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
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Technical - 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 simulation of the assembly - technical parameters
Presented information represent the result of a mathematical calculation. Results rely on models for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs distance) - characteristics
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 LBS
37120.0 g / 364.1 N
|
critical level |
| 1 mm |
3234 Gs
323.4 mT
|
33.50 kg / 73.86 LBS
33501.5 g / 328.6 N
|
critical level |
| 2 mm |
3052 Gs
305.2 mT
|
29.85 kg / 65.80 LBS
29847.1 g / 292.8 N
|
critical level |
| 3 mm |
2866 Gs
286.6 mT
|
26.32 kg / 58.02 LBS
26317.3 g / 258.2 N
|
critical level |
| 5 mm |
2496 Gs
249.6 mT
|
19.97 kg / 44.02 LBS
19965.4 g / 195.9 N
|
critical level |
| 10 mm |
1702 Gs
170.2 mT
|
9.28 kg / 20.45 LBS
9278.2 g / 91.0 N
|
strong |
| 15 mm |
1151 Gs
115.1 mT
|
4.25 kg / 9.36 LBS
4246.0 g / 41.7 N
|
strong |
| 20 mm |
792 Gs
79.2 mT
|
2.01 kg / 4.44 LBS
2012.1 g / 19.7 N
|
strong |
| 30 mm |
404 Gs
40.4 mT
|
0.52 kg / 1.15 LBS
523.0 g / 5.1 N
|
safe |
| 50 mm |
137 Gs
13.7 mT
|
0.06 kg / 0.13 LBS
60.1 g / 0.6 N
|
safe |
Table 2: Shear load (vertical surface)
MPL 50x25x12 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
7.42 kg / 16.37 LBS
7424.0 g / 72.8 N
|
| 1 mm | Stal (~0.2) |
6.70 kg / 14.77 LBS
6700.0 g / 65.7 N
|
| 2 mm | Stal (~0.2) |
5.97 kg / 13.16 LBS
5970.0 g / 58.6 N
|
| 3 mm | Stal (~0.2) |
5.26 kg / 11.61 LBS
5264.0 g / 51.6 N
|
| 5 mm | Stal (~0.2) |
3.99 kg / 8.81 LBS
3994.0 g / 39.2 N
|
| 10 mm | Stal (~0.2) |
1.86 kg / 4.09 LBS
1856.0 g / 18.2 N
|
| 15 mm | Stal (~0.2) |
0.85 kg / 1.87 LBS
850.0 g / 8.3 N
|
| 20 mm | Stal (~0.2) |
0.40 kg / 0.89 LBS
402.0 g / 3.9 N
|
| 30 mm | Stal (~0.2) |
0.10 kg / 0.23 LBS
104.0 g / 1.0 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.03 LBS
12.0 g / 0.1 N
|
Table 3: Vertical assembly (shearing) - vertical pull
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 LBS
11136.0 g / 109.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
7.42 kg / 16.37 LBS
7424.0 g / 72.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.71 kg / 8.18 LBS
3712.0 g / 36.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
18.56 kg / 40.92 LBS
18560.0 g / 182.1 N
|
Table 4: Material efficiency (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 LBS
1856.0 g / 18.2 N
|
| 1 mm |
|
4.64 kg / 10.23 LBS
4640.0 g / 45.5 N
|
| 2 mm |
|
9.28 kg / 20.46 LBS
9280.0 g / 91.0 N
|
| 3 mm |
|
13.92 kg / 30.69 LBS
13920.0 g / 136.6 N
|
| 5 mm |
|
23.20 kg / 51.15 LBS
23200.0 g / 227.6 N
|
| 10 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
| 11 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
| 12 mm |
|
37.12 kg / 81.84 LBS
37120.0 g / 364.1 N
|
Table 5: Working in heat (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 LBS
37120.0 g / 364.1 N
|
OK |
| 40 °C | -2.2% |
36.30 kg / 80.04 LBS
36303.4 g / 356.1 N
|
OK |
| 60 °C | -4.4% |
35.49 kg / 78.23 LBS
35486.7 g / 348.1 N
|
|
| 80 °C | -6.6% |
34.67 kg / 76.43 LBS
34670.1 g / 340.1 N
|
|
| 100 °C | -28.8% |
26.43 kg / 58.27 LBS
26429.4 g / 259.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - 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 LBS
4 856 Gs
|
13.39 kg / 29.52 LBS
13392 g / 131.4 N
|
N/A |
| 1 mm |
84.99 kg / 187.37 LBS
6 642 Gs
|
12.75 kg / 28.11 LBS
12749 g / 125.1 N
|
76.49 kg / 168.63 LBS
~0 Gs
|
| 2 mm |
80.57 kg / 177.64 LBS
6 467 Gs
|
12.09 kg / 26.65 LBS
12086 g / 118.6 N
|
72.52 kg / 159.87 LBS
~0 Gs
|
| 3 mm |
76.16 kg / 167.90 LBS
6 287 Gs
|
11.42 kg / 25.19 LBS
11424 g / 112.1 N
|
68.54 kg / 151.11 LBS
~0 Gs
|
| 5 mm |
67.49 kg / 148.78 LBS
5 919 Gs
|
10.12 kg / 22.32 LBS
10123 g / 99.3 N
|
60.74 kg / 133.91 LBS
~0 Gs
|
| 10 mm |
48.02 kg / 105.86 LBS
4 992 Gs
|
7.20 kg / 15.88 LBS
7203 g / 70.7 N
|
43.22 kg / 95.28 LBS
~0 Gs
|
| 20 mm |
22.32 kg / 49.20 LBS
3 403 Gs
|
3.35 kg / 7.38 LBS
3347 g / 32.8 N
|
20.08 kg / 44.28 LBS
~0 Gs
|
| 50 mm |
2.41 kg / 5.31 LBS
1 118 Gs
|
0.36 kg / 0.80 LBS
361 g / 3.5 N
|
2.17 kg / 4.78 LBS
~0 Gs
|
| 60 mm |
1.26 kg / 2.77 LBS
808 Gs
|
0.19 kg / 0.42 LBS
189 g / 1.9 N
|
1.13 kg / 2.50 LBS
~0 Gs
|
| 70 mm |
0.69 kg / 1.52 LBS
598 Gs
|
0.10 kg / 0.23 LBS
103 g / 1.0 N
|
0.62 kg / 1.37 LBS
~0 Gs
|
| 80 mm |
0.39 kg / 0.87 LBS
452 Gs
|
0.06 kg / 0.13 LBS
59 g / 0.6 N
|
0.35 kg / 0.78 LBS
~0 Gs
|
| 90 mm |
0.23 kg / 0.52 LBS
349 Gs
|
0.04 kg / 0.08 LBS
35 g / 0.3 N
|
0.21 kg / 0.47 LBS
~0 Gs
|
| 100 mm |
0.14 kg / 0.32 LBS
274 Gs
