MPL 25x15x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020392
GTIN/EAN: 5906301811893
length
25 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
5.63 g
Magnetization Direction
↑ axial
Load capacity
1.89 kg / 18.53 N
Magnetic Induction
120.03 mT / 1200 Gs
Coating
[NiCuNi] Nickel
2.39 ZŁ with VAT / pcs + price for transport
1.940 ZŁ net + 23% VAT / pcs
bulk discounts:
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Product card - MPL 25x15x2 / N38 - lamellar magnet
Specification / characteristics - MPL 25x15x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020392 |
| GTIN/EAN | 5906301811893 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 5.63 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 1.89 kg / 18.53 N |
| Magnetic Induction ~ ? | 120.03 mT / 1200 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 analysis of the product - technical parameters
Presented data represent the result of a physical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance may deviate from the simulation results. Use these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
MPL 25x15x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1200 Gs
120.0 mT
|
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
low risk |
| 1 mm |
1144 Gs
114.4 mT
|
1.72 kg / 3.79 pounds
1717.6 g / 16.8 N
|
low risk |
| 2 mm |
1060 Gs
106.0 mT
|
1.48 kg / 3.25 pounds
1475.6 g / 14.5 N
|
low risk |
| 3 mm |
961 Gs
96.1 mT
|
1.21 kg / 2.67 pounds
1212.1 g / 11.9 N
|
low risk |
| 5 mm |
754 Gs
75.4 mT
|
0.75 kg / 1.65 pounds
746.8 g / 7.3 N
|
low risk |
| 10 mm |
376 Gs
37.6 mT
|
0.19 kg / 0.41 pounds
185.6 g / 1.8 N
|
low risk |
| 15 mm |
193 Gs
19.3 mT
|
0.05 kg / 0.11 pounds
48.9 g / 0.5 N
|
low risk |
| 20 mm |
107 Gs
10.7 mT
|
0.02 kg / 0.03 pounds
15.0 g / 0.1 N
|
low risk |
| 30 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.00 pounds
2.2 g / 0.0 N
|
low risk |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
Table 2: Sliding capacity (vertical surface)
MPL 25x15x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.38 kg / 0.83 pounds
378.0 g / 3.7 N
|
| 1 mm | Stal (~0.2) |
0.34 kg / 0.76 pounds
344.0 g / 3.4 N
|
| 2 mm | Stal (~0.2) |
0.30 kg / 0.65 pounds
296.0 g / 2.9 N
|
| 3 mm | Stal (~0.2) |
0.24 kg / 0.53 pounds
242.0 g / 2.4 N
|
| 5 mm | Stal (~0.2) |
0.15 kg / 0.33 pounds
150.0 g / 1.5 N
|
| 10 mm | Stal (~0.2) |
0.04 kg / 0.08 pounds
38.0 g / 0.4 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.02 pounds
10.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 25x15x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.57 kg / 1.25 pounds
567.0 g / 5.6 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.38 kg / 0.83 pounds
378.0 g / 3.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.19 kg / 0.42 pounds
189.0 g / 1.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.95 kg / 2.08 pounds
945.0 g / 9.3 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 25x15x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.19 kg / 0.42 pounds
189.0 g / 1.9 N
|
| 1 mm |
|
0.47 kg / 1.04 pounds
472.5 g / 4.6 N
|
| 2 mm |
|
0.95 kg / 2.08 pounds
945.0 g / 9.3 N
|
| 3 mm |
|
1.42 kg / 3.13 pounds
1417.5 g / 13.9 N
|
| 5 mm |
|
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
| 10 mm |
|
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
| 11 mm |
|
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
| 12 mm |
|
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 25x15x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
1.89 kg / 4.17 pounds
1890.0 g / 18.5 N
|
OK |
| 40 °C | -2.2% |
1.85 kg / 4.08 pounds
1848.4 g / 18.1 N
|
OK |
| 60 °C | -4.4% |
1.81 kg / 3.98 pounds
1806.8 g / 17.7 N
|
|
| 80 °C | -6.6% |
1.77 kg / 3.89 pounds
1765.3 g / 17.3 N
|
|
| 100 °C | -28.8% |
1.35 kg / 2.97 pounds
1345.7 g / 13.2 N
|
Table 6: Two magnets (repulsion) - field range
MPL 25x15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.33 kg / 7.34 pounds
2 260 Gs
|
0.50 kg / 1.10 pounds
499 g / 4.9 N
|
N/A |
| 1 mm |
3.20 kg / 7.05 pounds
2 353 Gs
|
0.48 kg / 1.06 pounds
480 g / 4.7 N
|
2.88 kg / 6.35 pounds
~0 Gs
|
| 2 mm |
3.03 kg / 6.67 pounds
2 288 Gs
|
0.45 kg / 1.00 pounds
454 g / 4.5 N
|
2.72 kg / 6.00 pounds
~0 Gs
|
| 3 mm |
2.82 kg / 6.22 pounds
2 210 Gs
|
0.42 kg / 0.93 pounds
423 g / 4.2 N
|
2.54 kg / 5.60 pounds
~0 Gs
|
| 5 mm |
2.37 kg / 5.22 pounds
2 024 Gs
|
0.36 kg / 0.78 pounds
355 g / 3.5 N
|
2.13 kg / 4.70 pounds
~0 Gs
|
| 10 mm |
1.32 kg / 2.90 pounds
1 509 Gs
|
0.20 kg / 0.44 pounds
197 g / 1.9 N
|
1.18 kg / 2.61 pounds
~0 Gs
|
| 20 mm |
0.33 kg / 0.72 pounds
752 Gs
|
0.05 kg / 0.11 pounds
49 g / 0.5 N
|
