MPL 40x10x18 / N38 - lamellar magnet
lamellar magnet
Catalog no 020149
GTIN/EAN: 5906301811558
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
18 mm [±0,1 mm]
Weight
54 g
Magnetization Direction
→ diametrical
Load capacity
16.72 kg / 164.01 N
Magnetic Induction
540.48 mT / 5405 Gs
Coating
[NiCuNi] Nickel
18.45 ZŁ with VAT / pcs + price for transport
15.00 ZŁ net + 23% VAT / pcs
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Technical details - MPL 40x10x18 / N38 - lamellar magnet
Specification / characteristics - MPL 40x10x18 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020149 |
| GTIN/EAN | 5906301811558 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 18 mm [±0,1 mm] |
| Weight | 54 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 16.72 kg / 164.01 N |
| Magnetic Induction ~ ? | 540.48 mT / 5405 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 - data
Presented values are the direct effect of a engineering analysis. Values are based on models for the material Nd2Fe14B. Operational conditions might slightly deviate from the simulation results. Treat these data as a preliminary roadmap for designers.
Table 1: Static force (pull vs distance) - interaction chart
MPL 40x10x18 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5402 Gs
540.2 mT
|
16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
|
crushing |
| 1 mm |
4664 Gs
466.4 mT
|
12.46 kg / 27.48 lbs
12464.6 g / 122.3 N
|
crushing |
| 2 mm |
3970 Gs
397.0 mT
|
9.03 kg / 19.90 lbs
9028.7 g / 88.6 N
|
strong |
| 3 mm |
3362 Gs
336.2 mT
|
6.48 kg / 14.28 lbs
6476.4 g / 63.5 N
|
strong |
| 5 mm |
2432 Gs
243.2 mT
|
3.39 kg / 7.47 lbs
3388.5 g / 33.2 N
|
strong |
| 10 mm |
1220 Gs
122.0 mT
|
0.85 kg / 1.88 lbs
853.2 g / 8.4 N
|
low risk |
| 15 mm |
703 Gs
70.3 mT
|
0.28 kg / 0.62 lbs
282.9 g / 2.8 N
|
low risk |
| 20 mm |
440 Gs
44.0 mT
|
0.11 kg / 0.24 lbs
111.1 g / 1.1 N
|
low risk |
| 30 mm |
203 Gs
20.3 mT
|
0.02 kg / 0.05 lbs
23.6 g / 0.2 N
|
low risk |
| 50 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.01 lbs
2.4 g / 0.0 N
|
low risk |
Table 2: Slippage force (vertical surface)
MPL 40x10x18 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
|
| 1 mm | Stal (~0.2) |
2.49 kg / 5.49 lbs
2492.0 g / 24.4 N
|
| 2 mm | Stal (~0.2) |
1.81 kg / 3.98 lbs
1806.0 g / 17.7 N
|
| 3 mm | Stal (~0.2) |
1.30 kg / 2.86 lbs
1296.0 g / 12.7 N
|
| 5 mm | Stal (~0.2) |
0.68 kg / 1.49 lbs
678.0 g / 6.7 N
|
| 10 mm | Stal (~0.2) |
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
|
| 15 mm | Stal (~0.2) |
0.06 kg / 0.12 lbs
56.0 g / 0.5 N
|
| 20 mm | Stal (~0.2) |
0.02 kg / 0.05 lbs
22.0 g / 0.2 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 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 40x10x18 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
5.02 kg / 11.06 lbs
5016.0 g / 49.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.34 kg / 7.37 lbs
3344.0 g / 32.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.67 kg / 3.69 lbs
1672.0 g / 16.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
8.36 kg / 18.43 lbs
8360.0 g / 82.0 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 40x10x18 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.84 kg / 1.84 lbs
836.0 g / 8.2 N
|
| 1 mm |
|
2.09 kg / 4.61 lbs
2090.0 g / 20.5 N
|
| 2 mm |
|
4.18 kg / 9.22 lbs
4180.0 g / 41.0 N
|
| 3 mm |
|
6.27 kg / 13.82 lbs
6270.0 g / 61.5 N
|
| 5 mm |
|
10.45 kg / 23.04 lbs
10450.0 g / 102.5 N
|
| 10 mm |
|
16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
|
| 11 mm |
|
16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
|
| 12 mm |
|
16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 40x10x18 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
16.72 kg / 36.86 lbs
16720.0 g / 164.0 N
|
OK |
| 40 °C | -2.2% |
16.35 kg / 36.05 lbs
16352.2 g / 160.4 N
|
OK |
| 60 °C | -4.4% |
15.98 kg / 35.24 lbs
15984.3 g / 156.8 N
|
OK |
| 80 °C | -6.6% |
15.62 kg / 34.43 lbs
15616.5 g / 153.2 N
|
|
| 100 °C | -28.8% |
11.90 kg / 26.25 lbs
11904.6 g / 116.8 N
|
Table 6: Magnet-Magnet interaction (attraction) - field range
MPL 40x10x18 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
71.96 kg / 158.65 lbs
5 928 Gs
|
10.79 kg / 23.80 lbs
10794 g / 105.9 N
|
N/A |
| 1 mm |
62.49 kg / 137.76 lbs
10 068 Gs
|
9.37 kg / 20.66 lbs
9373 g / 91.9 N
|
56.24 kg / 123.98 lbs
~0 Gs
|
| 2 mm |
53.65 kg / 118.27 lbs
9 328 Gs
|
8.05 kg / 17.74 lbs
8047 g / 78.9 N
|
48.28 kg / 106.44 lbs
~0 Gs
|
| 3 mm |
45.76 kg / 100.88 lbs
8 615 Gs
|
6.86 kg / 15.13 lbs
6864 g / 67.3 N
|
41.18 kg / 90.79 lbs
~0 Gs
|
| 5 mm |
32.92 kg / 72.58 lbs
7 308 Gs
|
4.94 kg / 10.89 lbs
4938 g / 48.4 N
|
29.63 kg / 65.32 lbs
~0 Gs
|
| 10 mm |
14.58 kg / 32.15 lbs
4 864 Gs
|
2.19 kg / 4.82 lbs
2188 g / 21.5 N
|
13.13 kg / 28.94 lbs
~0 Gs
|
| 20 mm |
3.67 kg / 8.10 lbs
2 441 Gs
|
0.55 kg / 1.21 lbs
551 g / 5.4 N
|
3.30 kg / 7.29 lbs
~0 Gs
|
| 50 mm |
0.21 kg / 0.46 lbs
585 Gs
|
0.03 kg / 0.07 lbs
32 g / 0.3 N
|
0.19 kg / 0.42 lbs
~0 Gs
|
| 60 mm |
0.10 kg / 0.22 lbs
406 Gs
|
0.02 kg / 0.03 lbs
15 g / 0.1 N
|
0.09 kg / 0.20 lbs
