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 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 simulation of the assembly - technical parameters
These values are the direct effect of a engineering simulation. Values are based on models for the class Nd2Fe14B. Operational performance may differ. Use these data as a preliminary roadmap for designers.
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 pounds
2330.0 g / 22.9 N
|
warning |
| 1 mm |
2599 Gs
259.9 mT
|
0.51 kg / 1.12 pounds
506.6 g / 5.0 N
|
low risk |
| 2 mm |
1392 Gs
139.2 mT
|
0.15 kg / 0.32 pounds
145.3 g / 1.4 N
|
low risk |
| 3 mm |
879 Gs
87.9 mT
|
0.06 kg / 0.13 pounds
58.0 g / 0.6 N
|
low risk |
| 5 mm |
454 Gs
45.4 mT
|
0.02 kg / 0.03 pounds
15.5 g / 0.2 N
|
low risk |
| 10 mm |
155 Gs
15.5 mT
|
0.00 kg / 0.00 pounds
1.8 g / 0.0 N
|
low risk |
| 15 mm |
72 Gs
7.2 mT
|
0.00 kg / 0.00 pounds
0.4 g / 0.0 N
|
low risk |
| 20 mm |
39 Gs
3.9 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
low risk |
| 30 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
low risk |
Table 2: Vertical force (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 pounds
466.0 g / 4.6 N
|
| 1 mm | Stal (~0.2) |
0.10 kg / 0.22 pounds
102.0 g / 1.0 N
|
| 2 mm | Stal (~0.2) |
0.03 kg / 0.07 pounds
30.0 g / 0.3 N
|
| 3 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 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) - 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 pounds
699.0 g / 6.9 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.47 kg / 1.03 pounds
466.0 g / 4.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 25x2x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.23 kg / 0.51 pounds
233.0 g / 2.3 N
|
| 1 mm |
|
0.58 kg / 1.28 pounds
582.5 g / 5.7 N
|
| 2 mm |
|
1.17 kg / 2.57 pounds
1165.0 g / 11.4 N
|
| 3 mm |
|
1.75 kg / 3.85 pounds
1747.5 g / 17.1 N
|
| 5 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 10 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 11 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
| 12 mm |
|
2.33 kg / 5.14 pounds
2330.0 g / 22.9 N
|
Table 5: Thermal stability (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 pounds
2330.0 g / 22.9 N
|
OK |
| 40 °C | -2.2% |
2.28 kg / 5.02 pounds
2278.7 g / 22.4 N
|
OK |
| 60 °C | -4.4% |
2.23 kg / 4.91 pounds
2227.5 g / 21.9 N
|
OK |
| 80 °C | -6.6% |
2.18 kg / 4.80 pounds
2176.2 g / 21.3 N
|
|
| 100 °C | -28.8% |
1.66 kg / 3.66 pounds
1659.0 g / 16.3 N
|
Table 6: Two magnets (repulsion) - field collision
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 pounds
5 924 Gs
|
1.44 kg / 3.17 pounds
1437 g / 14.1 N
|
N/A |
| 1 mm |
4.52 kg / 9.97 pounds
7 659 Gs
|
0.68 kg / 1.49 pounds
678 g / 6.7 N
|
4.07 kg / 8.97 pounds
~0 Gs
|
| 2 mm |
2.08 kg / 4.59 pounds
5 198 Gs
|
0.31 kg / 0.69 pounds
312 g / 3.1 N
|
1.87 kg / 4.13 pounds
~0 Gs
|
| 3 mm |
1.06 kg / 2.34 pounds
3 708 Gs
|
0.16 kg / 0.35 pounds
159 g / 1.6 N
|
0.95 kg / 2.10 pounds
~0 Gs
|
| 5 mm |
0.37 kg / 0.81 pounds
2 179 Gs
|
0.05 kg / 0.12 pounds
55 g / 0.5 N
|
0.33 kg / 0.73 pounds
~0 Gs
|
| 10 mm |
0.06 kg / 0.14 pounds
909 Gs
|
0.01 kg / 0.02 pounds
10 g / 0.1 N
|
0.06 kg / 0.13 pounds
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 pounds
311 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 pounds
46 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 pounds
29 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
20 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
14 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
10 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
8 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (implants) - 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 |
| Mechanical watch | 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: Collisions (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: Anti-corrosion coating 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: Electrical 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: 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. Shear force
*Caution: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. computer case) drastically limits the holding force.
3. Power loss vs temp
*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) = 0.76
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other deals
Pros and cons of rare earth magnets.
Pros
- They retain magnetic properties for around 10 years – the drop is just ~1% (in theory),
- They are extremely resistant to demagnetization induced by presence of other magnetic fields,
- By applying a reflective layer of silver, the element has an elegant look,
- Magnets are characterized by impressive magnetic induction on the outer layer,
- Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to flexibility in shaping and the capacity to customize to specific needs,
- Fundamental importance in innovative solutions – they are used in mass storage devices, electric motors, medical equipment, as well as other advanced devices.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which enables their usage in small systems
Cons
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only secures them against impacts but also raises their 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.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
- Due to limitations in creating threads and complex shapes in magnets, we propose using casing - magnetic mount.
- Possible danger to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, tiny parts of these products can complicate diagnosis medical in case of swallowing.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum holding power of the magnet – what it depends on?
- using a sheet made of high-permeability steel, acting as a circuit closing element
- possessing a thickness of minimum 10 mm to avoid saturation
- with a surface free of scratches
- without any insulating layer between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- in temp. approx. 20°C
Determinants of practical lifting force of a magnet
- Distance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, 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. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Plate material – mild steel gives the best results. Alloy admixtures decrease magnetic properties and lifting capacity.
- Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
- Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.
Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under vertically applied force, whereas under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Warnings
Cards and drives
Avoid bringing magnets near a wallet, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.
Fire risk
Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Keep away from electronics
Be aware: rare earth magnets generate a field that interferes with sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.
Bone fractures
Risk of injury: The pulling power is so great that it can cause blood blisters, pinching, and even bone fractures. Use thick gloves.
Magnet fragility
Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. Wear goggles.
Pacemakers
People with a pacemaker should keep an absolute distance from magnets. The magnetic field can interfere with the operation of the life-saving device.
Swallowing risk
Always keep magnets away from children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are tragic.
Power loss in heat
Avoid heat. Neodymium magnets are sensitive to temperature. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
Caution required
Handle magnets with awareness. Their huge power can shock even professionals. Plan your moves and do not underestimate their force.
Nickel allergy
A percentage of the population experience a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Prolonged contact might lead to an allergic reaction. We strongly advise wear protective gloves.
