MPL 3x3x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020147
GTIN/EAN: 5906301811534
length
3 mm [±0,1 mm]
Width
3 mm [±0,1 mm]
Height
2 mm [±0,1 mm]
Weight
0.13 g
Magnetization Direction
↑ axial
Load capacity
0.36 kg / 3.49 N
Magnetic Induction
472.94 mT / 4729 Gs
Coating
[NiCuNi] Nickel
0.1722 ZŁ with VAT / pcs + price for transport
0.1400 ZŁ net + 23% VAT / pcs
bulk discounts:
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Technical of the product - MPL 3x3x2 / N38 - lamellar magnet
Specification / characteristics - MPL 3x3x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020147 |
| GTIN/EAN | 5906301811534 |
| 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 | 2 mm [±0,1 mm] |
| Weight | 0.13 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 0.36 kg / 3.49 N |
| Magnetic Induction ~ ? | 472.94 mT / 4729 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 modeling of the assembly - data
These information are the direct effect of a engineering analysis. Values are based on algorithms for the material Nd2Fe14B. Real-world performance may differ. Use these calculations as a reference point when designing systems.
Table 1: Static pull force (force vs gap) - power drop
MPL 3x3x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4719 Gs
471.9 mT
|
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
weak grip |
| 1 mm |
2223 Gs
222.3 mT
|
0.08 kg / 0.18 LBS
79.9 g / 0.8 N
|
weak grip |
| 2 mm |
966 Gs
96.6 mT
|
0.02 kg / 0.03 LBS
15.1 g / 0.1 N
|
weak grip |
| 3 mm |
468 Gs
46.8 mT
|
0.00 kg / 0.01 LBS
3.5 g / 0.0 N
|
weak grip |
| 5 mm |
153 Gs
15.3 mT
|
0.00 kg / 0.00 LBS
0.4 g / 0.0 N
|
weak grip |
| 10 mm |
26 Gs
2.6 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 15 mm |
9 Gs
0.9 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 20 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 30 mm |
1 Gs
0.1 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
0 Gs
0.0 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage load (wall)
MPL 3x3x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.07 kg / 0.16 LBS
72.0 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 / 0.01 LBS
4.0 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) - vertical pull
MPL 3x3x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.11 kg / 0.24 LBS
108.0 g / 1.1 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.07 kg / 0.16 LBS
72.0 g / 0.7 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.18 kg / 0.40 LBS
180.0 g / 1.8 N
|
Table 4: Steel thickness (saturation) - sheet metal selection
MPL 3x3x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.04 kg / 0.08 LBS
36.0 g / 0.4 N
|
| 1 mm |
|
0.09 kg / 0.20 LBS
90.0 g / 0.9 N
|
| 2 mm |
|
0.18 kg / 0.40 LBS
180.0 g / 1.8 N
|
| 3 mm |
|
0.27 kg / 0.60 LBS
270.0 g / 2.6 N
|
| 5 mm |
|
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
| 10 mm |
|
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
| 11 mm |
|
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
| 12 mm |
|
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
Table 5: Thermal resistance (material behavior) - resistance threshold
MPL 3x3x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.36 kg / 0.79 LBS
360.0 g / 3.5 N
|
OK |
| 40 °C | -2.2% |
0.35 kg / 0.78 LBS
352.1 g / 3.5 N
|
OK |
| 60 °C | -4.4% |
0.34 kg / 0.76 LBS
344.2 g / 3.4 N
|
OK |
| 80 °C | -6.6% |
0.34 kg / 0.74 LBS
336.2 g / 3.3 N
|
|
| 100 °C | -28.8% |
0.26 kg / 0.57 LBS
256.3 g / 2.5 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 3x3x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
1.24 kg / 2.72 LBS
5 677 Gs
|
0.19 kg / 0.41 LBS
185 g / 1.8 N
|
N/A |
| 1 mm |
0.63 kg / 1.38 LBS
6 725 Gs
|
0.09 kg / 0.21 LBS
94 g / 0.9 N
|
0.56 kg / 1.24 LBS
~0 Gs
|
| 2 mm |
0.27 kg / 0.60 LBS
4 447 Gs
|
0.04 kg / 0.09 LBS
41 g / 0.4 N
|
0.25 kg / 0.54 LBS
~0 Gs
|
| 3 mm |
0.12 kg / 0.26 LBS
2 903 Gs
|
0.02 kg / 0.04 LBS
18 g / 0.2 N
|
0.11 kg / 0.23 LBS
~0 Gs
|
| 5 mm |
0.02 kg / 0.05 LBS
1 324 Gs
|
0.00 kg / 0.01 LBS
4 g / 0.0 N
|
0.02 kg / 0.05 LBS
~0 Gs
|
| 10 mm |
0.00 kg / 0.00 LBS
306 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
52 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
4 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
2 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: Hazards (implants) - precautionary measures
MPL 3x3x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 2.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 1.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 1.5 cm |
| Mobile device | 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: Collisions (cracking risk) - collision effects
MPL 3x3x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
53.07 km/h
(14.74 m/s)
|
0.01 J | |