~0 Gs
|
| 70 mm |
0.05 kg / 0.12 lbs
293 Gs
|
0.01 kg / 0.02 lbs
8 g / 0.1 N
|
0.05 kg / 0.10 lbs
~0 Gs
|
| 80 mm |
0.03 kg / 0.06 lbs
217 Gs
|
0.00 kg / 0.01 lbs
4 g / 0.0 N
|
0.03 kg / 0.06 lbs
~0 Gs
|
| 90 mm |
0.02 kg / 0.04 lbs
165 Gs
|
0.00 kg / 0.01 lbs
3 g / 0.0 N
|
0.02 kg / 0.03 lbs
~0 Gs
|
| 100 mm |
0.01 kg / 0.02 lbs
128 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MPL 40x10x18 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 13.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 10.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 8.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 6.5 cm |
| Remote | 50 Gs (5.0 mT) | 6.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.0 cm |
Table 8: Dynamics (cracking risk) - warning
MPL 40x10x18 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
18.30 km/h
(5.08 m/s)
|
0.70 J | |
| 30 mm |
30.76 km/h
(8.55 m/s)
|
1.97 J | |
| 50 mm |
39.69 km/h
(11.02 m/s)
|
3.28 J | |
| 100 mm |
56.12 km/h
(15.59 m/s)
|
6.56 J |
Table 9: Coating parameters (durability)
MPL 40x10x18 / 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 (Pc)
MPL 40x10x18 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 21 285 Mx | 212.9 µWb |
| Pc Coefficient | 0.79 | High (Stable) |
Table 11: Submerged application
MPL 40x10x18 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 16.72 kg | Standard |
| Water (riverbed) |
19.14 kg
(+2.42 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly weakens the holding force.
3. Heat tolerance
*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) = 0.79
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.
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 |
View also proposals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Strengths
- They retain attractive force for almost ten years – the loss is just ~1% (based on simulations),
- Neodymium magnets are distinguished by remarkably resistant to loss of magnetic properties caused by external interference,
- A magnet with a smooth nickel surface has better aesthetics,
- Magnets have maximum magnetic induction on the working surface,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Possibility of accurate modeling and modifying to specific applications,
- Universal use in future technologies – they are utilized in hard drives, electric drive systems, diagnostic systems, and multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Weaknesses
- They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
- Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic mount.
- Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. Furthermore, small elements of these products can be problematic in diagnostics medical when they are in the body.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Holding force characteristics
Maximum lifting force for a neodymium magnet – what it depends on?
- using a plate made of mild steel, functioning as a circuit closing element
- whose transverse dimension equals approx. 10 mm
- characterized by smoothness
- with zero gap (without paint)
- during pulling in a direction vertical to the plane
- in temp. approx. 20°C
Impact of factors on magnetic holding capacity in practice
- Clearance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Base massiveness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted to the other side.
- Steel type – low-carbon steel attracts best. Higher carbon content reduce magnetic permeability and lifting capacity.
- Smoothness – full contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
- Operating temperature – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance between the magnet and the plate lowers the load capacity.
Safe handling of neodymium magnets
Electronic hazard
Avoid bringing magnets near a purse, laptop, or screen. The magnetism can permanently damage these devices and erase data from cards.
Life threat
Warning for patients: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or request help to handle the magnets.
Fire risk
Drilling and cutting of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is difficult to extinguish.
This is not a toy
Strictly store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets clamping inside the body are life-threatening.
Conscious usage
Handle magnets consciously. Their huge power can shock even experienced users. Plan your moves and do not underestimate their power.
Precision electronics
GPS units and mobile phones are extremely sensitive to magnetism. Close proximity with a powerful NdFeB magnet can decalibrate the internal compass in your phone.
Bone fractures
Pinching hazard: The attraction force is so great that it can cause blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Permanent damage
Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its properties and pulling force.
Sensitization to coating
Nickel alert: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, immediately stop handling magnets and wear gloves.
Magnet fragility
Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
