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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Physical properties - 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 modeling of the assembly - data
The following data are the outcome of a engineering calculation. Values were calculated on algorithms for the material Nd2Fe14B. Actual performance might slightly differ. Use these data as a reference point for designers.
Table 1: Static force (pull vs distance) - interaction chart
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 pounds
3220.0 g / 31.6 N
|
strong |
| 1 mm |
1761 Gs
176.1 mT
|
2.84 kg / 6.27 pounds
2842.9 g / 27.9 N
|
strong |
| 2 mm |
1610 Gs
161.0 mT
|
2.38 kg / 5.24 pounds
2376.8 g / 23.3 N
|
strong |
| 3 mm |
1440 Gs
144.0 mT
|
1.90 kg / 4.19 pounds
1901.0 g / 18.6 N
|
safe |
| 5 mm |
1099 Gs
109.9 mT
|
1.11 kg / 2.44 pounds
1107.5 g / 10.9 N
|
safe |
| 10 mm |
508 Gs
50.8 mT
|
0.24 kg / 0.52 pounds
236.4 g / 2.3 N
|
safe |
| 15 mm |
245 Gs
24.5 mT
|
0.06 kg / 0.12 pounds
55.2 g / 0.5 N
|
safe |
| 20 mm |
131 Gs
13.1 mT
|
0.02 kg / 0.03 pounds
15.7 g / 0.2 N
|
safe |
| 30 mm |
48 Gs
4.8 mT
|
0.00 kg / 0.00 pounds
2.1 g / 0.0 N
|
safe |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.1 g / 0.0 N
|
safe |
Table 2: Vertical capacity (vertical surface)
MPL 17x17x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.64 kg / 1.42 pounds
644.0 g / 6.3 N
|
| 1 mm | Stal (~0.2) |
0.57 kg / 1.25 pounds
568.0 g / 5.6 N
|
| 2 mm | Stal (~0.2) |
0.48 kg / 1.05 pounds
476.0 g / 4.7 N
|
| 3 mm | Stal (~0.2) |
0.38 kg / 0.84 pounds
380.0 g / 3.7 N
|
| 5 mm | Stal (~0.2) |
0.22 kg / 0.49 pounds
222.0 g / 2.2 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.11 pounds
48.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
12.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - 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 pounds
966.0 g / 9.5 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.64 kg / 1.42 pounds
644.0 g / 6.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.32 kg / 0.71 pounds
322.0 g / 3.2 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.61 kg / 3.55 pounds
1610.0 g / 15.8 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 17x17x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.32 kg / 0.71 pounds
322.0 g / 3.2 N
|
| 1 mm |
|
0.81 kg / 1.77 pounds
805.0 g / 7.9 N
|
| 2 mm |
|
1.61 kg / 3.55 pounds
1610.0 g / 15.8 N
|
| 3 mm |
|
2.42 kg / 5.32 pounds
2415.0 g / 23.7 N
|
| 5 mm |
|
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
| 10 mm |
|
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
| 11 mm |
|
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
| 12 mm |
|
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
Table 5: Working in heat (stability) - resistance threshold
MPL 17x17x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
3.22 kg / 7.10 pounds
3220.0 g / 31.6 N
|
OK |
| 40 °C | -2.2% |
3.15 kg / 6.94 pounds
3149.2 g / 30.9 N
|
OK |
| 60 °C | -4.4% |
3.08 kg / 6.79 pounds
3078.3 g / 30.2 N
|
|
| 80 °C | -6.6% |
3.01 kg / 6.63 pounds
3007.5 g / 29.5 N
|
|
| 100 °C | -28.8% |
2.29 kg / 5.05 pounds
2292.6 g / 22.5 N
|
Table 6: Two magnets (repulsion) - field range
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 pounds
3 313 Gs
|
0.94 kg / 2.07 pounds
939 g / 9.2 N
|
N/A |
| 1 mm |
5.93 kg / 13.07 pounds
3 648 Gs
|
0.89 kg / 1.96 pounds
889 g / 8.7 N
|
5.33 kg / 11.76 pounds
~0 Gs
|
| 2 mm |
5.53 kg / 12.19 pounds
3 523 Gs
|
0.83 kg / 1.83 pounds
829 g / 8.1 N
|
4.97 kg / 10.97 pounds
~0 Gs
|
| 3 mm |
5.08 kg / 11.21 pounds
3 379 Gs
|
0.76 kg / 1.68 pounds
763 g / 7.5 N
|
4.58 kg / 10.09 pounds
~0 Gs
|
| 5 mm |
4.15 kg / 9.16 pounds
3 053 Gs
|
0.62 kg / 1.37 pounds
623 g / 6.1 N
|
3.74 kg / 8.24 pounds
~0 Gs
|
| 10 mm |
2.15 kg / 4.75 pounds
2 199 Gs
|
0.32 kg / 0.71 pounds
323 g / 3.2 N
|
1.94 kg / 4.27 pounds
~0 Gs
|
| 20 mm |
0.46 kg / 1.01 pounds
1 016 Gs
|
0.07 kg / 0.15 pounds
69 g / 0.7 N
|
0.41 kg / 0.91 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.02 pounds
153 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.02 pounds
~0 Gs
|
| 60 mm |
0.00 kg / 0.01 pounds
96 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 pounds
64 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
44 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
32 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (implants) - precautionary measures
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 |
