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MPL 50x30x4 / N38 - lamellar magnet

lamellar magnet

Catalog no 020497

GTIN/EAN: 5906301814955

length

50 mm [±0,1 mm]

Width

30 mm [±0,1 mm]

Height

4 mm [±0,1 mm]

Weight

45 g

Magnetization Direction

↑ axial

Load capacity

7.57 kg / 74.26 N

Magnetic Induction

120.04 mT / 1200 Gs

Coating

[NiCuNi] Nickel

see properties »

25.83 ZŁ with VAT / pcs + price for transport

21.00 ZŁ net + 23% VAT / pcs

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Detailed specification - MPL 50x30x4 / N38 - lamellar magnet

Specification / characteristics - MPL 50x30x4 / N38 - lamellar magnet

properties
properties values
Cat. no. 020497
GTIN/EAN 5906301814955
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 30 mm [±0,1 mm]
Height 4 mm [±0,1 mm]
Weight 45 g
Magnetization Direction ↑ axial
Load capacity ~ ? 7.57 kg / 74.26 N
Magnetic Induction ~ ? 120.04 mT / 1200 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x30x4 / 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 assembly - technical parameters

The following values constitute the result of a physical simulation. Results are based on models for the class Nd2Fe14B. Real-world conditions may differ. Please consider these calculations as a supplementary guide for designers.

Table 1: Static pull force (pull vs gap) - interaction chart
MPL 50x30x4 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 1200 Gs
120.0 mT
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
 warning
1 mm 1176 Gs
117.6 mT
 7.27 kg / 16.03 LBS
7270.9 g / 71.3 N
 warning
2 mm 1144 Gs
114.4 mT
 6.88 kg / 15.16 LBS
6877.1 g / 67.5 N
 warning
3 mm 1105 Gs
110.5 mT
 6.41 kg / 14.14 LBS
6414.7 g / 62.9 N
 warning
5 mm 1012 Gs
101.2 mT
 5.38 kg / 11.86 LBS
5381.2 g / 52.8 N
 warning
10 mm 754 Gs
75.4 mT
 2.99 kg / 6.59 LBS
2990.1 g / 29.3 N
 warning
15 mm 535 Gs
53.5 mT
 1.50 kg / 3.31 LBS
1503.5 g / 14.7 N
 safe
20 mm 376 Gs
37.6 mT
 0.74 kg / 1.64 LBS
743.3 g / 7.3 N
 safe
30 mm 193 Gs
19.3 mT
 0.20 kg / 0.43 LBS
195.8 g / 1.9 N
 safe
50 mm 64 Gs
6.4 mT
 0.02 kg / 0.05 LBS
21.4 g / 0.2 N
 safe
Magnetic force weakens drastically with every subsequent millimeter of gap. Remember that even a microscopic distance (e.g., dirt, paint, dust) noticeably reduces the pull force. Neodymiums hold strongest during direct contact; distance nullifies the force. Observe how rapidly the pull force drop, when the magnet does not touch flatly to the metal substrate. When planning the mounting, eliminate additional spacers.

Table 2: Vertical capacity (wall)
MPL 50x30x4 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
1 mm Stal (~0.2) 1.45 kg / 3.21 LBS
1454.0 g / 14.3 N
2 mm Stal (~0.2) 1.38 kg / 3.03 LBS
1376.0 g / 13.5 N
3 mm Stal (~0.2) 1.28 kg / 2.83 LBS
1282.0 g / 12.6 N
5 mm Stal (~0.2) 1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
10 mm Stal (~0.2) 0.60 kg / 1.32 LBS
598.0 g / 5.9 N
15 mm Stal (~0.2) 0.30 kg / 0.66 LBS
300.0 g / 2.9 N
20 mm Stal (~0.2) 0.15 kg / 0.33 LBS
148.0 g / 1.5 N
30 mm Stal (~0.2) 0.04 kg / 0.09 LBS
40.0 g / 0.4 N
50 mm Stal (~0.2) 0.00 kg / 0.01 LBS
4.0 g / 0.0 N
This section defines the estimated holding capacity necessary to start the slippage of the magnet down on a upright steel wall (assuming standard friction). The holding force is a function of the gap size between the magnet and the metal.

Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 50x30x4 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
2.27 kg / 5.01 LBS
2271.0 g / 22.3 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
0.76 kg / 1.67 LBS
757.0 g / 7.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
When mounting a holder on a upright wall (e.g., a board), it you can count on barely about 1/5 of its maximum pull force. Gravitational force as well as a low friction coefficient cause that magnets move down faster than they pull off. Planning a vertical fastening? Consider that the shear force is significantly lower than the maximum static pull force. On a slippery surface, the magnet will give way down under a significantly smaller cargo. Using a rubber pad can effectively increase the grip.

Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x30x4 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
10%
 0.76 kg / 1.67 LBS
757.0 g / 7.4 N
1 mm
25%
 1.89 kg / 4.17 LBS
1892.5 g / 18.6 N
2 mm
50%
 3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
3 mm
75%
 5.68 kg / 12.52 LBS
5677.5 g / 55.7 N
5 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
10 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
11 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
12 mm
100%
 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
A thin metal plate cannot absorb the full magnetic flux, which squanders power of the magnet. If you install a neodymium to a thin surface, the field will penetrate right through and the attraction force will be weaker. To utilize 100% of this magnet's power, you require a sufficiently solid backing of metal. The saturation phenomenon causes that on delicate walls (e.g., thin profiles), the product works worse. We suggest choosing the steel dimension based on the following data.

Table 5: Thermal stability (stability) - resistance threshold
MPL 50x30x4 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
 OK
40 °C -2.2% 7.40 kg / 16.32 LBS
7403.5 g / 72.6 N
 OK
60 °C -4.4% 7.24 kg / 15.95 LBS
7236.9 g / 71.0 N
80 °C -6.6% 7.07 kg / 15.59 LBS
7070.4 g / 69.4 N
100 °C -28.8% 5.39 kg / 11.88 LBS
5389.8 g / 52.9 N
Classic neodymiums lose parameters above the temperature limit. Avoid high temperatures – high temperature can permanently demagnetize this product. With every degree above norm, the neodymium's power briefly lowers. Refrain from using this magnet near heat sources higher than its operating temperature limit. Ignoring the limit will lead to irreversible degradation of magnetism.
*Engineering note: Heat tolerance is determined by both grade, but also on the magnet's shape. Flat magnets (low permeance coefficient) may lose charge permanently at lower temperatures compared to rod magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 50x30x4 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 13.32 kg / 29.37 LBS
2 260 Gs
2.00 kg / 4.41 LBS
1999 g / 19.6 N
 N/A
1 mm 13.09 kg / 28.85 LBS
2 379 Gs
1.96 kg / 4.33 LBS
1963 g / 19.3 N
 11.78 kg / 25.96 LBS
~0 Gs
2 mm 12.80 kg / 28.21 LBS
2 353 Gs
1.92 kg / 4.23 LBS
1920 g / 18.8 N
 11.52 kg / 25.39 LBS
~0 Gs
3 mm 12.47 kg / 27.49 LBS
2 322 Gs
1.87 kg / 4.12 LBS
1870 g / 18.3 N
 11.22 kg / 24.74 LBS
~0 Gs
5 mm 11.71 kg / 25.82 LBS
2 251 Gs
1.76 kg / 3.87 LBS
1756 g / 17.2 N
 10.54 kg / 23.23 LBS
~0 Gs
10 mm 9.47 kg / 20.88 LBS
2 024 Gs
1.42 kg / 3.13 LBS
1421 g / 13.9 N
 8.52 kg / 18.79 LBS
~0 Gs
20 mm 5.26 kg / 11.60 LBS
1 509 Gs
0.79 kg / 1.74 LBS
789 g / 7.7 N
 4.74 kg / 10.44 LBS
~0 Gs
50 mm 0.66 kg / 1.45 LBS
534 Gs
0.10 kg / 0.22 LBS
99 g / 1.0 N
 0.59 kg / 1.31 LBS
~0 Gs
60 mm 0.34 kg / 0.76 LBS
386 Gs
0.05 kg / 0.11 LBS
52 g / 0.5 N
 0.31 kg / 0.68 LBS
~0 Gs
70 mm 0.19 kg / 0.41 LBS
285 Gs
0.03 kg / 0.06 LBS
28 g / 0.3 N
 0.17 kg / 0.37 LBS
~0 Gs
80 mm 0.11 kg / 0.23 LBS
214 Gs
0.02 kg / 0.03 LBS
16 g / 0.2 N
 0.10 kg / 0.21 LBS
~0 Gs
90 mm 0.06 kg / 0.14 LBS
164 Gs
0.01 kg / 0.02 LBS
9 g / 0.1 N
 0.06 kg / 0.12 LBS
~0 Gs
100 mm 0.04 kg / 0.08 LBS
128 Gs
0.01 kg / 0.01 LBS
6 g / 0.1 N
 0.03 kg / 0.07 LBS
~0 Gs
Two magnets interact from a much further distance than a neodymium and metal combination. The setup of magnet-to-magnet creates a more powerful interaction and a further horizon of action. Want to build a strong closure? Utilize two neodymiums instead of a neodymium and a striker plate. Be careful that when attracting two neodymiums, the pinch force is huge. The repulsion force is slightly lower than the attraction, but still impressive.
*Flux density in repulsion mode reaches ~0 Gs in the exact middle of the gap (resulting from vector opposition).
* Estimates refer to sliding force of two matching magnets (friction ~0.15 for Ni-Ni plating).

