MPL 17x17x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020124
GTIN/EAN: 5906301811305
length
17 mm [±0,1 mm]
Width
17 mm [±0,1 mm]
Height
3 mm [±0,1 mm]
Weight
6.5 g
Magnetization Direction
↑ axial
Load capacity
3.22 kg / 31.54 N
Magnetic Induction
187.48 mT / 1875 Gs
Coating
[NiCuNi] Nickel
4.71 ZŁ with VAT / pcs + price for transport
3.83 ZŁ net + 23% VAT / pcs
bulk discounts:
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Product card - MPL 17x17x3 / N38 - lamellar magnet
Specification / characteristics - MPL 17x17x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020124 |
| GTIN/EAN | 5906301811305 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 17 mm [±0,1 mm] |
| Width | 17 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 6.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 3.22 kg / 31.54 N |
| Magnetic Induction ~ ? | 187.48 mT / 1875 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 |
Physical simulation of the magnet - data
These information are the direct effect of a mathematical simulation. Values rely on models for the class Nd2Fe14B. Operational parameters may differ. Please consider these calculations as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs distance) - characteristics
MPL 17x17x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1874 Gs
187.4 mT
|
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
medium risk |
| 1 mm |
1761 Gs
176.1 mT
|
2.84 kg / 6.27 lbs
2842.9 g / 27.9 N
|
medium risk |
| 2 mm |
1610 Gs
161.0 mT
|
2.38 kg / 5.24 lbs
2376.8 g / 23.3 N
|
medium risk |
| 3 mm |
1440 Gs
144.0 mT
|
1.90 kg / 4.19 lbs
1901.0 g / 18.6 N
|
safe |
| 5 mm |
1099 Gs
109.9 mT
|
1.11 kg / 2.44 lbs
1107.5 g / 10.9 N
|
safe |
| 10 mm |
508 Gs
50.8 mT
|
0.24 kg / 0.52 lbs
236.4 g / 2.3 N
|
safe |
| 15 mm |
245 Gs
24.5 mT
|
0.06 kg / 0.12 lbs
55.2 g / 0.5 N
|
safe |
| 20 mm |
131 Gs
13.1 mT
|
0.02 kg / 0.03 lbs
15.7 g / 0.2 N
|
safe |
| 30 mm |
48 Gs
4.8 mT
|
0.00 kg / 0.00 lbs
2.1 g / 0.0 N
|
safe |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
safe |
Table 2: Vertical load (wall)
MPL 17x17x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.64 kg / 1.42 lbs
644.0 g / 6.3 N
|
| 1 mm | Stal (~0.2) |
0.57 kg / 1.25 lbs
568.0 g / 5.6 N
|
| 2 mm | Stal (~0.2) |
0.48 kg / 1.05 lbs
476.0 g / 4.7 N
|
| 3 mm | Stal (~0.2) |
0.38 kg / 0.84 lbs
380.0 g / 3.7 N
|
| 5 mm | Stal (~0.2) |
0.22 kg / 0.49 lbs
222.0 g / 2.2 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.11 lbs
48.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
12.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 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 17x17x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.97 kg / 2.13 lbs
966.0 g / 9.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.64 kg / 1.42 lbs
644.0 g / 6.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.32 kg / 0.71 lbs
322.0 g / 3.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.61 kg / 3.55 lbs
1610.0 g / 15.8 N
|
Table 4: Material efficiency (saturation) - power losses
MPL 17x17x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.32 kg / 0.71 lbs
322.0 g / 3.2 N
|
| 1 mm |
|
0.81 kg / 1.77 lbs
805.0 g / 7.9 N
|
| 2 mm |
|
1.61 kg / 3.55 lbs
1610.0 g / 15.8 N
|
| 3 mm |
|
2.42 kg / 5.32 lbs
2415.0 g / 23.7 N
|
| 5 mm |
|
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
| 10 mm |
|
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
| 11 mm |
|
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
| 12 mm |
|
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
Table 5: Thermal stability (stability) - power drop
MPL 17x17x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
3.22 kg / 7.10 lbs
3220.0 g / 31.6 N
|
OK |
| 40 °C | -2.2% |
3.15 kg / 6.94 lbs
3149.2 g / 30.9 N
|
OK |
| 60 °C | -4.4% |
3.08 kg / 6.79 lbs
3078.3 g / 30.2 N
|
|
| 80 °C | -6.6% |
3.01 kg / 6.63 lbs
3007.5 g / 29.5 N
|
|
| 100 °C | -28.8% |
2.29 kg / 5.05 lbs
2292.6 g / 22.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - forces in the system
MPL 17x17x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
6.26 kg / 13.80 lbs
3 313 Gs
|
0.94 kg / 2.07 lbs
939 g / 9.2 N
|
N/A |
| 1 mm |
5.93 kg / 13.07 lbs
3 648 Gs
|
0.89 kg / 1.96 lbs
889 g / 8.7 N
|
5.33 kg / 11.76 lbs
~0 Gs
|
| 2 mm |
5.53 kg / 12.19 lbs
3 523 Gs
|
0.83 kg / 1.83 lbs
829 g / 8.1 N
|
4.97 kg / 10.97 lbs
~0 Gs
|
| 3 mm |
5.08 kg / 11.21 lbs
3 379 Gs
|
0.76 kg / 1.68 lbs
763 g / 7.5 N
|
4.58 kg / 10.09 lbs
~0 Gs
|
| 5 mm |
4.15 kg / 9.16 lbs
3 053 Gs
|
0.62 kg / 1.37 lbs
623 g / 6.1 N
|
3.74 kg / 8.24 lbs
~0 Gs
|
| 10 mm |
2.15 kg / 4.75 lbs
2 199 Gs
|
0.32 kg / 0.71 lbs
323 g / 3.2 N
|
1.94 kg / 4.27 lbs
~0 Gs
|
| 20 mm |
0.46 kg / 1.01 lbs
1 016 Gs
|
0.07 kg / 0.15 lbs
69 g / 0.7 N
|
0.41 kg / 0.91 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 lbs
153 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.02 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.01 lbs
96 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
64 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
44 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
32 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
