MPL 45x25x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020164
GTIN/EAN: 5906301811701
length
45 mm [±0,1 mm]
Width
25 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
84.38 g
Magnetization Direction
↑ axial
Load capacity
28.48 kg / 279.40 N
Magnetic Induction
306.29 mT / 3063 Gs
Coating
[NiCuNi] Nickel
35.01 ZŁ with VAT / pcs + price for transport
28.46 ZŁ net + 23% VAT / pcs
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Technical details - MPL 45x25x10 / N38 - lamellar magnet
Specification / characteristics - MPL 45x25x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020164 |
| GTIN/EAN | 5906301811701 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 45 mm [±0,1 mm] |
| Width | 25 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 84.38 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 28.48 kg / 279.40 N |
| Magnetic Induction ~ ? | 306.29 mT / 3063 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 modeling of the assembly - data
These data represent the outcome of a mathematical simulation. Results are based on models for the material Nd2Fe14B. Actual parameters may differ from theoretical values. Treat these data as a reference point when designing systems.
Table 1: Static force (pull vs gap) - power drop
MPL 45x25x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3062 Gs
306.2 mT
|
28.48 kg / 62.79 lbs
28480.0 g / 279.4 N
|
dangerous! |
| 1 mm |
2918 Gs
291.8 mT
|
25.86 kg / 57.00 lbs
25856.7 g / 253.7 N
|
dangerous! |
| 2 mm |
2760 Gs
276.0 mT
|
23.13 kg / 51.00 lbs
23133.2 g / 226.9 N
|
dangerous! |
| 3 mm |
2595 Gs
259.5 mT
|
20.45 kg / 45.08 lbs
20449.5 g / 200.6 N
|
dangerous! |
| 5 mm |
2261 Gs
226.1 mT
|
15.53 kg / 34.23 lbs
15525.8 g / 152.3 N
|
dangerous! |
| 10 mm |
1529 Gs
152.9 mT
|
7.10 kg / 15.64 lbs
7096.1 g / 69.6 N
|
warning |
| 15 mm |
1018 Gs
101.8 mT
|
3.15 kg / 6.94 lbs
3147.4 g / 30.9 N
|
warning |
| 20 mm |
688 Gs
68.8 mT
|
1.44 kg / 3.17 lbs
1439.4 g / 14.1 N
|
safe |
| 30 mm |
340 Gs
34.0 mT
|
0.35 kg / 0.77 lbs
350.8 g / 3.4 N
|
safe |
| 50 mm |
111 Gs
11.1 mT
|
0.04 kg / 0.08 lbs
37.1 g / 0.4 N
|
safe |
Table 2: Shear load (vertical surface)
MPL 45x25x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
5.70 kg / 12.56 lbs
5696.0 g / 55.9 N
|
| 1 mm | Stal (~0.2) |
5.17 kg / 11.40 lbs
5172.0 g / 50.7 N
|
| 2 mm | Stal (~0.2) |
4.63 kg / 10.20 lbs
4626.0 g / 45.4 N
|
| 3 mm | Stal (~0.2) |
4.09 kg / 9.02 lbs
4090.0 g / 40.1 N
|
| 5 mm | Stal (~0.2) |
3.11 kg / 6.85 lbs
3106.0 g / 30.5 N
|
| 10 mm | Stal (~0.2) |
1.42 kg / 3.13 lbs
1420.0 g / 13.9 N
|
| 15 mm | Stal (~0.2) |
0.63 kg / 1.39 lbs
630.0 g / 6.2 N
|
| 20 mm | Stal (~0.2) |
0.29 kg / 0.63 lbs
288.0 g / 2.8 N
|
| 30 mm | Stal (~0.2) |
0.07 kg / 0.15 lbs
70.0 g / 0.7 N
|
| 50 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
8.0 g / 0.1 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 45x25x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
8.54 kg / 18.84 lbs
8544.0 g / 83.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
5.70 kg / 12.56 lbs
5696.0 g / 55.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
2.85 kg / 6.28 lbs
2848.0 g / 27.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
14.24 kg / 31.39 lbs
14240.0 g / 139.7 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 45x25x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.42 kg / 3.14 lbs
1424.0 g / 14.0 N
|
| 1 mm |
|
3.56 kg / 7.85 lbs
3560.0 g / 34.9 N
|
| 2 mm |
|
7.12 kg / 15.70 lbs
7120.0 g / 69.8 N
|
| 3 mm |
|
10.68 kg / 23.55 lbs
10680.0 g / 104.8 N
|
| 5 mm |
|
17.80 kg / 39.24 lbs
17800.0 g / 174.6 N
|
| 10 mm |
|
28.48 kg / 62.79 lbs
28480.0 g / 279.4 N
|
| 11 mm |
|
28.48 kg / 62.79 lbs
28480.0 g / 279.4 N
|
| 12 mm |
|
28.48 kg / 62.79 lbs
28480.0 g / 279.4 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 45x25x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
28.48 kg / 62.79 lbs
28480.0 g / 279.4 N
|
OK |
| 40 °C | -2.2% |
27.85 kg / 61.41 lbs
27853.4 g / 273.2 N
|
OK |
| 60 °C | -4.4% |
27.23 kg / 60.02 lbs
27226.9 g / 267.1 N
|
|
| 80 °C | -6.6% |
26.60 kg / 58.64 lbs
26600.3 g / 260.9 N
|
|
| 100 °C | -28.8% |
20.28 kg / 44.70 lbs
20277.8 g / 198.9 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 45x25x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
65.04 kg / 143.40 lbs
4 590 Gs
|
9.76 kg / 21.51 lbs
9757 g / 95.7 N
|
N/A |
| 1 mm |
62.12 kg / 136.95 lbs
5 985 Gs
|
9.32 kg / 20.54 lbs
9318 g / 91.4 N
|
55.91 kg / 123.25 lbs
~0 Gs
|
| 2 mm |
59.05 kg / 130.19 lbs
5 836 Gs
|
8.86 kg / 19.53 lbs
8858 g / 86.9 N
|
53.15 kg / 117.17 lbs
~0 Gs
|
| 3 mm |
55.95 kg / 123.34 lbs
5 680 Gs
|
8.39 kg / 18.50 lbs
8392 g / 82.3 N
|
50.35 kg / 111.01 lbs
~0 Gs
|
| 5 mm |
49.74 kg / 109.66 lbs
5 356 Gs
|
7.46 kg / 16.45 lbs
7461 g / 73.2 N
|
44.77 kg / 98.70 lbs
~0 Gs
|
| 10 mm |
35.46 kg / 78.17 lbs
4 522 Gs
|
5.32 kg / 11.73 lbs
5319 g / 52.2 N
|
31.91 kg / 70.36 lbs
~0 Gs
|
| 20 mm |
16.21 kg / 35.73 lbs
3 057 Gs
|
2.43 kg / 5.36 lbs
2431 g / 23.8 N
|
14.59 kg / 32.16 lbs
~0 Gs
|
| 50 mm |
