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:
Need more?
Pick up the phone and ask
+48 888 99 98 98
otherwise send us a note by means of
form
the contact form page.
Lifting power as well as form of a magnet can be calculated using our
online calculation tool.
Orders submitted before 14:00 will be dispatched today!
Product card - 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 |
Engineering modeling of the assembly - technical parameters
Presented values constitute the result of a mathematical analysis. Values were calculated on algorithms for the class Nd2Fe14B. Real-world performance may differ. Use these data as a preliminary roadmap for designers.
Table 1: Static force (force vs gap) - interaction chart
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
|
medium risk |
| 1 mm |
2413 Gs
241.3 mT
|
7.14 kg / 15.75 LBS
7143.1 g / 70.1 N
|
medium risk |
| 2 mm |
2044 Gs
204.4 mT
|
5.13 kg / 11.31 LBS
5128.9 g / 50.3 N
|
medium risk |
| 3 mm |
1703 Gs
170.3 mT
|
3.56 kg / 7.85 LBS
3559.5 g / 34.9 N
|
medium risk |
| 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: Sliding force (vertical surface)
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) - vertical pull
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: Steel thickness (substrate influence) - sheet metal selection
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: Two magnets (repulsion) - forces in the system
MPL 40x10x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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 (electronics) - 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 |
| Mechanical watch | 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 (cracking risk) - warning
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: Corrosion resistance
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 (Pc)
MPL 40x10x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 9 840 Mx | 98.4 µWb |
| Pc Coefficient | 0.26 | Low (Flat) |
Table 11: Submerged application
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. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its max power.
2. Steel thickness impact
*Thin steel (e.g. computer case) significantly limits the holding force.
3. Thermal stability
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.26
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.
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 |
Other deals
Strengths as well as weaknesses of neodymium magnets.
Pros
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (theoretically),
- They feature excellent resistance to magnetism drop as a result of opposing magnetic fields,
- A magnet with a shiny gold surface has an effective appearance,
- The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
- Thanks to flexibility in shaping and the capacity to customize to unusual requirements,
- Wide application in advanced technology sectors – they find application in hard drives, motor assemblies, medical equipment, also modern systems.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Weaknesses
- At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
- NdFeB magnets demagnetize 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 very resistant to heat
- When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation and corrosion.
- Limited possibility of making threads in the magnet and complicated forms - recommended is cover - magnet mounting.
- Potential hazard related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small components of these devices can be problematic in diagnostics medical after entering the body.
- With large orders the cost of neodymium magnets is economically unviable,
Lifting parameters
Highest magnetic holding force – what affects it?
- on a plate made of mild steel, optimally conducting the magnetic field
- whose thickness equals approx. 10 mm
- with an ground touching surface
- under conditions of ideal adhesion (surface-to-surface)
- during detachment in a direction vertical to the plane
- at conditions approx. 20°C
Lifting capacity in real conditions – factors
- Air gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
- Force direction – catalog parameter refers to pulling vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Metal type – different alloys attracts identically. High carbon content worsen the attraction effect.
- Surface quality – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
- Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (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. Moreover, even a minimal clearance between the magnet and the plate decreases the load capacity.
Safe handling of NdFeB magnets
No play value
Adult use only. Tiny parts pose a choking risk, causing intestinal necrosis. Store out of reach of children and animals.
Do not drill into magnets
Mechanical processing of NdFeB material carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Pacemakers
Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.
Heat warning
Standard neodymium magnets (N-type) undergo demagnetization when the temperature goes above 80°C. Damage is permanent.
Caution required
Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Be predictive.
Magnetic media
Very strong magnetic fields can corrupt files on credit cards, hard drives, and storage devices. Maintain a gap of min. 10 cm.
Allergic reactions
Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If your skin reacts to metals, prevent direct skin contact or select encased magnets.
Magnet fragility
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Keep away from electronics
A strong magnetic field disrupts the operation of magnetometers in phones and GPS navigation. Do not bring magnets close to a device to prevent breaking the sensors.
Bone fractures
Danger of trauma: The pulling power is so immense that it can cause hematomas, crushing, and even bone fractures. Protective gloves are recommended.