24 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 17x17x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.5 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Collisions (kinetic energy) - warning
MPL 17x17x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
23.45 km/h
(6.52 m/s)
|
0.14 J | |
| 30 mm |
38.89 km/h
(10.80 m/s)
|
0.38 J | |
| 50 mm |
50.19 km/h
(13.94 m/s)
|
0.63 J | |
| 100 mm |
70.98 km/h
(19.72 m/s)
|
1.26 J |
Table 9: Anti-corrosion coating durability
MPL 17x17x3 / 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 17x17x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 509 Mx | 65.1 µWb |
| Pc Coefficient | 0.23 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 17x17x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 3.22 kg | Standard |
| Water (riverbed) |
3.69 kg
(+0.47 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just approx. 20-30% of its max power.
2. Efficiency vs thickness
*Thin metal sheet (e.g. 0.5mm PC case) severely weakens the holding force.
3. Thermal stability
*For standard magnets, the critical limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.23
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% |
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
Strengths and weaknesses of neodymium magnets.
Strengths
- They virtually do not lose power, because even after 10 years the performance loss is only ~1% (according to literature),
- Magnets effectively resist against loss of magnetization caused by ambient magnetic noise,
- By using a reflective coating of gold, the element acquires an aesthetic look,
- They feature high magnetic induction at the operating surface, which improves attraction properties,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
- Considering the ability of precise shaping and adaptation to specialized projects, neodymium magnets can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
- Versatile presence in modern industrial fields – they are used in magnetic memories, electric motors, medical equipment, as well as complex engineering applications.
- Thanks to concentrated force, small magnets offer high operating force, in miniature format,
Limitations
- They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- Limited possibility of creating nuts in the magnet and complex forms - preferred is cover - mounting mechanism.
- Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Additionally, tiny parts of these devices are able to disrupt the diagnostic process medical in case of swallowing.
- Due to neodymium price, their price is higher than average,
Holding force characteristics
Maximum holding power of the magnet – what it depends on?
- on a block made of structural steel, optimally conducting the magnetic field
- whose thickness is min. 10 mm
- characterized by even structure
- with total lack of distance (without coatings)
- for force acting at a right angle (pull-off, not shear)
- at room temperature
Practical lifting capacity: influencing factors
- Distance – the presence of any layer (paint, dirt, air) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
- Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, 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 passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is pure iron steel. Hardened steels may have worse magnetic properties.
- Base smoothness – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
- Thermal factor – high temperature reduces pulling force. Too high temperature can permanently damage the magnet.
Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. In addition, even a small distance between the magnet and the plate lowers the lifting capacity.
Precautions when working with NdFeB magnets
Skin irritation risks
Certain individuals suffer from a contact allergy to Ni, which is the standard coating for NdFeB magnets. Extended handling may cause an allergic reaction. We strongly advise use protective gloves.
Immense force
Before starting, read the rules. Sudden snapping can break the magnet or injure your hand. Think ahead.
Keep away from children
Absolutely keep magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets connecting inside the body are fatal.
Magnets are brittle
NdFeB magnets are sintered ceramics, which means they are very brittle. Impact of two magnets will cause them cracking into shards.
ICD Warning
Medical warning: Strong magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Thermal limits
Regular neodymium magnets (N-type) undergo demagnetization when the temperature surpasses 80°C. Damage is permanent.
Electronic hazard
Data protection: Strong magnets can ruin data carriers and sensitive devices (pacemakers, hearing aids, mechanical watches).
Serious injuries
Risk of injury: The pulling power is so immense that it can result in blood blisters, pinching, and even bone fractures. Protective gloves are recommended.
Flammability
Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this risks ignition.
Threat to navigation
An intense magnetic field negatively affects the functioning of compasses in phones and navigation systems. Do not bring magnets close to a smartphone to avoid breaking the sensors.
