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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Technical of the product - 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 modeling of the product - report
The following data are the result of a engineering simulation. Results are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Please consider these data as a reference point when designing systems.
Table 1: Static pull force (pull vs gap) - power drop
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 pounds
42180.0 g / 413.8 N
|
crushing |
| 1 mm |
4452 Gs
445.2 mT
|
36.46 kg / 80.38 pounds
36461.5 g / 357.7 N
|
crushing |
| 2 mm |
4114 Gs
411.4 mT
|
31.13 kg / 68.62 pounds
31126.5 g / 305.4 N
|
crushing |
| 3 mm |
3784 Gs
378.4 mT
|
26.34 kg / 58.06 pounds
26336.3 g / 258.4 N
|
crushing |
| 5 mm |
3173 Gs
317.3 mT
|
18.52 kg / 40.84 pounds
18523.4 g / 181.7 N
|
crushing |
| 10 mm |
2022 Gs
202.2 mT
|
7.52 kg / 16.59 pounds
7522.9 g / 73.8 N
|
medium risk |
| 15 mm |
1324 Gs
132.4 mT
|
3.22 kg / 7.10 pounds
3222.6 g / 31.6 N
|
medium risk |
| 20 mm |
899 Gs
89.9 mT
|
1.49 kg / 3.28 pounds
1487.5 g / 14.6 N
|
low risk |
| 30 mm |
458 Gs
45.8 mT
|
0.39 kg / 0.85 pounds
385.8 g / 3.8 N
|
low risk |
| 50 mm |
159 Gs
15.9 mT
|
0.05 kg / 0.10 pounds
46.4 g / 0.5 N
|
low risk |
Table 2: Slippage load (wall)
MPL 50x20x20 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
|
| 1 mm | Stal (~0.2) |
7.29 kg / 16.08 pounds
7292.0 g / 71.5 N
|
| 2 mm | Stal (~0.2) |
6.23 kg / 13.73 pounds
6226.0 g / 61.1 N
|
| 3 mm | Stal (~0.2) |
5.27 kg / 11.61 pounds
5268.0 g / 51.7 N
|
| 5 mm | Stal (~0.2) |
3.70 kg / 8.17 pounds
3704.0 g / 36.3 N
|
| 10 mm | Stal (~0.2) |
1.50 kg / 3.32 pounds
1504.0 g / 14.8 N
|
| 15 mm | Stal (~0.2) |
0.64 kg / 1.42 pounds
644.0 g / 6.3 N
|
| 20 mm | Stal (~0.2) |
0.30 kg / 0.66 pounds
298.0 g / 2.9 N
|
| 30 mm | Stal (~0.2) |
0.08 kg / 0.17 pounds
78.0 g / 0.8 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 g / 0.1 N
|
Table 3: Wall mounting (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 pounds
12654.0 g / 124.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
8.44 kg / 18.60 pounds
8436.0 g / 82.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
4.22 kg / 9.30 pounds
4218.0 g / 41.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
21.09 kg / 46.50 pounds
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 pounds
2109.0 g / 20.7 N
|
| 1 mm |
|
5.27 kg / 11.62 pounds
5272.5 g / 51.7 N
|
| 2 mm |
|
10.55 kg / 23.25 pounds
10545.0 g / 103.4 N
|
| 3 mm |
|
15.82 kg / 34.87 pounds
15817.5 g / 155.2 N
|
| 5 mm |
|
26.36 kg / 58.12 pounds
26362.5 g / 258.6 N
|
| 10 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
| 11 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
| 12 mm |
|
42.18 kg / 92.99 pounds
42180.0 g / 413.8 N
|
Table 5: Working in heat (stability) - 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 pounds
42180.0 g / 413.8 N
|
OK |
| 40 °C | -2.2% |
41.25 kg / 90.95 pounds
41252.0 g / 404.7 N
|
OK |
| 60 °C | -4.4% |
40.32 kg / 88.90 pounds
40324.1 g / 395.6 N
|
OK |
| 80 °C | -6.6% |
39.40 kg / 86.85 pounds
39396.1 g / 386.5 N
|
|
| 100 °C | -28.8% |
30.03 kg / 66.21 pounds
30032.2 g / 294.6 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
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 pounds
5 687 Gs
|
21.21 kg / 46.75 pounds
21205 g / 208.0 N
|
N/A |
| 1 mm |
131.73 kg / 290.41 pounds
9 245 Gs
|
19.76 kg / 43.56 pounds
19759 g / 193.8 N
|
118.55 kg / 261.37 pounds
~0 Gs
|
| 2 mm |
122.20 kg / 269.41 pounds
8 904 Gs
|
18.33 kg / 40.41 pounds
18330 g / 179.8 N
|
109.98 kg / 242.47 pounds
~0 Gs
|
| 3 mm |
113.05 kg / 249.23 pounds
8 564 Gs
|
16.96 kg / 37.38 pounds
16957 g / 166.4 N
|
101.74 kg / 224.31 pounds
~0 Gs
|
| 5 mm |
96.05 kg / 211.76 pounds
7 894 Gs
|
14.41 kg / 31.76 pounds
14408 g / 141.3 N
|
86.45 kg / 190.58 pounds
~0 Gs
|
| 10 mm |
62.08 kg / 136.87 pounds
6 347 Gs
|
9.31 kg / 20.53 pounds
9312 g / 91.4 N
|
55.87 kg / 123.18 pounds
~0 Gs
|
| 20 mm |
25.21 kg / 55.59 pounds
4 045 Gs
|
3.78 kg / 8.34 pounds
3782 g / 37.1 N
|
22.69 kg / 50.03 pounds
~0 Gs
|
| 50 mm |
2.46 kg / 5.43 pounds
1 264 Gs
|
0.37 kg / 0.81 pounds
370 g / 3.6 N
|
2.22 kg / 4.89 pounds
~0 Gs
|
| 60 mm |
1.29 kg / 2.85 pounds
916 Gs
|
0.19 kg / 0.43 pounds
194 g / 1.9 N
|
1.16 kg / 2.57 pounds
~0 Gs
|
| 70 mm |
0.71 kg / 1.58 pounds
681 Gs
|
0.11 kg / 0.24 pounds
107 g / 1.1 N
|
0.64 kg / 1.42 pounds
~0 Gs
|
| 80 mm |
0.41 kg / 0.91 pounds
