MPL 40x15x6 / N38 - lamellar magnet
lamellar magnet
Catalog no 020155
GTIN/EAN: 5906301811619
length
40 mm [±0,1 mm]
Width
15 mm [±0,1 mm]
Height
6 mm [±0,1 mm]
Weight
27 g
Magnetization Direction
↑ axial
Load capacity
14.21 kg / 139.45 N
Magnetic Induction
286.36 mT / 2864 Gs
Coating
[NiCuNi] Nickel
18.45 ZŁ with VAT / pcs + price for transport
15.00 ZŁ net + 23% VAT / pcs
bulk discounts:
Need more?
Call us now
+48 22 499 98 98
alternatively get in touch via
contact form
the contact page.
Weight along with appearance of magnets can be checked with our
force calculator.
Orders submitted before 14:00 will be dispatched today!
Technical specification - MPL 40x15x6 / N38 - lamellar magnet
Specification / characteristics - MPL 40x15x6 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020155 |
| GTIN/EAN | 5906301811619 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 40 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 6 mm [±0,1 mm] |
| Weight | 27 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 14.21 kg / 139.45 N |
| Magnetic Induction ~ ? | 286.36 mT / 2864 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 product - technical parameters
These information represent the outcome of a physical analysis. Results are based on algorithms for the class Nd2Fe14B. Actual parameters may differ. Use these calculations as a reference point during assembly planning.
Table 1: Static force (pull vs gap) - interaction chart
MPL 40x15x6 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
2863 Gs
286.3 mT
|
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
|
dangerous! |
| 1 mm |
2635 Gs
263.5 mT
|
12.04 kg / 26.55 pounds
12041.8 g / 118.1 N
|
dangerous! |
| 2 mm |
2385 Gs
238.5 mT
|
9.86 kg / 21.74 pounds
9859.1 g / 96.7 N
|
warning |
| 3 mm |
2132 Gs
213.2 mT
|
7.88 kg / 17.37 pounds
7880.1 g / 77.3 N
|
warning |
| 5 mm |
1670 Gs
167.0 mT
|
4.84 kg / 10.66 pounds
4837.1 g / 47.5 N
|
warning |
| 10 mm |
903 Gs
90.3 mT
|
1.41 kg / 3.11 pounds
1412.2 g / 13.9 N
|
safe |
| 15 mm |
520 Gs
52.0 mT
|
0.47 kg / 1.03 pounds
469.2 g / 4.6 N
|
safe |
| 20 mm |
320 Gs
32.0 mT
|
0.18 kg / 0.39 pounds
177.7 g / 1.7 N
|
safe |
| 30 mm |
141 Gs
14.1 mT
|
0.03 kg / 0.08 pounds
34.5 g / 0.3 N
|
safe |
| 50 mm |
41 Gs
4.1 mT
|
0.00 kg / 0.01 pounds
3.0 g / 0.0 N
|
safe |
Table 2: Sliding load (vertical surface)
MPL 40x15x6 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.84 kg / 6.27 pounds
2842.0 g / 27.9 N
|
| 1 mm | Stal (~0.2) |
2.41 kg / 5.31 pounds
2408.0 g / 23.6 N
|
| 2 mm | Stal (~0.2) |
1.97 kg / 4.35 pounds
1972.0 g / 19.3 N
|
| 3 mm | Stal (~0.2) |
1.58 kg / 3.47 pounds
1576.0 g / 15.5 N
|
| 5 mm | Stal (~0.2) |
0.97 kg / 2.13 pounds
968.0 g / 9.5 N
|
| 10 mm | Stal (~0.2) |
0.28 kg / 0.62 pounds
282.0 g / 2.8 N
|
| 15 mm | Stal (~0.2) |
0.09 kg / 0.21 pounds
94.0 g / 0.9 N
|
| 20 mm | Stal (~0.2) |
0.04 kg / 0.08 pounds
36.0 g / 0.4 N
|
| 30 mm | Stal (~0.2) |
0.01 kg / 0.01 pounds
6.0 g / 0.1 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 40x15x6 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
4.26 kg / 9.40 pounds
4263.0 g / 41.8 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.84 kg / 6.27 pounds
2842.0 g / 27.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.42 kg / 3.13 pounds
1421.0 g / 13.9 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
7.11 kg / 15.66 pounds
7105.0 g / 69.7 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 40x15x6 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.71 kg / 1.57 pounds
710.5 g / 7.0 N
|
| 1 mm |
|
1.78 kg / 3.92 pounds
1776.3 g / 17.4 N
|
| 2 mm |
|
3.55 kg / 7.83 pounds
3552.5 g / 34.9 N
|
| 3 mm |
|
5.33 kg / 11.75 pounds
5328.8 g / 52.3 N
|
| 5 mm |
|
8.88 kg / 19.58 pounds
8881.3 g / 87.1 N
|
| 10 mm |
|
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
|
| 11 mm |
|
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
|
| 12 mm |
|
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
|
Table 5: Working in heat (material behavior) - power drop
MPL 40x15x6 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
14.21 kg / 31.33 pounds
14210.0 g / 139.4 N
|
OK |
| 40 °C | -2.2% |
13.90 kg / 30.64 pounds
13897.4 g / 136.3 N
|
OK |
| 60 °C | -4.4% |
13.58 kg / 29.95 pounds
13584.8 g / 133.3 N
|
|
| 80 °C | -6.6% |
13.27 kg / 29.26 pounds
13272.1 g / 130.2 N
|
|
| 100 °C | -28.8% |
10.12 kg / 22.31 pounds
10117.5 g / 99.3 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 40x15x6 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
30.32 kg / 66.84 pounds
4 334 Gs
|
4.55 kg / 10.03 pounds
4547 g / 44.6 N
|
N/A |
| 1 mm |
28.06 kg / 61.86 pounds
5 508 Gs
|
4.21 kg / 9.28 pounds
4209 g / 41.3 N
|
25.25 kg / 55.67 pounds
~0 Gs
|
| 2 mm |
25.69 kg / 56.64 pounds
5 271 Gs
|
3.85 kg / 8.50 pounds
3854 g / 37.8 N
|
23.12 kg / 50.97 pounds
~0 Gs
|
| 3 mm |
23.33 kg / 51.43 pounds
5 023 Gs
|
3.50 kg / 7.71 pounds
3499 g / 34.3 N
|
21.00 kg / 46.29 pounds
~0 Gs
|
| 5 mm |
18.85 kg / 41.56 pounds
4 515 Gs
|
2.83 kg / 6.23 pounds
2828 g / 27.7 N
|
16.97 kg / 37.40 pounds
~0 Gs
|
| 10 mm |
10.32 kg / 22.75 pounds
3 341 Gs
|
1.55 kg / 3.41 pounds
1548 g / 15.2 N
|
9.29 kg / 20.48 pounds
~0 Gs
|
| 20 mm |
3.01 kg / 6.64 pounds
1 805 Gs
|
0.45 kg / 1.00 pounds
452 g / 4.4 N
|
2.71 kg / 5.98 pounds
