MPL 50x30x4 / N38 - lamellar magnet
lamellar magnet
Catalog no 020497
GTIN/EAN: 5906301814955
length
50 mm [±0,1 mm]
Width
30 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
45 g
Magnetization Direction
↑ axial
Load capacity
7.57 kg / 74.26 N
Magnetic Induction
120.04 mT / 1200 Gs
Coating
[NiCuNi] Nickel
25.83 ZŁ with VAT / pcs + price for transport
21.00 ZŁ net + 23% VAT / pcs
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Technical - MPL 50x30x4 / N38 - lamellar magnet
Specification / characteristics - MPL 50x30x4 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020497 |
| GTIN/EAN | 5906301814955 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 30 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 45 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 7.57 kg / 74.26 N |
| Magnetic Induction ~ ? | 120.04 mT / 1200 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 modeling of the magnet - technical parameters
Presented information constitute the result of a engineering calculation. Results are based on models for the class Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs distance) - interaction chart
MPL 50x30x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1200 Gs
120.0 mT
|
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
strong |
| 1 mm |
1176 Gs
117.6 mT
|
7.27 kg / 16.03 LBS
7270.9 g / 71.3 N
|
strong |
| 2 mm |
1144 Gs
114.4 mT
|
6.88 kg / 15.16 LBS
6877.1 g / 67.5 N
|
strong |
| 3 mm |
1105 Gs
110.5 mT
|
6.41 kg / 14.14 LBS
6414.7 g / 62.9 N
|
strong |
| 5 mm |
1012 Gs
101.2 mT
|
5.38 kg / 11.86 LBS
5381.2 g / 52.8 N
|
strong |
| 10 mm |
754 Gs
75.4 mT
|
2.99 kg / 6.59 LBS
2990.1 g / 29.3 N
|
strong |
| 15 mm |
535 Gs
53.5 mT
|
1.50 kg / 3.31 LBS
1503.5 g / 14.7 N
|
safe |
| 20 mm |
376 Gs
37.6 mT
|
0.74 kg / 1.64 LBS
743.3 g / 7.3 N
|
safe |
| 30 mm |
193 Gs
19.3 mT
|
0.20 kg / 0.43 LBS
195.8 g / 1.9 N
|
safe |
| 50 mm |
64 Gs
6.4 mT
|
0.02 kg / 0.05 LBS
21.4 g / 0.2 N
|
safe |
Table 2: Shear load (wall)
MPL 50x30x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
|
| 1 mm | Stal (~0.2) |
1.45 kg / 3.21 LBS
1454.0 g / 14.3 N
|
| 2 mm | Stal (~0.2) |
1.38 kg / 3.03 LBS
1376.0 g / 13.5 N
|
| 3 mm | Stal (~0.2) |
1.28 kg / 2.83 LBS
1282.0 g / 12.6 N
|
| 5 mm | Stal (~0.2) |
1.08 kg / 2.37 LBS
1076.0 g / 10.6 N
|
| 10 mm | Stal (~0.2) |
0.60 kg / 1.32 LBS
598.0 g / 5.9 N
|
| 15 mm | Stal (~0.2) |
0.30 kg / 0.66 LBS
300.0 g / 2.9 N
|
| 20 mm | Stal (~0.2) |
0.15 kg / 0.33 LBS
148.0 g / 1.5 N
|
| 30 mm | Stal (~0.2) |
0.04 kg / 0.09 LBS
40.0 g / 0.4 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 50x30x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.27 kg / 5.01 LBS
2271.0 g / 22.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.51 kg / 3.34 LBS
1514.0 g / 14.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.76 kg / 1.67 LBS
757.0 g / 7.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 50x30x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.76 kg / 1.67 LBS
757.0 g / 7.4 N
|
| 1 mm |
|
1.89 kg / 4.17 LBS
1892.5 g / 18.6 N
|
| 2 mm |
|
3.79 kg / 8.34 LBS
3785.0 g / 37.1 N
|
| 3 mm |
|
5.68 kg / 12.52 LBS
5677.5 g / 55.7 N
|
| 5 mm |
|
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
| 10 mm |
|
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
| 11 mm |
|
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
| 12 mm |
|
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
Table 5: Thermal stability (material behavior) - power drop
MPL 50x30x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.57 kg / 16.69 LBS
7570.0 g / 74.3 N
|
OK |
| 40 °C | -2.2% |
7.40 kg / 16.32 LBS
7403.5 g / 72.6 N
|
OK |
| 60 °C | -4.4% |
7.24 kg / 15.95 LBS
7236.9 g / 71.0 N
|
|
| 80 °C | -6.6% |
7.07 kg / 15.59 LBS
7070.4 g / 69.4 N
|
|
| 100 °C | -28.8% |
5.39 kg / 11.88 LBS
5389.8 g / 52.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 50x30x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
13.32 kg / 29.37 LBS
2 260 Gs
|
2.00 kg / 4.41 LBS
1999 g / 19.6 N
|
N/A |
| 1 mm |
13.09 kg / 28.85 LBS
2 379 Gs
|
1.96 kg / 4.33 LBS
1963 g / 19.3 N
|
11.78 kg / 25.96 LBS
~0 Gs
|
| 2 mm |
12.80 kg / 28.21 LBS
2 353 Gs
|
1.92 kg / 4.23 LBS
1920 g / 18.8 N
|
11.52 kg / 25.39 LBS
~0 Gs
|
| 3 mm |
12.47 kg / 27.49 LBS
2 322 Gs
|
1.87 kg / 4.12 LBS
1870 g / 18.3 N
|
11.22 kg / 24.74 LBS
~0 Gs
|
| 5 mm |
11.71 kg / 25.82 LBS
2 251 Gs
|
1.76 kg / 3.87 LBS
1756 g / 17.2 N
|
10.54 kg / 23.23 LBS
~0 Gs
|
| 10 mm |
9.47 kg / 20.88 LBS
2 024 Gs
|
1.42 kg / 3.13 LBS
