MPL 40x10x4 / N38 - lamellar magnet
lamellar magnet
Catalog no 020150
GTIN/EAN: 5906301811565
length
40 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
12 g
Magnetization Direction
↑ axial
Load capacity
9.31 kg / 91.33 N
Magnetic Induction
275.57 mT / 2756 Gs
Coating
[NiCuNi] Nickel
4.87 ZŁ with VAT / pcs + price for transport
3.96 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical parameters - MPL 40x10x4 / N38 - lamellar magnet
Specification / characteristics - MPL 40x10x4 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020150 |
| GTIN/EAN | 5906301811565 |
| 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 | 4 mm [±0,1 mm] |
| Weight | 12 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 9.31 kg / 91.33 N |
| Magnetic Induction ~ ? | 275.57 mT / 2756 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 simulation of the magnet - report
The following information represent the outcome of a physical analysis. Results are based on models for the material Nd2Fe14B. Real-world parameters might slightly differ from theoretical values. Use these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (force vs distance) - power drop
MPL 40x10x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2755 Gs
275.5 mT
|
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
strong |
| 1 mm |
2413 Gs
241.3 mT
|
7.14 kg / 15.75 LBS
7143.1 g / 70.1 N
|
strong |
| 2 mm |
2044 Gs
204.4 mT
|
5.13 kg / 11.31 LBS
5128.9 g / 50.3 N
|
strong |
| 3 mm |
1703 Gs
170.3 mT
|
3.56 kg / 7.85 LBS
3559.5 g / 34.9 N
|
strong |
| 5 mm |
1173 Gs
117.3 mT
|
1.69 kg / 3.72 LBS
1688.2 g / 16.6 N
|
low risk |
| 10 mm |
522 Gs
52.2 mT
|
0.33 kg / 0.74 LBS
334.9 g / 3.3 N
|
low risk |
| 15 mm |
277 Gs
27.7 mT
|
0.09 kg / 0.21 LBS
94.2 g / 0.9 N
|
low risk |
| 20 mm |
163 Gs
16.3 mT
|
0.03 kg / 0.07 LBS
32.8 g / 0.3 N
|
low risk |
| 30 mm |
69 Gs
6.9 mT
|
0.01 kg / 0.01 LBS
5.8 g / 0.1 N
|
low risk |
| 50 mm |
19 Gs
1.9 mT
|
0.00 kg / 0.00 LBS
0.5 g / 0.0 N
|
low risk |
Table 2: Shear load (wall)
MPL 40x10x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
|
| 1 mm | Stal (~0.2) |
1.43 kg / 3.15 LBS
1428.0 g / 14.0 N
|
| 2 mm | Stal (~0.2) |
1.03 kg / 2.26 LBS
1026.0 g / 10.1 N
|
| 3 mm | Stal (~0.2) |
0.71 kg / 1.57 LBS
712.0 g / 7.0 N
|
| 5 mm | Stal (~0.2) |
0.34 kg / 0.75 LBS
338.0 g / 3.3 N
|
| 10 mm | Stal (~0.2) |
0.07 kg / 0.15 LBS
66.0 g / 0.6 N
|
| 15 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
18.0 g / 0.2 N
|
| 20 mm | Stal (~0.2) |
0.01 kg / 0.01 LBS
6.0 g / 0.1 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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 (shearing) - behavior on slippery surfaces
MPL 40x10x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
2.79 kg / 6.16 LBS
2793.0 g / 27.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
1.86 kg / 4.11 LBS
1862.0 g / 18.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.93 kg / 2.05 LBS
931.0 g / 9.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 40x10x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.93 kg / 2.05 LBS
931.0 g / 9.1 N
|
| 1 mm |
|
2.33 kg / 5.13 LBS
2327.5 g / 22.8 N
|
| 2 mm |
|
4.66 kg / 10.26 LBS
4655.0 g / 45.7 N
|
| 3 mm |
|
6.98 kg / 15.39 LBS
6982.5 g / 68.5 N
|
| 5 mm |
|
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
| 10 mm |
|
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
| 11 mm |
|
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
| 12 mm |
|
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
Table 5: Thermal resistance (material behavior) - power drop
MPL 40x10x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
9.31 kg / 20.53 LBS
9310.0 g / 91.3 N
|
OK |
| 40 °C | -2.2% |
9.11 kg / 20.07 LBS
9105.2 g / 89.3 N
|
OK |
| 60 °C | -4.4% |
8.90 kg / 19.62 LBS
8900.4 g / 87.3 N
|
|
| 80 °C | -6.6% |
8.70 kg / 19.17 LBS
8695.5 g / 85.3 N
|
|
| 100 °C | -28.8% |
6.63 kg / 14.61 LBS
6628.7 g / 65.0 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 40x10x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
18.71 kg / 41.25 LBS
4 164 Gs
|
2.81 kg / 6.19 LBS
2807 g / 27.5 N
|
N/A |
| 1 mm |
16.57 kg / 36.53 LBS
5 185 Gs
|
2.49 kg / 5.48 LBS
2486 g / 24.4 N
|
14.91 kg / 32.88 LBS
~0 Gs
|
| 2 mm |
14.36 kg / 31.65 LBS
4 826 Gs
|
2.15 kg / 4.75 LBS
2153 g / 21.1 N
|
12.92 kg / 28.48 LBS
~0 Gs
|
| 3 mm |
12.24 kg / 26.98 LBS
4 455 Gs
|
1.84 kg / 4.05 LBS
1836 g / 18.0 N
|
11.01 kg / 24.28 LBS
~0 Gs
|
| 5 mm |
8.61 kg / 18.98 LBS
3 737 Gs
|
1.29 kg / 2.85 LBS
1291 g / 12.7 N
|
7.75 kg / 17.08 LBS
~0 Gs
|
| 10 mm |
3.39 kg / 7.48 LBS
2 346 Gs
|
0.51 kg / 1.12 LBS
509 g / 5.0 N
|
3.05 kg / 6.73 LBS
~0 Gs
|
| 20 mm |
0.67 kg / 1.48 LBS
1 045 Gs
|
0.10 kg / 0.22 LBS
101 g / 1.0 N
|
0.61 kg / 1.34 LBS
~0 Gs
|
| 50 mm |
0.03 kg / 0.06 LBS
207 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 60 mm |
0.01 kg / 0.03 LBS
138 Gs
|
0.00 kg / 0.00 LBS
2 g / 0.0 N
|
0.01 kg / 0.02 LBS
~0 Gs
|
| 70 mm |
0.01 kg / 0.01 LBS
96 Gs
|
0.00 kg / 0.00 LBS
1 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.01 LBS
69 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
51 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
