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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 details - 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 - data

The following values represent the direct effect of a physical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.

Table 1: Static force (pull vs gap) - 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
medium risk
50 mm 399 Gs
39.9 mT
0.85 kg / 1.86 LBS
845.8 g / 8.3 N
safe

Table 2: Slippage load (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: Vertical assembly (shearing) - 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) - 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 stability (material behavior) - 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: Magnet-Magnet interaction (repulsion) - field collision
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 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
Timepiece 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: 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 (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: Physics of underwater searching
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 surface, the magnet holds just approx. 20-30% of its perpendicular strength.

2. Steel saturation

*Thin metal sheet (e.g. computer case) severely 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

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.

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
Measurement Calculator
Force (pull)

Field Strength

Other proposals

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. 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 magnetic separators 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. 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. 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). The key parameter here is the holding force amounting to approximately 90.53 kg (force ~888.15 N), which, with such a flat shape, proves the high grade of the material. The product meets the standards for N38 grade magnets.

Strengths as well as weaknesses of rare earth magnets.

Benefits

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
  • Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external interference,
  • The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to look better,
  • Magnetic induction on the top side of the magnet turns out to be exceptional,
  • Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
  • Thanks to freedom in designing and the capacity to adapt to client solutions,
  • Significant place in innovative solutions – they are used in HDD drives, drive modules, medical devices, also industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Cons

Disadvantages of NdFeB magnets:
  • They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
  • Due to limitations in creating nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
  • Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Pull force analysis

Highest magnetic holding forcewhat contributes to it?

Information about lifting capacity was determined for ideal contact conditions, including:
  • using a sheet made of high-permeability steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with a surface free of scratches
  • without any insulating layer between the magnet and steel
  • under perpendicular force direction (90-degree angle)
  • at temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the working load may be lower depending on the following factors, starting with the most relevant:
  • Distance (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
  • Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
  • Plate texture – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
  • Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the load capacity.

Warnings
Dust explosion hazard

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.

Heat warning

Do not overheat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Magnet fragility

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

ICD Warning

For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.

Pinching danger

Large magnets can crush fingers instantly. Do not place your hand betwixt two strong magnets.

Magnetic media

Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and erase data from cards.

Choking Hazard

These products are not toys. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.

Handling rules

Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.

Allergy Warning

Some people experience a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause a rash. It is best to wear protective gloves.

GPS Danger

A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.

Danger! 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