MPL 50x25x12 / N38 - lamellar magnet
lamellar magnet
Catalog no 020343
GTIN/EAN: 5906301811855
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
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 | values |
|---|---|
| Cat. no. | 020343 |
| GTIN/EAN | 5906301811855 |
| Production/Distribution | Dhit sp. z o.o. |
| 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
| 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
| 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 - report
The following data are the outcome of a physical calculation. Results are based on models for the class Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Treat these calculations as a supplementary guide when designing systems.
Table 1: Static pull force (pull 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
|
crushing |
| 1 mm |
3234 Gs
323.4 mT
|
33.50 kg / 73.86 LBS
33501.5 g / 328.6 N
|
crushing |
| 2 mm |
3052 Gs
305.2 mT
|
29.85 kg / 65.80 LBS
29847.1 g / 292.8 N
|
crushing |
| 3 mm |
2866 Gs
286.6 mT
|
26.32 kg / 58.02 LBS
26317.3 g / 258.2 N
|
crushing |
| 5 mm |
2496 Gs
249.6 mT
|
19.97 kg / 44.02 LBS
19965.4 g / 195.9 N
|
crushing |
| 10 mm |
1702 Gs
170.2 mT
|
9.28 kg / 20.45 LBS
9278.2 g / 91.0 N
|
strong |
| 15 mm |
1151 Gs
115.1 mT
|
4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
|
strong |
| 20 mm |
792 Gs
79.2 mT
|
2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
|
strong |
| 30 mm |
404 Gs
40.4 mT
|
0.52 kg / 1.15 LBS
523.0 g / 5.1 N
|
safe |
| 50 mm |
137 Gs
13.7 mT
|
0.06 kg / 0.13 LBS
60.1 g / 0.6 N
|
safe |
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
|
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
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x25x12 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.86 kg / 4.09 LBS
1856.0 g / 18.2 N
|
| 1 mm |
|
4.64 kg / 10.23 LBS
4640.0 g / 45.5 N
|
| 2 mm |
|
9.28 kg / 20.46 LBS
9280.0 g / 91.0 N
|
| 3 mm |
|
13.92 kg / 30.69 LBS
13920.0 g / 136.6 N
|
| 5 mm |
|
23.20 kg / 51.15 LBS
23200.0 g / 227.6 N
|
| 10 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
| 11 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
| 12 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
Table 5: Thermal stability (material behavior) - 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
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 50x25x12 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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
|
Table 7: Protective zones (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 |
| Phone / Smartphone | 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 |
Table 8: Impact energy (kinetic energy) - 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 |
Table 9: Anti-corrosion coating 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) |
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) |
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% |
1. Vertical hold
*Warning: On a vertical wall, the magnet retains merely a fraction of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly weakens 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
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths and weaknesses of Nd2Fe14B magnets.
Pros
- Their power remains stable, and after approximately ten years it drops only by ~1% (theoretically),
- Magnets very well defend themselves against demagnetization caused by ambient magnetic noise,
- In other words, due to the smooth layer of silver, the element is aesthetically pleasing,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of detailed shaping as well as adapting to individual needs,
- Fundamental importance in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, also industrial machines.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages
- They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- Neodymium magnets lose their force 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
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using casing - magnetic holder.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can be problematic in diagnostics medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Optimal lifting capacity of a neodymium magnet – what contributes to it?
- on a base made of structural steel, optimally conducting the magnetic flux
- with a thickness of at least 10 mm
- with an ideally smooth contact surface
- under conditions of no distance (surface-to-surface)
- during pulling in a direction vertical to the mounting surface
- at standard ambient temperature
What influences lifting capacity in practice
- Air gap (between the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Material type – the best choice is high-permeability steel. Hardened steels may attract less.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the load capacity.
Warnings
Nickel allergy
Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.
Do not drill into magnets
Dust created during grinding of magnets is flammable. Avoid drilling into magnets unless you are an expert.
Hand protection
Pinching hazard: The pulling power is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Immense force
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.
Danger to pacemakers
Warning for patients: Strong magnetic fields affect electronics. Maintain at least 30 cm distance or request help to work with the magnets.
Eye protection
Beware of splinters. Magnets can fracture upon violent connection, ejecting sharp fragments into the air. Eye protection is mandatory.
Operating temperature
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Cards and drives
Intense magnetic fields can destroy records on payment cards, hard drives, and other magnetic media. Maintain a gap of at least 10 cm.
Swallowing risk
Strictly store magnets away from children. Choking hazard is significant, and the effects of magnets clamping inside the body are very dangerous.
Phone sensors
GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
