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 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 |
Technical simulation of the magnet - technical parameters
The following values are the outcome of a physical analysis. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions may differ. Use these data as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs distance) - 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
|
low risk |
| 1 mm |
1565 Gs
156.5 mT
|
0.06 kg / 0.12 lbs
56.1 g / 0.6 N
|
low risk |
| 2 mm |
659 Gs
65.9 mT
|
0.01 kg / 0.02 lbs
9.9 g / 0.1 N
|
low risk |
| 3 mm |
307 Gs
30.7 mT
|
0.00 kg / 0.00 lbs
2.2 g / 0.0 N
|
low risk |
| 5 mm |
94 Gs
9.4 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
low risk |
| 10 mm |
15 Gs
1.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 15 mm |
5 Gs
0.5 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 20 mm |
2 Gs
0.2 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
| 30 mm |
1 Gs
0.1 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 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 (sliding) - 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 (substrate influence) - sheet metal selection
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: Two magnets (attraction) - field collision
MPL 3x3x1 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Hazards (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 |
| Timepiece | 20 Gs (2.0 mT) | 1.0 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 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 (Pc)
MPL 3x3x1 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 306 Mx | 3.1 µWb |
| Pc Coefficient | 0.40 | Low (Flat) |
Table 11: Physics of underwater searching
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)
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) severely reduces the holding force.
3. Heat tolerance
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40
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 rare earth magnets.
Benefits
- Their strength is maintained, and after approximately 10 years it decreases only by ~1% (theoretically),
- They are extremely resistant to demagnetization induced by external field influence,
- Thanks to the shiny finish, the coating of Ni-Cu-Ni, gold-plated, or silver gives an elegant appearance,
- They feature high magnetic induction at the operating surface, making them more effective,
- Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to freedom in forming and the capacity to adapt to client solutions,
- Fundamental importance in advanced technology sectors – they find application in magnetic memories, electromotive mechanisms, medical equipment, and complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Due to limitations in realizing nuts and complicated shapes in magnets, we propose using a housing - magnetic mount.
- Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
- Due to expensive raw materials, their price is relatively high,
Pull force analysis
Breakaway strength of the magnet in ideal conditions – what contributes to it?
- with the contact of a sheet made of special test steel, ensuring maximum field concentration
- possessing a thickness of min. 10 mm to ensure full flux closure
- characterized by smoothness
- with total lack of distance (without impurities)
- for force applied at a right angle (in the magnet axis)
- in neutral thermal conditions
Practical lifting capacity: influencing factors
- Air gap (betwixt the magnet and the plate), as even a tiny distance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Steel type – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
- Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
- Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and in frost they can be stronger (up to a certain limit).
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a slight gap between the magnet and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Finger safety
Watch your fingers. Two large magnets will snap together instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!
Compass and GPS
Note: neodymium magnets generate a field that disrupts sensitive sensors. Keep a separation from your mobile, tablet, and navigation systems.
ICD Warning
Warning for patients: Powerful magnets affect medical devices. Maintain minimum 30 cm distance or request help to handle the magnets.
Cards and drives
Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Protective goggles
Neodymium magnets are ceramic materials, which means they are fragile like glass. Impact of two magnets leads to them breaking into shards.
Nickel coating and allergies
A percentage of the population have a sensitization to nickel, which is the common plating for NdFeB magnets. Prolonged contact may cause skin redness. It is best to wear safety gloves.
Thermal limits
Monitor thermal conditions. Exposing the magnet above 80 degrees Celsius will destroy its magnetic structure and strength.
Product not for children
Adult use only. Small elements pose a choking risk, leading to severe trauma. Keep away from kids and pets.
Do not underestimate power
Handle with care. Rare earth magnets act from a distance and snap with massive power, often faster than you can move away.
Fire warning
Fire hazard: Rare earth powder is explosive. Avoid machining magnets without safety gear as this risks ignition.