39 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (implants) - precautionary measures
MPL 40x10x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 8.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 6.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 5.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 4.0 cm |
| Car key | 50 Gs (5.0 mT) | 3.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - collision effects
MPL 40x10x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
28.72 km/h
(7.98 m/s)
|
0.38 J | |
| 30 mm |
48.67 km/h
(13.52 m/s)
|
1.10 J | |
| 50 mm |
62.82 km/h
(17.45 m/s)
|
1.83 J | |
| 100 mm |
88.83 km/h
(24.68 m/s)
|
3.65 J |
Table 9: Surface protection spec
MPL 40x10x4 / 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 40x10x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 9 840 Mx | 98.4 µWb |
| Pc Coefficient | 0.26 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 40x10x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 9.31 kg | Standard |
| Water (riverbed) |
10.66 kg
(+1.35 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet holds merely ~20% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically 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) = 0.26
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Strengths and weaknesses of Nd2Fe14B magnets.
Advantages
- They virtually do not lose strength, because even after ten years the performance loss is only ~1% (in laboratory conditions),
- They retain their magnetic properties even under external field action,
- A magnet with a metallic silver surface has better aesthetics,
- Neodymium magnets create maximum magnetic induction on a their surface, which allows for strong attraction,
- Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
- Due to the ability of free shaping and customization to specialized projects, NdFeB magnets can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
- Huge importance in modern industrial fields – they are commonly used in data components, motor assemblies, diagnostic systems, as well as complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
- When exposed to high temperature, neodymium magnets experience 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
- 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 prevent oxidation as well as corrosion.
- Limited possibility of making nuts in the magnet and complex forms - preferred is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that small components of these magnets are able to complicate diagnosis medical when they are in the body.
- With large orders the cost of neodymium magnets is economically unviable,
Holding force characteristics
Maximum magnetic pulling force – what affects it?
- using a sheet made of mild steel, acting as a ideal flux conductor
- whose transverse dimension equals approx. 10 mm
- with a plane perfectly flat
- with total lack of distance (without coatings)
- during pulling in a direction perpendicular to the plane
- in neutral thermal conditions
Impact of factors on magnetic holding capacity in practice
- Distance (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, rust or debris).
- Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of nominal force).
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
- Steel grade – ideal substrate is high-permeability steel. Stainless steels may attract less.
- Smoothness – ideal contact is obtained only on polished steel. Rough texture create air cushions, weakening the magnet.
- Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate lowers the holding force.
Safety rules for work with neodymium magnets
Fire risk
Dust produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.
Danger to pacemakers
Patients with a ICD must maintain an absolute distance from magnets. The magnetism can stop the operation of the life-saving device.
Physical harm
Pinching hazard: The attraction force is so great that it can cause blood blisters, crushing, and even bone fractures. Use thick gloves.
Safe operation
Handle magnets with awareness. Their immense force can surprise even experienced users. Plan your moves and do not underestimate their force.
Danger to the youngest
Neodymium magnets are not intended for children. Eating multiple magnets may result in them attracting across intestines, which constitutes a direct threat to life and necessitates immediate surgery.
Threat to navigation
An intense magnetic field interferes with the operation of compasses in smartphones and GPS navigation. Maintain magnets near a device to avoid breaking the sensors.
Data carriers
Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, hearing aids, timepieces).
Allergic reactions
It is widely known that the nickel plating (standard magnet coating) is a strong allergen. If you have an allergy, avoid direct skin contact and choose versions in plastic housing.
Demagnetization risk
Regular neodymium magnets (N-type) lose power when the temperature goes above 80°C. Damage is permanent.
Shattering risk
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets will cause them breaking into small pieces.
