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
bulk discounts:
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Technical of the product - 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 |
Technical simulation of the magnet - report
The following data are the outcome of a engineering calculation. Values were calculated on algorithms for the class Nd2Fe14B. Real-world conditions may differ from theoretical values. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (force vs distance) - interaction chart
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 load (wall)
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: Material efficiency (saturation) - 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: Working in heat (stability) - resistance threshold
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: Two magnets (repulsion) - field collision
MPL 12x10x4 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding 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: Protective zones (implants) - precautionary measures
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 |
| Mechanical watch | 20 Gs (2.0 mT) | 3.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.0 cm |
| Remote | 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: Collisions (cracking risk) - warning
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: Construction 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: Submerged application
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
*Warning: On a vertical surface, the magnet retains just approx. 20-30% of its max power.
2. Plate thickness effect
*Thin steel (e.g. computer case) significantly weakens the holding force.
3. Power loss vs temp
*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% |
Environmental data
| 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 neodymium magnets.
Strengths
- They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
- They are noted for resistance to demagnetization induced by external field influence,
- The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
- Neodymium magnets generate maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- 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...
- In view of the possibility of precise molding and customization to unique needs, NdFeB magnets can be produced in a variety of forms and dimensions, which expands the range of possible applications,
- Huge importance in modern industrial fields – they find application in data components, drive modules, precision medical tools, as well as multitasking production systems.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Weaknesses
- To avoid cracks under impact, we recommend using special steel housings. Such a solution protects 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.
- When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- We recommend casing - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated forms.
- Potential hazard resulting from small fragments of magnets are risky, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these products are able to be problematic in diagnostics medical after entering the body.
- Due to neodymium price, their price is relatively high,
Pull force analysis
Maximum lifting capacity of the magnet – what affects it?
- with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
- with a cross-section of at least 10 mm
- with an polished touching surface
- with direct contact (without impurities)
- during pulling in a direction vertical to the plane
- at ambient temperature room level
Key elements affecting lifting force
- Distance (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be escaped to the other side.
- Metal type – not every steel reacts the same. Alloy additives worsen the attraction effect.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
- Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).
Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, whereas under shearing force the lifting capacity is smaller. In addition, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.
Precautions when working with NdFeB magnets
Phone sensors
GPS units and smartphones are extremely sensitive to magnetism. Close proximity with a strong magnet can ruin the internal compass in your phone.
Medical implants
Warning for patients: Strong magnetic fields affect electronics. Keep at least 30 cm distance or ask another person to work with the magnets.
Maximum temperature
Watch the temperature. Heating the magnet to high heat will ruin its properties and pulling force.
Dust is flammable
Powder created during machining of magnets is flammable. Do not drill into magnets unless you are an expert.
Powerful field
Before starting, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Crushing force
Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.
This is not a toy
Always keep magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.
Data carriers
Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Maintain a gap of at least 10 cm.
Sensitization to coating
Certain individuals experience a hypersensitivity to Ni, which is the typical protective layer for neodymium magnets. Frequent touching can result in an allergic reaction. We suggest wear safety gloves.
Protective goggles
Neodymium magnets are ceramic materials, meaning they are very brittle. Collision of two magnets leads to them breaking into small pieces.
