MPL 50x50x25 / N38 - lamellar magnet
lamellar magnet
Catalog no 020168
GTIN/EAN: 5906301811749
length
50 mm [±0,1 mm]
Width
50 mm [±0,1 mm]
Height
25 mm [±0,1 mm]
Weight
468.75 g
Magnetization Direction
↑ axial
Load capacity
90.53 kg / 888.15 N
Magnetic Induction
413.25 mT / 4133 Gs
Coating
[NiCuNi] Nickel
159.90 ZŁ with VAT / pcs + price for transport
130.00 ZŁ net + 23% VAT / pcs
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Technical details - MPL 50x50x25 / N38 - lamellar magnet
Specification / characteristics - MPL 50x50x25 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020168 |
| GTIN/EAN | 5906301811749 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 50 mm [±0,1 mm] |
| Height | 25 mm [±0,1 mm] |
| Weight | 468.75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 90.53 kg / 888.15 N |
| Magnetic Induction ~ ? | 413.25 mT / 4133 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 - data
The following values represent the direct effect of a physical calculation. Results were calculated on algorithms for the material Nd2Fe14B. Operational performance might slightly differ. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static force (pull vs gap) - power drop
MPL 50x50x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
4132 Gs
413.2 mT
|
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
critical level |
| 1 mm |
3999 Gs
399.9 mT
|
84.79 kg / 186.94 LBS
84794.0 g / 831.8 N
|
critical level |
| 2 mm |
3861 Gs
386.1 mT
|
79.04 kg / 174.25 LBS
79038.6 g / 775.4 N
|
critical level |
| 3 mm |
3720 Gs
372.0 mT
|
73.38 kg / 161.78 LBS
73381.8 g / 719.9 N
|
critical level |
| 5 mm |
3435 Gs
343.5 mT
|
62.56 kg / 137.93 LBS
62564.2 g / 613.8 N
|
critical level |
| 10 mm |
2742 Gs
274.2 mT
|
39.87 kg / 87.90 LBS
39868.7 g / 391.1 N
|
critical level |
| 15 mm |
2137 Gs
213.7 mT
|
24.21 kg / 53.37 LBS
24210.4 g / 237.5 N
|
critical level |
| 20 mm |
1649 Gs
164.9 mT
|
14.41 kg / 31.77 LBS
14409.9 g / 141.4 N
|
critical level |
| 30 mm |
988 Gs
98.8 mT
|
5.17 kg / 11.40 LBS
5170.9 g / 50.7 N
|
medium risk |
| 50 mm |
399 Gs
39.9 mT
|
0.85 kg / 1.86 LBS
845.8 g / 8.3 N
|
safe |
Table 2: Slippage load (vertical surface)
MPL 50x50x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
|
| 1 mm | Stal (~0.2) |
16.96 kg / 37.39 LBS
16958.0 g / 166.4 N
|
| 2 mm | Stal (~0.2) |
15.81 kg / 34.85 LBS
15808.0 g / 155.1 N
|
| 3 mm | Stal (~0.2) |
14.68 kg / 32.36 LBS
14676.0 g / 144.0 N
|
| 5 mm | Stal (~0.2) |
12.51 kg / 27.58 LBS
12512.0 g / 122.7 N
|
| 10 mm | Stal (~0.2) |
7.97 kg / 17.58 LBS
7974.0 g / 78.2 N
|
| 15 mm | Stal (~0.2) |
4.84 kg / 10.67 LBS
4842.0 g / 47.5 N
|
| 20 mm | Stal (~0.2) |
2.88 kg / 6.35 LBS
2882.0 g / 28.3 N
|
| 30 mm | Stal (~0.2) |
1.03 kg / 2.28 LBS
1034.0 g / 10.1 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 0.37 LBS
170.0 g / 1.7 N
|
Table 3: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 50x50x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
27.16 kg / 59.88 LBS
27159.0 g / 266.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.11 kg / 39.92 LBS
18106.0 g / 177.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.05 kg / 19.96 LBS
9053.0 g / 88.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
45.27 kg / 99.79 LBS
45265.0 g / 444.0 N
|
Table 4: Material efficiency (substrate influence) - sheet metal selection
MPL 50x50x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
3.02 kg / 6.65 LBS
3017.7 g / 29.6 N
|
| 1 mm |
|
7.54 kg / 16.63 LBS
7544.2 g / 74.0 N
|
| 2 mm |
|
15.09 kg / 33.26 LBS
15088.3 g / 148.0 N
|
| 3 mm |
|
22.63 kg / 49.90 LBS
22632.5 g / 222.0 N
|
| 5 mm |
|
37.72 kg / 83.16 LBS
