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
bulk discounts:
Need more?
Call us now
+48 888 99 98 98
otherwise drop us a message through
contact form
through our site.
Specifications and appearance of magnetic components can be tested with our
power calculator.
Order by 14:00 and we’ll ship today!
Detailed specification - 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 |
Engineering analysis of the product - technical parameters
Presented data are the direct effect of a mathematical analysis. Results are based on algorithms for the class Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these calculations as a reference point when designing systems.
Table 1: Static pull force (pull vs gap) - 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 pounds
37120.0 g / 364.1 N
|
crushing |
| 1 mm |
3234 Gs
323.4 mT
|
33.50 kg / 73.86 pounds
33501.5 g / 328.6 N
|
crushing |
| 2 mm |
3052 Gs
305.2 mT
|
29.85 kg / 65.80 pounds
29847.1 g / 292.8 N
|
crushing |
| 3 mm |
2866 Gs
286.6 mT
|
26.32 kg / 58.02 pounds
26317.3 g / 258.2 N
|
crushing |
| 5 mm |
2496 Gs
249.6 mT
|
19.97 kg / 44.02 pounds
19965.4 g / 195.9 N
|
crushing |
| 10 mm |
1702 Gs
170.2 mT
|
9.28 kg / 20.45 pounds
9278.2 g / 91.0 N
|
strong |
| 15 mm |
1151 Gs
115.1 mT
|
4.25 kg / 9.36 pounds
4246.0 g / 41.7 N
|
strong |
| 20 mm |
792 Gs
79.2 mT
|
2.01 kg / 4.44 pounds
2012.1 g / 19.7 N
|
strong |
| 30 mm |
404 Gs
40.4 mT
|
0.52 kg / 1.15 pounds
523.0 g / 5.1 N
|
safe |
| 50 mm |
137 Gs
13.7 mT
|
0.06 kg / 0.13 pounds
60.1 g / 0.6 N
|
safe |
Table 2: Slippage capacity (wall)
MPL 50x25x12 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
|
| 1 mm | Stal (~0.2) |
6.70 kg / 14.77 pounds
6700.0 g / 65.7 N
|
| 2 mm | Stal (~0.2) |
5.97 kg / 13.16 pounds
5970.0 g / 58.6 N
|
| 3 mm | Stal (~0.2) |
5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
|
| 5 mm | Stal (~0.2) |
3.99 kg / 8.81 pounds
3994.0 g / 39.2 N
|
| 10 mm | Stal (~0.2) |
1.86 kg / 4.09 pounds
1856.0 g / 18.2 N
|
| 15 mm | Stal (~0.2) |
0.85 kg / 1.87 pounds
850.0 g / 8.3 N
|
| 20 mm | Stal (~0.2) |
0.40 kg / 0.89 pounds
402.0 g / 3.9 N
|
| 30 mm | Stal (~0.2) |
0.10 kg / 0.23 pounds
104.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
Table 3: Wall mounting (sliding) - 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 pounds
11136.0 g / 109.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
7.42 kg / 16.37 pounds
7424.0 g / 72.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.71 kg / 8.18 pounds
3712.0 g / 36.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
18.56 kg / 40.92 pounds
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 pounds
1856.0 g / 18.2 N
|
| 1 mm |
|
4.64 kg / 10.23 pounds
4640.0 g / 45.5 N
|
| 2 mm |
|
9.28 kg / 20.46 pounds
9280.0 g / 91.0 N
|
| 3 mm |
|
13.92 kg / 30.69 pounds
13920.0 g / 136.6 N
|
| 5 mm |
|
23.20 kg / 51.15 pounds
23200.0 g / 227.6 N
|
| 10 mm |
|
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
|
| 11 mm |
|
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
|
| 12 mm |
|
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 50x25x12 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
37.12 kg / 81.84 pounds
37120.0 g / 364.1 N
|
OK |
| 40 °C | -2.2% |
36.30 kg / 80.04 pounds
36303.4 g / 356.1 N
|
OK |
| 60 °C | -4.4% |
35.49 kg / 78.23 pounds
35486.7 g / 348.1 N
|
|
| 80 °C | -6.6% |
34.67 kg / 76.43 pounds
34670.1 g / 340.1 N
|
|
| 100 °C | -28.8% |
26.43 kg / 58.27 pounds
26429.4 g / 259.3 N
|
Table 6: Two magnets (attraction) - field collision
MPL 50x25x12 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
89.28 kg / 196.82 pounds
4 856 Gs
|
13.39 kg / 29.52 pounds
13392 g / 131.4 N
|
N/A |
| 1 mm |
84.99 kg / 187.37 pounds
6 642 Gs
|
12.75 kg / 28.11 pounds
12749 g / 125.1 N
|
76.49 kg / 168.63 pounds
~0 Gs
|
| 2 mm |
80.57 kg / 177.64 pounds
6 467 Gs
|
12.09 kg / 26.65 pounds
12086 g / 118.6 N
|
72.52 kg / 159.87 pounds
~0 Gs
|
| 3 mm |
76.16 kg / 167.90 pounds
6 287 Gs
|
11.42 kg / 25.19 pounds
11424 g / 112.1 N
|
68.54 kg / 151.11 pounds
~0 Gs
|
| 5 mm |
67.49 kg / 148.78 pounds
5 919 Gs
|
10.12 kg / 22.32 pounds
10123 g / 99.3 N
|
60.74 kg / 133.91 pounds
~0 Gs
|
| 10 mm |
48.02 kg / 105.86 pounds
4 992 Gs
|
7.20 kg / 15.88 pounds
7203 g / 70.7 N
|
43.22 kg / 95.28 pounds
~0 Gs
|
| 20 mm |
22.32 kg / 49.20 pounds
3 403 Gs
|
3.35 kg / 7.38 pounds
3347 g / 32.8 N
|
20.08 kg / 44.28 pounds
~0 Gs
|
| 50 mm |
2.41 kg / 5.31 pounds
1 118 Gs
|
0.36 kg / 0.80 pounds
361 g / 3.5 N
|
2.17 kg / 4.78 pounds
~0 Gs
|
| 60 mm |
1.26 kg / 2.77 pounds
808 Gs
|
0.19 kg / 0.42 pounds
189 g / 1.9 N
|
1.13 kg / 2.50 pounds
~0 Gs
|
| 70 mm |
