MPL 25x25x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020137
GTIN/EAN: 5906301811435
length
25 mm [±0,1 mm]
Width
25 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
46.88 g
Magnetization Direction
↑ axial
Load capacity
19.39 kg / 190.25 N
Magnetic Induction
361.04 mT / 3610 Gs
Coating
[NiCuNi] Nickel
20.29 ZŁ with VAT / pcs + price for transport
16.50 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical specification of the product - MPL 25x25x10 / N38 - lamellar magnet
Specification / characteristics - MPL 25x25x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020137 |
| GTIN/EAN | 5906301811435 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 25 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 46.88 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 19.39 kg / 190.25 N |
| Magnetic Induction ~ ? | 361.04 mT / 3610 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 product - report
Presented data are the result of a physical simulation. Values were calculated on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - power drop
MPL 25x25x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3610 Gs
361.0 mT
|
19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
|
crushing |
| 1 mm |
3392 Gs
339.2 mT
|
17.12 kg / 37.74 LBS
17117.7 g / 167.9 N
|
crushing |
| 2 mm |
3156 Gs
315.6 mT
|
14.82 kg / 32.68 LBS
14822.5 g / 145.4 N
|
crushing |
| 3 mm |
2913 Gs
291.3 mT
|
12.63 kg / 27.85 LBS
12631.8 g / 123.9 N
|
crushing |
| 5 mm |
2436 Gs
243.6 mT
|
8.83 kg / 19.46 LBS
8827.9 g / 86.6 N
|
warning |
| 10 mm |
1464 Gs
146.4 mT
|
3.19 kg / 7.04 LBS
3191.5 g / 31.3 N
|
warning |
| 15 mm |
872 Gs
87.2 mT
|
1.13 kg / 2.49 LBS
1131.5 g / 11.1 N
|
low risk |
| 20 mm |
538 Gs
53.8 mT
|
0.43 kg / 0.95 LBS
430.4 g / 4.2 N
|
low risk |
| 30 mm |
234 Gs
23.4 mT
|
0.08 kg / 0.18 LBS
81.8 g / 0.8 N
|
low risk |
| 50 mm |
68 Gs
6.8 mT
|
0.01 kg / 0.02 LBS
6.9 g / 0.1 N
|
low risk |
Table 2: Slippage hold (wall)
MPL 25x25x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
|
| 1 mm | Stal (~0.2) |
3.42 kg / 7.55 LBS
3424.0 g / 33.6 N
|
| 2 mm | Stal (~0.2) |
2.96 kg / 6.53 LBS
2964.0 g / 29.1 N
|
| 3 mm | Stal (~0.2) |
2.53 kg / 5.57 LBS
2526.0 g / 24.8 N
|
| 5 mm | Stal (~0.2) |
1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
|
| 10 mm | Stal (~0.2) |
0.64 kg / 1.41 LBS
638.0 g / 6.3 N
|
| 15 mm | Stal (~0.2) |
0.23 kg / 0.50 LBS
226.0 g / 2.2 N
|
| 20 mm | Stal (~0.2) |
0.09 kg / 0.19 LBS
86.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
16.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - behavior on slippery surfaces
MPL 25x25x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.82 kg / 12.82 LBS
5817.0 g / 57.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.88 kg / 8.55 LBS
3878.0 g / 38.0 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.94 kg / 4.27 LBS
1939.0 g / 19.0 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
9.70 kg / 21.37 LBS
9695.0 g / 95.1 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 25x25x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.97 kg / 2.14 LBS
969.5 g / 9.5 N
|
| 1 mm |
|
2.42 kg / 5.34 LBS
2423.8 g / 23.8 N
|
| 2 mm |
|
4.85 kg / 10.69 LBS
4847.5 g / 47.6 N
|
| 3 mm |
|
7.27 kg / 16.03 LBS
7271.3 g / 71.3 N
|
| 5 mm |
|
12.12 kg / 26.72 LBS
12118.8 g / 118.9 N
|
| 10 mm |
|
19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
|
| 11 mm |
|
19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
|
| 12 mm |
|
19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
|
Table 5: Working in heat (stability) - power drop
MPL 25x25x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
19.39 kg / 42.75 LBS
19390.0 g / 190.2 N
|
OK |
| 40 °C | -2.2% |
18.96 kg / 41.81 LBS
18963.4 g / 186.0 N
|
OK |
| 60 °C | -4.4% |
18.54 kg / 40.87 LBS
18536.8 g / 181.8 N
|
|
| 80 °C | -6.6% |
18.11 kg / 39.93 LBS
18110.3 g / 177.7 N
|
|
| 100 °C | -28.8% |
13.81 kg / 30.44 LBS
13805.7 g / 135.4 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 25x25x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
50.20 kg / 110.68 LBS
5 073 Gs
|
7.53 kg / 16.60 LBS
7531 g / 73.9 N
|
N/A |
| 1 mm |
47.31 kg / 104.30 LBS
7 008 Gs
|
7.10 kg / 15.65 LBS
7097 g / 69.6 N
|
42.58 kg / 93.87 LBS
~0 Gs
|
| 2 mm |
44.32 kg / 97.71 LBS
6 783 Gs
|
6.65 kg / 14.66 LBS
6648 g / 65.2 N
|
39.89 kg / 87.94 LBS
~0 Gs
|
| 3 mm |
41.33 kg / 91.12 LBS
6 550 Gs
|
6.20 kg / 13.67 LBS
6200 g / 60.8 N
|
37.20 kg / 82.01 LBS
~0 Gs
|
| 5 mm |
35.49 kg / 78.25 LBS
6 070 Gs
|
5.32 kg / 11.74 LBS
5324 g / 52.2 N
|
31.94 kg / 70.43 LBS
~0 Gs
|
| 10 mm |
22.86 kg / 50.39 LBS
4 871 Gs
|
3.43 kg / 7.56 LBS
3429 g / 33.6 N
|
20.57 kg / 45.35 LBS
~0 Gs
|
| 20 mm |
8.26 kg / 18.22 LBS
2 929 Gs
|
1.24 kg / 2.73 LBS
1240 g / 12.2 N
|
7.44 kg / 16.40 LBS
~0 Gs
|
| 50 mm |
0.46 kg / 1.02 LBS
