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 - 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 |
Technical simulation of the assembly - technical parameters
These information are the outcome of a mathematical analysis. Results rely on algorithms for the material Nd2Fe14B. Operational conditions might slightly differ. Treat these data as a supplementary guide when designing systems.
Table 1: Static pull 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
|
dangerous! |
| 1 mm |
3234 Gs
323.4 mT
|
33.50 kg / 73.86 lbs
33501.5 g / 328.6 N
|
dangerous! |
| 2 mm |
3052 Gs
305.2 mT
|
29.85 kg / 65.80 lbs
29847.1 g / 292.8 N
|
dangerous! |
| 3 mm |
2866 Gs
286.6 mT
|
26.32 kg / 58.02 lbs
26317.3 g / 258.2 N
|
dangerous! |
| 5 mm |
2496 Gs
249.6 mT
|
19.97 kg / 44.02 lbs
19965.4 g / 195.9 N
|
dangerous! |
| 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
|
low risk |
| 50 mm |
137 Gs
13.7 mT
|
0.06 kg / 0.13 lbs
60.1 g / 0.6 N
|
low risk |
Table 2: Vertical 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
|
Table 3: Vertical assembly (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 (saturation) - 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: Working in heat (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 (repulsion) - 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 (electronics) - 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 |
| 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: 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 |
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) |
Table 10: Construction 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: 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% |
1. Vertical hold
*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Thermal stability
*For standard magnets, the max working temp 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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of neodymium magnets.
Pros
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (based on calculations),
- They have excellent resistance to weakening of magnetic properties due to external fields,
- In other words, due to the metallic layer of gold, the element gains visual value,
- They show high magnetic induction at the operating surface, which increases their power,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to flexibility in forming and the ability to adapt to complex applications,
- Fundamental importance in high-tech industry – they find application in magnetic memories, motor assemblies, medical devices, also technologically advanced constructions.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in compact constructions
Disadvantages
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- We recommend a housing - magnetic mount, due to difficulties in creating threads inside the magnet and complex forms.
- Health risk resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets can complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Lifting parameters
Maximum lifting capacity of the magnet – what affects it?
- with the contact of a sheet made of special test steel, ensuring full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- without the slightest air gap between the magnet and steel
- under perpendicular force direction (90-degree angle)
- at standard ambient temperature
Magnet lifting force in use – key factors
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
- Material type – the best choice is high-permeability steel. Stainless steels may attract less.
- Plate texture – ground elements ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
- Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Warnings
Do not overheat magnets
Control the heat. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and pulling force.
Magnet fragility
NdFeB magnets are ceramic materials, meaning they are prone to chipping. Collision of two magnets will cause them cracking into shards.
Data carriers
Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.
Allergic reactions
A percentage of the population suffer from a contact allergy to Ni, which is the standard coating for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use protective gloves.
Pacemakers
Life threat: Strong magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Swallowing risk
These products are not toys. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which poses a critical condition and necessitates urgent medical intervention.
Impact on smartphones
Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, tablet, and GPS.
Respect the power
Handle magnets consciously. Their huge power can shock even professionals. Be vigilant and respect their power.
Do not drill into magnets
Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
Bodily injuries
Danger of trauma: The pulling power is so immense that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
