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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

technical details »

45.51 ZŁ with VAT / pcs + price for transport

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Technical specification - 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

Technical analysis of the assembly - data

These values constitute the result of a physical analysis. Values rely on models for the material Nd2Fe14B. Real-world conditions may differ from theoretical values. Use these calculations as a supplementary guide when designing systems.

Table 1: Static force (force vs gap) - characteristics
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 pounds
37120.0 g / 364.1 N
 dangerous!
1 mm 3234 Gs
323.4 mT
 33.50 kg / 73.86 pounds
33501.5 g / 328.6 N
 dangerous!
2 mm 3052 Gs
305.2 mT
 29.85 kg / 65.80 pounds
29847.1 g / 292.8 N
 dangerous!
3 mm 2866 Gs
286.6 mT
 26.32 kg / 58.02 pounds
26317.3 g / 258.2 N
 dangerous!
5 mm 2496 Gs
249.6 mT
 19.97 kg / 44.02 pounds
19965.4 g / 195.9 N
 dangerous!
10 mm 1702 Gs
170.2 mT
 9.28 kg / 20.45 pounds
9278.2 g / 91.0 N
 warning
15 mm 1151 Gs
115.1 mT
 4.25 kg / 9.36 pounds
4246.0 g / 41.7 N
 warning
20 mm 792 Gs
79.2 mT
 2.01 kg / 4.44 pounds
2012.1 g / 19.7 N
 warning
30 mm 404 Gs
40.4 mT
 0.52 kg / 1.15 pounds
523.0 g / 5.1 N
 weak grip
50 mm 137 Gs
13.7 mT
 0.06 kg / 0.13 pounds
60.1 g / 0.6 N
 weak grip
Pulling power drops drastically with every subsequent millimeter of gap. Note that even a microscopic distance (e.g., contamination, paint, veneer) significantly diminishes the holding power. Magnetic products operate most effectively in perfect adhesion; distance weakens the force. Analyze how quickly the pull force plummet, when the product does not adhere flatly to the steel surface. When designing the arrangement, discard unnecessary gaps.

Table 2: Shear hold (wall)
MPL 50x25x12 / N38

Distance (mm) Friction coefficient Pull Force (kg/lbs/g/N)
0 mm Stal (~0.2) 7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
1 mm Stal (~0.2) 6.70 kg / 14.77 pounds
6700.0 g / 65.7 N
2 mm Stal (~0.2) 5.97 kg / 13.16 pounds
5970.0 g / 58.6 N
3 mm Stal (~0.2) 5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
5 mm Stal (~0.2) 3.99 kg / 8.81 pounds
3994.0 g / 39.2 N
10 mm Stal (~0.2) 1.86 kg / 4.09 pounds
1856.0 g / 18.2 N
15 mm Stal (~0.2) 0.85 kg / 1.87 pounds
850.0 g / 8.3 N
20 mm Stal (~0.2) 0.40 kg / 0.89 pounds
402.0 g / 3.9 N
30 mm Stal (~0.2) 0.10 kg / 0.23 pounds
104.0 g / 1.0 N
50 mm Stal (~0.2) 0.01 kg / 0.03 pounds
12.0 g / 0.1 N
The table below presents the approximate weight limit necessary to cause the slippage of the magnet vertically against a upright steel wall (assuming standard friction coefficient). This parameter is a function of the separation 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 pounds
11136.0 g / 109.2 N
Painted steel (standard)
µ = 0.2 20% Nominalnej Siły
7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
Oily/slippery steel
µ = 0.1 10% Nominalnej Siły
3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
Magnet with anti-slip rubber
µ = 0.5 50% Nominalnej Siły
18.56 kg / 40.92 pounds
18560.0 g / 182.1 N
When placing a holder on a vertical plane (e.g., a fridge), it will only hold barely about 20%-30% of its maximum pull force. Gravitational force as well as a weak degree of grip influence the fact that magnets slide down faster than they detach. Planning a vertical fastening? Consider that the sliding force is much weaker than the maximum static pull force. On a smooth steel, the holder will slide down under a significantly smaller cargo. Application of an anti-slip layer can drastically improve the result.

Table 4: Material efficiency (saturation) - sheet metal selection
MPL 50x25x12 / N38

Steel thickness (mm) % power Real pull force (kg/lbs/g/N)
0.5 mm
5%
 1.86 kg / 4.09 pounds
1856.0 g / 18.2 N
1 mm
13%
 4.64 kg / 10.23 pounds
4640.0 g / 45.5 N
2 mm
25%
 9.28 kg / 20.46 pounds
9280.0 g / 91.0 N
3 mm
38%
 13.92 kg / 30.69 pounds
13920.0 g / 136.6 N
5 mm
63%
 23.20 kg / 51.15 pounds
23200.0 g / 227.6 N
10 mm
100%
 37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
11 mm
100%
 37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
12 mm
100%
 37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
A thin sheet is unable to conduct the full magnetic flux, which weakens actual performance of the magnet. If you install a neodymium to a thin surface, the magnetism will pass right through and the pull force will drop sharply. To utilize 100% of this magnet's power, you need a suitably thick element of steel. The saturation phenomenon means that on thin elements (e.g., appliance housings), the product holds weaker. We suggest choosing the steel cross-section according to the table below.