695 Gs
|
0.07 kg / 0.15 LBS
70 g / 0.7 N
|
0.42 kg / 0.92 LBS
~0 Gs
|
| 60 mm |
0.21 kg / 0.47 LBS
469 Gs
|
0.03 kg / 0.07 LBS
32 g / 0.3 N
|
0.19 kg / 0.42 LBS
~0 Gs
|
| 70 mm |
0.10 kg / 0.23 LBS
329 Gs
|
0.02 kg / 0.03 LBS
16 g / 0.2 N
|
0.09 kg / 0.21 LBS
~0 Gs
|
| 80 mm |
0.05 kg / 0.12 LBS
239 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.11 LBS
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 LBS
178 Gs
|
0.00 kg / 0.01 LBS
5 g / 0.0 N
|
0.03 kg / 0.06 LBS
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 LBS
136 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MPL 25x25x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.5 cm |
| Car key | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 25x25x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.52 km/h
(6.26 m/s)
|
0.92 J | |
| 30 mm |
35.62 km/h
(9.89 m/s)
|
2.29 J | |
| 50 mm |
45.87 km/h
(12.74 m/s)
|
3.81 J | |
| 100 mm |
64.86 km/h
(18.02 m/s)
|
7.61 J |
Table 9: Coating parameters (durability)
MPL 25x25x10 / 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 25x25x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 23 497 Mx | 235.0 µWb |
| Pc Coefficient | 0.46 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 25x25x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 19.39 kg | Standard |
| Water (riverbed) |
22.20 kg
(+2.81 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Temperature resistance
*For N38 material, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.46
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 offers
Pros and cons of neodymium magnets.
Benefits
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
- They possess excellent resistance to weakening of magnetic properties due to external fields,
- A magnet with a metallic silver surface is more attractive,
- Magnets are characterized by excellent magnetic induction on the outer side,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Possibility of accurate forming as well as modifying to precise applications,
- Significant place in advanced technology sectors – they serve a role in HDD drives, motor assemblies, diagnostic systems, and technologically advanced constructions.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets decrease their force 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 stable to moisture, when using outdoors
- We suggest cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
- Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small components of these products are able to be problematic in diagnostics medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Maximum magnetic pulling force – what it depends on?
- with the use of a sheet made of low-carbon steel, ensuring maximum field concentration
- whose transverse dimension reaches at least 10 mm
- characterized by smoothness
- without any clearance between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at ambient temperature room level
Key elements affecting lifting force
- Distance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Load vector – highest force is available only during perpendicular pulling. The resistance to sliding of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Steel type – mild steel attracts best. Alloy admixtures reduce magnetic properties and holding force.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Uneven metal weaken the grip.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate decreases the lifting capacity.
Safe handling of NdFeB magnets
Adults only
Neodymium magnets are not suitable for play. Accidental ingestion of multiple magnets can lead to them pinching intestinal walls, which constitutes a direct threat to life and necessitates urgent medical intervention.
Medical implants
For implant holders: Powerful magnets disrupt medical devices. Maintain at least 30 cm distance or request help to work with the magnets.
GPS and phone interference
Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.
Eye protection
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Bodily injuries
Mind your fingers. Two large magnets will join immediately with a force of massive weight, destroying everything in their path. Exercise extreme caution!
Immense force
Be careful. Rare earth magnets act from a distance and snap with massive power, often faster than you can react.
Dust explosion hazard
Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Magnetic media
Data protection: Strong magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Maximum temperature
Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and pulling force.
Nickel coating and allergies
Studies show that nickel (the usual finish) is a common allergen. For allergy sufferers, avoid touching magnets with bare hands or select coated magnets.
