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MPL 50x25x12 / N38 - lamellar magnet

lamellar magnet

Catalog no 020343

GTIN/EAN: 5906301811855

5.00

length

50 mm [±0,1 mm]

Width

25 mm [±0,1 mm]

Height

12 mm [±0,1 mm]

Weight

112.5 g

Magnetization Direction

↑ axial

Load capacity

37.12 kg / 364.18 N

Magnetic Induction

340.43 mT / 3404 Gs

Coating

[NiCuNi] Nickel

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45.51 ZŁ with VAT / pcs + price for transport

37.00 ZŁ net + 23% VAT / pcs

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Technical details - MPL 50x25x12 / N38 - lamellar magnet

Specification / characteristics - MPL 50x25x12 / N38 - lamellar magnet

properties
properties values
Cat. no. 020343
GTIN/EAN 5906301811855
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 25 mm [±0,1 mm]
Height 12 mm [±0,1 mm]
Weight 112.5 g
Magnetization Direction ↑ axial
Load capacity ~ ? 37.12 kg / 364.18 N
Magnetic Induction ~ ? 340.43 mT / 3404 Gs
Coating [NiCuNi] Nickel
Manufacturing Tolerance ±0.1 mm

Magnetic properties of material N38

Specification / characteristics MPL 50x25x12 / 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 simulation of the magnet - technical parameters

Presented information represent the result of a engineering calculation. Values are based on models for the class Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.

Table 1: Static force (force vs distance) - interaction chart
MPL 50x25x12 / N38

Distance (mm) Induction (Gauss) / mT Pull Force (kg/lbs/g/N) Risk Status
0 mm 3404 Gs
340.4 mT
 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
 critical level
1 mm 3234 Gs
323.4 mT
 33.50 kg / 73.86 lbs
33501.5 g / 328.6 N
 critical level
2 mm 3052 Gs
305.2 mT
 29.85 kg / 65.80 lbs
29847.1 g / 292.8 N
 critical level
3 mm 2866 Gs
286.6 mT
 26.32 kg / 58.02 lbs
26317.3 g / 258.2 N
 critical level
5 mm 2496 Gs
249.6 mT
 19.97 kg / 44.02 lbs
19965.4 g / 195.9 N
 critical level
10 mm 1702 Gs
170.2 mT
 9.28 kg / 20.45 lbs
9278.2 g / 91.0 N
 warning
15 mm 1151 Gs
115.1 mT
 4.25 kg / 9.36 lbs
4246.0 g / 41.7 N
 warning
20 mm 792 Gs
79.2 mT
 2.01 kg / 4.44 lbs
2012.1 g / 19.7 N
 warning
30 mm 404 Gs
40.4 mT
 0.52 kg / 1.15 lbs
523.0 g / 5.1 N
 weak grip
50 mm 137 Gs
13.7 mT
 0.06 kg / 0.13 lbs
60.1 g / 0.6 N
 weak grip
Magnetic force drops significantly per each millimeter of distance. Remember that even the smallest gap (e.g., contamination, paint, rust) significantly diminishes the holding power. Neodymiums work strongest during direct contact; gap drastically cuts the power. Observe how flashily the parameters fall, when the magnet does not adhere flatly to the metal substrate. When planning the arrangement, avoid unnecessary gaps.

Table 2: Slippage force (wall)
MPL 50x25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 7.42 kg / 16.37 lbs
7424.0 g / 72.8 N
1 mm Stal (~0.2) 6.70 kg / 14.77 lbs
6700.0 g / 65.7 N
2 mm Stal (~0.2) 5.97 kg / 13.16 lbs
5970.0 g / 58.6 N
3 mm Stal (~0.2) 5.26 kg / 11.61 lbs
5264.0 g / 51.6 N
5 mm Stal (~0.2) 3.99 kg / 8.81 lbs
3994.0 g / 39.2 N
10 mm Stal (~0.2) 1.86 kg / 4.09 lbs
1856.0 g / 18.2 N
15 mm Stal (~0.2) 0.85 kg / 1.87 lbs
850.0 g / 8.3 N
20 mm Stal (~0.2) 0.40 kg / 0.89 lbs
402.0 g / 3.9 N
30 mm Stal (~0.2) 0.10 kg / 0.23 lbs
104.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 lbs
12.0 g / 0.1 N
The table below shows the estimated weight limit necessary to initiate the shifting of the magnet vertically against a upright steel plate (assuming typical friction coefficient). This parameter depends on the distance between the magnet and the metal.