1421 g / 13.9 N
|
8.52 kg / 18.79 LBS
~0 Gs
|
| 20 mm |
5.26 kg / 11.60 LBS
1 509 Gs
|
0.79 kg / 1.74 LBS
789 g / 7.7 N
|
4.74 kg / 10.44 LBS
~0 Gs
|
| 50 mm |
0.66 kg / 1.45 LBS
534 Gs
|
0.10 kg / 0.22 LBS
99 g / 1.0 N
|
0.59 kg / 1.31 LBS
~0 Gs
|
| 60 mm |
0.34 kg / 0.76 LBS
386 Gs
|
0.05 kg / 0.11 LBS
52 g / 0.5 N
|
0.31 kg / 0.68 LBS
~0 Gs
|
| 70 mm |
0.19 kg / 0.41 LBS
285 Gs
|
0.03 kg / 0.06 LBS
28 g / 0.3 N
|
0.17 kg / 0.37 LBS
~0 Gs
|
| 80 mm |
0.11 kg / 0.23 LBS
214 Gs
|
0.02 kg / 0.03 LBS
16 g / 0.2 N
|
0.10 kg / 0.21 LBS
~0 Gs
|
| 90 mm |
0.06 kg / 0.14 LBS
164 Gs
|
0.01 kg / 0.02 LBS
9 g / 0.1 N
|
0.06 kg / 0.12 LBS
~0 Gs
|
| 100 mm |
0.04 kg / 0.08 LBS
128 Gs
|
0.01 kg / 0.01 LBS
6 g / 0.1 N
|
0.03 kg / 0.07 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 50x30x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 8.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - warning
MPL 50x30x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
15.99 km/h
(4.44 m/s)
|
0.44 J | |
| 30 mm |
23.02 km/h
(6.39 m/s)
|
0.92 J | |
| 50 mm |
29.30 km/h
(8.14 m/s)
|
1.49 J | |
| 100 mm |
41.37 km/h
(11.49 m/s)
|
2.97 J |
Table 9: Corrosion resistance
MPL 50x30x4 / 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 (Flux)
MPL 50x30x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 22 399 Mx | 224.0 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 50x30x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 7.57 kg | Standard |
| Water (riverbed) |
8.67 kg
(+1.10 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Thermal stability
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14
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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Advantages as well as disadvantages of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- Magnets effectively resist against demagnetization caused by external fields,
- Thanks to the shiny finish, the plating of Ni-Cu-Ni, gold, or silver-plated gives an visually attractive appearance,
- Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of precise modeling as well as optimizing to concrete requirements,
- Key role in modern technologies – they serve a role in computer drives, electromotive mechanisms, diagnostic systems, as well as other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- They rust in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complicated forms in magnets, we propose using a housing - magnetic mechanism.
- Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Maximum lifting force for a neodymium magnet – what contributes to it?
- on a plate made of structural steel, effectively closing the magnetic flux
- with a cross-section of at least 10 mm
- with an polished touching surface
- without the slightest air gap between the magnet and steel
- under axial force vector (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Gap (betwixt the magnet and the metal), because even a very small distance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, corrosion or debris).
- Pull-off angle – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Wall 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.
- Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
- Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Danger to the youngest
Strictly store magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are life-threatening.
Warning for heart patients
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have electronic implants.
Magnet fragility
Despite the nickel coating, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Powerful field
Be careful. Neodymium magnets attract from a distance and connect with massive power, often faster than you can react.
Phone sensors
Note: neodymium magnets generate a field that confuses sensitive sensors. Keep a safe distance from your mobile, tablet, and navigation systems.
Pinching danger
Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, destroying anything in their path. Exercise extreme caution!
Thermal limits
Standard neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. This process is irreversible.
Fire warning
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Threat to electronics
Equipment safety: Strong magnets can ruin payment cards and sensitive devices (heart implants, medical aids, mechanical watches).
Nickel allergy
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation appears, cease handling magnets and use protective gear.
