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MPL 50x50x10 / N38 - lamellar magnet

lamellar magnet

Catalog no 020167

GTIN/EAN: 5906301811732

5.00

length

50 mm [±0,1 mm]

Width

50 mm [±0,1 mm]

Height

10 mm [±0,1 mm]

Weight

187.5 g

Magnetization Direction

↑ axial

Load capacity

33.73 kg / 330.92 N

Magnetic Induction

209.75 mT / 2097 Gs

Coating

[NiCuNi] Nickel

product parameters »

42.88 ZŁ with VAT / pcs + price for transport

34.86 ZŁ net + 23% VAT / pcs

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

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Detailed specification - MPL 50x50x10 / N38 - lamellar magnet

Specification / characteristics - MPL 50x50x10 / N38 - lamellar magnet

properties
properties values
Cat. no. 020167
GTIN/EAN 5906301811732
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 10 mm [±0,1 mm]
Weight 187.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 33.73 kg / 330.92 N
Magnetic Induction ~ ? 209.75 mT / 2097 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x50x10 / 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 magnet - report

The following data represent the direct effect of a mathematical calculation. Values rely on models for the material Nd2Fe14B. Operational parameters may differ. Please consider these data as a reference point for designers.

Table 1: Static pull force (pull vs gap) - characteristics
MPL 50x50x10 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 2097 Gs
209.7 mT
 33.73 kg / 74.36 lbs
33730.0 g / 330.9 N
 critical level
1 mm 2056 Gs
205.6 mT
 32.43 kg / 71.50 lbs
32430.0 g / 318.1 N
 critical level
2 mm 2009 Gs
200.9 mT
 30.96 kg / 68.27 lbs
30964.6 g / 303.8 N
 critical level
3 mm 1957 Gs
195.7 mT
 29.38 kg / 64.77 lbs
29380.4 g / 288.2 N
 critical level
5 mm 1841 Gs
184.1 mT
 25.99 kg / 57.30 lbs
25992.3 g / 255.0 N
 critical level
10 mm 1514 Gs
151.4 mT
 17.58 kg / 38.75 lbs
17577.6 g / 172.4 N
 critical level
15 mm 1194 Gs
119.4 mT
 10.93 kg / 24.10 lbs
10931.8 g / 107.2 N
 critical level
20 mm 922 Gs
92.2 mT
 6.51 kg / 14.36 lbs
6512.2 g / 63.9 N
 medium risk
30 mm 543 Gs
54.3 mT
 2.26 kg / 4.98 lbs
2260.0 g / 22.2 N
 medium risk
50 mm 209 Gs
20.9 mT
 0.33 kg / 0.74 lbs
334.1 g / 3.3 N
 safe
Grip strength decreases drastically with every mm of spacing. Remember that every additional insulation layer (e.g., dirt, paint, veneer) significantly reduces the pull force. Magnets work optimally at the point of direct contact; air break drastically cuts the force. Observe how rapidly the load capacity plummet, when the product does not adhere flatly to the steel surface. When designing the mounting, eliminate unnecessary gaps.

