MPL 25x10x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020387
GTIN/EAN: 5906301811862
length
25 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
5.63 g
Magnetization Direction
↑ axial
Load capacity
4.14 kg / 40.56 N
Magnetic Induction
230.69 mT / 2307 Gs
Coating
[NiCuNi] Nickel
3.57 ZŁ with VAT / pcs + price for transport
2.90 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical data - MPL 25x10x3 / N38 - lamellar magnet
Specification / characteristics - MPL 25x10x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020387 |
| GTIN/EAN | 5906301811862 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 5.63 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 4.14 kg / 40.56 N |
| Magnetic Induction ~ ? | 230.69 mT / 2307 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 assembly - data
Presented information constitute the result of a physical calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world parameters may deviate from the simulation results. Use these data as a reference point when designing systems.
Table 1: Static pull force (pull vs gap) - interaction chart
MPL 25x10x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2306 Gs
230.6 mT
|
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
strong |
| 1 mm |
2050 Gs
205.0 mT
|
3.27 kg / 7.21 pounds
3272.4 g / 32.1 N
|
strong |
| 2 mm |
1752 Gs
175.2 mT
|
2.39 kg / 5.27 pounds
2388.9 g / 23.4 N
|
strong |
| 3 mm |
1463 Gs
146.3 mT
|
1.67 kg / 3.68 pounds
1667.1 g / 16.4 N
|
safe |
| 5 mm |
1000 Gs
100.0 mT
|
0.78 kg / 1.72 pounds
779.2 g / 7.6 N
|
safe |
| 10 mm |
416 Gs
41.6 mT
|
0.13 kg / 0.30 pounds
134.4 g / 1.3 N
|
safe |
| 15 mm |
200 Gs
20.0 mT
|
0.03 kg / 0.07 pounds
31.0 g / 0.3 N
|
safe |
| 20 mm |
108 Gs
10.8 mT
|
0.01 kg / 0.02 pounds
9.0 g / 0.1 N
|
safe |
| 30 mm |
40 Gs
4.0 mT
|
0.00 kg / 0.00 pounds
1.3 g / 0.0 N
|
safe |
| 50 mm |
10 Gs
1.0 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
Table 2: Slippage force (vertical surface)
MPL 25x10x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
|
| 1 mm | Stal (~0.2) |
0.65 kg / 1.44 pounds
654.0 g / 6.4 N
|
| 2 mm | Stal (~0.2) |
0.48 kg / 1.05 pounds
478.0 g / 4.7 N
|
| 3 mm | Stal (~0.2) |
0.33 kg / 0.74 pounds
334.0 g / 3.3 N
|
| 5 mm | Stal (~0.2) |
0.16 kg / 0.34 pounds
156.0 g / 1.5 N
|
| 10 mm | Stal (~0.2) |
0.03 kg / 0.06 pounds
26.0 g / 0.3 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
2.0 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 (sliding) - behavior on slippery surfaces
MPL 25x10x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.24 kg / 2.74 pounds
1242.0 g / 12.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.83 kg / 1.83 pounds
828.0 g / 8.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 25x10x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.41 kg / 0.91 pounds
414.0 g / 4.1 N
|
| 1 mm |
|
1.04 kg / 2.28 pounds
1035.0 g / 10.2 N
|
| 2 mm |
|
2.07 kg / 4.56 pounds
2070.0 g / 20.3 N
|
| 3 mm |
|
3.10 kg / 6.85 pounds
3105.0 g / 30.5 N
|
| 5 mm |
|
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
| 10 mm |
|
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
| 11 mm |
|
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
| 12 mm |
|
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 25x10x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
4.14 kg / 9.13 pounds
4140.0 g / 40.6 N
|
OK |
| 40 °C | -2.2% |
4.05 kg / 8.93 pounds
4048.9 g / 39.7 N
|
OK |
| 60 °C | -4.4% |
3.96 kg / 8.73 pounds
3957.8 g / 38.8 N
|
|
| 80 °C | -6.6% |
3.87 kg / 8.52 pounds
3866.8 g / 37.9 N
|
|
| 100 °C | -28.8% |
2.95 kg / 6.50 pounds
2947.7 g / 28.9 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 25x10x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
8.20 kg / 18.07 pounds
3 767 Gs
|
1.23 kg / 2.71 pounds
1230 g / 12.1 N
|
N/A |
| 1 mm |
7.38 kg / 16.27 pounds
4 377 Gs
|
1.11 kg / 2.44 pounds
1107 g / 10.9 N
|
6.64 kg / 14.65 pounds
~0 Gs
|
| 2 mm |
6.48 kg / 14.28 pounds
4 101 Gs
|
0.97 kg / 2.14 pounds
972 g / 9.5 N
|
5.83 kg / 12.86 pounds
~0 Gs
|
| 3 mm |
5.58 kg / 12.30 pounds
3 805 Gs
|
0.84 kg / 1.84 pounds
837 g / 8.2 N
|
5.02 kg / 11.07 pounds
~0 Gs
|
| 5 mm |
3.97 kg / 8.74 pounds
3 208 Gs
|
0.59 kg / 1.31 pounds
595 g / 5.8 N
|
3.57 kg / 7.87 pounds
~0 Gs
|
| 10 mm |
1.54 kg / 3.40 pounds
2 001 Gs
|
0.23 kg / 0.51 pounds
231 g / 2.3 N
|
1.39 kg / 3.06 pounds
~0 Gs
|
| 20 mm |
0.27 kg / 0.59 pounds
831 Gs
|
0.04 kg / 0.09 pounds
40 g / 0.4 N
|
0.24 kg / 0.53 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.01 pounds
127 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
80 Gs
|
0.00 kg / 0.00 pounds
0 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
