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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

technical specifications »

159.90 ZŁ with VAT / pcs + price for transport

130.00 ZŁ net + 23% VAT / pcs

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Technical specification 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

Engineering modeling of the assembly - report

Presented information are the direct effect of a mathematical analysis. Results rely on models for the class Nd2Fe14B. Actual conditions may deviate from the simulation results. Use these calculations as a reference point when designing systems.

Table 1: Static force (pull vs gap) - interaction chart
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 pounds
90530.0 g / 888.1 N
 crushing
1 mm 3999 Gs
399.9 mT
 84.79 kg / 186.94 pounds
84794.0 g / 831.8 N
 crushing
2 mm 3861 Gs
386.1 mT
 79.04 kg / 174.25 pounds
79038.6 g / 775.4 N
 crushing
3 mm 3720 Gs
372.0 mT
 73.38 kg / 161.78 pounds
73381.8 g / 719.9 N
 crushing
5 mm 3435 Gs
343.5 mT
 62.56 kg / 137.93 pounds
62564.2 g / 613.8 N
 crushing
10 mm 2742 Gs
274.2 mT
 39.87 kg / 87.90 pounds
39868.7 g / 391.1 N
 crushing
15 mm 2137 Gs
213.7 mT
 24.21 kg / 53.37 pounds
24210.4 g / 237.5 N
 crushing
20 mm 1649 Gs
164.9 mT
 14.41 kg / 31.77 pounds
14409.9 g / 141.4 N
 crushing
30 mm 988 Gs
98.8 mT
 5.17 kg / 11.40 pounds
5170.9 g / 50.7 N
 warning
50 mm 399 Gs
39.9 mT
 0.85 kg / 1.86 pounds
845.8 g / 8.3 N
 weak grip
Magnetic force weakens sharply per each millimeter of gap. Keep in mind that even a microscopic distance (e.g., contamination, paint, veneer) noticeably weakens the grip. Neodymiums work strongest in perfect adhesion; distance kills the force. Observe how quickly the pull force fall, when the magnet does not touch flatly to the metal substrate. When calculating the assembly, discard redundant distances.

Table 2: Slippage hold (wall)
MPL 50x50x25 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
1 mm Stal (~0.2) 16.96 kg / 37.39 pounds
16958.0 g / 166.4 N
2 mm Stal (~0.2) 15.81 kg / 34.85 pounds
15808.0 g / 155.1 N
3 mm Stal (~0.2) 14.68 kg / 32.36 pounds
14676.0 g / 144.0 N
5 mm Stal (~0.2) 12.51 kg / 27.58 pounds
12512.0 g / 122.7 N
10 mm Stal (~0.2) 7.97 kg / 17.58 pounds
7974.0 g / 78.2 N
15 mm Stal (~0.2) 4.84 kg / 10.67 pounds
4842.0 g / 47.5 N
20 mm Stal (~0.2) 2.88 kg / 6.35 pounds
2882.0 g / 28.3 N
30 mm Stal (~0.2) 1.03 kg / 2.28 pounds
1034.0 g / 10.1 N
50 mm Stal (~0.2) 0.17 kg / 0.37 pounds
170.0 g / 1.7 N
This section shows the approximate shear load necessary to initiate the slippage of the magnet downwards along a vertical steel wall (assuming standard friction coefficient). This value varies with the distance between the magnet and the surface.

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 pounds
27159.0 g / 266.4 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
9.05 kg / 19.96 pounds
9053.0 g / 88.8 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
45.27 kg / 99.79 pounds
45265.0 g / 444.0 N
When hanging a element on a vertical surface (e.g., a fridge), it will only hold only about 20%-30% of its maximum pull force. Gravitational force as well as a low friction coefficient mean that products move down easier than they detach. Designing a hanger? Remember that the shear force is significantly lower than the maximum static pull force. On a smooth steel, the element will give way down under a significantly smaller load. Using a rubber pad can effectively improve the result.

Table 4: Steel thickness (saturation) - 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 pounds
3017.7 g / 29.6 N
1 mm
8%
 7.54 kg / 16.63 pounds
7544.2 g / 74.0 N
2 mm
17%
 15.09 kg / 33.26 pounds
15088.3 g / 148.0 N
3 mm
25%
 22.63 kg / 49.90 pounds
22632.5 g / 222.0 N
5 mm
42%
 37.72 kg / 83.16 pounds
37720.8 g / 370.0 N
10 mm
83%
 75.44 kg / 166.32 pounds
75441.7 g / 740.1 N
11 mm
92%
 82.99 kg / 182.95 pounds
82985.8 g / 814.1 N
12 mm
100%
 90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
A thin metal plate is unable to take in the entire magnetic field, which weakens actual performance of the holder. If you mount a strong magnet to a too thin substrate, the field will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's potential, you need a suitably thick element of steel. The saturation phenomenon means that on delicate walls (e.g., thin profiles), the magnet shows lower pull force. We suggest choosing the steel cross-section according to the table below.