| Timepiece | 20 Gs (2.0 mT) | 4.5 cm |
| Mobile device | 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: Impact energy (cracking risk) - 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: Coating parameters (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 (Flux)
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. Sliding resistance
*Warning: On a vertical wall, the magnet holds only a fraction of its nominal pull.
2. Plate thickness effect
*Thin metal sheet (e.g. 0.5mm PC case) severely limits the holding force.
3. Temperature resistance
*For N38 material, 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
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.
Chemical composition
| 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 as well as disadvantages of Nd2Fe14B magnets.
Pros
- They do not lose strength, even after approximately ten years – the reduction in lifting capacity is only ~1% (according to tests),
- They maintain their magnetic properties even under close interference source,
- By covering with a shiny layer of nickel, the element has an proper look,
- They are known for high magnetic induction at the operating surface, making them more effective,
- Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
- Thanks to modularity in forming and the ability to modify to individual projects,
- Huge importance in modern technologies – they serve a role in hard drives, brushless drives, precision medical tools, and complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which allows their use in compact constructions
Cons
- To avoid cracks under impact, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- Limited possibility of creating nuts in the magnet and complicated shapes - recommended is a housing - magnetic holder.
- Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products can disrupt the diagnostic process medical in case of swallowing.
- With budget limitations the cost of neodymium magnets can be a barrier,
Pull force analysis
Maximum magnetic pulling force – what contributes to it?
- using a plate made of low-carbon steel, serving as a ideal flux conductor
- whose transverse dimension is min. 10 mm
- with an polished contact surface
- with total lack of distance (no impurities)
- under perpendicular force direction (90-degree angle)
- at standard ambient temperature
Determinants of lifting force in real conditions
- Distance – the presence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Metal type – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface quality – the more even the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
- Temperature – temperature increase results in weakening of force. Check the maximum operating temperature for a given model.
Holding force was tested on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a slight gap between the magnet’s surface and the plate reduces the lifting capacity.
Precautions when working with NdFeB magnets
Life threat
For implant holders: Strong magnetic fields affect electronics. Maintain minimum 30 cm distance or request help to work with the magnets.
Demagnetization risk
Keep cool. NdFeB magnets are susceptible to heat. If you need resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
Do not give to children
Adult use only. Small elements pose a choking risk, leading to severe trauma. Store away from children and animals.
Material brittleness
Watch out for shards. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
Safe operation
Handle with care. Neodymium magnets attract from a distance and snap with huge force, often faster than you can react.
Sensitization to coating
A percentage of the population have a contact allergy to nickel, which is the standard coating for neodymium magnets. Frequent touching may cause an allergic reaction. It is best to use safety gloves.
Keep away from computers
Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and erase data from cards.
Do not drill into magnets
Mechanical processing of neodymium magnets poses a fire hazard. Magnetic powder reacts violently with oxygen and is hard to extinguish.
Threat to navigation
An intense magnetic field interferes with the functioning of compasses in smartphones and GPS navigation. Do not bring magnets close to a device to prevent damaging the sensors.
Hand protection
Large magnets can break fingers instantly. Do not place your hand betwixt two strong magnets.