~0 Gs
|
| 50 mm |
0.16 kg / 0.35 pounds
416 Gs
|
0.02 kg / 0.05 pounds
24 g / 0.2 N
|
0.14 kg / 0.32 pounds
~0 Gs
|
| 60 mm |
0.07 kg / 0.16 pounds
282 Gs
|
0.01 kg / 0.02 pounds
11 g / 0.1 N
|
0.07 kg / 0.15 pounds
~0 Gs
|
| 70 mm |
0.04 kg / 0.08 pounds
199 Gs
|
0.01 kg / 0.01 pounds
5 g / 0.1 N
|
0.03 kg / 0.07 pounds
~0 Gs
|
| 80 mm |
0.02 kg / 0.04 pounds
144 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
| 90 mm |
0.01 kg / 0.02 pounds
108 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
| 100 mm |
0.01 kg / 0.01 pounds
83 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 40x15x6 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 11.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 8.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 5.5 cm |
| Remote | 50 Gs (5.0 mT) | 5.0 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 40x15x6 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.53 km/h
(6.81 m/s)
|
0.63 J | |
| 30 mm |
40.13 km/h
(11.15 m/s)
|
1.68 J | |
| 50 mm |
51.74 km/h
(14.37 m/s)
|
2.79 J | |
| 100 mm |
73.16 km/h
(20.32 m/s)
|
5.58 J |
Table 9: Corrosion resistance
MPL 40x15x6 / 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 40x15x6 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 16 905 Mx | 169.0 µWb |
| Pc Coefficient | 0.31 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 40x15x6 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 14.21 kg | Standard |
| Water (riverbed) |
16.27 kg
(+2.06 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Note: On a vertical surface, the magnet retains just ~20% of its max power.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For N38 grade, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.31
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 proposals
Pros and cons of Nd2Fe14B magnets.
Advantages
- They do not lose magnetism, even after nearly ten years – the decrease in power is only ~1% (according to tests),
- They retain their magnetic properties even under close interference source,
- The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Considering the possibility of accurate forming and adaptation to custom requirements, neodymium magnets can be manufactured in a wide range of forms and dimensions, which amplifies use scope,
- Key role in high-tech industry – they are utilized in magnetic memories, electric drive systems, precision medical tools, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which enables their usage in miniature devices
Weaknesses
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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
- Limited ability of producing threads in the magnet and complex forms - preferred is cover - magnet mounting.
- Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
- Due to expensive raw materials, their price exceeds standard values,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what affects it?
- with the application of a yoke made of low-carbon steel, ensuring maximum field concentration
- with a cross-section of at least 10 mm
- with a surface free of scratches
- with direct contact (without coatings)
- during pulling in a direction vertical to the plane
- in neutral thermal conditions
Magnet lifting force in use – key factors
- Gap (between the magnet and the metal), as even a very small distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to paint, rust or dirt).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the power to be escaped to the other side.
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels reduce magnetic permeability and lifting capacity.
- Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.
Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, however under parallel forces the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
Precautions when working with neodymium magnets
GPS and phone interference
Be aware: rare earth magnets produce a field that confuses sensitive sensors. Keep a separation from your mobile, tablet, and GPS.
Handling rules
Handle magnets consciously. Their huge power can shock even experienced users. Stay alert and respect their force.
Allergy Warning
Nickel alert: The nickel-copper-nickel coating contains nickel. If redness happens, cease working with magnets and wear gloves.
Do not overheat magnets
Watch the temperature. Heating the magnet to high heat will destroy its magnetic structure and strength.
Combustion hazard
Combustion risk: Rare earth powder is explosive. Do not process magnets in home conditions as this may cause fire.
Protect data
Equipment safety: Strong magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).
Adults only
Neodymium magnets are not toys. Eating multiple magnets may result in them attracting across intestines, which constitutes a critical condition and requires immediate surgery.
Pacemakers
People with a heart stimulator should keep an large gap from magnets. The magnetism can stop the operation of the life-saving device.
Pinching danger
Large magnets can smash fingers instantly. Under no circumstances put your hand betwixt two strong magnets.
Magnets are brittle
NdFeB magnets are ceramic materials, meaning they are fragile like glass. Impact of two magnets will cause them shattering into shards.