Table 5: Working in heat (stability) - thermal limit
MPL 50x50x25 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
 OK
40 °C -2.2% 88.54 kg / 195.19 pounds
88538.3 g / 868.6 N
 OK
60 °C -4.4% 86.55 kg / 190.80 pounds
86546.7 g / 849.0 N
80 °C -6.6% 84.56 kg / 186.41 pounds
84555.0 g / 829.5 N
100 °C -28.8% 64.46 kg / 142.10 pounds
64457.4 g / 632.3 N
Standard neodymium magnets change their properties strength above the temperature limit. Avoid high temperatures – excessive heat can permanently damage this product. With increasing heat, the magnet's power temporarily decreases. Refrain from using this magnet near heat sources higher than its operating temperature limit. Exceeding the critical threshold will cause irreversible degradation of magnetism.
*Technical advisory: Temperature resistance is determined by both grade, and the Permeance Coefficient Pc. Flat magnets (low Pc) may lose charge permanently under lower heat stress than long magnets. Red status in the table points to permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 50x50x25 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Sliding Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 263.15 kg / 580.14 pounds
5 403 Gs
39.47 kg / 87.02 pounds
39472 g / 387.2 N
 N/A
1 mm 254.89 kg / 561.94 pounds
8 133 Gs
38.23 kg / 84.29 pounds
38234 g / 375.1 N
 229.40 kg / 505.75 pounds
~0 Gs
2 mm 246.47 kg / 543.38 pounds
7 998 Gs
36.97 kg / 81.51 pounds
36971 g / 362.7 N
 221.83 kg / 489.04 pounds
~0 Gs
3 mm 238.08 kg / 524.88 pounds
7 861 Gs
35.71 kg / 78.73 pounds
35713 g / 350.3 N
 214.28 kg / 472.40 pounds
~0 Gs
5 mm 221.48 kg / 488.27 pounds
7 582 Gs
33.22 kg / 73.24 pounds
33222 g / 325.9 N
 199.33 kg / 439.45 pounds
~0 Gs
10 mm 181.86 kg / 400.93 pounds
6 870 Gs
27.28 kg / 60.14 pounds
27279 g / 267.6 N
 163.67 kg / 360.83 pounds
~0 Gs
20 mm 115.89 kg / 255.49 pounds
5 484 Gs
17.38 kg / 38.32 pounds
17383 g / 170.5 N
 104.30 kg / 229.94 pounds
~0 Gs
50 mm 24.93 kg / 54.97 pounds
2 544 Gs
3.74 kg / 8.25 pounds
3740 g / 36.7 N
 22.44 kg / 49.47 pounds
~0 Gs
60 mm 15.03 kg / 33.14 pounds
1 975 Gs
2.25 kg / 4.97 pounds
2255 g / 22.1 N
 13.53 kg / 29.82 pounds
~0 Gs
70 mm 9.24 kg / 20.37 pounds
1 548 Gs
1.39 kg / 3.05 pounds
1386 g / 13.6 N
 8.31 kg / 18.33 pounds
~0 Gs
80 mm 5.81 kg / 12.80 pounds
1 228 Gs
0.87 kg / 1.92 pounds
871 g / 8.5 N
 5.23 kg / 11.52 pounds
~0 Gs
90 mm 3.74 kg / 8.24 pounds
985 Gs
0.56 kg / 1.24 pounds
560 g / 5.5 N
 3.36 kg / 7.41 pounds
~0 Gs
100 mm 2.46 kg / 5.42 pounds
799 Gs
0.37 kg / 0.81 pounds
369 g / 3.6 N
 2.21 kg / 4.88 pounds
~0 Gs
Two magnets attract each other from a wider radius than a magnet and steel setup. The setup of two magnets creates a more powerful interaction and a further horizon of operation. Planning to create a strong closure? Utilize two neodymiums instead of a neodymium and a steel. Be careful that when bringing together two magnets, the collision energy is huge. The repulsion force is a bit weaker than the connection force, but still large.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center of the gap (caused by magnetic field nullification).
Important: Estimates apply to friction force of a pair of identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Protective zones (electronics) - 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
A strong magnetic field poses a large risk to electronic devices as well as medical implants. These magnets produce a flux that prevents correct functioning of digital equipment. Remember: the unseen radiation penetrates the body and plastic. Exceptional care must be taken by people with hearing aids and insulin pumps. The risk also applies to: mechanical watches, remotes, speakers, and screens. Do not bring the product near payment cards, HDD media, or sensitive navigation tools.

