MPL 25x10x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020135
GTIN/EAN: 5906301811411
length
25 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
9.38 g
Magnetization Direction
↑ axial
Load capacity
7.49 kg / 73.45 N
Magnetic Induction
337.05 mT / 3371 Gs
Coating
[NiCuNi] Nickel
4.66 ZŁ with VAT / pcs + price for transport
3.79 ZŁ net + 23% VAT / pcs
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Technical details - MPL 25x10x5 / N38 - lamellar magnet
Specification / characteristics - MPL 25x10x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020135 |
| GTIN/EAN | 5906301811411 |
| 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 | 5 mm [±0,1 mm] |
| Weight | 9.38 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 7.49 kg / 73.45 N |
| Magnetic Induction ~ ? | 337.05 mT / 3371 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 constitute the result of a mathematical analysis. Values were calculated on models for the class Nd2Fe14B. Actual performance may differ from theoretical values. Treat these calculations as a supplementary guide during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
MPL 25x10x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3369 Gs
336.9 mT
|
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
strong |
| 1 mm |
2932 Gs
293.2 mT
|
5.67 kg / 12.51 pounds
5673.2 g / 55.7 N
|
strong |
| 2 mm |
2479 Gs
247.9 mT
|
4.06 kg / 8.94 pounds
4056.9 g / 39.8 N
|
strong |
| 3 mm |
2065 Gs
206.5 mT
|
2.81 kg / 6.21 pounds
2814.7 g / 27.6 N
|
strong |
| 5 mm |
1419 Gs
141.9 mT
|
1.33 kg / 2.93 pounds
1328.6 g / 13.0 N
|
safe |
| 10 mm |
603 Gs
60.3 mT
|
0.24 kg / 0.53 pounds
240.3 g / 2.4 N
|
safe |
| 15 mm |
296 Gs
29.6 mT
|
0.06 kg / 0.13 pounds
57.8 g / 0.6 N
|
safe |
| 20 mm |
162 Gs
16.2 mT
|
0.02 kg / 0.04 pounds
17.4 g / 0.2 N
|
safe |
| 30 mm |
62 Gs
6.2 mT
|
0.00 kg / 0.01 pounds
2.5 g / 0.0 N
|
safe |
| 50 mm |
16 Gs
1.6 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
Table 2: Sliding capacity (vertical surface)
MPL 25x10x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.50 kg / 3.30 pounds
1498.0 g / 14.7 N
|
| 1 mm | Stal (~0.2) |
1.13 kg / 2.50 pounds
1134.0 g / 11.1 N
|
| 2 mm | Stal (~0.2) |
0.81 kg / 1.79 pounds
812.0 g / 8.0 N
|
| 3 mm | Stal (~0.2) |
0.56 kg / 1.24 pounds
562.0 g / 5.5 N
|
| 5 mm | Stal (~0.2) |
0.27 kg / 0.59 pounds
266.0 g / 2.6 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 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: Wall mounting (sliding) - behavior on slippery surfaces
MPL 25x10x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.25 kg / 4.95 pounds
2247.0 g / 22.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.50 kg / 3.30 pounds
1498.0 g / 14.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.75 kg / 1.65 pounds
749.0 g / 7.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
3.75 kg / 8.26 pounds
3745.0 g / 36.7 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 25x10x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.75 kg / 1.65 pounds
749.0 g / 7.3 N
|
| 1 mm |
|
1.87 kg / 4.13 pounds
1872.5 g / 18.4 N
|
| 2 mm |
|
3.75 kg / 8.26 pounds
3745.0 g / 36.7 N
|
| 3 mm |
|
5.62 kg / 12.38 pounds
5617.5 g / 55.1 N
|
| 5 mm |
|
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
| 10 mm |
|
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
| 11 mm |
|
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
| 12 mm |
|
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 25x10x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
7.49 kg / 16.51 pounds
7490.0 g / 73.5 N
|
OK |
| 40 °C | -2.2% |
7.33 kg / 16.15 pounds
7325.2 g / 71.9 N
|
OK |
| 60 °C | -4.4% |
7.16 kg / 15.79 pounds
7160.4 g / 70.2 N
|
|
| 80 °C | -6.6% |
7.00 kg / 15.42 pounds
6995.7 g / 68.6 N
|
|
| 100 °C | -28.8% |
5.33 kg / 11.76 pounds
5332.9 g / 52.3 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 25x10x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
17.49 kg / 38.57 pounds
4 785 Gs
|
2.62 kg / 5.78 pounds
2624 g / 25.7 N
|
N/A |
| 1 mm |
15.37 kg / 33.89 pounds
6 316 Gs
|
2.31 kg / 5.08 pounds
2306 g / 22.6 N
|
13.84 kg / 30.50 pounds
~0 Gs
|
| 2 mm |
13.25 kg / 29.21 pounds
5 864 Gs
|
1.99 kg / 4.38 pounds
1987 g / 19.5 N
|
11.92 kg / 26.29 pounds
~0 Gs
|
| 3 mm |
11.26 kg / 24.83 pounds
5 407 Gs
|
1.69 kg / 3.72 pounds
1690 g / 16.6 N
|
10.14 kg / 22.35 pounds
~0 Gs
|
| 5 mm |
7.91 kg / 17.44 pounds
4 531 Gs
|
1.19 kg / 2.62 pounds
1187 g / 11.6 N
|
7.12 kg / 15.70 pounds
~0 Gs
|
| 10 mm |
3.10 kg / 6.84 pounds
2 838 Gs
|
0.47 kg / 1.03 pounds
465 g / 4.6 N
|
2.79 kg / 6.16 pounds
~0 Gs
|
| 20 mm |
0.56 kg / 1.24 pounds
1 207 Gs
|
0.08 kg / 0.19 pounds
84 g / 0.8 N
|
0.51 kg / 1.11 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 pounds
194 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 pounds