37720.8 g / 370.0 N
|
| 10 mm |
|
75.44 kg / 166.32 LBS
75441.7 g / 740.1 N
|
| 11 mm |
|
82.99 kg / 182.95 LBS
82985.8 g / 814.1 N
|
| 12 mm |
|
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
Table 5: Thermal stability (material behavior) - power drop
MPL 50x50x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
90.53 kg / 199.58 LBS
90530.0 g / 888.1 N
|
OK |
| 40 °C | -2.2% |
88.54 kg / 195.19 LBS
88538.3 g / 868.6 N
|
OK |
| 60 °C | -4.4% |
86.55 kg / 190.80 LBS
86546.7 g / 849.0 N
|
|
| 80 °C | -6.6% |
84.56 kg / 186.41 LBS
84555.0 g / 829.5 N
|
|
| 100 °C | -28.8% |
64.46 kg / 142.10 LBS
64457.4 g / 632.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field collision
MPL 50x50x25 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
263.15 kg / 580.14 LBS
5 403 Gs
|
39.47 kg / 87.02 LBS
39472 g / 387.2 N
|
N/A |
| 1 mm |
254.89 kg / 561.94 LBS
8 133 Gs
|
38.23 kg / 84.29 LBS
38234 g / 375.1 N
|
229.40 kg / 505.75 LBS
~0 Gs
|
| 2 mm |
246.47 kg / 543.38 LBS
7 998 Gs
|
36.97 kg / 81.51 LBS
36971 g / 362.7 N
|
221.83 kg / 489.04 LBS
~0 Gs
|
| 3 mm |
238.08 kg / 524.88 LBS
7 861 Gs
|
35.71 kg / 78.73 LBS
35713 g / 350.3 N
|
214.28 kg / 472.40 LBS
~0 Gs
|
| 5 mm |
221.48 kg / 488.27 LBS
7 582 Gs
|
33.22 kg / 73.24 LBS
33222 g / 325.9 N
|
199.33 kg / 439.45 LBS
~0 Gs
|
| 10 mm |
181.86 kg / 400.93 LBS
6 870 Gs
|
27.28 kg / 60.14 LBS
27279 g / 267.6 N
|
163.67 kg / 360.83 LBS
~0 Gs
|
| 20 mm |
115.89 kg / 255.49 LBS
5 484 Gs
|
17.38 kg / 38.32 LBS
17383 g / 170.5 N
|
104.30 kg / 229.94 LBS
~0 Gs
|
| 50 mm |
24.93 kg / 54.97 LBS
2 544 Gs
|
3.74 kg / 8.25 LBS
3740 g / 36.7 N
|
22.44 kg / 49.47 LBS
~0 Gs
|
| 60 mm |
15.03 kg / 33.14 LBS
1 975 Gs
|
2.25 kg / 4.97 LBS
2255 g / 22.1 N
|
13.53 kg / 29.82 LBS
~0 Gs
|
| 70 mm |
9.24 kg / 20.37 LBS
1 548 Gs
|
1.39 kg / 3.05 LBS
1386 g / 13.6 N
|
8.31 kg / 18.33 LBS
~0 Gs
|
| 80 mm |
5.81 kg / 12.80 LBS
1 228 Gs
|
0.87 kg / 1.92 LBS
871 g / 8.5 N
|
5.23 kg / 11.52 LBS
~0 Gs
|
| 90 mm |
3.74 kg / 8.24 LBS
985 Gs
|
0.56 kg / 1.24 LBS
560 g / 5.5 N
|
3.36 kg / 7.41 LBS
~0 Gs
|
| 100 mm |
2.46 kg / 5.42 LBS
799 Gs
|
0.37 kg / 0.81 LBS
369 g / 3.6 N
|
2.21 kg / 4.88 LBS
~0 Gs
|
Table 7: Hazards (implants) - warnings
MPL 50x50x25 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 28.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 22.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 17.0 cm |
| Mobile device | 40 Gs (4.0 mT) | 13.5 cm |
| Remote | 50 Gs (5.0 mT) | 12.5 cm |
| Payment card | 400 Gs (40.0 mT) | 5.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 4.5 cm |
Table 8: Impact energy (cracking risk) - collision effects
MPL 50x50x25 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
17.45 km/h
(4.85 m/s)
|
5.51 J | |
| 30 mm |
25.13 km/h
(6.98 m/s)
|
11.42 J | |
| 50 mm |
31.52 km/h
(8.76 m/s)
|
17.97 J | |
| 100 mm |
44.33 km/h
(12.31 m/s)
|
35.54 J |
Table 9: Anti-corrosion coating durability
MPL 50x50x25 / 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 50x50x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 105 093 Mx | 1050.9 µWb |
| Pc Coefficient | 0.54 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 50x50x25 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 90.53 kg | Standard |
| Water (riverbed) |
103.66 kg
(+13.13 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Steel saturation
*Thin metal sheet (e.g. computer case) severely weakens the holding force.
3. Heat tolerance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.54
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
Strengths as well as weaknesses of rare earth magnets.
Benefits