Table 3: Vertical assembly (sliding) - vertical pull
MPL 50x25x12 / N38

Surface type Friction coefficient / % Mocy Max load (kg/lbs/g/N)
Raw steel
µ = 0.3 30% Nominalnej Siły
11.14 kg / 24.55 lbs
11136.0 g / 109.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
7.42 kg / 16.37 lbs
7424.0 g / 72.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.71 kg / 8.18 lbs
3712.0 g / 36.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
18.56 kg / 40.92 lbs
18560.0 g / 182.1 N
When hanging a element on a upright surface (e.g., a fridge), it will maintain barely approx. 1/5 of its nominal power. Gravitational force and a weak degree of grip cause that holders slide down faster than they pull off. Designing a vertical fastening? Note that the sliding force is significantly lower than the maximum static pull force. On a smooth steel, the magnet will give way down under a much lighter weight. Application of an anti-slip coating can drastically improve the result.

Table 4: Steel thickness (substrate influence) - power losses
MPL 50x25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.86 kg / 4.09 lbs
1856.0 g / 18.2 N
1 mm
13%
 4.64 kg / 10.23 lbs
4640.0 g / 45.5 N
2 mm
25%
 9.28 kg / 20.46 lbs
9280.0 g / 91.0 N
3 mm
38%
 13.92 kg / 30.69 lbs
13920.0 g / 136.6 N
5 mm
63%
 23.20 kg / 51.15 lbs
23200.0 g / 227.6 N
10 mm
100%
 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
11 mm
100%
 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
12 mm
100%
 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
A thin sheet is unable to conduct the full magnetic flux, which squanders power of the holder. Should you attach a powerful product to a too thin substrate, the magnetism will penetrate right through and the holding will be smaller. To utilize the maximum of this neodymium's potential, you require a sufficiently solid element of steel. The material oversaturation causes that on delicate walls (e.g., car bodies), the holder works worse. We suggest choosing the steel cross-section based on the following data.

Table 5: Thermal stability (material behavior) - thermal limit
MPL 50x25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 37.12 kg / 81.84 lbs
37120.0 g / 364.1 N
 OK
40 °C -2.2% 36.30 kg / 80.04 lbs
36303.4 g / 356.1 N
 OK
60 °C -4.4% 35.49 kg / 78.23 lbs
35486.7 g / 348.1 N
80 °C -6.6% 34.67 kg / 76.43 lbs
34670.1 g / 340.1 N
100 °C -28.8% 26.43 kg / 58.27 lbs
26429.4 g / 259.3 N
Ordinary NdFeB products lose strength above the temperature limit. Watch out for overheating – heat can irreversibly demagnetize this product. As the temperature rises, the magnet's power temporarily decreases. Refrain from using this product near heat sources exceeding its safe range. Ignoring the limit will result in irreversible degradation of magnetic properties.
*Engineering note: Thermal stability is determined by both grade, but also on the magnet's shape. Thin magnets (pancake types) may lose charge permanently sooner compared to rod magnets. The danger warning in the table signals a risk of irreversible loss for this particular item.

