MPL 25x2x6 / N38 - lamellar magnet
lamellar magnet
Catalog no 020509
length
25 mm [±0,1 mm]
Width
2 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
2.25 g
Magnetization Direction
↑ axial
Load capacity
2.33 kg / 22.82 N
Magnetic Induction
558.90 mT / 5589 Gs
Coating
[NiCuNi] Nickel
0.713 ZŁ with VAT / pcs + price for transport
0.580 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MPL 25x2x6 / N38 - lamellar magnet
Specification / characteristics - MPL 25x2x6 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020509 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 25 mm [±0,1 mm] |
| Width | 2 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 2.25 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.33 kg / 22.82 N |
| Magnetic Induction ~ ? | 558.90 mT / 5589 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 magnet - technical parameters
These information are the result of a engineering simulation. Results are based on algorithms for the class Nd2Fe14B. Operational parameters may differ. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs distance) - interaction chart
MPL 25x2x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5574 Gs
557.4 mT
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
strong |
| 1 mm |
2599 Gs
259.9 mT
|
0.51 kg / 1.12 lbs
506.6 g / 5.0 N
|
safe |
| 2 mm |
1392 Gs
139.2 mT
|
0.15 kg / 0.32 lbs
145.3 g / 1.4 N
|
safe |
| 3 mm |
879 Gs
87.9 mT
|
0.06 kg / 0.13 lbs
58.0 g / 0.6 N
|
safe |
| 5 mm |
454 Gs
45.4 mT
|
0.02 kg / 0.03 lbs
15.5 g / 0.2 N
|
safe |
| 10 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 lbs
1.8 g / 0.0 N
|
safe |
| 15 mm |
72 Gs
7.2 mT
|
0.00 kg / 0.00 lbs
0.4 g / 0.0 N
|
safe |
| 20 mm |
39 Gs
3.9 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
| 30 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Slippage load (vertical surface)
MPL 25x2x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.22 lbs
102.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
30.0 g / 0.3 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MPL 25x2x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.70 kg / 1.54 lbs
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 lbs
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 25x2x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 lbs
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 lbs
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 lbs
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 lbs
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 25x2x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.33 kg / 5.14 lbs
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 lbs
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 lbs
2227.5 g / 21.9 N
|
OK |
| 80 °C | -6.6% |
2.18 kg / 4.80 lbs
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 lbs
1659.0 g / 16.3 N
|
Table 6: Two magnets (attraction) - forces in the system
MPL 25x2x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
9.58 kg / 21.12 lbs
5 924 Gs
|
1.44 kg / 3.17 lbs
1437 g / 14.1 N
|
N/A |
| 1 mm |
4.52 kg / 9.97 lbs
7 659 Gs
|
0.68 kg / 1.49 lbs
678 g / 6.7 N
|
4.07 kg / 8.97 lbs
~0 Gs
|
| 2 mm |
2.08 kg / 4.59 lbs
5 198 Gs
|
0.31 kg / 0.69 lbs
312 g / 3.1 N
|
1.87 kg / 4.13 lbs
~0 Gs
|
| 3 mm |
1.06 kg / 2.34 lbs
3 708 Gs
|
0.16 kg / 0.35 lbs
159 g / 1.6 N
|
0.95 kg / 2.10 lbs
~0 Gs
|
| 5 mm |
0.37 kg / 0.81 lbs
2 179 Gs
|
0.05 kg / 0.12 lbs
55 g / 0.5 N
|
0.33 kg / 0.73 lbs
~0 Gs
|
| 10 mm |
0.06 kg / 0.14 lbs
909 Gs
|
0.01 kg / 0.02 lbs
10 g / 0.1 N
|
0.06 kg / 0.13 lbs
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 lbs
311 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
46 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
29 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
20 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
14 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
10 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
8 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
MPL 25x2x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 3.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Dynamics (cracking risk) - warning
MPL 25x2x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
32.47 km/h
(9.02 m/s)
|
0.09 J | |
| 30 mm |
56.21 km/h
(15.61 m/s)
|
0.27 J | |
| 50 mm |
72.57 km/h
(20.16 m/s)
|
0.46 J | |
| 100 mm |
102.63 km/h
(28.51 m/s)
|
0.91 J |
Table 9: Coating parameters (durability)
MPL 25x2x6 / 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 25x2x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 608 Mx | 26.1 µWb |
| Pc Coefficient | 0.76 | High (Stable) |
Table 11: Underwater work (magnet fishing)
MPL 25x2x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.33 kg | Standard |
| Water (riverbed) |
2.67 kg
(+0.34 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. computer case) severely limits the holding force.
3. Thermal stability
*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) = 0.76
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also offers
Pros as well as cons of neodymium magnets.
Strengths
- They do not lose strength, even during nearly 10 years – the drop in lifting capacity is only ~1% (theoretically),
- They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
- In other words, due to the metallic surface of gold, the element gains visual value,
- Magnetic induction on the top side of the magnet remains impressive,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Thanks to modularity in forming and the capacity to adapt to complex applications,
- Significant place in future technologies – they are used in hard drives, electric drive systems, advanced medical instruments, as well as modern systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
- NdFeB magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing nuts and complex shapes in magnets, we propose using casing - magnetic mechanism.
- Possible danger to health – tiny shards of magnets pose a threat, if swallowed, which becomes key in the context of child safety. It is also worth noting that tiny parts of these devices can complicate diagnosis medical when they are in the body.
- Due to neodymium price, their price is higher than average,
Holding force characteristics
Detachment force of the magnet in optimal conditions – what affects it?
- with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
- possessing a massiveness of minimum 10 mm to ensure full flux closure
- with an ground touching surface
- without any insulating layer between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- in neutral thermal conditions
Key elements affecting lifting force
- Gap (between the magnet and the metal), since even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
- Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Metal type – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under parallel forces the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the lifting capacity.
Safety rules for work with NdFeB magnets
GPS Danger
An intense magnetic field negatively affects the operation of compasses in smartphones and GPS navigation. Keep magnets near a smartphone to prevent damaging the sensors.
Physical harm
Protect your hands. Two powerful magnets will snap together immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Protect data
Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Keep a distance of at least 10 cm.
Sensitization to coating
Nickel alert: The nickel-copper-nickel coating contains nickel. If an allergic reaction appears, cease working with magnets and wear gloves.
Fire warning
Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Maximum temperature
Keep cool. Neodymium magnets are susceptible to temperature. If you need operation above 80°C, look for HT versions (H, SH, UH).
Protective goggles
Despite metallic appearance, the material is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Powerful field
Use magnets with awareness. Their huge power can shock even professionals. Be vigilant and respect their power.
Medical implants
Life threat: Neodymium magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.
No play value
Strictly keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are fatal.