Table 2: Sliding force (vertical surface)
MPL 50x50x10 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 6.75 kg / 14.87 lbs
6746.0 g / 66.2 N
1 mm Stal (~0.2) 6.49 kg / 14.30 lbs
6486.0 g / 63.6 N
2 mm Stal (~0.2) 6.19 kg / 13.65 lbs
6192.0 g / 60.7 N
3 mm Stal (~0.2) 5.88 kg / 12.95 lbs
5876.0 g / 57.6 N
5 mm Stal (~0.2) 5.20 kg / 11.46 lbs
5198.0 g / 51.0 N
10 mm Stal (~0.2) 3.52 kg / 7.75 lbs
3516.0 g / 34.5 N
15 mm Stal (~0.2) 2.19 kg / 4.82 lbs
2186.0 g / 21.4 N
20 mm Stal (~0.2) 1.30 kg / 2.87 lbs
1302.0 g / 12.8 N
30 mm Stal (~0.2) 0.45 kg / 1.00 lbs
452.0 g / 4.4 N
50 mm Stal (~0.2) 0.07 kg / 0.15 lbs
66.0 g / 0.6 N
This section shows the estimated force sufficient to cause the downward movement of the magnet vertically along a upright metal surface (considering typical friction). This value is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x50x10 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
10.12 kg / 22.31 lbs
10119.0 g / 99.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
6.75 kg / 14.87 lbs
6746.0 g / 66.2 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.37 kg / 7.44 lbs
3373.0 g / 33.1 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
16.87 kg / 37.18 lbs
16865.0 g / 165.4 N
When mounting a element on a vertical surface (e.g., a board), it you can count on barely about 20%-30% of its nominal power. Gravity and a weak degree of grip mean that products slide down easier than they detach. Designing a wall mount? Consider that the shear force is noticeably lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a much lighter cargo. Using a rubber coating can significantly improve the result.

Table 4: Steel thickness (saturation) - power losses
MPL 50x50x10 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.69 kg / 3.72 lbs
1686.5 g / 16.5 N
1 mm
13%
 4.22 kg / 9.30 lbs
4216.3 g / 41.4 N
2 mm
25%
 8.43 kg / 18.59 lbs
8432.5 g / 82.7 N
3 mm
38%
 12.65 kg / 27.89 lbs
12648.8 g / 124.1 N
5 mm
63%
 21.08 kg / 46.48 lbs
21081.2 g / 206.8 N
10 mm
100%
 33.73 kg / 74.36 lbs
33730.0 g / 330.9 N
11 mm
100%
 33.73 kg / 74.36 lbs
33730.0 g / 330.9 N
12 mm
100%
 33.73 kg / 74.36 lbs
33730.0 g / 330.9 N
A thin sheet cannot absorb the entire magnetic field, which wastes potential of the holder. If you install a neodymium to a too thin substrate, the field will penetrate right through and the holding will be smaller. To squeeze the maximum of this neodymium's potential, you need a suitably thick backing of steel. The saturation phenomenon means that on sheet metal structures (e.g., car bodies), the holder shows lower pull force. We recommend selecting the steel thickness based on the following data.

Table 5: Thermal stability (stability) - power drop
MPL 50x50x10 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 33.73 kg / 74.36 lbs
33730.0 g / 330.9 N
 OK
40 °C -2.2% 32.99 kg / 72.73 lbs
32987.9 g / 323.6 N
 OK
60 °C -4.4% 32.25 kg / 71.09 lbs
32245.9 g / 316.3 N
80 °C -6.6% 31.50 kg / 69.45 lbs
31503.8 g / 309.1 N
100 °C -28.8% 24.02 kg / 52.95 lbs
24015.8 g / 235.6 N
Classic neodymiums lose strength past the thermal threshold. Avoid high temperatures – high temperature can irreversibly demagnetize this product. With increasing heat, the magnet's capacity briefly lowers. Avoid using this magnet near heat sources higher than its operating temperature limit. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Technical advisory: Heat tolerance is determined by both grade, but also on the magnet's shape. Low-profile magnets (low Pc) are more susceptible to demagnetization at lower temperatures than long magnets. Warning indicator in the table points to permanent field degradation for this specific geometry.