Table 7: Hazards (implants) - precautionary measures
MPL 50x30x4 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 13.0 cm
Hearing aid 10 Gs (1.0 mT) 10.5 cm
Mechanical watch 20 Gs (2.0 mT) 8.0 cm
Phone / Smartphone 40 Gs (4.0 mT) 6.5 cm
Remote 50 Gs (5.0 mT) 6.0 cm
Payment card 400 Gs (40.0 mT) 2.0 cm
HDD hard drive 600 Gs (60.0 mT) 1.5 cm
Powerful magnet radiation poses a real danger to electronic devices as well as pacemakers. These neodymiums generate a flux that disrupts operation of digital equipment. Remember: the unseen radiation acts through matter and glass. Special caution must be taken by people with hearing aids and insulin pumps. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Avoid contact with magnetic cards, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MPL 50x30x4 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 15.99 km/h
(4.44 m/s)
 0.44 J
30 mm 23.02 km/h
(6.39 m/s)
 0.92 J
50 mm 29.30 km/h
(8.14 m/s)
 1.49 J
100 mm 41.37 km/h
(11.49 m/s)
 2.97 J
Neodymium magnets are very brittle – a violent impact against metal risks their cracking. Pay attention to connection velocity – a magnet released freely turns into a projectile. Striking energy can destroy the magnet or painful pinches to skin. Be sure to control the product during bringing near metal so it doesn't slam with momentum against the metal. A collision at high speed ends with a crack of the magnet. Wear safety glasses when handling with large magnets.

Table 9: Anti-corrosion coating durability
MPL 50x30x4 / 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)
The following table defines the conditions under which this product can be safely used. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Construction data (Flux)
MPL 50x30x4 / N38

Parameter Value SI Unit / Description
Magnetic Flux 22 399 Mx 224.0 µWb
Pc Coefficient 0.14 Low (Flat)
Total magnetic flux passing through the pole surface. Essential parameter when building generators as well as sensors. The Pc coefficient defines the working geometry.

