MPL 50x20x20 / N38 - lamellar magnet
lamellar magnet
Catalog no 020166
GTIN/EAN: 5906301811725
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
150 g
Magnetization Direction
↑ axial
Load capacity
42.18 kg / 413.81 N
Magnetic Induction
478.99 mT / 4790 Gs
Coating
[NiCuNi] Nickel
47.32 ZŁ with VAT / pcs + price for transport
38.47 ZŁ net + 23% VAT / pcs
bulk discounts:
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Detailed specification - MPL 50x20x20 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x20 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020166 |
| GTIN/EAN | 5906301811725 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 20 mm [±0,1 mm] |
| Weight | 150 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 42.18 kg / 413.81 N |
| Magnetic Induction ~ ? | 478.99 mT / 4790 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 |
Physical simulation of the product - technical parameters
These data are the result of a physical simulation. Values rely on algorithms for the material Nd2Fe14B. Operational performance might slightly deviate from the simulation results. Please consider these calculations as a reference point for designers.
Table 1: Static pull force (pull vs gap) - characteristics
MPL 50x20x20 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4789 Gs
478.9 mT
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
crushing |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 LBS
36461.5 g / 357.7 N
|
crushing |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 LBS
31126.5 g / 305.4 N
|
crushing |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 LBS
26336.3 g / 258.4 N
|
crushing |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 LBS
18523.4 g / 181.7 N
|
crushing |
| 10 mm |
2022 Gs
202.2 mT
|
7.52 kg / 16.59 LBS
7522.9 g / 73.8 N
|
medium risk |
| 15 mm |
1324 Gs
132.4 mT
|
3.22 kg / 7.10 LBS
3222.6 g / 31.6 N
|
medium risk |
| 20 mm |
899 Gs
89.9 mT
|
1.49 kg / 3.28 LBS
1487.5 g / 14.6 N
|
low risk |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 LBS
385.8 g / 3.8 N
|
low risk |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 LBS
46.4 g / 0.5 N
|
low risk |
Table 2: Shear force (wall)
MPL 50x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| 1 mm | Stal (~0.2) |
7.29 kg / 16.08 LBS
7292.0 g / 71.5 N
|
| 2 mm | Stal (~0.2) |
6.23 kg / 13.73 LBS
6226.0 g / 61.1 N
|
| 3 mm | Stal (~0.2) |
5.27 kg / 11.61 LBS
5268.0 g / 51.7 N
|
| 5 mm | Stal (~0.2) |
3.70 kg / 8.17 LBS
3704.0 g / 36.3 N
|
| 10 mm | Stal (~0.2) |
1.50 kg / 3.32 LBS
1504.0 g / 14.8 N
|
| 15 mm | Stal (~0.2) |
0.64 kg / 1.42 LBS
644.0 g / 6.3 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 LBS
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.08 kg / 0.17 LBS
78.0 g / 0.8 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 50x20x20 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
12.65 kg / 27.90 LBS
12654.0 g / 124.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.44 kg / 18.60 LBS
8436.0 g / 82.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.22 kg / 9.30 LBS
4218.0 g / 41.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.09 kg / 46.50 LBS
21090.0 g / 206.9 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 50x20x20 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
2.11 kg / 4.65 LBS
2109.0 g / 20.7 N
|
| 1 mm |
|
5.27 kg / 11.62 LBS
5272.5 g / 51.7 N
|
| 2 mm |
|
10.55 kg / 23.25 LBS
10545.0 g / 103.4 N
|
| 3 mm |
|
15.82 kg / 34.87 LBS
15817.5 g / 155.2 N
|
| 5 mm |
|
26.36 kg / 58.12 LBS
26362.5 g / 258.6 N
|
| 10 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 11 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
| 12 mm |
|
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 50x20x20 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
42.18 kg / 92.99 LBS
42180.0 g / 413.8 N
|
OK |
| 40 °C | -2.2% |
41.25 kg / 90.95 LBS
41252.0 g / 404.7 N
|
OK |
| 60 °C | -4.4% |
40.32 kg / 88.90 LBS
40324.1 g / 395.6 N
|
OK |
| 80 °C | -6.6% |
39.40 kg / 86.85 LBS
39396.1 g / 386.5 N
|
|
| 100 °C | -28.8% |
30.03 kg / 66.21 LBS
30032.2 g / 294.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 50x20x20 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
141.37 kg / 311.66 LBS
5 687 Gs
|
21.21 kg / 46.75 LBS
21205 g / 208.0 N
|
N/A |
| 1 mm |
131.73 kg / 290.41 LBS
9 245 Gs
|
19.76 kg / 43.56 LBS
19759 g / 193.8 N
|
118.55 kg / 261.37 LBS
~0 Gs
|
| 2 mm |
122.20 kg / 269.41 LBS
8 904 Gs
|
18.33 kg / 40.41 LBS
18330 g / 179.8 N
|
109.98 kg / 242.47 LBS
~0 Gs
|
| 3 mm |
113.05 kg / 249.23 LBS
8 564 Gs
|
16.96 kg / 37.38 LBS
16957 g / 166.4 N
|
101.74 kg / 224.31 LBS
~0 Gs
|
| 5 mm |
96.05 kg / 211.76 LBS
7 894 Gs
|
14.41 kg / 31.76 LBS
14408 g / 141.3 N
|
86.45 kg / 190.58 LBS
~0 Gs
|
| 10 mm |
62.08 kg / 136.87 LBS
6 347 Gs
|
9.31 kg / 20.53 LBS
9312 g / 91.4 N
|
55.87 kg / 123.18 LBS
~0 Gs
|
| 20 mm |
25.21 kg / 55.59 LBS
4 045 Gs
|
3.78 kg / 8.34 LBS
3782 g / 37.1 N
|
22.69 kg / 50.03 LBS
~0 Gs
|
| 50 mm |
2.46 kg / 5.43 LBS
1 264 Gs
|
0.37 kg / 0.81 LBS
370 g / 3.6 N
|
2.22 kg / 4.89 LBS
~0 Gs
|
| 60 mm |
1.29 kg / 2.85 LBS
916 Gs
|