Table 6: Two magnets (attraction) - forces in the system
MPL 50x50x10 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 67.80 kg / 149.46 lbs
3 611 Gs
10.17 kg / 22.42 lbs
10169 g / 99.8 N
 N/A
1 mm 66.54 kg / 146.70 lbs
4 156 Gs
9.98 kg / 22.01 lbs
9982 g / 97.9 N
 59.89 kg / 132.03 lbs
~0 Gs
2 mm 65.18 kg / 143.70 lbs
4 113 Gs
9.78 kg / 21.56 lbs
9777 g / 95.9 N
 58.66 kg / 129.33 lbs
~0 Gs
3 mm 63.74 kg / 140.53 lbs
4 067 Gs
9.56 kg / 21.08 lbs
9562 g / 93.8 N
 57.37 kg / 126.48 lbs
~0 Gs
5 mm 60.67 kg / 133.75 lbs
3 968 Gs
9.10 kg / 20.06 lbs
9101 g / 89.3 N
 54.60 kg / 120.38 lbs
~0 Gs
10 mm 52.24 kg / 115.18 lbs
3 682 Gs
7.84 kg / 17.28 lbs
7836 g / 76.9 N
 47.02 kg / 103.66 lbs
~0 Gs
20 mm 35.33 kg / 77.89 lbs
3 028 Gs
5.30 kg / 11.68 lbs
5299 g / 52.0 N
 31.80 kg / 70.10 lbs
~0 Gs
50 mm 7.69 kg / 16.96 lbs
1 413 Gs
1.15 kg / 2.54 lbs
1154 g / 11.3 N
 6.92 kg / 15.26 lbs
~0 Gs
60 mm 4.54 kg / 10.01 lbs
1 086 Gs
0.68 kg / 1.50 lbs
681 g / 6.7 N
 4.09 kg / 9.01 lbs
~0 Gs
70 mm 2.72 kg / 6.01 lbs
841 Gs
0.41 kg / 0.90 lbs
409 g / 4.0 N
 2.45 kg / 5.41 lbs
~0 Gs
80 mm 1.67 kg / 3.68 lbs
658 Gs
0.25 kg / 0.55 lbs
250 g / 2.5 N
 1.50 kg / 3.31 lbs
~0 Gs
90 mm 1.05 kg / 2.31 lbs
521 Gs
0.16 kg / 0.35 lbs
157 g / 1.5 N
 0.94 kg / 2.08 lbs
~0 Gs
100 mm 0.67 kg / 1.48 lbs
417 Gs
0.10 kg / 0.22 lbs
101 g / 1.0 N
 0.60 kg / 1.33 lbs
~0 Gs
Two magnetic products attract each other from a much further distance than a neodymium and metal setup. The setup of two magnets generates a stronger field and a further horizon of operation. Designing a powerful holder? Apply two magnets instead of one magnet and a steel. Remember that when connecting a pair of magnets, the collision energy is massive. The repulsion force is a bit weaker than the attraction, but still large.
*Field value between like poles is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Attention: Estimates demonstrate sliding force of dual identical magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (implants) - warnings
MPL 50x50x10 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 21.0 cm
Hearing aid 10 Gs (1.0 mT) 16.5 cm
Timepiece 20 Gs (2.0 mT) 13.0 cm
Mobile device 40 Gs (4.0 mT) 10.0 cm
Car key 50 Gs (5.0 mT) 9.5 cm
Payment card 400 Gs (40.0 mT) 4.0 cm
HDD hard drive 600 Gs (60.0 mT) 3.0 cm
Extremely neodym field poses a real danger to electronics and medical implants. These neodymiums produce a field that destroys function of sensitive medical devices. Be aware: the unseen radiation penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. Influence will be felt by: mechanical watches, car keys, membranes, and screens. Avoid contact with magnetic cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (kinetic energy) - warning
MPL 50x50x10 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 17.38 km/h
(4.83 m/s)
 2.19 J
30 mm 24.39 km/h
(6.78 m/s)
 4.30 J
50 mm 30.43 km/h
(8.45 m/s)
 6.70 J
100 mm 42.78 km/h
(11.88 m/s)
 13.24 J
Magnetic elements are delicate – a collision with steel risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Kinetic force can trigger coating fragments or injury to fingers. Always hold the magnet during mounting so it doesn't hit with great force against the steel surface. A collision at high speed ends with a crack of the neodymium. Wear safety glasses when playing with powerful specimens.

