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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

check technical data »

45.51 ZŁ with VAT / pcs + price for transport

37.00 ZŁ net + 23% VAT / pcs

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Technical parameters - 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 analysis of the product - technical parameters

Presented information represent the direct effect of a physical analysis. Results were calculated on models for the material Nd2Fe14B. Operational conditions might slightly differ. Use these calculations as a preliminary roadmap when designing systems.

Table 1: Static pull force (force vs distance) - power drop
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
 medium risk
15 mm 1151 Gs
115.1 mT
 4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
 medium risk
20 mm 792 Gs
79.2 mT
 2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
 medium risk
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
Grip strength drops sharply with every subsequent millimeter of spacing. Note that even a microscopic distance (e.g., contamination, paint, dust) strongly reduces the pull force. Neodymiums work most effectively in perfect adhesion; air break weakens the force. Observe how flashily the parameters drop, when the magnet does not adhere tightly to the steel surface. When planning the arrangement, avoid redundant distances.

Table 2: Shear hold (vertical surface)
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 following data presents the theoretical holding capacity required to start the shifting of the magnet down on a vertical steel plate (considering typical friction coefficient). This parameter is a function of the gap size between the magnet and the surface.

Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 placing a element on a upright wall (e.g., a car body), it will maintain just about 20%-30% of nominal attraction strength. Gravity as well as a low friction coefficient influence the fact that magnets move down easier than they pop off the substrate. Want to create a wall mount? Remember that the shear force is significantly lower than the perpendicular breakaway force. On a slippery surface, the holder will give way down under a much lighter weight. Utilizing a rubberized coating can significantly raise the stability.

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 incapable of take in the full magnetic flux, which weakens actual performance of the magnet. If you attach a powerful product to a too thin substrate, the field will pass right through and the pull force will drop sharply. To achieve the maximum of this magnet's potential, you need a suitably thick piece of metal. The saturation effect causes that on sheet metal structures (e.g., appliance housings), the magnet holds weaker. We recommend selecting the steel cross-section from these parameters.

Table 5: Thermal stability (stability) - resistance threshold
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
Standard neodymium magnets irreversibly lose strength past the thermal threshold. Protect against heat – heat can irreversibly damage this product. With every degree above norm, the neodymium's power temporarily drops. Refrain from using this product close to heaters higher than its working range. Exceeding the critical threshold will lead to permanent loss of magnetic properties.
*Important note: Heat tolerance is determined by both grade, but also on the magnet's shape. Thin magnets (low permeance coefficient) are more susceptible to demagnetization at lower temperatures than long magnets. Red status in the table indicates permanent field degradation for this particular item.

Table 6: Two magnets (repulsion) - field collision
MPL 50x25x12 / N38

Gap (mm) Attraction (kg/lbs) (N-S) Shear 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 attract each other from a wider radius than a magnet and steel setup. The setup of two magnets generates a stronger field and a larger range of operation. Want to build a strong closure? Utilize two neodymiums instead of one magnet and a steel. Exercise caution that when connecting a pair of magnets, the collision energy is extreme. The repulsion force is a bit weaker than the attraction, but still significant.
*The magnetic induction between like poles reaches ~0 Gs at the midpoint between the magnets (caused by magnetic field nullification).
Note: Estimates apply to shear force of a pair of same magnets (friction coefficient ~0.15 for Ni-Ni layer).

Table 7: Hazards (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
Timepiece 20 Gs (2.0 mT) 11.0 cm
Phone / Smartphone 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
Powerful magnet radiation poses a serious hazard to electronic devices and pacemakers. These magnets generate a field that prevents correct functioning of sensitive medical devices. Notice: the unseen radiation acts through matter and plastic. Special caution must be taken by people with cochlear implants and insulin pumps. Also at risk are: mechanical watches, remotes, membranes, and displays. Do not place the magnet near cards, hard drives, or sensitive navigation tools.

Table 8: Collisions (cracking risk) - 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
Magnetic elements are prone to chipping – a strong collision with metal causes immediate chipping. Watch the impact speed – a magnet released freely speeds with massive force. Kinetic force can destroy the magnet or injury to fingers. Be sure to control the product during installation so it doesn't slam with momentum against the steel surface. A collision at high speed ends with a crack of the magnet. Wear safety glasses when working 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)
The SST (salt spray test) is an industry standard for determining coating lifespan in harsh conditions. Improper coating selection is the most common cause of magnet failure over time.