0.19 kg / 0.43 LBS
194 g / 1.9 N
|
1.16 kg / 2.57 LBS
~0 Gs
|
| 70 mm |
0.71 kg / 1.58 LBS
681 Gs
|
0.11 kg / 0.24 LBS
107 g / 1.1 N
|
0.64 kg / 1.42 LBS
~0 Gs
|
| 80 mm |
0.41 kg / 0.91 LBS
518 Gs
|
0.06 kg / 0.14 LBS
62 g / 0.6 N
|
0.37 kg / 0.82 LBS
~0 Gs
|
| 90 mm |
0.25 kg / 0.55 LBS
402 Gs
|
0.04 kg / 0.08 LBS
37 g / 0.4 N
|
0.22 kg / 0.49 LBS
~0 Gs
|
| 100 mm |
0.16 kg / 0.34 LBS
318 Gs
|
0.02 kg / 0.05 LBS
23 g / 0.2 N
|
0.14 kg / 0.31 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - warnings
MPL 50x20x20 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 19.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 15.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 11.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 9.0 cm |
| Car key | 50 Gs (5.0 mT) | 8.5 cm |
| Payment card | 400 Gs (40.0 mT) | 3.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 3.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 50x20x20 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.70 km/h
(5.20 m/s)
|
2.02 J | |
| 30 mm |
29.46 km/h
(8.18 m/s)
|
5.02 J | |
| 50 mm |
37.84 km/h
(10.51 m/s)
|
8.29 J | |
| 100 mm |
53.48 km/h
(14.86 m/s)
|
16.55 J |
Table 9: Surface protection spec
MPL 50x20x20 / 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 50x20x20 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 46 654 Mx | 466.5 µWb |
| Pc Coefficient | 0.63 | High (Stable) |
Table 11: Physics of underwater searching
MPL 50x20x20 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 42.18 kg | Standard |
| Water (riverbed) |
48.30 kg
(+6.12 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical surface, the magnet retains merely a fraction of its nominal pull.
2. Plate thickness effect
*Thin steel (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*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) = 0.63
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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Pros and cons of rare earth magnets.
Pros
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They maintain their magnetic properties even under strong external field,
- Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an clean appearance,
- Magnetic induction on the working part of the magnet remains very high,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of exact modeling as well as modifying to complex applications,
- Wide application in advanced technology sectors – they are utilized in mass storage devices, brushless drives, medical equipment, as well as industrial machines.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Limitations
- At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- Neodymium magnets lose their power 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
- When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- We suggest a housing - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complicated forms.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the context of child safety. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Maximum lifting capacity of the magnet – what it depends on?
- with the use of a yoke made of special test steel, ensuring full magnetic saturation
- whose thickness is min. 10 mm
- with a plane cleaned and smooth
- with zero gap (no coatings)
- under vertical application of breakaway force (90-degree angle)
- in neutral thermal conditions
Magnet lifting force in use – key factors
- Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) significantly weakens the pulling force, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
- Material type – the best choice is high-permeability steel. Stainless steels may have worse magnetic properties.
- Smoothness – full contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal environment – temperature increase results in weakening of force. Check the thermal limit for a given model.
Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Safe handling of neodymium magnets
Keep away from electronics
Be aware: neodymium magnets produce a field that disrupts precision electronics. Keep a safe distance from your phone, device, and GPS.
Keep away from children
Neodymium magnets are not suitable for play. Swallowing multiple magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.
Finger safety
Watch your fingers. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Magnets are brittle
Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Dust is flammable
Fire warning: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Handling rules
Use magnets consciously. Their powerful strength can shock even professionals. Be vigilant and respect their power.
Magnetic media
Powerful magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Keep a distance of at least 10 cm.
Pacemakers
Medical warning: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Maximum temperature
Control the heat. Heating the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
Nickel coating and allergies
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation occurs, immediately stop working with magnets and use protective gear.