0.69 kg / 1.52 pounds
598 Gs
|
0.10 kg / 0.23 pounds
103 g / 1.0 N
|
0.62 kg / 1.37 pounds
~0 Gs
|
| 80 mm |
0.39 kg / 0.87 pounds
452 Gs
|
0.06 kg / 0.13 pounds
59 g / 0.6 N
|
0.35 kg / 0.78 pounds
~0 Gs
|
| 90 mm |
0.23 kg / 0.52 pounds
349 Gs
|
0.04 kg / 0.08 pounds
35 g / 0.3 N
|
0.21 kg / 0.47 pounds
~0 Gs
|
| 100 mm |
0.14 kg / 0.32 pounds
274 Gs
|
0.02 kg / 0.05 pounds
22 g / 0.2 N
|
0.13 kg / 0.29 pounds
~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 |
| Mechanical watch | 20 Gs (2.0 mT) | 11.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 8.5 cm |
| Car key | 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: Anti-corrosion coating 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: Electrical data (Flux)
MPL 50x25x12 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 42 945 Mx | 429.5 µWb |
| Pc Coefficient | 0.40 | Low (Flat) |
Table 11: Submerged application
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. Sliding resistance
*Caution: On a vertical surface, the magnet retains only approx. 20-30% of its nominal pull.
2. Efficiency vs thickness
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Heat tolerance
*For N38 grade, the critical limit 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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros and cons of Nd2Fe14B magnets.
Benefits
- They have constant strength, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
- They have excellent resistance to weakening of magnetic properties due to external magnetic sources,
- A magnet with a shiny silver surface looks better,
- Magnets have extremely high magnetic induction on the outer side,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
- Considering the option of free shaping and customization to unique projects, neodymium magnets can be created in a broad palette of forms and dimensions, which expands the range of possible applications,
- Significant place in advanced technology sectors – they are commonly used in hard drives, drive modules, diagnostic systems, also modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices
Weaknesses
- Brittleness is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
- When exposed to high temperature, neodymium magnets suffer 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
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Due to limitations in realizing threads and complex forms in magnets, we propose using casing - magnetic mount.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Detachment force of the magnet in optimal conditions – what affects it?
- on a base made of structural steel, effectively closing the magnetic field
- with a cross-section of at least 10 mm
- with an polished touching surface
- under conditions of ideal adhesion (surface-to-surface)
- for force acting at a right angle (in the magnet axis)
- at temperature approx. 20 degrees Celsius
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – insufficiently thick sheet does not close the flux, causing part of the power to be lost to the other side.
- Steel grade – the best choice is high-permeability steel. Cast iron may attract less.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Rough surfaces weaken the grip.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate reduces the load capacity.
Safety rules for work with NdFeB magnets
Permanent damage
Monitor thermal conditions. Exposing the magnet to high heat will ruin its magnetic structure and pulling force.
Allergy Warning
Allergy Notice: The nickel-copper-nickel coating contains nickel. If redness occurs, cease handling magnets and wear gloves.
Data carriers
Device Safety: Neodymium magnets can damage data carriers and sensitive devices (heart implants, hearing aids, mechanical watches).
Crushing force
Danger of trauma: The pulling power is so great that it can cause blood blisters, pinching, and broken bones. Use thick gloves.
Choking Hazard
Strictly store magnets away from children. Ingestion danger is high, and the consequences of magnets clamping inside the body are very dangerous.
Powerful field
Exercise caution. Rare earth magnets attract from a distance and connect with huge force, often quicker than you can react.
Medical implants
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Machining danger
Machining of neodymium magnets poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Phone sensors
Remember: rare earth magnets generate a field that confuses precision electronics. Maintain a separation from your phone, tablet, and GPS.
Fragile material
Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
