MPL 12x10x4 / N38 - lamellar magnet
lamellar magnet
Catalog no 020118
GTIN/EAN: 5906301811244
length
12 mm [±0,1 mm]
Width
10 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
3.6 g
Magnetization Direction
↑ axial
Load capacity
3.45 kg / 33.88 N
Magnetic Induction
340.59 mT / 3406 Gs
Coating
[NiCuNi] Nickel
1.697 ZŁ with VAT / pcs + price for transport
1.380 ZŁ net + 23% VAT / pcs
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Detailed specification - MPL 12x10x4 / N38 - lamellar magnet
Specification / characteristics - MPL 12x10x4 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020118 |
| GTIN/EAN | 5906301811244 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 12 mm [±0,1 mm] |
| Width | 10 mm [±0,1 mm] |
| Height | 4 mm [±0,1 mm] |
| Weight | 3.6 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 3.45 kg / 33.88 N |
| Magnetic Induction ~ ? | 340.59 mT / 3406 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 |
Engineering simulation of the magnet - report
Presented values represent the direct effect of a engineering calculation. Values are based on algorithms for the material Nd2Fe14B. Operational parameters may differ. Please consider these calculations as a supplementary guide when designing systems.
Table 1: Static force (force vs gap) - characteristics
MPL 12x10x4 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3404 Gs
340.4 mT
|
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
medium risk |
| 1 mm |
2920 Gs
292.0 mT
|
2.54 kg / 5.60 LBS
2538.8 g / 24.9 N
|
medium risk |
| 2 mm |
2399 Gs
239.9 mT
|
1.71 kg / 3.78 LBS
1713.7 g / 16.8 N
|
safe |
| 3 mm |
1919 Gs
191.9 mT
|
1.10 kg / 2.42 LBS
1096.3 g / 10.8 N
|
safe |
| 5 mm |
1190 Gs
119.0 mT
|
0.42 kg / 0.93 LBS
421.6 g / 4.1 N
|
safe |
| 10 mm |
392 Gs
39.2 mT
|
0.05 kg / 0.10 LBS
45.7 g / 0.4 N
|
safe |
| 15 mm |
162 Gs
16.2 mT
|
0.01 kg / 0.02 LBS
7.8 g / 0.1 N
|
safe |
| 20 mm |
80 Gs
8.0 mT
|
0.00 kg / 0.00 LBS
1.9 g / 0.0 N
|
safe |
| 30 mm |
27 Gs
2.7 mT
|
0.00 kg / 0.00 LBS
0.2 g / 0.0 N
|
safe |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 LBS
0.0 g / 0.0 N
|
safe |
Table 2: Slippage hold (vertical surface)
MPL 12x10x4 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.69 kg / 1.52 LBS
690.0 g / 6.8 N
|
| 1 mm | Stal (~0.2) |
0.51 kg / 1.12 LBS
508.0 g / 5.0 N
|
| 2 mm | Stal (~0.2) |
0.34 kg / 0.75 LBS
342.0 g / 3.4 N
|
| 3 mm | Stal (~0.2) |
0.22 kg / 0.49 LBS
220.0 g / 2.2 N
|
| 5 mm | Stal (~0.2) |
0.08 kg / 0.19 LBS
84.0 g / 0.8 N
|
| 10 mm | Stal (~0.2) |
0.01 kg / 0.02 LBS
10.0 g / 0.1 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 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 (sliding) - vertical pull
MPL 12x10x4 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.04 kg / 2.28 LBS
1035.0 g / 10.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.69 kg / 1.52 LBS
690.0 g / 6.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.35 kg / 0.76 LBS
345.0 g / 3.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.73 kg / 3.80 LBS
1725.0 g / 16.9 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 12x10x4 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.35 kg / 0.76 LBS
345.0 g / 3.4 N
|
| 1 mm |
|
0.86 kg / 1.90 LBS
862.5 g / 8.5 N
|
| 2 mm |
|
1.73 kg / 3.80 LBS
1725.0 g / 16.9 N
|
| 3 mm |
|
2.59 kg / 5.70 LBS
2587.5 g / 25.4 N
|
| 5 mm |
|
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
| 10 mm |
|
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
| 11 mm |
|
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
| 12 mm |
|
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
Table 5: Thermal resistance (material behavior) - power drop
MPL 12x10x4 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
3.45 kg / 7.61 LBS
3450.0 g / 33.8 N
|
OK |
| 40 °C | -2.2% |
3.37 kg / 7.44 LBS
3374.1 g / 33.1 N
|
OK |
| 60 °C | -4.4% |
3.30 kg / 7.27 LBS
3298.2 g / 32.4 N
|
|
| 80 °C | -6.6% |
3.22 kg / 7.10 LBS
3222.3 g / 31.6 N
|
|
| 100 °C | -28.8% |
2.46 kg / 5.42 LBS
2456.4 g / 24.1 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
MPL 12x10x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
8.57 kg / 18.90 LBS
4 915 Gs
|
1.29 kg / 2.84 LBS
1286 g / 12.6 N
|
N/A |
| 1 mm |
7.46 kg / 16.44 LBS
6 349 Gs
|
1.12 kg / 2.47 LBS
1118 g / 11.0 N
|
6.71 kg / 14.79 LBS
~0 Gs
|
| 2 mm |
6.31 kg / 13.91 LBS
5 841 Gs
|
0.95 kg / 2.09 LBS
946 g / 9.3 N
|
5.68 kg / 12.52 LBS
~0 Gs
|
| 3 mm |
5.23 kg / 11.53 LBS
5 317 Gs
|
0.78 kg / 1.73 LBS
784 g / 7.7 N
|
4.71 kg / 10.37 LBS
~0 Gs
|
| 5 mm |
3.42 kg / 7.55 LBS
4 302 Gs
|
0.51 kg / 1.13 LBS
513 g / 5.0 N
|
3.08 kg / 6.79 LBS
~0 Gs
|
| 10 mm |
1.05 kg / 2.31 LBS
2 380 Gs
|
0.16 kg / 0.35 LBS
157 g / 1.5 N
|
0.94 kg / 2.08 LBS
~0 Gs
|
| 20 mm |
0.11 kg / 0.25 LBS
784 Gs
|
0.02 kg / 0.04 LBS
17 g / 0.2 N
|
0.10 kg / 0.23 LBS
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 LBS
90 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
55 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
36 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
