MPL 3x3x1 / N38 - lamellar magnet
lamellar magnet
Catalog no 020146
GTIN/EAN: 5906301811527
length
3 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
1 mm [±0,1 mm]
Weight
0.07 g
Magnetization Direction
↑ axial
Load capacity
0.23 kg / 2.29 N
Magnetic Induction
317.31 mT / 3173 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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Technical specification of the product - MPL 3x3x1 / N38 - lamellar magnet
Specification / characteristics - MPL 3x3x1 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020146 |
| GTIN/EAN | 5906301811527 |
| 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 | 1 mm [±0,1 mm] |
| Weight | 0.07 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.23 kg / 2.29 N |
| Magnetic Induction ~ ? | 317.31 mT / 3173 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
Presented information constitute the direct effect of a mathematical analysis. Values are based on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Treat these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs gap) - characteristics
MPL 3x3x1 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3168 Gs
316.8 mT
|
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
safe |
| 1 mm |
1565 Gs
156.5 mT
|
0.06 kg / 0.12 lbs
56.1 g / 0.6 N
|
safe |
| 2 mm |
659 Gs
65.9 mT
|
0.01 kg / 0.02 lbs
9.9 g / 0.1 N
|
safe |
| 3 mm |
307 Gs
30.7 mT
|
0.00 kg / 0.00 lbs
2.2 g / 0.0 N
|
safe |
| 5 mm |
94 Gs
9.4 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
safe |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
safe |
Table 2: Vertical hold (wall)
MPL 3x3x1 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
|
| 1 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 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 (shearing) - behavior on slippery surfaces
MPL 3x3x1 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.07 kg / 0.15 lbs
69.0 g / 0.7 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.02 kg / 0.05 lbs
23.0 g / 0.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.12 kg / 0.25 lbs
115.0 g / 1.1 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 3x3x1 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.02 kg / 0.05 lbs
23.0 g / 0.2 N
|
| 1 mm |
|
0.06 kg / 0.13 lbs
57.5 g / 0.6 N
|
| 2 mm |
|
0.12 kg / 0.25 lbs
115.0 g / 1.1 N
|
| 3 mm |
|
0.17 kg / 0.38 lbs
172.5 g / 1.7 N
|
| 5 mm |
|
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
| 10 mm |
|
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
| 11 mm |
|
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
| 12 mm |
|
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
Table 5: Thermal stability (stability) - resistance threshold
MPL 3x3x1 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.23 kg / 0.51 lbs
230.0 g / 2.3 N
|
OK |
| 40 °C | -2.2% |
0.22 kg / 0.50 lbs
224.9 g / 2.2 N
|
OK |
| 60 °C | -4.4% |
0.22 kg / 0.48 lbs
219.9 g / 2.2 N
|
|
| 80 °C | -6.6% |
0.21 kg / 0.47 lbs
214.8 g / 2.1 N
|
|
| 100 °C | -28.8% |
0.16 kg / 0.36 lbs
163.8 g / 1.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 3x3x1 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
0.56 kg / 1.23 lbs
4 719 Gs
|
0.08 kg / 0.18 lbs
84 g / 0.8 N
|
N/A |
| 1 mm |
0.31 kg / 0.68 lbs
4 706 Gs
|
0.05 kg / 0.10 lbs
46 g / 0.5 N
|
0.28 kg / 0.61 lbs
~0 Gs
|
| 2 mm |
0.14 kg / 0.30 lbs
3 129 Gs
|
0.02 kg / 0.04 lbs
20 g / 0.2 N
|
0.12 kg / 0.27 lbs
~0 Gs
|
| 3 mm |
0.06 kg / 0.12 lbs
2 019 Gs
|
0.01 kg / 0.02 lbs
8 g / 0.1 N
|
0.05 kg / 0.11 lbs
~0 Gs
|
| 5 mm |
0.01 kg / 0.02 lbs
885 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 lbs
188 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
30 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
2 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
1 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
1 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
0 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
0 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 3x3x1 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 1.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 1.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 1.0 cm |
| Remote | 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: Dynamics (kinetic energy) - warning
MPL 3x3x1 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
57.81 km/h
(16.06 m/s)
|
0.01 J | |
| 30 mm |
100.13 km/h
(27.81 m/s)
|
0.03 J | |
| 50 mm |
129.27 km/h
(35.91 m/s)
|
0.05 J | |
| 100 mm |
182.81 km/h
(50.78 m/s)
|
0.09 J |
Table 9: Corrosion resistance
MPL 3x3x1 / 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 (Flux)
MPL 3x3x1 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 306 Mx | 3.1 µWb |
| Pc Coefficient | 0.40 | Low (Flat) |
Table 11: Submerged application
MPL 3x3x1 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.23 kg | Standard |
| Water (riverbed) |
0.26 kg
(+0.03 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical wall, the magnet holds only approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. computer case) significantly weakens the holding force.
3. Heat tolerance
*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) = 0.40
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Strengths and weaknesses of neodymium magnets.
Benefits
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (according to literature),
- Neodymium magnets are characterized by extremely resistant to magnetic field loss caused by external interference,
- Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold, or silver gives an visually attractive appearance,
- Magnets are distinguished by exceptionally strong magnetic induction on the outer layer,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to modularity in constructing and the capacity to modify to specific needs,
- Wide application in high-tech industry – they are used in hard drives, motor assemblies, precision medical tools, as well as modern systems.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which allows their use in compact constructions
Limitations
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
- They rust in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited possibility of making nuts in the magnet and complex forms - preferred is casing - magnet mounting.
- Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price is relatively high,
Pull force analysis
Highest magnetic holding force – what contributes to it?
- with the application of a sheet made of low-carbon steel, ensuring full magnetic saturation
- whose transverse dimension is min. 10 mm
- characterized by smoothness
- without any insulating layer between the magnet and steel
- for force acting at a right angle (in the magnet axis)
- in temp. approx. 20°C
Lifting capacity in real conditions – factors
- Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of generating force.
- Steel grade – ideal substrate is pure iron steel. Cast iron may attract less.
- Surface condition – smooth surfaces ensure maximum contact, which increases force. Uneven metal weaken the grip.
- Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the holding force is lower. Additionally, even a slight gap between the magnet and the plate decreases the holding force.
H&S for magnets
Choking Hazard
Always store magnets away from children. Risk of swallowing is significant, and the consequences of magnets clamping inside the body are fatal.
Risk of cracking
Watch out for shards. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
Flammability
Dust produced during grinding of magnets is flammable. Do not drill into magnets unless you are an expert.
Serious injuries
Protect your hands. Two large magnets will join immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Medical interference
Warning for patients: Strong magnetic fields disrupt medical devices. Keep minimum 30 cm distance or request help to work with the magnets.
Precision electronics
Navigation devices and mobile phones are extremely susceptible to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.
Heat warning
Keep cool. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).
Do not underestimate power
Handle with care. Rare earth magnets act from a long distance and snap with huge force, often quicker than you can react.
Threat to electronics
Avoid bringing magnets near a wallet, computer, or screen. The magnetism can destroy these devices and erase data from cards.
Warning for allergy sufferers
A percentage of the population suffer from a hypersensitivity to nickel, which is the common plating for NdFeB magnets. Frequent touching can result in a rash. We suggest use safety gloves.
