MPL 3x3x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020148
GTIN/EAN: 5906301811541
length
3 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
0.2 g
Magnetization Direction
↑ axial
Load capacity
0.34 kg / 3.37 N
Magnetic Induction
538.48 mT / 5385 Gs
Coating
[NiCuNi] Nickel
0.1845 ZŁ with VAT / pcs + price for transport
0.1500 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MPL 3x3x3 / N38 - lamellar magnet
Specification / characteristics - MPL 3x3x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020148 |
| GTIN/EAN | 5906301811541 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 3 mm [±0,1 mm] |
| Width | 3 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 0.2 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.34 kg / 3.37 N |
| Magnetic Induction ~ ? | 538.48 mT / 5385 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 simulation of the magnet - report
Presented values constitute the result of a mathematical calculation. Values are based on models for the material Nd2Fe14B. Real-world parameters might slightly deviate from the simulation results. Use these data as a preliminary roadmap for designers.
Table 1: Static pull force (force vs distance) - power drop
MPL 3x3x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
5372 Gs
537.2 mT
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
low risk |
| 1 mm |
2530 Gs
253.0 mT
|
0.08 kg / 0.17 LBS
75.4 g / 0.7 N
|
low risk |
| 2 mm |
1127 Gs
112.7 mT
|
0.01 kg / 0.03 LBS
15.0 g / 0.1 N
|
low risk |
| 3 mm |
562 Gs
56.2 mT
|
0.00 kg / 0.01 LBS
3.7 g / 0.0 N
|
low risk |
| 5 mm |
192 Gs
19.2 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
low risk |
| 10 mm |
35 Gs
3.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 15 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 20 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 30 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
low risk |
Table 2: Shear load (wall)
MPL 3x3x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
|
| 1 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
16.0 g / 0.2 N
|
| 2 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
0.0 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 (sliding) - behavior on slippery surfaces
MPL 3x3x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.10 kg / 0.22 LBS
102.0 g / 1.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.07 kg / 0.15 LBS
68.0 g / 0.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.03 kg / 0.07 LBS
34.0 g / 0.3 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 3x3x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.03 kg / 0.07 LBS
34.0 g / 0.3 N
|
| 1 mm |
|
0.09 kg / 0.19 LBS
85.0 g / 0.8 N
|
| 2 mm |
|
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
| 3 mm |
|
0.26 kg / 0.56 LBS
255.0 g / 2.5 N
|
| 5 mm |
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| 10 mm |
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| 11 mm |
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
| 12 mm |
|
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
Table 5: Thermal resistance (stability) - thermal limit
MPL 3x3x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.34 kg / 0.75 LBS
340.0 g / 3.3 N
|
OK |
| 40 °C | -2.2% |
0.33 kg / 0.73 LBS
332.5 g / 3.3 N
|
OK |
| 60 °C | -4.4% |
0.33 kg / 0.72 LBS
325.0 g / 3.2 N
|
OK |
| 80 °C | -6.6% |
0.32 kg / 0.70 LBS
317.6 g / 3.1 N
|
|
| 100 °C | -28.8% |
0.24 kg / 0.53 LBS
242.1 g / 2.4 N
|
Table 6: Magnet-Magnet interaction (repulsion) - forces in the system
MPL 3x3x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.60 kg / 3.53 LBS
5 931 Gs
|
0.24 kg / 0.53 LBS
240 g / 2.4 N
|
N/A |
| 1 mm |
0.80 kg / 1.77 LBS
7 610 Gs
|
0.12 kg / 0.27 LBS
120 g / 1.2 N
|
0.72 kg / 1.59 LBS
~0 Gs
|
| 2 mm |
0.36 kg / 0.78 LBS
5 061 Gs
|
0.05 kg / 0.12 LBS
53 g / 0.5 N
|
0.32 kg / 0.70 LBS
~0 Gs
|
| 3 mm |
0.15 kg / 0.34 LBS
3 343 Gs
|
0.02 kg / 0.05 LBS
23 g / 0.2 N
|
0.14 kg / 0.31 LBS
~0 Gs
|
| 5 mm |
0.03 kg / 0.08 LBS
1 568 Gs
|
0.01 kg / 0.01 LBS
5 g / 0.1 N
|
0.03 kg / 0.07 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
384 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 20 mm |
0.00 kg / 0.00 LBS
70 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
6 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 LBS
3 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 LBS
2 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 LBS
1 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
1 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
1 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MPL 3x3x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 2.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 1.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 1.0 cm |