124 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 / 0.01 pounds
84 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
59 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
43 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
32 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - warnings
MPL 25x10x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Collisions (cracking risk) - warning
MPL 25x10x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
29.06 km/h
(8.07 m/s)
|
0.31 J | |
| 30 mm |
49.37 km/h
(13.71 m/s)
|
0.88 J | |
| 50 mm |
63.73 km/h
(17.70 m/s)
|
1.47 J | |
| 100 mm |
90.12 km/h
(25.03 m/s)
|
2.94 J |
Table 9: Surface protection spec
MPL 25x10x5 / 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 (Pc)
MPL 25x10x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 8 245 Mx | 82.5 µWb |
| Pc Coefficient | 0.38 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 25x10x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 7.49 kg | Standard |
| Water (riverbed) |
8.58 kg
(+1.09 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical wall, the magnet retains merely approx. 20-30% of its max power.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) drastically reduces the holding force.
3. Temperature resistance
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38
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.
Chemical composition
| 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 proposals
Advantages as well as disadvantages of Nd2Fe14B magnets.
Advantages
- Their power is maintained, and after around 10 years it drops only by ~1% (according to research),
- Magnets perfectly protect themselves against loss of magnetization caused by ambient magnetic noise,
- By covering with a shiny layer of silver, the element has an aesthetic look,
- The surface of neodymium magnets generates a unique magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to the ability of precise forming and adaptation to individualized solutions, magnetic components can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
- Fundamental importance in innovative solutions – they are commonly used in HDD drives, electric drive systems, diagnostic systems, also multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 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 resistant to moisture, when using outdoors
- Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic holder.
- Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets can complicate diagnosis medical when they are in the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Lifting parameters
Optimal lifting capacity of a neodymium magnet – what affects it?
- using a base made of low-carbon steel, serving as a circuit closing element
- possessing a massiveness of min. 10 mm to avoid saturation
- with an ideally smooth contact surface
- with zero gap (without coatings)
- during detachment in a direction vertical to the plane
- at ambient temperature room level
Impact of factors on magnetic holding capacity in practice
- Distance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Load vector – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Steel type – mild steel gives the best results. Alloy steels lower magnetic permeability and lifting capacity.
- Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
- Heat – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Moreover, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
H&S for magnets
Fire risk
Dust generated during machining of magnets is combustible. Avoid drilling into magnets unless you are an expert.
Keep away from electronics
Remember: rare earth magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your mobile, device, and navigation systems.
Permanent damage
Monitor thermal conditions. Exposing the magnet to high heat will destroy its magnetic structure and strength.
Nickel coating and allergies
Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease working with magnets and use protective gear.
ICD Warning
Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Electronic hazard
Do not bring magnets near a purse, computer, or screen. The magnetic field can permanently damage these devices and erase data from cards.
Material brittleness
Despite metallic appearance, the material is delicate and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.
Conscious usage
Use magnets consciously. Their powerful strength can shock even experienced users. Stay alert and respect their force.
Bone fractures
Large magnets can break fingers in a fraction of a second. Under no circumstances put your hand between two attracting surfaces.
No play value
Product intended for adults. Small elements pose a choking risk, leading to serious injuries. Store out of reach of kids and pets.