518 Gs
|
0.06 kg / 0.14 pounds
62 g / 0.6 N
|
0.37 kg / 0.82 pounds
~0 Gs
|
| 90 mm |
0.25 kg / 0.55 pounds
402 Gs
|
0.04 kg / 0.08 pounds
37 g / 0.4 N
|
0.22 kg / 0.49 pounds
~0 Gs
|
| 100 mm |
0.16 kg / 0.34 pounds
318 Gs
|
0.02 kg / 0.05 pounds
23 g / 0.2 N
|
0.14 kg / 0.31 pounds
~0 Gs
|
Table 7: Safety (HSE) (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 |
| Timepiece | 20 Gs (2.0 mT) | 11.5 cm |
| Phone / Smartphone | 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: Dynamics (cracking risk) - collision effects
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: Anti-corrosion coating durability
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: Underwater work (magnet fishing)
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. Shear force
*Note: On a vertical wall, the magnet retains merely ~20% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.
3. Thermal stability
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.63
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Advantages and disadvantages of rare earth magnets.
Pros
- They retain attractive force for around 10 years – the loss is just ~1% (according to analyses),
- They possess excellent resistance to magnetism drop due to external magnetic sources,
- In other words, due to the aesthetic finish of silver, the element becomes visually attractive,
- Neodymium magnets create maximum magnetic induction on a small area, which ensures high operational effectiveness,
- 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...
- Due to the possibility of flexible shaping and adaptation to individualized solutions, neodymium magnets can be produced in a broad palette of forms and dimensions, which increases their versatility,
- Wide application in advanced technology sectors – they find application in mass storage devices, drive modules, diagnostic systems, as well as other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex shapes in magnets, we recommend using a housing - magnetic mount.
- Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. Additionally, tiny parts of these devices are able to complicate diagnosis medical when they are in the body.
- Due to complex production process, their price is relatively high,
Lifting parameters
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
- possessing a thickness of minimum 10 mm to ensure full flux closure
- with an ground touching surface
- without any clearance between the magnet and steel
- during pulling in a direction vertical to the mounting surface
- in neutral thermal conditions
Determinants of practical lifting force of a magnet
- Clearance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the maximum value.
- Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be escaped into the air.
- Chemical composition of the base – low-carbon steel gives the best results. Higher carbon content lower magnetic properties and holding force.
- Smoothness – full contact is obtained only on polished steel. Rough texture create air cushions, reducing force.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the lifting capacity is smaller. In addition, even a slight gap between the magnet and the plate lowers the lifting capacity.
Safety rules for work with NdFeB magnets
Operating temperature
Standard neodymium magnets (grade N) lose power when the temperature goes above 80°C. The loss of strength is permanent.
Bodily injuries
Mind your fingers. Two powerful magnets will join immediately with a force of massive weight, crushing everything in their path. Be careful!
Nickel coating and allergies
Some people suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause dermatitis. We strongly advise use safety gloves.
Threat to navigation
Navigation devices and smartphones are extremely susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Protective goggles
Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.
Danger to pacemakers
Medical warning: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have medical devices.
Product not for children
Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep away from children and animals.
Keep away from computers
Intense magnetic fields can erase data on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.
Immense force
Be careful. Rare earth magnets act from a long distance and snap with huge force, often faster than you can move away.
Fire warning
Fire warning: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
