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MPL 50x20x20 / N38 - lamellar magnet

lamellar magnet

Catalog no 020166

GTIN/EAN: 5906301811725

5.00

length

50 mm [±0,1 mm]

Width

20 mm [±0,1 mm]

Height

20 mm [±0,1 mm]

Weight

150 g

Magnetization Direction

↑ axial

Load capacity

42.18 kg / 413.81 N

Magnetic Induction

478.99 mT / 4790 Gs

Coating

[NiCuNi] Nickel

check specifications »

47.32 ZŁ with VAT / pcs + price for transport

38.47 ZŁ net + 23% VAT / pcs

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Force along with appearance of a neodymium magnet can be analyzed on our modular calculator.

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Product card - MPL 50x20x20 / N38 - lamellar magnet

Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet

properties
properties values
Cat. no. 020166
GTIN/EAN 5906301811725
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 20 mm [±0,1 mm]
Weight 150 g
Magnetization Direction ↑ axial
Load capacity ~ ? 42.18 kg / 413.81 N
Magnetic Induction ~ ? 478.99 mT / 4790 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x20x20 / 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 values are the direct effect of a engineering analysis. Values were calculated on algorithms for the class Nd2Fe14B. Operational parameters might slightly differ. Treat these data as a reference point during assembly planning.

Table 1: Static pull force (pull vs gap) - power drop
MPL 50x20x20 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 4789 Gs
478.9 mT
 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
 dangerous!
1 mm 4452 Gs
445.2 mT
 36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
 dangerous!
2 mm 4114 Gs
411.4 mT
 31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
 dangerous!
3 mm 3784 Gs
378.4 mT
 26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
 dangerous!
5 mm 3173 Gs
317.3 mT
 18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
 dangerous!
10 mm 2022 Gs
202.2 mT
 7.52 kg / 16.59 pounds
7522.9 g / 73.8 N
 medium risk
15 mm 1324 Gs
132.4 mT
 3.22 kg / 7.10 pounds
3222.6 g / 31.6 N
 medium risk
20 mm 899 Gs
89.9 mT
 1.49 kg / 3.28 pounds
1487.5 g / 14.6 N
 safe
30 mm 458 Gs
45.8 mT
 0.39 kg / 0.85 pounds
385.8 g / 3.8 N
 safe
50 mm 159 Gs
15.9 mT
 0.05 kg / 0.10 pounds
46.4 g / 0.5 N
 safe
Magnetic force decreases sharply per each millimeter of gap. Note that even the smallest gap (e.g., contamination, paint, rust) noticeably reduces the pull force. Magnets operate optimally in perfect adhesion; distance nullifies the power. Notice how quickly the load capacity fall, when the magnet does not touch tightly to the steel surface. When planning the arrangement, eliminate unnecessary gaps.

Table 2: Slippage hold (vertical surface)
MPL 50x20x20 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
1 mm Stal (~0.2) 7.29 kg / 16.08 pounds
7292.0 g / 71.5 N
2 mm Stal (~0.2) 6.23 kg / 13.73 pounds
6226.0 g / 61.1 N
3 mm Stal (~0.2) 5.27 kg / 11.61 pounds
5268.0 g / 51.7 N
5 mm Stal (~0.2) 3.70 kg / 8.17 pounds
3704.0 g / 36.3 N
10 mm Stal (~0.2) 1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
15 mm Stal (~0.2) 0.64 kg / 1.42 pounds
644.0 g / 6.3 N
20 mm Stal (~0.2) 0.30 kg / 0.66 pounds
298.0 g / 2.9 N
30 mm Stal (~0.2) 0.08 kg / 0.17 pounds
78.0 g / 0.8 N
50 mm Stal (~0.2) 0.01 kg / 0.02 pounds
10.0 g / 0.1 N
The following data indicates the approximate holding capacity needed to initiate the sliding of the magnet downwards along a vertical steel wall (assuming standard friction). This parameter is a function of the gap size between the magnet and the metal.

Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x20x20 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
12.65 kg / 27.90 pounds
12654.0 g / 124.1 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
4.22 kg / 9.30 pounds
4218.0 g / 41.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
21.09 kg / 46.50 pounds
21090.0 g / 206.9 N
When placing a element on a upright plane (e.g., a board), it will maintain just about 20%-30% of its nominal power. Gravity as well as a weak degree of grip mean that magnets move down easier than they pop off the substrate. Planning a wall mount? Remember that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the element will give way down under a much lighter weight. Using a rubber pad can effectively raise the stability.

