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MPL 50x20x5 / N38 - lamellar magnet

lamellar magnet

Catalog no 020473

GTIN/EAN: 5906301811930

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

5 mm [±0,1 mm]

Weight

37.5 g

Magnetization Direction

↑ axial

Load capacity

12.69 kg / 124.48 N

Magnetic Induction

197.73 mT / 1977 Gs

Coating

[NiCuNi] Nickel

14.56 with VAT / pcs + price for transport

11.84 ZŁ net + 23% VAT / pcs

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Engineering report for this magnet

Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.

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Technical data - MPL 50x20x5 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet

properties
properties values
Cat. no. 020473
GTIN/EAN 5906301811930
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 20 mm [±0,1 mm]
Height 5 mm [±0,1 mm]
Weight 37.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 12.69 kg / 124.48 N
Magnetic Induction ~ ? 197.73 mT / 1977 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x5 / 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 analysis of the product - data

These data represent the outcome of a physical analysis. Values are based on models for the material Nd2Fe14B. Real-world performance might slightly differ. Please consider these data as a preliminary roadmap for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 50x20x5 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1977 Gs
197.7 mT
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
critical level
1 mm 1885 Gs
188.5 mT
11.53 kg / 25.42 lbs
11530.3 g / 113.1 N
critical level
2 mm 1772 Gs
177.2 mT
10.20 kg / 22.49 lbs
10199.9 g / 100.1 N
critical level
3 mm 1649 Gs
164.9 mT
8.83 kg / 19.47 lbs
8831.3 g / 86.6 N
medium risk
5 mm 1395 Gs
139.5 mT
6.32 kg / 13.93 lbs
6320.3 g / 62.0 N
medium risk
10 mm 870 Gs
87.0 mT
2.46 kg / 5.42 lbs
2459.4 g / 24.1 N
medium risk
15 mm 549 Gs
54.9 mT
0.98 kg / 2.15 lbs
976.9 g / 9.6 N
weak grip
20 mm 359 Gs
35.9 mT
0.42 kg / 0.92 lbs
418.9 g / 4.1 N
weak grip
30 mm 172 Gs
17.2 mT
0.10 kg / 0.21 lbs
95.7 g / 0.9 N
weak grip
50 mm 54 Gs
5.4 mT
0.01 kg / 0.02 lbs
9.5 g / 0.1 N
weak grip

Table 2: Shear capacity (vertical surface)
MPL 50x20x5 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
1 mm Stal (~0.2) 2.31 kg / 5.08 lbs
2306.0 g / 22.6 N
2 mm Stal (~0.2) 2.04 kg / 4.50 lbs
2040.0 g / 20.0 N
3 mm Stal (~0.2) 1.77 kg / 3.89 lbs
1766.0 g / 17.3 N
5 mm Stal (~0.2) 1.26 kg / 2.79 lbs
1264.0 g / 12.4 N
10 mm Stal (~0.2) 0.49 kg / 1.08 lbs
492.0 g / 4.8 N
15 mm Stal (~0.2) 0.20 kg / 0.43 lbs
196.0 g / 1.9 N
20 mm Stal (~0.2) 0.08 kg / 0.19 lbs
84.0 g / 0.8 N
30 mm Stal (~0.2) 0.02 kg / 0.04 lbs
20.0 g / 0.2 N
50 mm Stal (~0.2) 0.00 kg / 0.00 lbs
2.0 g / 0.0 N

Table 3: Wall mounting (sliding) - vertical pull
MPL 50x20x5 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
3.81 kg / 8.39 lbs
3807.0 g / 37.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
2.54 kg / 5.60 lbs
2538.0 g / 24.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
1.27 kg / 2.80 lbs
1269.0 g / 12.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
6.35 kg / 13.99 lbs
6345.0 g / 62.2 N