0.29 kg / 0.65 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 pounds
128 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.01 pounds
81 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
54 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
38 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
28 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
21 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Hazards (implants) - warnings
MPL 25x15x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 4.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 25x15x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.58 km/h
(5.44 m/s)
|
0.08 J | |
| 30 mm |
32.03 km/h
(8.90 m/s)
|
0.22 J | |
| 50 mm |
41.32 km/h
(11.48 m/s)
|
0.37 J | |
| 100 mm |
58.43 km/h
(16.23 m/s)
|
0.74 J |
Table 9: Coating parameters (durability)
MPL 25x15x2 / 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 (Flux)
MPL 25x15x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 600 Mx | 56.0 µWb |
| Pc Coefficient | 0.14 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 25x15x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 1.89 kg | Standard |
| Water (riverbed) |
2.16 kg
(+0.27 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Temperature resistance
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.14
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 |
See also deals
Advantages as well as disadvantages of rare earth magnets.
Strengths
- They have unchanged lifting capacity, and over around ten years their performance decreases symbolically – ~1% (in testing),
- They feature excellent resistance to weakening of magnetic properties due to opposing magnetic fields,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
- Thanks to freedom in designing and the capacity to adapt to client solutions,
- Wide application in future technologies – they find application in HDD drives, drive modules, medical devices, as well as other advanced devices.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Limitations
- At very strong impacts they can crack, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's 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 recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited ability of creating nuts in the magnet and complicated forms - preferred is a housing - magnet mounting.
- Health risk to health – tiny shards of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small components of these products are able to complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets can be a barrier,
Holding force characteristics
Highest magnetic holding force – what it depends on?
- with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- whose transverse dimension reaches at least 10 mm
- with a surface perfectly flat
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- in neutral thermal conditions
Practical aspects of lifting capacity – factors
- Air gap (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
- Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of nominal force).
- Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the power to be escaped to the other side.
- Material type – the best choice is pure iron steel. Hardened steels may attract less.
- Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness creates an air distance.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Bone fractures
Protect your hands. Two powerful magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Avoid contact if allergic
It is widely known that the nickel plating (standard magnet coating) is a common allergen. If you have an allergy, refrain from touching magnets with bare hands or choose coated magnets.
GPS and phone interference
Navigation devices and smartphones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Magnet fragility
Protect your eyes. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.
Warning for heart patients
Individuals with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the operation of the life-saving device.
Handling rules
Be careful. Rare earth magnets attract from a distance and connect with massive power, often faster than you can react.
Keep away from computers
Data protection: Strong magnets can damage payment cards and sensitive devices (pacemakers, medical aids, timepieces).
Maximum temperature
Avoid heat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
Swallowing risk
Product intended for adults. Small elements pose a choking risk, leading to severe trauma. Store away from kids and pets.
Mechanical processing
Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust reacts violently with oxygen and is hard to extinguish.