25 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
18 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
13 Gs
|
0.00 kg / 0.00 LBS
0 g / 0.0 N
|
0.00 kg / 0.00 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
MPL 12x10x4 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 3.0 cm |
| Car key | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (kinetic energy) - collision effects
MPL 12x10x4 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
31.48 km/h
(8.74 m/s)
|
0.14 J | |
| 30 mm |
54.08 km/h
(15.02 m/s)
|
0.41 J | |
| 50 mm |
69.81 km/h
(19.39 m/s)
|
0.68 J | |
| 100 mm |
98.73 km/h
(27.42 m/s)
|
1.35 J |
Table 9: Anti-corrosion coating durability
MPL 12x10x4 / 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 12x10x4 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 4 295 Mx | 42.9 µWb |
| Pc Coefficient | 0.43 | Low (Flat) |
Table 11: Hydrostatics and buoyancy
MPL 12x10x4 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 3.45 kg | Standard |
| Water (riverbed) |
3.95 kg
(+0.50 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Caution: On a vertical wall, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Efficiency vs thickness
*Thin steel (e.g. computer case) drastically reduces the holding force.
3. Temperature resistance
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.43
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Advantages and disadvantages of rare earth magnets.
Pros
- They do not lose power, even during around ten years – the reduction in strength is only ~1% (according to tests),
- They do not lose their magnetic properties even under strong external field,
- The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to present itself better,
- Magnets are characterized by exceptionally strong magnetic induction on the working surface,
- Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
- Due to the ability of accurate forming and customization to specialized requirements, neodymium magnets can be created in a variety of geometric configurations, which amplifies use scope,
- Key role in electronics industry – they are commonly used in computer drives, drive modules, precision medical tools, also modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Cons
- Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
- NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in realizing threads and complicated forms in magnets, we propose using cover - magnetic mount.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets can complicate diagnosis medical in case of swallowing.
- With budget limitations the cost of neodymium magnets is a challenge,
Pull force analysis
Magnetic strength at its maximum – what contributes to it?
- with the application of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
- whose thickness is min. 10 mm
- with a plane free of scratches
- without any insulating layer between the magnet and steel
- during detachment in a direction perpendicular to the mounting surface
- in temp. approx. 20°C
Determinants of lifting force in real conditions
- Space between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
- Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Chemical composition of the base – mild steel attracts best. Alloy steels decrease magnetic permeability and holding force.
- Surface condition – smooth surfaces ensure maximum contact, which improves force. Rough surfaces weaken the grip.
- Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a small distance between the magnet’s surface and the plate lowers the holding force.
Safe handling of NdFeB magnets
Fire risk
Fire warning: Neodymium dust is explosive. Do not process magnets without safety gear as this may cause fire.
Operating temperature
Standard neodymium magnets (N-type) lose magnetization when the temperature exceeds 80°C. Damage is permanent.
Protect data
Powerful magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Medical interference
Health Alert: Neodymium magnets can deactivate heart devices and defibrillators. Do not approach if you have electronic implants.
Handling rules
Before starting, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Serious injuries
Danger of trauma: The pulling power is so immense that it can result in hematomas, pinching, and even bone fractures. Protective gloves are recommended.
Danger to the youngest
Only for adults. Small elements can be swallowed, leading to serious injuries. Store away from kids and pets.
Warning for allergy sufferers
Medical facts indicate that the nickel plating (standard magnet coating) is a potent allergen. If you have an allergy, refrain from touching magnets with bare hands and opt for coated magnets.
GPS and phone interference
An intense magnetic field negatively affects the operation of compasses in phones and GPS navigation. Do not bring magnets near a smartphone to prevent breaking the sensors.
Fragile material
Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. Wear goggles.