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x20x5 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
0.63 kg / 1.40 lbs
634.5 g / 6.2 N
1 mm
13%
1.59 kg / 3.50 lbs
1586.3 g / 15.6 N
2 mm
25%
3.17 kg / 6.99 lbs
3172.5 g / 31.1 N
3 mm
38%
4.76 kg / 10.49 lbs
4758.8 g / 46.7 N
5 mm
63%
7.93 kg / 17.49 lbs
7931.2 g / 77.8 N
10 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
11 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
12 mm
100%
12.69 kg / 27.98 lbs
12690.0 g / 124.5 N

Table 5: Thermal stability (stability) - resistance threshold
MPL 50x20x5 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 12.69 kg / 27.98 lbs
12690.0 g / 124.5 N
OK
40 °C -2.2% 12.41 kg / 27.36 lbs
12410.8 g / 121.8 N
OK
60 °C -4.4% 12.13 kg / 26.75 lbs
12131.6 g / 119.0 N
80 °C -6.6% 11.85 kg / 26.13 lbs
11852.5 g / 116.3 N
100 °C -28.8% 9.04 kg / 19.92 lbs
9035.3 g / 88.6 N

Table 6: Two magnets (attraction) - field collision
MPL 50x20x5 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 24.10 kg / 53.12 lbs
3 371 Gs
3.61 kg / 7.97 lbs
3614 g / 35.5 N
N/A
1 mm 23.06 kg / 50.84 lbs
3 868 Gs
3.46 kg / 7.63 lbs
3459 g / 33.9 N
20.75 kg / 45.75 lbs
~0 Gs
2 mm 21.89 kg / 48.27 lbs
3 769 Gs
3.28 kg / 7.24 lbs
3284 g / 32.2 N
19.71 kg / 43.44 lbs
~0 Gs
3 mm 20.65 kg / 45.53 lbs
3 661 Gs
3.10 kg / 6.83 lbs
3098 g / 30.4 N
18.59 kg / 40.98 lbs
~0 Gs
5 mm 18.07 kg / 39.83 lbs
3 424 Gs
2.71 kg / 5.97 lbs
2710 g / 26.6 N
16.26 kg / 35.84 lbs
~0 Gs
10 mm 12.00 kg / 26.46 lbs
2 790 Gs
1.80 kg / 3.97 lbs
1800 g / 17.7 N
10.80 kg / 23.81 lbs
~0 Gs
20 mm 4.67 kg / 10.30 lbs
1 741 Gs
0.70 kg / 1.54 lbs
701 g / 6.9 N
4.20 kg / 9.27 lbs
~0 Gs
50 mm 0.37 kg / 0.81 lbs
488 Gs
0.06 kg / 0.12 lbs
55 g / 0.5 N
0.33 kg / 0.73 lbs
~0 Gs
60 mm 0.18 kg / 0.40 lbs
343 Gs
0.03 kg / 0.06 lbs
27 g / 0.3 N
0.16 kg / 0.36 lbs
~0 Gs
70 mm 0.10 kg / 0.21 lbs
248 Gs
0.01 kg / 0.03 lbs
14 g / 0.1 N
0.09 kg / 0.19 lbs
~0 Gs
80 mm 0.05 kg / 0.12 lbs
184 Gs
0.01 kg / 0.02 lbs
8 g / 0.1 N
0.05 kg / 0.10 lbs
~0 Gs
90 mm 0.03 kg / 0.07 lbs
140 Gs
0.00 kg / 0.01 lbs
5 g / 0.0 N
0.03 kg / 0.06 lbs
~0 Gs
100 mm 0.02 kg / 0.04 lbs
108 Gs
0.00 kg / 0.01 lbs
3 g / 0.0 N
0.02 kg / 0.04 lbs
~0 Gs

Table 7: Safety (HSE) (implants) - warnings
MPL 50x20x5 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 12.5 cm
Hearing aid 10 Gs (1.0 mT) 9.5 cm
Timepiece 20 Gs (2.0 mT) 7.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.0 cm
Car key 50 Gs (5.0 mT) 5.5 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm

