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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 of the product - 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 - technical parameters

The following data constitute the outcome of a physical calculation. Values are based on models for the class Nd2Fe14B. Real-world parameters may differ. Treat these calculations as a supplementary guide 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 lbs
90530.0 g / 888.1 N
dangerous!
1 mm 3999 Gs
399.9 mT
84.79 kg / 186.94 lbs
84794.0 g / 831.8 N
dangerous!
2 mm 3861 Gs
386.1 mT
79.04 kg / 174.25 lbs
79038.6 g / 775.4 N
dangerous!
3 mm 3720 Gs
372.0 mT
73.38 kg / 161.78 lbs
73381.8 g / 719.9 N
dangerous!
5 mm 3435 Gs
343.5 mT
62.56 kg / 137.93 lbs
62564.2 g / 613.8 N
dangerous!
10 mm 2742 Gs
274.2 mT
39.87 kg / 87.90 lbs
39868.7 g / 391.1 N
dangerous!
15 mm 2137 Gs
213.7 mT
24.21 kg / 53.37 lbs
24210.4 g / 237.5 N
dangerous!
20 mm 1649 Gs
164.9 mT
14.41 kg / 31.77 lbs
14409.9 g / 141.4 N
dangerous!
30 mm 988 Gs
98.8 mT
5.17 kg / 11.40 lbs
5170.9 g / 50.7 N
strong
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 lbs
845.8 g / 8.3 N
safe

Table 2: Vertical force (vertical surface)
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: Wall mounting (sliding) - behavior on slippery surfaces
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: Material efficiency (substrate influence) - 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 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 (stability) - power drop
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: Two magnets (repulsion) - forces in the system
MPL 50x50x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral 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: Protective zones (electronics) - precautionary measures
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
Timepiece 20 Gs (2.0 mT) 17.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 13.5 cm
Car key 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) - warning
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: Surface protection spec
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: Hydrostatics and buoyancy
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%
Warning: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
1. Wall mount (shear)

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

2. Efficiency vs thickness

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

3. Heat tolerance

*For N38 material, 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.

Technical and environmental data
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
Measurement Calculator
Pulling force

Magnetic Field

See also products

This product is a very powerful 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. This magnetic block with a force of 888.15 N is ready for shipment in 24h, allowing for rapid realization of your project. Furthermore, its Ni-Cu-Ni coating secures 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. To separate the MPL 50x50x25 / 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.
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. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
For mounting flat magnets MPL 50x50x25 / N38, it is best to use 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).
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.

Strengths as well as weaknesses of rare earth magnets.

Pros

Apart from their notable magnetism, neodymium magnets have these key benefits:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
  • A magnet with a shiny gold surface has an effective appearance,
  • They are known for high magnetic induction at the operating surface, which improves attraction properties,
  • Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Thanks to the possibility of free forming and customization to specialized solutions, NdFeB magnets can be modeled in a broad palette of forms and dimensions, which makes them more universal,
  • Significant place in advanced technology sectors – they find application in magnetic memories, electric drive systems, medical devices, and industrial machines.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Weaknesses

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • At very strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • 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. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We suggest a housing - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated shapes.
  • Potential hazard related to microscopic parts of magnets can be dangerous, if swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Holding force characteristics

Magnetic strength at its maximum – what it depends on?

Breakaway force was defined for optimal configuration, assuming:
  • on a block made of mild steel, perfectly concentrating the magnetic field
  • with a thickness minimum 10 mm
  • with a plane cleaned and smooth
  • without any air gap between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at standard ambient temperature

Practical aspects of lifting capacity – factors

Holding efficiency is influenced by specific conditions, including (from priority):
  • Clearance – existence of foreign body (paint, dirt, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
  • Plate thickness – too thin sheet does not close the flux, causing part of the power to be lost to the other side.
  • Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
  • Smoothness – full contact is possible only on polished steel. Rough texture create air cushions, weakening the magnet.
  • Temperature influence – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the holding force.

H&S for magnets
Fragile material

NdFeB magnets are ceramic materials, which means they are prone to chipping. Collision of two magnets leads to them breaking into shards.

Compass and GPS

GPS units and mobile phones are highly susceptible to magnetism. Direct contact with a strong magnet can ruin the sensors in your phone.

Data carriers

Avoid bringing magnets near a wallet, laptop, or TV. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Flammability

Dust created during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.

Keep away from children

Strictly store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are very dangerous.

Metal Allergy

It is widely known that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or opt for versions in plastic housing.

Health Danger

Individuals with a ICD must keep an large gap from magnets. The magnetism can disrupt the operation of the implant.

Heat sensitivity

Standard neodymium magnets (N-type) lose magnetization when the temperature surpasses 80°C. Damage is permanent.

Serious injuries

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

Conscious usage

Be careful. Rare earth magnets act from a distance and snap with massive power, often quicker than you can react.

Warning! Need more info? Check our post: Are neodymium magnets dangerous?
Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98