| Car key | 50 Gs (5.0 mT) | 1.0 cm |
| Payment card | 400 Gs (40.0 mT) | 0.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 0.5 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 3x3x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
41.58 km/h
(11.55 m/s)
|
0.01 J | |
| 30 mm |
72.02 km/h
(20.01 m/s)
|
0.04 J | |
| 50 mm |
92.98 km/h
(25.83 m/s)
|
0.07 J | |
| 100 mm |
131.49 km/h
(36.53 m/s)
|
0.13 J |
Table 9: Corrosion resistance
MPL 3x3x3 / 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: Electrical data (Pc)
MPL 3x3x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 495 Mx | 5.0 µWb |
| Pc Coefficient | 0.84 | High (Stable) |
Table 11: Hydrostatics and buoyancy
MPL 3x3x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.34 kg | Standard |
| Water (riverbed) |
0.39 kg
(+0.05 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Note: On a vertical surface, the magnet holds only approx. 20-30% of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Power loss vs temp
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.84
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 |
See also deals
Advantages as well as disadvantages of rare earth magnets.
Pros
- Their magnetic field is maintained, and after around ten years it decreases only by ~1% (theoretically),
- They have excellent resistance to magnetic field loss due to external magnetic sources,
- Thanks to the smooth finish, the plating of nickel, gold-plated, or silver gives an elegant appearance,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
- Possibility of accurate creating and optimizing to individual needs,
- Huge importance in high-tech industry – they are commonly used in HDD drives, electromotive mechanisms, precision medical tools, also complex engineering applications.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Disadvantages
- To avoid cracks under impact, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce 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 resistant to moisture, in case of application outdoors
- Due to limitations in realizing nuts and complicated shapes in magnets, we recommend using cover - magnetic holder.
- Health risk related to microscopic parts of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these devices are able to be problematic in diagnostics medical in case of swallowing.
- High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which hinders application in large quantities
Holding force characteristics
Maximum lifting capacity of the magnet – what affects it?
- using a sheet made of high-permeability steel, serving as a ideal flux conductor
- whose thickness equals approx. 10 mm
- characterized by smoothness
- under conditions of ideal adhesion (metal-to-metal)
- during detachment in a direction vertical to the mounting surface
- at temperature room level
Impact of factors on magnetic holding capacity in practice
- Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
- Plate material – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
- Surface structure – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
- Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the load capacity.
Warnings
Heat warning
Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will ruin its magnetic structure and pulling force.
Bone fractures
Danger of trauma: The attraction force is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.
GPS Danger
Navigation devices and mobile phones are highly sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the sensors in your phone.
Electronic hazard
Powerful magnetic fields can erase data on credit cards, HDDs, and other magnetic media. Maintain a gap of min. 10 cm.
Powerful field
Be careful. Neodymium magnets attract from a distance and snap with massive power, often quicker than you can react.
Metal Allergy
Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, cease handling magnets and wear gloves.
Material brittleness
Despite metallic appearance, neodymium is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Medical implants
For implant holders: Strong magnetic fields disrupt medical devices. Keep at least 30 cm distance or ask another person to handle the magnets.
No play value
Neodymium magnets are not suitable for play. Accidental ingestion of a few magnets can lead to them pinching intestinal walls, which poses a direct threat to life and requires urgent medical intervention.
Dust explosion hazard
Dust generated during cutting of magnets is flammable. Avoid drilling into magnets unless you are an expert.