Table 4: Steel thickness (saturation) - sheet metal selection
MPL 50x20x20 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 2.11 kg / 4.65 pounds
2109.0 g / 20.7 N
1 mm
13%
 5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
2 mm
25%
 10.55 kg / 23.25 pounds
10545.0 g / 103.4 N
3 mm
38%
 15.82 kg / 34.87 pounds
15817.5 g / 155.2 N
5 mm
63%
 26.36 kg / 58.12 pounds
26362.5 g / 258.6 N
10 mm
100%
 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
11 mm
100%
 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
12 mm
100%
 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
A thin sheet is not enough to conduct the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a too thin substrate, the magnetism will pass right through and the holding will be smaller. To squeeze the maximum of this magnet's potential, you need a suitably thick element of steel. The material oversaturation causes that on thin elements (e.g., thin profiles), the product shows lower pull force. We advise picking the steel thickness from these parameters.

Table 5: Working in heat (stability) - resistance threshold
MPL 50x20x20 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
 OK
40 °C -2.2% 41.25 kg / 90.95 pounds
41252.0 g / 404.7 N
 OK
60 °C -4.4% 40.32 kg / 88.90 pounds
40324.1 g / 395.6 N
 OK
80 °C -6.6% 39.40 kg / 86.85 pounds
39396.1 g / 386.5 N
100 °C -28.8% 30.03 kg / 66.21 pounds
30032.2 g / 294.6 N
Ordinary NdFeB products change their properties strength after exceeding the maximum temperature. Protect against heat – high temperature can irreversibly destroy this magnet. With every degree above norm, the magnet's capacity briefly lowers. Avoid using this magnet near heat sources higher than its working range. Exceeding the critical threshold will result in permanent loss of magnetism.
*Important note: Thermal stability depends not only on the material grade, and the Permeance Coefficient Pc. Thin magnets (low permeance coefficient) may lose charge permanently sooner than taller cylinders. Warning indicator in the table points to permanent field degradation for this particular item.

Table 6: Two magnets (attraction) - forces in the system
MPL 50x20x20 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 141.37 kg / 311.66 pounds
5 687 Gs
21.21 kg / 46.75 pounds
21205 g / 208.0 N
 N/A
1 mm 131.73 kg / 290.41 pounds
9 245 Gs
19.76 kg / 43.56 pounds
19759 g / 193.8 N
 118.55 kg / 261.37 pounds
~0 Gs
2 mm 122.20 kg / 269.41 pounds
8 904 Gs
18.33 kg / 40.41 pounds
18330 g / 179.8 N
 109.98 kg / 242.47 pounds
~0 Gs
3 mm 113.05 kg / 249.23 pounds
8 564 Gs
16.96 kg / 37.38 pounds
16957 g / 166.4 N
 101.74 kg / 224.31 pounds
~0 Gs
5 mm 96.05 kg / 211.76 pounds
7 894 Gs
14.41 kg / 31.76 pounds
14408 g / 141.3 N
 86.45 kg / 190.58 pounds
~0 Gs
10 mm 62.08 kg / 136.87 pounds
6 347 Gs
9.31 kg / 20.53 pounds
9312 g / 91.4 N
 55.87 kg / 123.18 pounds
~0 Gs
20 mm 25.21 kg / 55.59 pounds
4 045 Gs
3.78 kg / 8.34 pounds
3782 g / 37.1 N
 22.69 kg / 50.03 pounds
~0 Gs
50 mm 2.46 kg / 5.43 pounds
1 264 Gs
0.37 kg / 0.81 pounds
370 g / 3.6 N
 2.22 kg / 4.89 pounds
~0 Gs
60 mm 1.29 kg / 2.85 pounds
916 Gs
0.19 kg / 0.43 pounds
194 g / 1.9 N
 1.16 kg / 2.57 pounds
~0 Gs
70 mm 0.71 kg / 1.58 pounds
681 Gs
0.11 kg / 0.24 pounds
107 g / 1.1 N
 0.64 kg / 1.42 pounds
~0 Gs
80 mm 0.41 kg / 0.91 pounds
518 Gs
0.06 kg / 0.14 pounds
62 g / 0.6 N
 0.37 kg / 0.82 pounds
~0 Gs
90 mm 0.25 kg / 0.55 pounds
402 Gs
0.04 kg / 0.08 pounds
37 g / 0.4 N
 0.22 kg / 0.49 pounds
~0 Gs
100 mm 0.16 kg / 0.34 pounds
318 Gs
0.02 kg / 0.05 pounds
23 g / 0.2 N
 0.14 kg / 0.31 pounds
~0 Gs
Two strong neodymiums attract each other from a much further distance than a magnet and sheet combination. Such a system of magnet-to-magnet produces a massive flux and a larger range of performance. Planning to create a powerful holder? Apply two magnets instead of a neodymium and a striker plate. Be careful that when bringing together two magnets, the impact force is huge. The repulsion force is marginally weaker than the connection force, but still impressive.
*Field value between like poles is approximately ~0 Gs in the exact middle of the gap (due to field cancellation).
Important: Calculations refer to shear force of two identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni coating).