Table 9: Corrosion resistance
MPL 50x50x10 / 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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Electrical data (Pc)
MPL 50x50x10 / N38

Parameter Value SI Unit / Description
Magnetic Flux 61 501 Mx 615.0 µWb
Pc Coefficient 0.26 Low (Flat)
Total magnetic flux passing through the magnet pole. Key data when building generators and motors. The Pc coefficient determines the working geometry.

Table 11: Physics of underwater searching
MPL 50x50x10 / N38

Environment Effective steel pull Effect
Air (land) 33.73 kg Standard
Water (riverbed) 38.62 kg
(+4.89 kg buoyancy gain)
+14.5%
Warning: Remember to wipe the magnet thoroughly after removing it from water and apply a protective layer (e.g., oil) to avoid corrosion.
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Vertical hold

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

2. Steel saturation

*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.

3. Power loss vs temp

*For N38 grade, the safety limit is 80°C.

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26

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
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: 020167-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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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 50x50x10 mm and a weight of 187.5 g, guarantees premium class connection. As a block magnet with high power (approx. 33.73 kg), this product is available off-the-shelf from our warehouse in Poland. The durable anti-corrosion layer ensures a long lifespan in a dry environment, protecting the core from oxidation.
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 33.73 kg can pinch very hard and cause hematomas. Using a screwdriver risks destroying the coating and permanently cracking the magnet.
Plate magnets MPL 50x50x10 / N38 are the foundation for many industrial devices, such as filters catching filings and linear motors. Thanks to the flat surface and high force (approx. 33.73 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.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. 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. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x50x10 mm, which, at a weight of 187.5 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 33.73 kg (force ~330.92 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Strengths and weaknesses of Nd2Fe14B magnets.

Pros

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • Their strength remains stable, and after around 10 years it decreases only by ~1% (according to research),
  • They feature excellent resistance to magnetic field loss when exposed to external fields,
  • In other words, due to the aesthetic surface of gold, the element gains visual value,
  • The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Possibility of precise machining and adjusting to concrete applications,
  • Universal use in modern technologies – they are commonly used in HDD drives, electric motors, medical equipment, and multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in small systems

Disadvantages

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • NdFeB magnets lose power 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 very resistant to heat
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
  • Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mechanism.
  • Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what affects it?

Magnet power was determined for the most favorable conditions, assuming:
  • using a base made of mild steel, functioning as a ideal flux conductor
  • whose thickness is min. 10 mm
  • characterized by lack of roughness
  • under conditions of no distance (surface-to-surface)
  • for force applied at a right angle (pull-off, not shear)
  • in neutral thermal conditions

Magnet lifting force in use – key factors

During everyday use, the real power depends on many variables, presented from crucial:
  • Space between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to detachment vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
  • Steel type – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
  • Base smoothness – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. Check the thermal limit for a given model.

Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the lifting capacity.

Safe handling of neodymium magnets
Pacemakers

Individuals with a ICD must keep an safe separation from magnets. The magnetic field can stop the functioning of the life-saving device.

No play value

NdFeB magnets are not toys. Eating several magnets may result in them pinching intestinal walls, which poses a direct threat to life and necessitates immediate surgery.

Crushing force

Mind your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!

Magnet fragility

NdFeB magnets are sintered ceramics, meaning they are very brittle. Impact of two magnets leads to them breaking into shards.

Conscious usage

Use magnets consciously. Their huge power can surprise even professionals. Be vigilant and do not underestimate their power.

Compass and GPS

A strong magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Maintain magnets near a smartphone to avoid breaking the sensors.

Mechanical processing

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

Data carriers

Device Safety: Strong magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Do not overheat magnets

Do not overheat. NdFeB magnets are sensitive to temperature. If you need resistance above 80°C, inquire about HT versions (H, SH, UH).

Allergic reactions

Certain individuals have a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling may cause skin redness. We recommend use protective gloves.

Attention! Details about hazards in the article: Safety of working with magnets.