1.58 kg / 3.48 lbs
955 Gs
|
0.24 kg / 0.52 lbs
237 g / 2.3 N
|
1.42 kg / 3.14 lbs
~0 Gs
|
| 60 mm |
0.80 kg / 1.77 lbs
680 Gs
|
0.12 kg / 0.26 lbs
120 g / 1.2 N
|
0.72 kg / 1.59 lbs
~0 Gs
|
| 70 mm |
0.43 kg / 0.94 lbs
497 Gs
|
0.06 kg / 0.14 lbs
64 g / 0.6 N
|
0.38 kg / 0.85 lbs
~0 Gs
|
| 80 mm |
0.24 kg / 0.53 lbs
372 Gs
|
0.04 kg / 0.08 lbs
36 g / 0.4 N
|
0.22 kg / 0.47 lbs
~0 Gs
|
| 90 mm |
0.14 kg / 0.31 lbs
284 Gs
|
0.02 kg / 0.05 lbs
21 g / 0.2 N
|
0.13 kg / 0.28 lbs
~0 Gs
|
| 100 mm |
0.08 kg / 0.19 lbs
221 Gs
|
0.01 kg / 0.03 lbs
13 g / 0.1 N
|
0.08 kg / 0.17 lbs
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MPL 45x25x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 16.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 12.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 10.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 7.5 cm |
| Car key | 50 Gs (5.0 mT) | 7.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 45x25x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.22 km/h
(5.89 m/s)
|
1.47 J | |
| 30 mm |
32.34 km/h
(8.98 m/s)
|
3.40 J | |
| 50 mm |
41.46 km/h
(11.52 m/s)
|
5.60 J | |
| 100 mm |
58.59 km/h
(16.28 m/s)
|
11.18 J |
Table 9: Anti-corrosion coating durability
MPL 45x25x10 / 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 45x25x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 35 829 Mx | 358.3 µWb |
| Pc Coefficient | 0.36 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 45x25x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 28.48 kg | Standard |
| Water (riverbed) |
32.61 kg
(+4.13 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical surface, the magnet holds merely ~20% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits 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) = 0.36
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 |
Other offers
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They retain attractive force for almost 10 years – the drop is just ~1% (according to analyses),
- They maintain their magnetic properties even under close interference source,
- A magnet with a smooth nickel surface has better aesthetics,
- Magnetic induction on the working part of the magnet is very high,
- 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...
- Possibility of custom modeling and optimizing to atypical requirements,
- Huge importance in future technologies – they are used in data components, electromotive mechanisms, medical devices, also multitasking production systems.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Weaknesses
- At strong impacts they can break, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- When exposed to humidity, magnets start to rust. To use them in conditions 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 nuts and complex shapes in magnets, we recommend using casing - magnetic holder.
- Health risk resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these devices are able to complicate diagnosis medical after entering the body.
- Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications
Pull force analysis
Maximum lifting force for a neodymium magnet – what it depends on?
- with the contact of a yoke made of low-carbon steel, guaranteeing maximum field concentration
- with a cross-section minimum 10 mm
- with a plane free of scratches
- under conditions of ideal adhesion (surface-to-surface)
- for force applied at a right angle (in the magnet axis)
- in neutral thermal conditions
Magnet lifting force in use – key factors
- Clearance – the presence of any layer (paint, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
- Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Warning for heart patients
People with a pacemaker have to keep an absolute distance from magnets. The magnetic field can stop the functioning of the life-saving device.
Threat to navigation
Navigation devices and mobile phones are extremely susceptible to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.
Mechanical processing
Fire hazard: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.
Eye protection
Watch out for shards. Magnets can fracture upon uncontrolled impact, launching shards into the air. Wear goggles.
Maximum temperature
Keep cool. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, look for HT versions (H, SH, UH).
Safe distance
Device Safety: Neodymium magnets can ruin payment cards and delicate electronics (heart implants, medical aids, timepieces).
Handling guide
Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Be predictive.
Keep away from children
Only for adults. Tiny parts can be swallowed, causing serious injuries. Store out of reach of children and animals.
Skin irritation risks
It is widely known that nickel (the usual finish) is a strong allergen. If your skin reacts to metals, refrain from touching magnets with bare hands or choose versions in plastic housing.
Crushing force
Big blocks can break fingers instantly. Under no circumstances put your hand betwixt two attracting surfaces.