Table 5: Thermal stability (stability) - power drop
MPL 50x25x12 / N38

Ambient temp. (°C) Power loss Remaining pull (kg/lbs/g/N) Status
20 °C 0.0% 37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
 OK
40 °C -2.2% 36.30 kg / 80.04 pounds
36303.4 g / 356.1 N
 OK
60 °C -4.4% 35.49 kg / 78.23 pounds
35486.7 g / 348.1 N
80 °C -6.6% 34.67 kg / 76.43 pounds
34670.1 g / 340.1 N
100 °C -28.8% 26.43 kg / 58.27 pounds
26429.4 g / 259.3 N
Classic neodymiums lose strength above the temperature limit. Avoid high temperatures – heat can permanently demagnetize this product. With increasing heat, the neodymium's power temporarily drops. Refrain from using this product near heat sources higher than its working range. Ignoring the limit will result in permanent loss of magnetism.
*Engineering note: Thermal stability depends not only on the material grade, as well as the dimension ratios. Thin magnets (low permeance coefficient) are more susceptible to demagnetization sooner than long magnets. Red status in the table signals permanent field degradation for this specific geometry.

Table 6: Magnet-Magnet interaction (repulsion) - field range
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 pounds
4 856 Gs
13.39 kg / 29.52 pounds
13392 g / 131.4 N
 N/A
1 mm 84.99 kg / 187.37 pounds
6 642 Gs
12.75 kg / 28.11 pounds
12749 g / 125.1 N
 76.49 kg / 168.63 pounds
~0 Gs
2 mm 80.57 kg / 177.64 pounds
6 467 Gs
12.09 kg / 26.65 pounds
12086 g / 118.6 N
 72.52 kg / 159.87 pounds
~0 Gs
3 mm 76.16 kg / 167.90 pounds
6 287 Gs
11.42 kg / 25.19 pounds
11424 g / 112.1 N
 68.54 kg / 151.11 pounds
~0 Gs
5 mm 67.49 kg / 148.78 pounds
5 919 Gs
10.12 kg / 22.32 pounds
10123 g / 99.3 N
 60.74 kg / 133.91 pounds
~0 Gs
10 mm 48.02 kg / 105.86 pounds
4 992 Gs
7.20 kg / 15.88 pounds
7203 g / 70.7 N
 43.22 kg / 95.28 pounds
~0 Gs
20 mm 22.32 kg / 49.20 pounds
3 403 Gs
3.35 kg / 7.38 pounds
3347 g / 32.8 N
 20.08 kg / 44.28 pounds
~0 Gs
50 mm 2.41 kg / 5.31 pounds
1 118 Gs
0.36 kg / 0.80 pounds
361 g / 3.5 N
 2.17 kg / 4.78 pounds
~0 Gs
60 mm 1.26 kg / 2.77 pounds
808 Gs
0.19 kg / 0.42 pounds
189 g / 1.9 N
 1.13 kg / 2.50 pounds
~0 Gs
70 mm 0.69 kg / 1.52 pounds
598 Gs
0.10 kg / 0.23 pounds
103 g / 1.0 N
 0.62 kg / 1.37 pounds
~0 Gs
80 mm 0.39 kg / 0.87 pounds
452 Gs
0.06 kg / 0.13 pounds
59 g / 0.6 N
 0.35 kg / 0.78 pounds
~0 Gs
90 mm 0.23 kg / 0.52 pounds
349 Gs
0.04 kg / 0.08 pounds
35 g / 0.3 N
 0.21 kg / 0.47 pounds
~0 Gs
100 mm 0.14 kg / 0.32 pounds
274 Gs
0.02 kg / 0.05 pounds
22 g / 0.2 N
 0.13 kg / 0.29 pounds
~0 Gs
Two magnetic products interact from a significantly greater distance than a magnet and steel setup. The connection of two magnets generates a stronger field and a wider radius of action. Want to build a strong closure? Apply two magnets instead of a neodymium and a steel. Be careful that when attracting two neodymiums, the collision energy is massive. The levitation is a bit weaker than the attraction, but still significant.
*The magnetic induction in repulsion mode reaches ~0 Gs at the midpoint between the magnets (due to field cancellation).
Note: Figures show shear force of dual same neodymium magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Protective zones (implants) - warnings
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
Remote 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
Powerful magnet radiation is a serious hazard to IT equipment and pacemakers. These neodymiums produce a field that prevents correct functioning of sensitive medical devices. Be aware: the invisible magnetic field penetrates the body and plastic. Increased vigilance must be taken by people with hearing aids and drug dispensers. The risk also applies to: automatic timepieces, car keys, speakers, and screens. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Impact energy (kinetic energy) - collision effects
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
NdFeB products are delicate – a strong collision with metal causes immediate chipping. Pay attention to connection velocity – a neodymium left loose speeds with massive force. Striking energy can destroy the magnet or injury to fingers. Hold the magnet firmly during installation so it doesn't hit with great force against the steel surface. A contact at a velocity of dozens of km/h means shattering of the neodymium. Wear eye protection when playing with large magnets.

