MPL 50x50x25 / N38 - lamellar magnet
lamellar magnet
Catalog no 020168
GTIN/EAN: 5906301811749
length
50 mm [±0,1 mm]
Width
50 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
468.75 g
Magnetization Direction
↑ axial
Load capacity
90.53 kg / 888.15 N
Magnetic Induction
413.25 mT / 4133 Gs
Coating
[NiCuNi] Nickel
159.90 ZŁ with VAT / pcs + price for transport
130.00 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MPL 50x50x25 / N38 - lamellar magnet
Specification / characteristics - MPL 50x50x25 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020168 |
| GTIN/EAN | 5906301811749 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 50 mm [±0,1 mm] |
| Height | 25 mm [±0,1 mm] |
| Weight | 468.75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 90.53 kg / 888.15 N |
| Magnetic Induction ~ ? | 413.25 mT / 4133 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 modeling of the magnet - report
Presented data are the result of a physical simulation. Results rely on algorithms for the material Nd2Fe14B. Actual performance may deviate from the simulation results. Use these calculations as a supplementary guide during assembly planning.
Table 1: Static force (force vs distance) - interaction chart
MPL 50x50x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4132 Gs
413.2 mT
|
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
dangerous! |
| 1 mm |
3999 Gs
399.9 mT
|
84.79 kg / 186.94 LBS
84794.0 g / 831.8 N
|
dangerous! |
| 2 mm |
3861 Gs
386.1 mT
|
79.04 kg / 174.25 LBS
79038.6 g / 775.4 N
|
dangerous! |
| 3 mm |
3720 Gs
372.0 mT
|
73.38 kg / 161.78 LBS
73381.8 g / 719.9 N
|
dangerous! |
| 5 mm |
3435 Gs
343.5 mT
|
62.56 kg / 137.93 LBS
62564.2 g / 613.8 N
|
dangerous! |
| 10 mm |
2742 Gs
274.2 mT
|
39.87 kg / 87.90 LBS
39868.7 g / 391.1 N
|
dangerous! |
| 15 mm |
2137 Gs
213.7 mT
|
24.21 kg / 53.37 LBS
24210.4 g / 237.5 N
|
dangerous! |
| 20 mm |
1649 Gs
164.9 mT
|
14.41 kg / 31.77 LBS
14409.9 g / 141.4 N
|
dangerous! |
| 30 mm |
988 Gs
98.8 mT
|
5.17 kg / 11.40 LBS
5170.9 g / 50.7 N
|
warning |
| 50 mm |
399 Gs
39.9 mT
|
0.85 kg / 1.86 LBS
845.8 g / 8.3 N
|
low risk |
Table 2: Sliding load (wall)
MPL 50x50x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
|
| 1 mm | Stal (~0.2) |
16.96 kg / 37.39 LBS
16958.0 g / 166.4 N
|
| 2 mm | Stal (~0.2) |
15.81 kg / 34.85 LBS
15808.0 g / 155.1 N
|
| 3 mm | Stal (~0.2) |
14.68 kg / 32.36 LBS
14676.0 g / 144.0 N
|
| 5 mm | Stal (~0.2) |
12.51 kg / 27.58 LBS
12512.0 g / 122.7 N
|
| 10 mm | Stal (~0.2) |
7.97 kg / 17.58 LBS
7974.0 g / 78.2 N
|
| 15 mm | Stal (~0.2) |
4.84 kg / 10.67 LBS
4842.0 g / 47.5 N
|
| 20 mm | Stal (~0.2) |
2.88 kg / 6.35 LBS
2882.0 g / 28.3 N
|
| 30 mm | Stal (~0.2) |
1.03 kg / 2.28 LBS
1034.0 g / 10.1 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 50x50x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
27.16 kg / 59.88 LBS
27159.0 g / 266.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.05 kg / 19.96 LBS
9053.0 g / 88.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
45.27 kg / 99.79 LBS
45265.0 g / 444.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 50x50x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
3.02 kg / 6.65 LBS
3017.7 g / 29.6 N
|
| 1 mm |
|
7.54 kg / 16.63 LBS
7544.2 g / 74.0 N
|
| 2 mm |
|
15.09 kg / 33.26 LBS
15088.3 g / 148.0 N
|
| 3 mm |
|
22.63 kg / 49.90 LBS
22632.5 g / 222.0 N
|
| 5 mm |
|
37.72 kg / 83.16 LBS
37720.8 g / 370.0 N
|
| 10 mm |
|
75.44 kg / 166.32 LBS
75441.7 g / 740.1 N
|
| 11 mm |
|
82.99 kg / 182.95 LBS
82985.8 g / 814.1 N
|
| 12 mm |
|
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
Table 5: Working in heat (stability) - resistance threshold
MPL 50x50x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
OK |
| 40 °C | -2.2% |
88.54 kg / 195.19 LBS
88538.3 g / 868.6 N
|
OK |
| 60 °C | -4.4% |
86.55 kg / 190.80 LBS
86546.7 g / 849.0 N
|
|
| 80 °C | -6.6% |
84.56 kg / 186.41 LBS
84555.0 g / 829.5 N
|
|
| 100 °C | -28.8% |
64.46 kg / 142.10 LBS
64457.4 g / 632.3 N
|
Table 6: Two magnets (repulsion) - field collision
MPL 50x50x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
263.15 kg / 580.14 LBS
5 403 Gs
|
39.47 kg / 87.02 LBS
39472 g / 387.2 N
|
N/A |
| 1 mm |
254.89 kg / 561.94 LBS
8 133 Gs
|
38.23 kg / 84.29 LBS
38234 g / 375.1 N
|
229.40 kg / 505.75 LBS
~0 Gs
|
| 2 mm |
246.47 kg / 543.38 LBS
7 998 Gs
|
36.97 kg / 81.51 LBS
36971 g / 362.7 N
|
221.83 kg / 489.04 LBS
~0 Gs
|
| 3 mm |
238.08 kg / 524.88 LBS
7 861 Gs
|
35.71 kg / 78.73 LBS
35713 g / 350.3 N
|
214.28 kg / 472.40 LBS
~0 Gs
|
| 5 mm |
221.48 kg / 488.27 LBS
7 582 Gs
|
33.22 kg / 73.24 LBS
33222 g / 325.9 N
|
199.33 kg / 439.45 LBS
~0 Gs
|
| 10 mm |
181.86 kg / 400.93 LBS
6 870 Gs
|
27.28 kg / 60.14 LBS
27279 g / 267.6 N
|
163.67 kg / 360.83 LBS
~0 Gs
|
| 20 mm |
115.89 kg / 255.49 LBS
5 484 Gs
|
17.38 kg / 38.32 LBS
17383 g / 170.5 N
|
104.30 kg / 229.94 LBS
~0 Gs
|
| 50 mm |
24.93 kg / 54.97 LBS
2 544 Gs
|
3.74 kg / 8.25 LBS
3740 g / 36.7 N
|
22.44 kg / 49.47 LBS
