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 of the product - 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 |
Technical analysis of the magnet - data
Presented information represent the direct effect of a engineering analysis. Results are based on models for the class Nd2Fe14B. Operational parameters may differ. Treat these data as a supplementary guide during assembly planning.
Table 1: Static pull force (pull vs distance) - power drop
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 pounds
16720.0 g / 164.0 N
|
dangerous! |
| 1 mm |
4664 Gs
466.4 mT
|
12.46 kg / 27.48 pounds
12464.6 g / 122.3 N
|
dangerous! |
| 2 mm |
3970 Gs
397.0 mT
|
9.03 kg / 19.90 pounds
9028.7 g / 88.6 N
|
strong |
| 3 mm |
3362 Gs
336.2 mT
|
6.48 kg / 14.28 pounds
6476.4 g / 63.5 N
|
strong |
| 5 mm |
2432 Gs
243.2 mT
|
3.39 kg / 7.47 pounds
3388.5 g / 33.2 N
|
strong |
| 10 mm |
1220 Gs
122.0 mT
|
0.85 kg / 1.88 pounds
853.2 g / 8.4 N
|
weak grip |
| 15 mm |
703 Gs
70.3 mT
|
0.28 kg / 0.62 pounds
282.9 g / 2.8 N
|
weak grip |
| 20 mm |
440 Gs
44.0 mT
|
0.11 kg / 0.24 pounds
111.1 g / 1.1 N
|
weak grip |
| 30 mm |
203 Gs
20.3 mT
|
0.02 kg / 0.05 pounds
23.6 g / 0.2 N
|
weak grip |
| 50 mm |
64 Gs
6.4 mT
|
0.00 kg / 0.01 pounds
2.4 g / 0.0 N
|
weak grip |
Table 2: Vertical force (wall)
MPL 40x10x18 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
3.34 kg / 7.37 pounds
3344.0 g / 32.8 N
|
| 1 mm | Stal (~0.2) |
2.49 kg / 5.49 pounds
2492.0 g / 24.4 N
|
| 2 mm | Stal (~0.2) |
1.81 kg / 3.98 pounds
1806.0 g / 17.7 N
|
| 3 mm | Stal (~0.2) |
1.30 kg / 2.86 pounds
1296.0 g / 12.7 N
|
| 5 mm | Stal (~0.2) |
0.68 kg / 1.49 pounds
678.0 g / 6.7 N
|
| 10 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
| 15 mm | Stal (~0.2) |
0.06 kg / 0.12 pounds
56.0 g / 0.5 N
|
| 20 mm | Stal (~0.2) |
0.02 kg / 0.05 pounds
22.0 g / 0.2 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 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 (shearing) - behavior on slippery surfaces
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 pounds
5016.0 g / 49.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
3.34 kg / 7.37 pounds
3344.0 g / 32.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.67 kg / 3.69 pounds
1672.0 g / 16.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
8.36 kg / 18.43 pounds
8360.0 g / 82.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 40x10x18 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.84 kg / 1.84 pounds
836.0 g / 8.2 N
|
| 1 mm |
|
2.09 kg / 4.61 pounds
2090.0 g / 20.5 N
|
| 2 mm |
|
4.18 kg / 9.22 pounds
4180.0 g / 41.0 N
|
| 3 mm |
|
6.27 kg / 13.82 pounds
6270.0 g / 61.5 N
|
| 5 mm |
|
10.45 kg / 23.04 pounds
10450.0 g / 102.5 N
|
| 10 mm |
|
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
|
| 11 mm |
|
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
|
| 12 mm |
|
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 40x10x18 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
16.72 kg / 36.86 pounds
16720.0 g / 164.0 N
|
OK |
| 40 °C | -2.2% |
16.35 kg / 36.05 pounds
16352.2 g / 160.4 N
|
OK |
| 60 °C | -4.4% |
15.98 kg / 35.24 pounds
15984.3 g / 156.8 N
|
OK |
| 80 °C | -6.6% |
15.62 kg / 34.43 pounds
15616.5 g / 153.2 N
|
|
| 100 °C | -28.8% |
11.90 kg / 26.25 pounds
11904.6 g / 116.8 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 40x10x18 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
71.96 kg / 158.65 pounds
5 928 Gs
|
10.79 kg / 23.80 pounds
10794 g / 105.9 N
|
N/A |
| 1 mm |
62.49 kg / 137.76 pounds
10 068 Gs
|
9.37 kg / 20.66 pounds
9373 g / 91.9 N
|
56.24 kg / 123.98 pounds
~0 Gs
|
| 2 mm |
53.65 kg / 118.27 pounds
9 328 Gs
|
8.05 kg / 17.74 pounds
8047 g / 78.9 N
|
48.28 kg / 106.44 pounds
~0 Gs
|
| 3 mm |
45.76 kg / 100.88 pounds
8 615 Gs
|
6.86 kg / 15.13 pounds
6864 g / 67.3 N
|
41.18 kg / 90.79 pounds
~0 Gs
|
| 5 mm |
32.92 kg / 72.58 pounds
7 308 Gs
|
4.94 kg / 10.89 pounds
4938 g / 48.4 N
|
29.63 kg / 65.32 pounds
~0 Gs
|
| 10 mm |
14.58 kg / 32.15 pounds
4 864 Gs
|
2.19 kg / 4.82 pounds
2188 g / 21.5 N
|
13.13 kg / 28.94 pounds
~0 Gs
|
| 20 mm |
3.67 kg / 8.10 pounds
2 441 Gs
|
0.55 kg / 1.21 pounds
551 g / 5.4 N
|
3.30 kg / 7.29 pounds
~0 Gs
|
| 50 mm |
0.21 kg / 0.46 pounds
585 Gs
|
0.03 kg / 0.07 pounds
32 g / 0.3 N
|
0.19 kg / 0.42 pounds
~0 Gs
|
| 60 mm |
0.10 kg / 0.22 pounds
406 Gs
|
0.02 kg / 0.03 pounds
15 g / 0.1 N
|
0.09 kg / 0.20 pounds
~0 Gs
|
| 70 mm |
0.05 kg / 0.12 pounds
293 Gs
|
0.01 kg / 0.02 pounds
8 g / 0.1 N
|
0.05 kg / 0.10 pounds
~0 Gs
|
| 80 mm |
0.03 kg / 0.06 pounds
217 Gs
|
0.00 kg / 0.01 pounds
4 g / 0.0 N
|
0.03 kg / 0.06 pounds
~0 Gs
|
| 90 mm |