Table 6: Two magnets (repulsion) - forces in the system
MPL 50x25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Lateral Force (kg/lbs/g/N) Repulsion (kg/lbs) (N-N)
0 mm 89.28 kg / 196.82 lbs
4 856 Gs
13.39 kg / 29.52 lbs
13392 g / 131.4 N
 N/A
1 mm 84.99 kg / 187.37 lbs
6 642 Gs
12.75 kg / 28.11 lbs
12749 g / 125.1 N
 76.49 kg / 168.63 lbs
~0 Gs
2 mm 80.57 kg / 177.64 lbs
6 467 Gs
12.09 kg / 26.65 lbs
12086 g / 118.6 N
 72.52 kg / 159.87 lbs
~0 Gs
3 mm 76.16 kg / 167.90 lbs
6 287 Gs
11.42 kg / 25.19 lbs
11424 g / 112.1 N
 68.54 kg / 151.11 lbs
~0 Gs
5 mm 67.49 kg / 148.78 lbs
5 919 Gs
10.12 kg / 22.32 lbs
10123 g / 99.3 N
 60.74 kg / 133.91 lbs
~0 Gs
10 mm 48.02 kg / 105.86 lbs
4 992 Gs
7.20 kg / 15.88 lbs
7203 g / 70.7 N
 43.22 kg / 95.28 lbs
~0 Gs
20 mm 22.32 kg / 49.20 lbs
3 403 Gs
3.35 kg / 7.38 lbs
3347 g / 32.8 N
 20.08 kg / 44.28 lbs
~0 Gs
50 mm 2.41 kg / 5.31 lbs
1 118 Gs
0.36 kg / 0.80 lbs
361 g / 3.5 N
 2.17 kg / 4.78 lbs
~0 Gs
60 mm 1.26 kg / 2.77 lbs
808 Gs
0.19 kg / 0.42 lbs
189 g / 1.9 N
 1.13 kg / 2.50 lbs
~0 Gs
70 mm 0.69 kg / 1.52 lbs
598 Gs
0.10 kg / 0.23 lbs
103 g / 1.0 N
 0.62 kg / 1.37 lbs
~0 Gs
80 mm 0.39 kg / 0.87 lbs
452 Gs
0.06 kg / 0.13 lbs
59 g / 0.6 N
 0.35 kg / 0.78 lbs
~0 Gs
90 mm 0.23 kg / 0.52 lbs
349 Gs
0.04 kg / 0.08 lbs
35 g / 0.3 N
 0.21 kg / 0.47 lbs
~0 Gs
100 mm 0.14 kg / 0.32 lbs
274 Gs
0.02 kg / 0.05 lbs
22 g / 0.2 N
 0.13 kg / 0.29 lbs
~0 Gs
Two magnetic products interact from a much further distance than a magnet and steel setup. The setup of magnet-to-magnet generates a stronger field and a further horizon of action. Designing a powerful holder? Utilize two neodymiums instead of a neodymium and a steel. Remember that when attracting two neodymiums, the pinch force is extreme. The levitation is slightly lower than the attraction, but still impressive.
*The magnetic induction in repulsion mode is approximately ~0 Gs at the geometric center between the magnets (resulting from vector opposition).
Note: Figures refer to sliding force of dual identical neodymium magnets (friction coefficient ~0.15 for Ni-Ni plating).

Table 7: Safety (HSE) (implants) - precautionary measures
MPL 50x25x12 / N38

Object / Device Limit (Gauss) / mT Safe distance
Pacemaker 5 Gs (0.5 mT) 17.5 cm
Hearing aid 10 Gs (1.0 mT) 14.0 cm
Mechanical watch 20 Gs (2.0 mT) 11.0 cm
Mobile device 40 Gs (4.0 mT) 8.5 cm
Car key 50 Gs (5.0 mT) 8.0 cm
Payment card 400 Gs (40.0 mT) 3.5 cm
HDD hard drive 600 Gs (60.0 mT) 2.5 cm
Extremely neodym field is a serious hazard to electronic devices and medical implants. These magnets produce a field that disrupts operation of digital equipment. Notice: the invisible magnetic field passes through tissues and glass. Special caution must be exercised 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, HDD media, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - warning
MPL 50x25x12 / N38

Start from (mm) Speed (km/h) Energy (J) Predicted outcome
10 mm 20.99 km/h
(5.83 m/s)
 1.91 J
30 mm 32.01 km/h
(8.89 m/s)
 4.45 J
50 mm 41.00 km/h
(11.39 m/s)
 7.30 J
100 mm 57.93 km/h
(16.09 m/s)
 14.57 J
Neodymium magnets are prone to chipping – a strong collision with metal can result in shattering. Pay attention to connection velocity – a magnet released freely turns into a projectile. Impact energy can trigger coating fragments or dangerous crushing to fingers. Hold the magnet firmly during installation 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 safety glasses when handling with large magnets.