27 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
20 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 25x10x3 / 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 |
| Mobile device | 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) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 25x10x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
27.90 km/h
(7.75 m/s)
|
0.17 J | |
| 30 mm |
47.38 km/h
(13.16 m/s)
|
0.49 J | |
| 50 mm |
61.15 km/h
(16.99 m/s)
|
0.81 J | |
| 100 mm |
86.48 km/h
(24.02 m/s)
|
1.62 J |
Table 9: Corrosion resistance
MPL 25x10x3 / 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 25x10x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 5 928 Mx | 59.3 µWb |
| Pc Coefficient | 0.25 | Low (Flat) |
Table 11: Submerged application
MPL 25x10x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 4.14 kg | Standard |
| Water (riverbed) |
4.74 kg
(+0.60 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet holds just ~20% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*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) = 0.25
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% |
Environmental data
| 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 rare earth magnets.
Advantages
- They do not lose magnetism, even over nearly ten years – the decrease in strength is only ~1% (based on measurements),
- Magnets very well resist against loss of magnetization caused by ambient magnetic noise,
- By using a lustrous coating of silver, the element presents an elegant look,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of precise forming and adjusting to defined needs,
- Fundamental importance in high-tech industry – they serve a role in mass storage devices, brushless drives, medical equipment, also multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Disadvantages
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their durability
- Neodymium magnets lose their power 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
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
- Limited possibility of creating threads in the magnet and complex forms - preferred is cover - magnet mounting.
- Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which is particularly important in the context of child safety. Additionally, small elements of these magnets can disrupt the diagnostic process medical in case of swallowing.
- With large orders the cost of neodymium magnets can be a barrier,
Holding force characteristics
Highest magnetic holding force – what contributes to it?
- using a base made of low-carbon steel, functioning as a ideal flux conductor
- with a thickness of at least 10 mm
- with a plane perfectly flat
- without the slightest air gap between the magnet and steel
- during detachment in a direction vertical to the mounting surface
- at ambient temperature room level
Magnet lifting force in use – key factors
- Gap between surfaces – every millimeter of separation (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
- Plate texture – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
- Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.
Lifting capacity was assessed with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with neodymium magnets
Immense force
Before starting, check safety instructions. Sudden snapping can break the magnet or hurt your hand. Be predictive.
Bone fractures
Danger of trauma: The attraction force is so great that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.
Implant safety
Medical warning: Neodymium magnets can turn off heart devices and defibrillators. Do not approach if you have electronic implants.
Machining danger
Fire warning: Neodymium dust is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Swallowing risk
Always store magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are life-threatening.
Beware of splinters
Despite the nickel coating, the material is brittle and not impact-resistant. Do not hit, as the magnet may shatter into hazardous fragments.
Do not overheat magnets
Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. The loss of strength is permanent.
Threat to electronics
Avoid bringing magnets close to a wallet, computer, or screen. The magnetism can permanently damage these devices and wipe information from cards.
GPS Danger
GPS units and mobile phones are extremely susceptible to magnetic fields. Close proximity with a powerful NdFeB magnet can ruin the sensors in your phone.
Avoid contact if allergic
Certain individuals have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching might lead to dermatitis. We suggest wear safety gloves.