Table 7: Hazards (implants) - precautionary measures
MPL 50x20x20 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 19.0 cm
Hearing aid 10 Gs (1.0 mT) 15.0 cm
Timepiece 20 Gs (2.0 mT) 11.5 cm
Phone / Smartphone 40 Gs (4.0 mT) 9.0 cm
Remote 50 Gs (5.0 mT) 8.5 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field is a real danger to electronic devices as well as medical implants. These magnets produce a flux that destroys function of digital equipment. Notice: the unseen radiation passes through tissues and plastic. Exceptional care must be exercised by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, membranes, and displays. Avoid contact with magnetic cards, HDD media, or precise measuring instruments.

Table 8: Collisions (cracking risk) - warning
MPL 50x20x20 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 18.70 km/h
(5.20 m/s)
 2.02 J
30 mm 29.46 km/h
(8.18 m/s)
 5.02 J
50 mm 37.84 km/h
(10.51 m/s)
 8.29 J
100 mm 53.48 km/h
(14.86 m/s)
 16.55 J
Neodymium magnets are delicate – a collision with steel can result in shattering. Watch the impact speed – a neodymium left loose becomes dangerous. Kinetic force can destroy the magnet or injury to fingers. Always hold the magnet during installation so it doesn't slam with momentum against the steel surface. A contact at a velocity of dozens of km/h means shattering of the magnet. Wear safety glasses when working with powerful specimens.

Table 9: Coating parameters (durability)
MPL 50x20x20 / 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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 50x20x20 / N38

Parameter Value SI Unit / Description
Magnetic Flux 46 654 Mx 466.5 µWb
Pc Coefficient 0.63 High (Stable)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. Pc value defines the magnet's operating point.

Table 11: Physics of underwater searching
MPL 50x20x20 / N38

Environment Effective steel pull Effect
Air (land) 42.18 kg Standard
Water (riverbed) 48.30 kg
(+6.12 kg buoyancy gain)
+14.5%
Warning: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Warning: On a vertical surface, the magnet retains only ~20% of its max power.

2. Efficiency vs thickness

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

3. Temperature resistance

*For N38 material, the critical limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63

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 specification and ecology
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: 020166-2026
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x20x20 mm and a weight of 150 g, guarantees premium class connection. This magnetic block with a force of 413.81 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. To separate the MPL 50x20x20 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend extreme caution, 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.
They constitute a key element in the production of wind generators and material handling systems. Thanks to the flat surface and high force (approx. 42.18 kg), they are ideal as closers 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 50x20x20 / N38, we recommend utilizing 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 clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
The magnetic axis runs through the shortest dimension, which is typical for gripper magnets. 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 20 mm (width), and 20 mm (thickness). The key parameter here is the holding force amounting to approximately 42.18 kg (force ~413.81 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.

Strengths

In addition to their long-term stability, neodymium magnets provide the following advantages:
  • They have unchanged lifting capacity, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
  • They are extremely resistant to demagnetization induced by presence of other magnetic fields,
  • Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
  • Possibility of exact machining as well as adjusting to specific conditions,
  • Key role in modern industrial fields – they are used in mass storage devices, brushless drives, medical devices, and multitasking production systems.
  • Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
  • Due to limitations in creating nuts and complicated forms in magnets, we propose using casing - magnetic holder.
  • Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these products are able to complicate diagnosis medical after entering the body.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

The specified lifting capacity refers to the limit force, recorded under optimal environment, specifically:
  • on a block made of mild steel, optimally conducting the magnetic flux
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • with an ideally smooth contact surface
  • with zero gap (without paint)
  • under axial force vector (90-degree angle)
  • at temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Please note that the magnet holding will differ subject to elements below, in order of importance:
  • Clearance – the presence of any layer (paint, dirt, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
  • Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
  • Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Base smoothness – the more even the plate, the larger the contact zone and stronger the hold. Roughness acts like micro-gaps.
  • Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost they can be stronger (up to a certain limit).

Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets
Metal Allergy

It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If your skin reacts to metals, avoid touching magnets with bare hands and select versions in plastic housing.

Protective goggles

Watch out for shards. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Immense force

Be careful. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

Impact on smartphones

GPS units and smartphones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Hand protection

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

Power loss in heat

Keep cool. Neodymium magnets are susceptible to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

ICD Warning

For implant holders: Strong magnetic fields affect medical devices. Keep minimum 30 cm distance or request help to handle the magnets.

Choking Hazard

Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store out of reach of children and animals.

Mechanical processing

Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

Magnetic media

Do not bring magnets near a wallet, computer, or TV. The magnetic field can destroy these devices and wipe information from cards.

Security! Looking for details? Read our article: Why are neodymium magnets dangerous?