Table 9: Coating parameters (durability)
MPL 50x25x12 / 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 (Flux)
MPL 50x25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 42 945 Mx 429.5 µWb
Pc Coefficient 0.40 Low (Flat)
Total magnetic flux emitted by the pole surface. Key data in coil applications and motors. The Pc coefficient determines the magnet's operating point.

Table 11: Underwater work (magnet fishing)
MPL 50x25x12 / N38

Environment Effective steel pull Effect
Air (land) 37.12 kg Standard
Water (riverbed) 42.50 kg
(+5.38 kg buoyancy gain)
+14.5%
Rust risk: This magnet has a standard nickel coating. After use in water, it must be dried and maintained immediately, otherwise it will rust!
The magnetic field penetrates through water without any losses. However, remember the water resistance when pulling the rope quickly.
1. Shear force

*Note: On a vertical wall, the magnet retains only a fraction of its max power.

2. Steel saturation

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

3. Thermal stability

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

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

chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40

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
Elemental analysis
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: 020343-2026
Quick Unit Converter
Force (pull)
Magnetic Induction
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This product is a very powerful plate magnet made of NdFeB material, which, with dimensions of 50x25x12 mm and a weight of 112.5 g, guarantees premium class connection. This rectangular block with a force of 364.18 N is ready for shipment in 24h, allowing for rapid realization of your project. Additionally, its Ni-Cu-Ni coating secures it against corrosion in standard operating conditions, giving it an aesthetic appearance.
Separating strong flat 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 37.12 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 generators and material handling systems. Thanks to the flat surface and high force (approx. 37.12 kg), they are ideal as hidden locks in furniture making and mounting elements in automation. 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 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. 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), 25 mm (width), and 12 mm (thickness). The key parameter here is the lifting capacity amounting to approximately 37.12 kg (force ~364.18 N), which, with such a flat shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of rare earth magnets.

Advantages

Besides their immense field intensity, neodymium magnets offer the following advantages:
  • They do not lose strength, even after nearly ten years – the drop in power is only ~1% (based on measurements),
  • They maintain their magnetic properties even under strong external field,
  • Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
  • 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...
  • Considering the option of accurate shaping and adaptation to individualized solutions, neodymium magnets can be manufactured in a wide range of forms and dimensions, which makes them more universal,
  • Versatile presence in modern industrial fields – they serve a role in computer drives, electric drive systems, advanced medical instruments, and multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Limitations

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals
  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
  • We suggest casing - magnetic holder, due to difficulties in creating nuts inside the magnet and complicated forms.
  • Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Additionally, 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

Pull force analysis

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Holding force of 37.12 kg is a result of laboratory testing conducted under specific, ideal conditions:
  • using a sheet made of low-carbon steel, acting as a ideal flux conductor
  • whose thickness equals approx. 10 mm
  • with an polished touching surface
  • without the slightest clearance between the magnet and steel
  • for force applied at a right angle (pull-off, not shear)
  • at conditions approx. 20°C

Lifting capacity in practice – influencing factors

It is worth knowing that the working load may be lower subject to elements below, starting with the most relevant:
  • Distance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
  • Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
  • Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
  • Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the lifting capacity is smaller. Additionally, even a slight gap between the magnet and the plate decreases the lifting capacity.

H&S for magnets
Swallowing risk

Neodymium magnets are not intended for children. Accidental ingestion of several magnets may result in them attracting across intestines, which poses a critical condition and requires immediate surgery.

Risk of cracking

NdFeB magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them cracking into shards.

Do not underestimate power

Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and do not underestimate their power.

Heat sensitivity

Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and strength.

Protect data

Equipment safety: Neodymium magnets can ruin payment cards and sensitive devices (heart implants, medical aids, timepieces).

Bodily injuries

Danger of trauma: The pulling power is so immense that it can result in hematomas, crushing, and broken bones. Use thick gloves.

Nickel allergy

Medical facts indicate that nickel (the usual finish) is a strong allergen. For allergy sufferers, refrain from touching magnets with bare hands or select encased magnets.

Implant safety

People with a ICD have to maintain an safe separation from magnets. The magnetism can interfere with the functioning of the life-saving device.

Phone sensors

A strong magnetic field negatively affects the operation of magnetometers in phones and navigation systems. Maintain magnets close to a device to prevent damaging the sensors.

Do not drill into magnets

Dust created during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.

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