Table 8: Dynamics (cracking risk) - warning
MPL 50x20x5 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 21.52 km/h
(5.98 m/s)
0.67 J
30 mm 23.53 km/h
(6.54 m/s)
0.80 J
50 mm 23.63 km/h
(6.56 m/s)
0.81 J
100 mm 23.65 km/h
(6.57 m/s)
0.81 J

Table 9: Surface protection spec
MPL 50x20x5 / 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 50x20x5 / N38

Parameter Value SI Unit / Description
Magnetic Flux 20 792 Mx 207.9 µWb
Pc Coefficient 0.21 Low (Flat)

Table 11: Hydrostatics and buoyancy
MPL 50x20x5 / N38

Environment Effective steel pull Effect
Air (land) 12.69 kg Standard
Water (riverbed) 14.53 kg
(+1.84 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

*Note: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.

2. Plate thickness effect

*Thin steel (e.g. computer 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) = 0.21

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%
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: 020473-2026
Magnet Unit Converter
Force (pull)

Magnetic Induction

Check out also offers

This product is an extremely strong plate magnet made of NdFeB material, which, with dimensions of 50x20x5 mm and a weight of 37.5 g, guarantees premium class connection. As a block magnet with high power (approx. 12.69 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.
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 12.69 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.
They constitute a key element in the production of wind generators and material handling systems. 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 50x20x5 / N38, it is best to use strong epoxy glues (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 50x20x5 / N38 model is magnetized through the thickness (dimension 5 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. Such a pole arrangement ensures maximum holding capacity when pressing against the sheet, creating a closed magnetic circuit.
This model is characterized by dimensions 50x20x5 mm, which, at a weight of 37.5 g, makes it an element with impressive energy density. It is a magnetic block with dimensions 50x20x5 mm and a self-weight of 37.5 g, ready to work at temperatures up to 80°C. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Strengths

In addition to their pulling strength, neodymium magnets provide the following advantages:
  • They have stable power, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
  • They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
  • By applying a decorative layer of silver, the element gains an professional look,
  • Magnetic induction on the working part of the magnet remains exceptional,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
  • Possibility of exact shaping as well as modifying to specific conditions,
  • Huge importance in electronics industry – they are commonly used in hard drives, electric motors, precision medical tools, as well as industrial machines.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in miniature devices

Cons

Characteristics of disadvantages of neodymium magnets and proposals for their use:
  • To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding 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, when using outdoors
  • We suggest cover - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated shapes.
  • Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which gains importance in the context of child health protection. It is also worth noting that small components of these products can complicate diagnosis medical when they are in the body.
  • High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Lifting parameters

Magnetic strength at its maximum – what it depends on?

Magnet power was determined for ideal contact conditions, including:
  • with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
  • whose thickness equals approx. 10 mm
  • with a plane free of scratches
  • under conditions of ideal adhesion (metal-to-metal)
  • under perpendicular force vector (90-degree angle)
  • in stable room temperature

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity results from many variables, ranked from crucial:
  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
  • Steel grade – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the holding force.

Warnings
Threat to navigation

Navigation devices and smartphones are extremely susceptible to magnetism. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.

Choking Hazard

Product intended for adults. Small elements can be swallowed, causing serious injuries. Store out of reach of kids and pets.

Avoid contact if allergic

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness occurs, immediately stop handling magnets and wear gloves.

Safe operation

Use magnets consciously. Their powerful strength can shock even professionals. Stay alert and respect their force.

Electronic hazard

Data protection: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).

Pinching danger

Mind your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Material brittleness

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Pacemakers

Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Heat warning

Keep cool. NdFeB magnets are sensitive to temperature. If you require operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Machining danger

Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Caution! Looking for details? Read our article: Are neodymium magnets dangerous?