|
0.02 kg / 0.05 LBS
22 g / 0.2 N
|
0.13 kg / 0.29 LBS
~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 |
| Phone / Smartphone | 40 Gs (4.0 mT) | 8.5 cm |
| Remote | 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 (kinetic energy) - 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: Surface protection spec
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 (Pc)
MPL 50x25x12 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 42 945 Mx | 429.5 µWb |
| Pc Coefficient | 0.40 | Low (Flat) |
Table 11: Physics of underwater searching
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. Vertical hold
*Caution: On a vertical surface, the magnet retains merely ~20% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Temperature resistance
*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
The chart above illustrates the magnetic characteristics of the material within the second quadrant of the hysteresis loop. 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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also products
Strengths as well as weaknesses of rare earth magnets.
Strengths
- They have unchanged lifting capacity, and over around 10 years their attraction force decreases symbolically – ~1% (in testing),
- Neodymium magnets are exceptionally resistant to demagnetization caused by external interference,
- Thanks to the shimmering finish, the surface of nickel, gold-plated, or silver-plated gives an elegant appearance,
- Magnetic induction on the top side of the magnet is strong,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Due to the potential of flexible molding and adaptation to unique needs, neodymium magnets can be created in a variety of geometric configurations, which increases their versatility,
- Fundamental importance in electronics industry – they are commonly used in data components, electric drive systems, precision medical tools, as well as other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Weaknesses
- At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
- Due to limitations in producing threads and complex forms in magnets, we recommend using a housing - magnetic holder.
- Potential hazard related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
- Due to complex production process, their price is relatively high,
Pull force analysis
Maximum holding power of the magnet – what contributes to it?
- on a plate made of mild steel, perfectly concentrating the magnetic flux
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with an ground touching surface
- without the slightest air gap between the magnet and steel
- under axial force direction (90-degree angle)
- at temperature room level
What influences lifting capacity in practice
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
- Steel thickness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted to the other side.
- Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
- Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
Lifting capacity was measured with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet and the plate reduces the holding force.
Warnings
Health Danger
Medical warning: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have medical devices.
Handling rules
Exercise caution. Rare earth magnets attract from a long distance and connect with huge force, often quicker than you can react.
Risk of cracking
Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may shatter into hazardous fragments.
Threat to electronics
Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can irreversibly ruin these devices and erase data from cards.
Pinching danger
Protect your hands. Two large magnets will snap together immediately with a force of massive weight, destroying everything in their path. Be careful!
Phone sensors
GPS units and mobile phones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can ruin the sensors in your phone.
Adults only
NdFeB magnets are not toys. Accidental ingestion of a few magnets may result in them pinching intestinal walls, which constitutes a critical condition and requires urgent medical intervention.
Allergy Warning
It is widely known that nickel (the usual finish) is a common allergen. If your skin reacts to metals, prevent direct skin contact and choose encased magnets.
Do not overheat magnets
Monitor thermal conditions. Exposing the magnet to high heat will ruin its properties and pulling force.
Flammability
Powder generated during machining of magnets is combustible. Do not drill into magnets unless you are an expert.