Table 9: Surface protection spec
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. The silver nickel coating also serves an aesthetic function but is not fully waterproof.

Table 10: Construction 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 passing through the magnet pole. Key data in coil applications and motors. Pc value defines the working geometry.

Table 11: Physics of underwater searching
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: Standard nickel requires drying after every contact with moisture; lack of maintenance will lead to rust spots.
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

*Warning: On a vertical wall, the magnet holds only ~20% of its nominal pull.

2. Steel saturation

*Thin metal sheet (e.g. computer case) significantly limits the holding force.

3. Power loss vs temp

*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 and environmental data
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
Magnet Unit Converter
Pulling force
Magnetic Field
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Model MPL 50x25x12 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a magnetic bar with high power (approx. 37.12 kg), this product is available off-the-shelf from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating protects it against corrosion in standard operating conditions, giving it an aesthetic appearance.
The key to success is sliding 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 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.
Plate magnets MPL 50x25x12 / N38 are the foundation for many industrial devices, such as magnetic separators and linear motors. They work great as fasteners under tiles, wood, or glass. 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. Double-sided tape cushions vibrations, which is an advantage when mounting in moving elements. Avoid chemically aggressive glues or hot glue, which can demagnetize neodymium (above 80°C).
Standardly, the MPL 50x25x12 / N38 model is magnetized axially (dimension 12 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. This is the most popular configuration for block magnets used in separators and holders.
The presented product is a neodymium magnet with precisely defined parameters: 50 mm (length), 25 mm (width), and 12 mm (thickness). It is a magnetic block with dimensions 50x25x12 mm and a self-weight of 112.5 g, ready to work at temperatures up to 80°C. The product meets the standards for N38 grade magnets.

Advantages and disadvantages of neodymium magnets.

Benefits

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They have constant strength, and over around ten years their attraction force decreases symbolically – ~1% (in testing),
  • Magnets very well protect themselves against loss of magnetization caused by external fields,
  • By using a reflective layer of nickel, the element gains an aesthetic look,
  • Magnetic induction on the surface of the magnet turns out to be strong,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures reaching 230°C and above...
  • Thanks to the option of free shaping and adaptation to individualized needs, magnetic components can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
  • Universal use in modern technologies – they serve a role in hard drives, electric drive systems, medical devices, and complex engineering applications.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Weaknesses

Disadvantages of NdFeB magnets:
  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
  • We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can rust. Therefore during using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in realizing nuts and complicated forms in magnets, we recommend using a housing - magnetic mechanism.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Pull force analysis

Optimal lifting capacity of a neodymium magnet – what affects it?

Information about lifting capacity was defined for ideal contact conditions, taking into account:
  • using a base made of low-carbon steel, serving as a magnetic yoke
  • with a thickness minimum 10 mm
  • with a surface free of scratches
  • with total lack of distance (no impurities)
  • under axial application of breakaway force (90-degree angle)
  • in stable room temperature

Determinants of lifting force in real conditions

Holding efficiency is affected by working environment parameters, such as (from most important):
  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
  • Angle of force application – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – smooth surfaces ensure maximum contact, which increases force. Rough surfaces reduce efficiency.
  • Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. In addition, even a slight gap between the magnet’s surface and the plate reduces the holding force.

Safety rules for work with NdFeB magnets
Crushing risk

Big blocks can smash fingers in a fraction of a second. Never put your hand between two strong magnets.

Magnet fragility

Despite metallic appearance, neodymium is delicate and not impact-resistant. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Choking Hazard

Only for adults. Small elements can be swallowed, leading to severe trauma. Keep out of reach of children and animals.

Dust explosion hazard

Fire warning: Rare earth powder is explosive. Do not process magnets without safety gear as this may cause fire.

Sensitization to coating

A percentage of the population have a sensitization to nickel, which is the typical protective layer for NdFeB magnets. Prolonged contact may cause skin redness. It is best to use safety gloves.

GPS and phone interference

A strong magnetic field disrupts the functioning of compasses in smartphones and navigation systems. Maintain magnets close to a smartphone to avoid damaging the sensors.

Immense force

Handle magnets with awareness. Their powerful strength can surprise even professionals. Plan your moves and do not underestimate their force.

Cards and drives

Very strong magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Stay away of min. 10 cm.

Medical interference

Patients with a ICD have to maintain an absolute distance from magnets. The magnetism can disrupt the operation of the implant.

Thermal limits

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

Attention! Want to know more? Check our post: Why are neodymium magnets dangerous?