~0 Gs
|
| 60 mm |
15.03 kg / 33.14 LBS
1 975 Gs
|
2.25 kg / 4.97 LBS
2255 g / 22.1 N
|
13.53 kg / 29.82 LBS
~0 Gs
|
| 70 mm |
9.24 kg / 20.37 LBS
1 548 Gs
|
1.39 kg / 3.05 LBS
1386 g / 13.6 N
|
8.31 kg / 18.33 LBS
~0 Gs
|
| 80 mm |
5.81 kg / 12.80 LBS
1 228 Gs
|
0.87 kg / 1.92 LBS
871 g / 8.5 N
|
5.23 kg / 11.52 LBS
~0 Gs
|
| 90 mm |
3.74 kg / 8.24 LBS
985 Gs
|
0.56 kg / 1.24 LBS
560 g / 5.5 N
|
3.36 kg / 7.41 LBS
~0 Gs
|
| 100 mm |
2.46 kg / 5.42 LBS
799 Gs
|
0.37 kg / 0.81 LBS
369 g / 3.6 N
|
2.21 kg / 4.88 LBS
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MPL 50x50x25 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 28.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 22.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 17.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 13.5 cm |
| Car key | 50 Gs (5.0 mT) | 12.5 cm |
| Payment card | 400 Gs (40.0 mT) | 5.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 4.5 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 50x50x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.45 km/h
(4.85 m/s)
|
5.51 J | |
| 30 mm |
25.13 km/h
(6.98 m/s)
|
11.42 J | |
| 50 mm |
31.52 km/h
(8.76 m/s)
|
17.97 J | |
| 100 mm |
44.33 km/h
(12.31 m/s)
|
35.54 J |
Table 9: Coating parameters (durability)
MPL 50x50x25 / 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 (Flux)
MPL 50x50x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 105 093 Mx | 1050.9 µWb |
| Pc Coefficient | 0.54 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 50x50x25 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 90.53 kg | Standard |
| Water (riverbed) |
103.66 kg
(+13.13 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical wall, the magnet holds just ~20% of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Thermal stability
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54
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 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Benefits
- They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (based on calculations),
- They feature excellent resistance to magnetic field loss as a result of external magnetic sources,
- By applying a reflective coating of nickel, the element presents an aesthetic look,
- The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
- 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...
- Thanks to versatility in constructing and the ability to adapt to individual projects,
- Key role in future technologies – they serve a role in computer drives, electric motors, advanced medical instruments, as well as industrial machines.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose their strength 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in creating nuts and complicated forms in magnets, we recommend using cover - magnetic holder.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child safety. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what affects it?
- using a base made of mild steel, serving as a magnetic yoke
- with a thickness of at least 10 mm
- with a surface perfectly flat
- without the slightest insulating layer between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- at standard ambient temperature
Lifting capacity in practice – influencing factors
- Air gap (betwixt the magnet and the plate), as even a very small distance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to varnish, rust or debris).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the nominal value.
- Metal 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.
- Material type – the best choice is pure iron steel. Stainless steels may generate lower lifting capacity.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.
Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap between the magnet and the plate reduces the lifting capacity.
Precautions when working with NdFeB magnets
Fragile material
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into sharp, dangerous pieces.
Crushing risk
Risk of injury: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Use thick gloves.
Handling guide
Be careful. Neodymium magnets act from a distance and connect with huge force, often faster than you can react.
Do not overheat magnets
Keep cool. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Life threat
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have medical devices.
Nickel allergy
Nickel alert: The Ni-Cu-Ni coating contains nickel. If redness appears, cease handling magnets and use protective gear.
GPS and phone interference
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the internal compass in your phone.
Product not for children
Strictly store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are life-threatening.
Threat to electronics
Data protection: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, hearing aids, timepieces).
Fire risk
Fire hazard: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.
