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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 - 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

Technical simulation of the product - data

These values are the direct effect of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (force vs gap) - interaction chart
MPL 50x50x25 / N38

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

Table 2: Shear hold (vertical surface)
MPL 50x50x25 / N38

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

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

Surface type Friction coefficient / % Mocy Max load (kg)
Raw steel
µ = 0.3 30% Nominalnej Siły
27.16 kg / 27159.0 g
266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 18106.0 g
177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 9053.0 g
88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 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)
0.5 mm
3%
3.02 kg / 3017.7 g
29.6 N
1 mm
8%
7.54 kg / 7544.2 g
74.0 N
2 mm
17%
15.09 kg / 15088.3 g
148.0 N
5 mm
42%
37.72 kg / 37720.8 g
370.0 N
10 mm
83%
75.44 kg / 75441.7 g
740.1 N

Table 5: Working in heat (stability) - resistance threshold
MPL 50x50x25 / N38

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

Table 6: Two magnets (attraction) - field range
MPL 50x50x25 / N38

Gap (mm) Attraction (kg) (N-S) Repulsion (kg) (N-N)
0 mm 263.15 kg / 263147 g
2581.5 N
5 403 Gs
N/A
1 mm 254.89 kg / 254892 g
2500.5 N
8 133 Gs
229.40 kg / 229403 g
2250.4 N
~0 Gs
2 mm 246.47 kg / 246473 g
2417.9 N
7 998 Gs
221.83 kg / 221826 g
2176.1 N
~0 Gs
3 mm 238.08 kg / 238083 g
2335.6 N
7 861 Gs
214.28 kg / 214275 g
2102.0 N
~0 Gs
5 mm 221.48 kg / 221477 g
2172.7 N
7 582 Gs
199.33 kg / 199329 g
1955.4 N
~0 Gs
10 mm 181.86 kg / 181858 g
1784.0 N
6 870 Gs
163.67 kg / 163672 g
1605.6 N
~0 Gs
20 mm 115.89 kg / 115888 g
1136.9 N
5 484 Gs
104.30 kg / 104299 g
1023.2 N
~0 Gs
50 mm 24.93 kg / 24933 g
244.6 N
2 544 Gs
22.44 kg / 22440 g
220.1 N
~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
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: Impact energy (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: Anti-corrosion coating 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: Electrical 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%
Corrosion warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
1. Shear force

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

2. Steel thickness impact

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

3. Power loss vs temp

*For standard magnets, the critical limit is 80°C.

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

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

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 and environmental data
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%
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: 020168-2025
Magnet Unit Converter
Pulling force

Field Strength

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This product is an extremely strong magnet in the shape of a plate 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 off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating block magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. 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 invisible mounts under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x50x25 / 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. 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 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. 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 product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Benefits

Apart from their consistent magnetism, neodymium magnets have these key benefits:
  • They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
  • They do not lose their magnetic properties even under strong external field,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
  • Magnetic induction on the working part of the magnet remains strong,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Considering the option of accurate forming and customization to individualized solutions, neodymium magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in future technologies – they are used in magnetic memories, electric motors, diagnostic systems, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages

Problematic aspects of neodymium magnets: application proposals
  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Lifting parameters

Best holding force of the magnet in ideal parameterswhat affects it?

The declared magnet strength represents the limit force, measured under optimal environment, meaning:
  • on a block made of structural steel, perfectly concentrating the magnetic field
  • whose thickness reaches at least 10 mm
  • with an ground touching surface
  • under conditions of no distance (metal-to-metal)
  • for force applied at a right angle (pull-off, not shear)
  • in stable room temperature

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity depends on many variables, ranked from the most important:
  • Clearance – existence of any layer (paint, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
  • Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets
Magnetic interference

GPS units and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Do not underestimate power

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

Dust is flammable

Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.

Thermal limits

Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Serious injuries

Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.

Magnets are brittle

Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.

Avoid contact if allergic

Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.

Danger to the youngest

Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.

Health Danger

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Safe distance

Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).

Danger! 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