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
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Technical parameters - 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 |
Physical modeling of the assembly - report
Presented information constitute the result of a engineering simulation. Results are based on models for the material Nd2Fe14B. Actual conditions might slightly differ. Use these calculations as a supplementary guide for designers.
Table 1: Static force (pull vs gap) - characteristics
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
|
warning |
| 1 mm |
2599 Gs
259.9 mT
|
0.51 kg / 1.12 LBS
506.6 g / 5.0 N
|
low risk |
| 2 mm |
1392 Gs
139.2 mT
|
0.15 kg / 0.32 LBS
145.3 g / 1.4 N
|
low risk |
| 3 mm |
879 Gs
87.9 mT
|
0.06 kg / 0.13 LBS
58.0 g / 0.6 N
|
low risk |
| 5 mm |
454 Gs
45.4 mT
|
0.02 kg / 0.03 LBS
15.5 g / 0.2 N
|
low risk |
| 10 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 LBS
1.8 g / 0.0 N
|
low risk |
| 15 mm |
72 Gs
7.2 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
low risk |
| 20 mm |
39 Gs
3.9 mT
|
0.00 kg / 0.00 LBS
0.1 g / 0.0 N
|
low risk |
| 30 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
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: Steel thickness (saturation) - 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) - power drop
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 (repulsion) - field range
MPL 25x2x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (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: Protective zones (implants) - warnings
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 |
| Remote | 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: Collisions (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: Surface protection spec
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: Electrical data (Pc)
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)
*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.76
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other products
Advantages and disadvantages of Nd2Fe14B magnets.
Strengths
- They retain full power for almost 10 years – the loss is just ~1% (based on simulations),
- They feature excellent resistance to magnetism drop as a result of external fields,
- In other words, due to the smooth finish of silver, the element looks attractive,
- Neodymium magnets create maximum magnetic induction on a contact point, which allows for strong attraction,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
- Possibility of custom machining as well as adapting to defined requirements,
- Wide application in advanced technology sectors – they find application in mass storage devices, drive modules, precision medical tools, as well as modern systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited possibility of making threads in the magnet and complex forms - recommended is cover - magnetic holder.
- Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical when they are in the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum lifting force for a neodymium magnet – what contributes to it?
- with the application of a yoke made of special test steel, guaranteeing maximum field concentration
- possessing a thickness of minimum 10 mm to ensure full flux closure
- characterized by even structure
- without the slightest air gap between the magnet and steel
- under axial force vector (90-degree angle)
- at ambient temperature approx. 20 degrees Celsius
Practical aspects of lifting capacity – factors
- Clearance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
- Base massiveness – insufficiently thick steel does not accept the full field, causing part of the flux to be wasted into the air.
- Material type – the best choice is high-permeability steel. Cast iron may attract less.
- Plate texture – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
- Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity was assessed with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate reduces the holding force.
Safety rules for work with NdFeB magnets
This is not a toy
Absolutely store magnets out of reach of children. Choking hazard is high, and the effects of magnets connecting inside the body are fatal.
Sensitization to coating
Studies show that nickel (the usual finish) is a common allergen. If your skin reacts to metals, avoid direct skin contact or select versions in plastic housing.
Fire warning
Powder produced during grinding of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.
Respect the power
Use magnets consciously. Their powerful strength can surprise even professionals. Be vigilant and do not underestimate their power.
Eye protection
NdFeB magnets are ceramic materials, meaning they are very brittle. Clashing of two magnets will cause them breaking into small pieces.
ICD Warning
Individuals with a pacemaker have to keep an large gap from magnets. The magnetic field can disrupt the operation of the implant.
Bone fractures
Danger of trauma: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Threat to navigation
A powerful magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Do not bring magnets near a smartphone to avoid damaging the sensors.
Electronic hazard
Powerful magnetic fields can destroy records on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.
Power loss in heat
Regular neodymium magnets (grade N) lose power when the temperature goes above 80°C. Damage is permanent.