- They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
- Neodymium magnets remain remarkably resistant to loss of magnetic properties caused by external interference,
- The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to look better,
- Magnetic induction on the top side of the magnet turns out to be exceptional,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures reaching 230°C and above...
- Thanks to freedom in designing and the capacity to adapt to client solutions,
- Significant place in innovative solutions – they are used in HDD drives, drive modules, medical devices, also industrial machines.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems
Cons
- They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size and 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 start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
- Due to limitations in creating nuts and complicated shapes in magnets, we propose using cover - magnetic holder.
- Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small components of these devices can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Pull force analysis
Highest magnetic holding force – what contributes to it?
- using a sheet made of high-permeability steel, acting as a ideal flux conductor
- whose thickness equals approx. 10 mm
- with a surface free of scratches
- without any insulating layer between the magnet and steel
- under perpendicular force direction (90-degree angle)
- at temperature room level
Magnet lifting force in use – key factors
- Distance (betwixt the magnet and the plate), since even a microscopic distance (e.g. 0.5 mm) leads to a reduction in force by up to 50% (this also applies to varnish, rust or debris).
- Loading method – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of maximum force).
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
- Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
- Plate texture – ground elements ensure maximum contact, which increases force. Rough surfaces weaken the grip.
- Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently demagnetize the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, in contrast under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance between the magnet and the plate reduces the load capacity.
Warnings
Dust explosion hazard
Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this may cause fire.
Heat warning
Do not overheat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).
Magnet fragility
Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.
ICD Warning
For implant holders: Powerful magnets affect medical devices. Keep minimum 30 cm distance or request help to work with the magnets.
Pinching danger
Large magnets can crush fingers instantly. Do not place your hand betwixt two strong magnets.
Magnetic media
Avoid bringing magnets near a wallet, laptop, or screen. The magnetism can destroy these devices and erase data from cards.
Choking Hazard
These products are not toys. Swallowing a few magnets may result in them pinching intestinal walls, which constitutes a direct threat to life and requires immediate surgery.
Handling rules
Before starting, read the rules. Uncontrolled attraction can break the magnet or hurt your hand. Be predictive.
Allergy Warning
Some people experience a sensitization to nickel, which is the common plating for NdFeB magnets. Frequent touching may cause a rash. It is best to wear protective gloves.
GPS Danger
A powerful magnetic field disrupts the functioning of magnetometers in phones and navigation systems. Maintain magnets near a device to prevent breaking the sensors.
