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
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Technical data 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 analysis of the product - data
The following data are the outcome of a engineering analysis. Values are based on models for the material Nd2Fe14B. Real-world conditions might slightly differ. Treat these data as a supplementary guide when designing systems.
Table 1: Static force (pull vs gap) - interaction chart
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 load (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: Vertical assembly (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 (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) - thermal limit
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) - field collision
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 |
| 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: 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: 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. Shear force
*Warning: On a vertical surface, the magnet retains just ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.
3. Thermal stability
*For standard magnets, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.40
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.
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other offers
Advantages as well as disadvantages of rare earth magnets.
Strengths
- Their magnetic field is durable, and after approximately 10 years it decreases only by ~1% (theoretically),
- They maintain their magnetic properties even under strong external field,
- The use of an refined finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Magnets are distinguished by maximum magnetic induction on the active area,
- Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
- Considering the potential of precise molding and adaptation to specialized projects, magnetic components can be created in a broad palette of shapes and sizes, which amplifies use scope,
- Universal use in advanced technology sectors – they are commonly used in data components, motor assemblies, diagnostic systems, also industrial machines.
- Thanks to their power density, small magnets offer high operating force, in miniature format,
Cons
- At very strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend 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
- Due to limitations in creating threads and complicated forms in magnets, we propose using cover - magnetic mechanism.
- Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
- Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications
Holding force characteristics
Detachment force of the magnet in optimal conditions – what contributes to it?
- on a block made of mild steel, perfectly concentrating the magnetic flux
- possessing a thickness of min. 10 mm to avoid saturation
- characterized by even structure
- with zero gap (no impurities)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Key elements affecting lifting force
- Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
- Angle of force application – maximum parameter is reached only during perpendicular pulling. The force required to slide of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
- Plate thickness – too thin steel does not close the flux, causing part of the power to be escaped into the air.
- Chemical composition of the base – low-carbon steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
- Thermal factor – high temperature weakens magnetic field. Too high temperature can permanently damage the magnet.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. Moreover, even a small distance between the magnet and the plate decreases the lifting capacity.
Safe handling of neodymium magnets
Material brittleness
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Clashing of two magnets will cause them shattering into shards.
Physical harm
Watch your fingers. Two large magnets will join instantly with a force of massive weight, crushing everything in their path. Exercise extreme caution!
Keep away from electronics
Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the sensors in your phone.
Protect data
Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, medical aids, mechanical watches).
Flammability
Mechanical processing of neodymium magnets poses a fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Conscious usage
Be careful. Rare earth magnets attract from a long distance and snap with massive power, often faster than you can react.
Keep away from children
Absolutely store magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are tragic.
Medical implants
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Do not approach if you have medical devices.
Nickel coating and allergies
A percentage of the population suffer from a sensitization to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in an allergic reaction. We recommend use protective gloves.
Demagnetization risk
Regular neodymium magnets (grade N) lose magnetization when the temperature goes above 80°C. This process is irreversible.