| 30 mm |
91.92 km/h
(25.53 m/s)
|
0.04 J | |
| 50 mm |
118.67 km/h
(32.96 m/s)
|
0.07 J | |
| 100 mm |
167.83 km/h
(46.62 m/s)
|
0.14 J |
Table 9: Surface protection spec
MPL 3x3x2 / 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 3x3x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 429 Mx | 4.3 µWb |
| Pc Coefficient | 0.66 | High (Stable) |
Table 11: Submerged application
MPL 3x3x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.36 kg | Standard |
| Water (riverbed) |
0.41 kg
(+0.05 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Note: On a vertical surface, the magnet retains only a fraction of its max power.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) drastically limits the holding force.
3. Power loss vs temp
*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) = 0.66
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.
Elemental analysis
| 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 as well as weaknesses of Nd2Fe14B magnets.
Benefits
- They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
- Neodymium magnets are characterized by extremely resistant to loss of magnetic properties caused by external field sources,
- Thanks to the reflective finish, the surface of nickel, gold, or silver-plated gives an clean appearance,
- Neodymium magnets deliver maximum magnetic induction on a their surface, which increases force concentration,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to flexibility in shaping and the ability to customize to unusual requirements,
- Huge importance in high-tech industry – they are commonly used in hard drives, electric motors, medical equipment, also modern systems.
- Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in miniature devices
Cons
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- Limited possibility of making threads in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. It is also worth noting that small elements of these devices can disrupt the diagnostic process medical after entering the body.
- Due to complex production process, their price is relatively high,
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- on a plate made of mild steel, perfectly concentrating the magnetic field
- with a cross-section minimum 10 mm
- with an ideally smooth touching surface
- with zero gap (no coatings)
- during detachment in a direction perpendicular to the mounting surface
- at ambient temperature room level
Lifting capacity in practice – influencing factors
- Distance (between the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in force by up to 50% (this also applies to paint, corrosion or debris).
- Angle of force application – highest force is obtained only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet limits the attraction force (the magnet "punches through" it).
- Material composition – not every steel attracts identically. High carbon content weaken the interaction with the magnet.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Rough surfaces reduce efficiency.
- Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.
Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under shearing force the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet’s surface and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Operating temperature
Regular neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Implant safety
For implant holders: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.
Keep away from electronics
A powerful magnetic field interferes with the functioning of compasses in phones and navigation systems. Keep magnets close to a device to avoid breaking the sensors.
Magnets are brittle
Despite metallic appearance, neodymium is brittle and not impact-resistant. Do not hit, as the magnet may crumble into hazardous fragments.
Electronic hazard
Powerful magnetic fields can corrupt files on payment cards, hard drives, and storage devices. Stay away of at least 10 cm.
No play value
These products are not suitable for play. Accidental ingestion of multiple magnets may result in them pinching intestinal walls, which poses a severe health hazard and necessitates immediate surgery.
Warning for allergy sufferers
Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, refrain from direct skin contact or opt for encased magnets.
Caution required
Handle magnets consciously. Their immense force can shock even professionals. Be vigilant and respect their power.
Combustion hazard
Powder produced during machining of magnets is flammable. Do not drill into magnets unless you are an expert.
Hand protection
Watch your fingers. Two large magnets will join instantly with a force of several hundred kilograms, crushing everything in their path. Be careful!
