customization to unique projects, neodymium magnets can be manufactured in a wide range of geometric configurations, which makes them more universal,
  • Significant place in innovative solutions – they are used in mass storage devices, electric drive systems, medical devices, as well as other advanced devices.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Limitations

Disadvantages of neodymium magnets:
  • At very strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in creating nuts and complex shapes in magnets, we propose using a housing - magnetic holder.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these magnets can be problematic in diagnostics medical after entering the body.
  • With budget limitations the cost of neodymium magnets is a challenge,

Lifting parameters

Optimal lifting capacity of a neodymium magnetwhat it depends on?

The force parameter is a theoretical maximum value performed under specific, ideal conditions:
  • using a sheet made of mild steel, acting as a ideal flux conductor
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • without any clearance between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at ambient temperature room level

Lifting capacity in real conditions – factors

It is worth knowing that the application force may be lower influenced by the following factors, in order of importance:
  • Gap (betwixt the magnet and the plate), as even a very small clearance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
  • Angle of force application – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the plate is typically 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.
  • Chemical composition of the base – mild steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
  • Thermal environment – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the load capacity.

Warnings
Nickel coating and allergies

A percentage of the population experience a sensitization to Ni, which is the standard coating for neodymium magnets. Extended handling can result in skin redness. It is best to use safety gloves.

GPS Danger

An intense magnetic field interferes with the operation of magnetometers in smartphones and GPS navigation. Do not bring magnets close to a smartphone to avoid damaging the sensors.

Fire warning

Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.

Protect data

Intense magnetic fields can corrupt files on credit cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Thermal limits

Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and pulling force.

Powerful field

Handle with care. Neodymium magnets attract from a distance and snap with huge force, often faster than you can move away.

Do not give to children

Always keep magnets out of reach of children. Choking hazard is significant, and the consequences of magnets clamping inside the body are tragic.

Medical implants

Individuals with a heart stimulator should keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.

Bone fractures

Large magnets can crush fingers instantly. Under no circumstances place your hand betwixt two attracting surfaces.

Protective goggles

Despite the nickel coating, the material is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Safety First! Looking for details? Read our article: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98