Table 10: Electrical data (Pc)
MPL 50x25x12 / N38

Parameter Value SI Unit / Description
Magnetic Flux 42 945 Mx 429.5 µWb
Pc Coefficient 0.40 Low (Flat)
Flux value passing through the magnet pole. Essential parameter for generator designers and motors. The Pc coefficient defines the magnet's operating point.

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. As a result, your magnet will pull a heavier object from the bottom than if you lifted it in the air.
1. Vertical hold

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

2. Efficiency vs thickness

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

3. Power loss vs temp

*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) = 0.40

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 specification and ecology
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%
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: 020343-2026
Quick Unit Converter
Force (pull)
Magnetic Field
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Component MPL 50x25x12 / N38 features a low profile and professional pulling force, making it a perfect solution for building separators and machines. As a block magnet with high power (approx. 37.12 kg), this product is available immediately from our warehouse in Poland. Additionally, its Ni-Cu-Ni coating secures 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. To separate the MPL 50x25x12 / N38 model, firmly slide one magnet over the edge of the other until the attraction force decreases. We recommend care, 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 generators and material handling systems. They work great as fasteners under tiles, wood, or glass. Their rectangular shape facilitates precise gluing into milled sockets in wood or plastic.
For mounting flat magnets MPL 50x25x12 / N38, we recommend utilizing strong epoxy glues (e.g., UHU Endfest, Distal), which ensure a durable bond with metal or plastic. 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).
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 50x25x12 mm, which, at a weight of 112.5 g, makes it an element with impressive energy density. The key parameter here is the holding force amounting to approximately 37.12 kg (force ~364.18 N), which, with such a compact shape, proves the high power of the material. The protective [NiCuNi] coating secures the magnet against corrosion.

Advantages and disadvantages of Nd2Fe14B magnets.

Strengths

Besides their exceptional magnetic power, neodymium magnets offer the following advantages:
  • They do not lose magnetism, even over around ten years – the reduction in power is only ~1% (theoretically),
  • They possess excellent resistance to magnetic field loss when exposed to external magnetic sources,
  • The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
  • Neodymium magnets achieve maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling operation at temperatures reaching 230°C and above...
  • Due to the ability of accurate molding and adaptation to unique requirements, NdFeB magnets can be created in a wide range of geometric configurations, which expands the range of possible applications,
  • Huge importance in advanced technology sectors – they are commonly used in HDD drives, electromotive mechanisms, medical devices, as well as industrial machines.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Limitations

What to avoid - cons of neodymium magnets: application proposals
  • To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
  • They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
  • We recommend casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
  • Health risk resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets can be a barrier,

Lifting parameters

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

The lifting capacity listed is a measurement result conducted under specific, ideal conditions:
  • with the use of a yoke made of special test steel, guaranteeing maximum field concentration
  • with a cross-section minimum 10 mm
  • characterized by smoothness
  • without any air gap between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • at temperature approx. 20 degrees Celsius

Lifting capacity in practice – influencing factors

Effective lifting capacity impacted by specific conditions, such as (from priority):
  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
  • Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
  • Thermal factor – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a small distance between the magnet and the plate lowers the load capacity.

Safety rules for work with NdFeB magnets
Hand protection

Large magnets can smash fingers instantly. Do not put your hand betwixt two attracting surfaces.

Allergy Warning

A percentage of the population have a hypersensitivity to nickel, which is the standard coating for NdFeB magnets. Extended handling can result in an allergic reaction. We strongly advise wear safety gloves.

Implant safety

Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.

Magnetic interference

An intense magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a smartphone to avoid damaging the sensors.

Electronic hazard

Data protection: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).

Safe operation

Use magnets consciously. Their huge power can surprise even experienced users. Stay alert and do not underestimate their power.

Dust is flammable

Powder produced during cutting of magnets is combustible. Do not drill into magnets without proper cooling and knowledge.

Shattering risk

Beware of splinters. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Permanent damage

Do not overheat. Neodymium magnets are sensitive to temperature. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).

No play value

Neodymium magnets are not intended for children. Eating a few magnets can lead to them pinching intestinal walls, which poses a severe health hazard and requires immediate surgery.

Warning! Looking for details? Read our article: Why are neodymium magnets dangerous?