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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Detailed specification - 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 |
Technical modeling of the magnet - technical parameters
Presented values represent the outcome of a engineering calculation. Values rely on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ. Please consider these data as a reference point when designing systems.
Table 1: Static force (pull vs distance) - 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
|
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 (wall)
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: Wall mounting (sliding) - behavior on slippery surfaces
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: Thermal stability (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: Magnet-Magnet interaction (repulsion) - field collision
MPL 25x2x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral 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: Hazards (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 |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 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: Impact energy (cracking risk) - collision effects
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: Hydrostatics and buoyancy
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 surface, the magnet retains just ~20% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Thermal stability
*For N38 material, 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
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 |
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Strengths and weaknesses of Nd2Fe14B magnets.
Pros
- They have stable power, and over around ten years their performance decreases symbolically – ~1% (in testing),
- Magnets perfectly resist against loss of magnetization caused by foreign field sources,
- By covering with a reflective layer of nickel, the element presents 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 are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- In view of the ability of flexible forming and adaptation to specialized requirements, NdFeB magnets can be modeled in a broad palette of shapes and sizes, which expands the range of possible applications,
- Fundamental importance in future technologies – they are commonly used in magnetic memories, electric motors, advanced medical instruments, also industrial machines.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic holder.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, tiny parts of these products are able to complicate diagnosis medical when they are in the body.
- Due to complex production process, their price is higher than average,
Lifting parameters
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
- whose thickness reaches at least 10 mm
- with a surface free of scratches
- without the slightest air gap between the magnet and steel
- under vertical application of breakaway force (90-degree angle)
- at room temperature
Practical lifting capacity: influencing factors
- Gap (between the magnet and the metal), because even a tiny distance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
- Metal type – not every steel reacts the same. High carbon content weaken the interaction with the magnet.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
- Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a slight gap between the magnet’s surface and the plate decreases the holding force.
Warnings
Beware of splinters
NdFeB magnets are sintered ceramics, which means they are prone to chipping. Clashing of two magnets leads to them cracking into shards.
Physical harm
Big blocks can crush fingers instantly. Never put your hand between two attracting surfaces.
Safe operation
Handle magnets consciously. Their huge power can surprise even professionals. Plan your moves and respect their force.
Phone sensors
Note: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your phone, device, and GPS.
Warning for allergy sufferers
Medical facts indicate that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, avoid direct skin contact and choose encased magnets.
Fire warning
Powder produced during cutting of magnets is self-igniting. Do not drill into magnets unless you are an expert.
Do not give to children
Only for adults. Small elements pose a choking risk, leading to intestinal necrosis. Store away from children and animals.
Warning for heart patients
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.
Electronic hazard
Intense magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Stay away of at least 10 cm.
Do not overheat magnets
Regular neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. The loss of strength is permanent.