Table 11: Physics of underwater searching
MPL 50x30x4 / N38

Environment Effective steel pull Effect
Air (land) 7.57 kg Standard
Water (riverbed) 8.67 kg
(+1.10 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.
Water displaces steel, making heavy objects slightly lighter. However, remember the water resistance when pulling the rope quickly.
1. Sliding resistance

*Warning: On a vertical wall, the magnet retains just a fraction of its perpendicular strength.

2. Steel thickness impact

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14

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.

Engineering data and GPSR
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%
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: 020497-2026
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Model MPL 50x30x4 / N38 features a low profile and industrial pulling force, making it an ideal solution for building separators and machines. As a magnetic bar with high power (approx. 7.57 kg), this product is available off-the-shelf from our warehouse in Poland. Furthermore, its Ni-Cu-Ni coating protects 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 7.57 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. Customers often choose this model for workshop organization on strips and for advanced DIY and modeling projects, where precision and power count.
Cyanoacrylate glues (super glue type) are good only for small magnets; for larger plates, we recommend resins. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Remember to clean and degrease the magnet surface before gluing, which significantly increases the adhesion of the glue to the nickel coating.
Standardly, the MPL 50x30x4 / N38 model is magnetized through the thickness (dimension 4 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.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 30 mm (width), and 4 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 7.57 kg (force ~74.26 N), which, with such a flat shape, proves the high grade of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Pros as well as cons of neodymium magnets.

Advantages

Besides their high retention, neodymium magnets are valued for these benefits:
  • They do not lose strength, even over nearly ten years – the decrease in power is only ~1% (based on measurements),
  • Magnets perfectly protect themselves against loss of magnetization caused by ambient magnetic noise,
  • Thanks to the smooth finish, the surface of nickel, gold-plated, or silver-plated gives an visually attractive appearance,
  • Magnets are characterized by very high magnetic induction on the outer layer,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
  • Possibility of detailed creating and adjusting to concrete needs,
  • Significant place in electronics industry – they are used in hard drives, brushless drives, diagnostic systems, as well as multitasking production systems.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Weaknesses

Problematic aspects of neodymium magnets: weaknesses and usage proposals
  • They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complicated shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small components of these products can complicate diagnosis medical in case of swallowing.
  • With mass production the cost of neodymium magnets is economically unviable,

Lifting parameters

Maximum lifting capacity of the magnet – what contributes to it?

The force parameter is a theoretical maximum value conducted under specific, ideal conditions:
  • on a base made of structural steel, optimally conducting the magnetic flux
  • possessing a massiveness of minimum 10 mm to avoid saturation
  • with an ideally smooth contact surface
  • without the slightest insulating layer between the magnet and steel
  • for force acting at a right angle (in the magnet axis)
  • at room temperature

Magnet lifting force in use – key factors

It is worth knowing that the magnet holding will differ influenced by elements below, in order of importance:
  • Gap between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) diminishes the pulling force, often by half at just 0.5 mm.
  • Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
  • 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 – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
  • Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces weaken the grip.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate lowers the load capacity.

Warnings
Allergic reactions

Medical facts indicate that nickel (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or choose coated magnets.

Health Danger

Warning for patients: Powerful magnets disrupt medical devices. Maintain minimum 30 cm distance or ask another person to work with the magnets.

GPS Danger

Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a strong magnet can decalibrate the internal compass in your phone.

Do not overheat magnets

Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. The loss of strength is permanent.

Finger safety

Risk of injury: The pulling power is so immense that it can result in hematomas, pinching, and broken bones. Use thick gloves.

Fire risk

Powder produced during cutting of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.

Danger to the youngest

Product intended for adults. Small elements pose a choking risk, causing intestinal necrosis. Keep out of reach of children and animals.

Protect data

Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Shattering risk

Despite the nickel coating, neodymium is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into hazardous fragments.

Do not underestimate power

Be careful. Neodymium magnets act from a distance and connect with huge force, often faster than you can move away.

Safety First! Need more info? Read our article: Are neodymium magnets dangerous?