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
Neodymium magnets are delicate – a violent impact against metal can result in shattering. Watch the impact speed – a magnet released freely turns into a projectile. Striking energy can trigger coating fragments or injury to skin. Be sure to control the product during bringing near metal so it doesn't hit with great force against the metal. A contact at a velocity of dozens of km/h ends with a crack of the neodymium. Wear eye protection when working with large magnets.

Table 9: Coating parameters (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)
Neodymium magnets are highly susceptible to corrosion without proper protection. Moisture resistance is crucial for installations in bathrooms or outdoors.

Table 10: Construction data (Flux)
MPL 50x50x25 / N38

Parameter Value SI Unit / Description
Magnetic Flux 105 093 Mx 1050.9 µWb
Pc Coefficient 0.54 Low (Flat)
Flux value passing through the magnet pole. Key data in coil applications as well as sensors. The Pc coefficient determines the magnet's operating point.

Table 11: Submerged application
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%
Corrosion 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. Note: for permanent underwater work, we recommend magnets with an anti-corrosive (epoxy) coating.
1. Vertical hold

*Note: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.

2. Steel saturation

*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.

3. Heat tolerance

*For standard magnets, the safety limit 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
Chemical composition
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%
Ecology and recycling (GPSR)
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
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Model MPL 50x50x25 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. This rectangular 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.
Separating strong flat magnets requires a technique based on sliding (moving one relative to the other), rather than forceful pulling apart. To separate the MPL 50x50x25 / 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. 90.53 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. Customers often choose this model for hanging tools 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. Remember to roughen and wash 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. In practice, this means that this magnet has the greatest attraction force on its main planes (50x50 mm), which is ideal for flat mounting. This is the most popular configuration for block magnets used in separators and holders.
This model is characterized by dimensions 50x50x25 mm, which, at a weight of 468.75 g, makes it an element with impressive energy density. 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 protective [NiCuNi] coating secures the magnet against corrosion.

Advantages as well as disadvantages of rare earth magnets.

Advantages

Apart from their superior magnetic energy, neodymium magnets have these key benefits:
  • They have constant strength, and over more than 10 years their performance decreases symbolically – ~1% (according to theory),
  • They show high resistance to demagnetization induced by presence of other magnetic fields,
  • The use of an refined layer of noble metals (nickel, gold, silver) causes the element to present itself better,
  • Magnetic induction on the top side of the magnet is exceptional,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
  • Thanks to flexibility in shaping and the capacity to adapt to unusual requirements,
  • Significant place in future technologies – they are utilized in HDD drives, motor assemblies, advanced medical instruments, as well as multitasking production systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons

Disadvantages of NdFeB magnets:
  • Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also increases their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 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 stable to moisture, when using outdoors
  • Due to limitations in realizing nuts and complex shapes in magnets, we recommend using cover - magnetic mount.
  • Health risk to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child safety. Furthermore, small components of these magnets can disrupt the diagnostic process medical in case of swallowing.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Holding force characteristics

Best holding force of the magnet in ideal parameters – what it depends on?

Magnet power was defined for the most favorable conditions, taking into account:
  • on a base made of mild steel, perfectly concentrating the magnetic field
  • possessing a massiveness of minimum 10 mm to ensure full flux closure
  • characterized by smoothness
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction vertical to the plane
  • in stable room temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding may be lower subject to the following factors, in order of importance:
  • Distance (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
  • Base massiveness – too thin sheet causes magnetic saturation, causing part of the flux to be escaped into the air.
  • Steel type – low-carbon steel attracts best. Alloy admixtures reduce magnetic permeability and holding force.
  • Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature weakens magnetic field. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap between the magnet and the plate lowers the holding force.

Warnings
Safe distance

Data protection: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).

Shattering risk

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.

Physical harm

Pinching hazard: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Use thick gloves.

Powerful field

Exercise caution. Neodymium magnets attract from a long distance and snap with huge force, often quicker than you can react.

Product not for children

Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.

GPS and phone interference

Note: rare earth magnets generate a field that disrupts sensitive sensors. Keep a separation from your phone, tablet, and navigation systems.

Medical interference

For implant holders: Powerful magnets affect electronics. Maintain minimum 30 cm distance or request help to handle the magnets.

Dust is flammable

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Metal Allergy

Some people suffer from a sensitization to Ni, which is the standard coating for neodymium magnets. Prolonged contact can result in dermatitis. We strongly advise use safety gloves.

Power loss in heat

Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.

Security! More info about risks in the article: Safety of working with magnets.