0.02 kg / 0.04 pounds
165 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.03 pounds
~0 Gs
|
| 100 mm |
0.01 kg / 0.02 pounds
128 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
Table 7: Safety (HSE) (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 |
| Timepiece | 20 Gs (2.0 mT) | 8.0 cm |
| Phone / Smartphone | 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: Impact energy (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: Anti-corrosion coating 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 (Flux)
MPL 40x10x18 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 21 285 Mx | 212.9 µWb |
| Pc Coefficient | 0.79 | High (Stable) |
Table 11: Hydrostatics and buoyancy
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. Sliding resistance
*Warning: On a vertical wall, the magnet holds merely approx. 20-30% of its nominal pull.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) drastically reduces the holding force.
3. Temperature resistance
*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) = 0.79
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also proposals
Strengths as well as weaknesses of Nd2Fe14B magnets.
Advantages
- They do not lose strength, even after nearly 10 years – the reduction in power is only ~1% (theoretically),
- They retain their magnetic properties even under close interference source,
- In other words, due to the glossy surface of nickel, the element is aesthetically pleasing,
- They show high magnetic induction at the operating surface, which affects their effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
- Possibility of accurate forming and modifying to complex needs,
- Versatile presence in advanced technology sectors – they are utilized in HDD drives, electromotive mechanisms, advanced medical instruments, as well as industrial machines.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons
- They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength 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
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We recommend cover - magnetic holder, due to difficulties in creating threads inside the magnet and complicated shapes.
- Possible danger resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the context of child health protection. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Lifting parameters
Best holding force of the magnet in ideal parameters – what contributes to it?
- using a plate made of high-permeability steel, functioning as a ideal flux conductor
- possessing a thickness of minimum 10 mm to ensure full flux closure
- with a plane cleaned and smooth
- with zero gap (without impurities)
- under vertical force vector (90-degree angle)
- at standard ambient temperature
Determinants of lifting force in real conditions
- Clearance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet holds significantly lower power (typically approx. 20-30% of nominal force).
- Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
- Steel type – low-carbon steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
- Surface structure – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
- Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.
Lifting capacity was assessed with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Safe handling of NdFeB magnets
Heat warning
Control the heat. Exposing the magnet to high heat will permanently weaken its properties and strength.
Pinching danger
Danger of trauma: The pulling power is so great that it can cause hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Protective goggles
Protect your eyes. Magnets can explode upon violent connection, launching sharp fragments into the air. We recommend safety glasses.
Fire risk
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
Handling rules
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Cards and drives
Do not bring magnets close to a purse, laptop, or screen. The magnetic field can permanently damage these devices and wipe information from cards.
Precision electronics
Be aware: neodymium magnets produce a field that confuses sensitive sensors. Maintain a separation from your mobile, tablet, and GPS.
Life threat
Patients with a pacemaker must keep an large gap from magnets. The magnetic field can stop the functioning of the life-saving device.
Avoid contact if allergic
Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease working with magnets and use protective gear.
Product not for children
Product intended for adults. Tiny parts pose a choking risk, leading to serious injuries. Keep out of reach of children and animals.
