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 parameters - 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 |
Physical simulation of the magnet - data
Presented values are the direct effect of a mathematical simulation. Values were calculated on models for the material Nd2Fe14B. Actual parameters may differ. Treat these calculations as a preliminary roadmap when designing systems.
Table 1: Static force (pull vs gap) - characteristics
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 pounds
90530.0 g / 888.1 N
|
critical level |
| 1 mm |
3999 Gs
399.9 mT
|
84.79 kg / 186.94 pounds
84794.0 g / 831.8 N
|
critical level |
| 2 mm |
3861 Gs
386.1 mT
|
79.04 kg / 174.25 pounds
79038.6 g / 775.4 N
|
critical level |
| 3 mm |
3720 Gs
372.0 mT
|
73.38 kg / 161.78 pounds
73381.8 g / 719.9 N
|
critical level |
| 5 mm |
3435 Gs
343.5 mT
|
62.56 kg / 137.93 pounds
62564.2 g / 613.8 N
|
critical level |
| 10 mm |
2742 Gs
274.2 mT
|
39.87 kg / 87.90 pounds
39868.7 g / 391.1 N
|
critical level |
| 15 mm |
2137 Gs
213.7 mT
|
24.21 kg / 53.37 pounds
24210.4 g / 237.5 N
|
critical level |
| 20 mm |
1649 Gs
164.9 mT
|
14.41 kg / 31.77 pounds
14409.9 g / 141.4 N
|
critical level |
| 30 mm |
988 Gs
98.8 mT
|
5.17 kg / 11.40 pounds
5170.9 g / 50.7 N
|
warning |
| 50 mm |
399 Gs
39.9 mT
|
0.85 kg / 1.86 pounds
845.8 g / 8.3 N
|
safe |
Table 2: Sliding hold (wall)
MPL 50x50x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
|
| 1 mm | Stal (~0.2) |
16.96 kg / 37.39 pounds
16958.0 g / 166.4 N
|
| 2 mm | Stal (~0.2) |
15.81 kg / 34.85 pounds
15808.0 g / 155.1 N
|
| 3 mm | Stal (~0.2) |
14.68 kg / 32.36 pounds
14676.0 g / 144.0 N
|
| 5 mm | Stal (~0.2) |
12.51 kg / 27.58 pounds
12512.0 g / 122.7 N
|
| 10 mm | Stal (~0.2) |
7.97 kg / 17.58 pounds
7974.0 g / 78.2 N
|
| 15 mm | Stal (~0.2) |
4.84 kg / 10.67 pounds
4842.0 g / 47.5 N
|
| 20 mm | Stal (~0.2) |
2.88 kg / 6.35 pounds
2882.0 g / 28.3 N
|
| 30 mm | Stal (~0.2) |
1.03 kg / 2.28 pounds
1034.0 g / 10.1 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 0.37 pounds
170.0 g / 1.7 N
|
Table 3: Wall mounting (shearing) - vertical pull
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 pounds
27159.0 g / 266.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.11 kg / 39.92 pounds
18106.0 g / 177.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.05 kg / 19.96 pounds
9053.0 g / 88.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
45.27 kg / 99.79 pounds
45265.0 g / 444.0 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 50x50x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
3.02 kg / 6.65 pounds
3017.7 g / 29.6 N
|
| 1 mm |
|
7.54 kg / 16.63 pounds
7544.2 g / 74.0 N
|
| 2 mm |
|
15.09 kg / 33.26 pounds
15088.3 g / 148.0 N
|
| 3 mm |
|
22.63 kg / 49.90 pounds
22632.5 g / 222.0 N
|
| 5 mm |
|
37.72 kg / 83.16 pounds
37720.8 g / 370.0 N
|
| 10 mm |
|
75.44 kg / 166.32 pounds
75441.7 g / 740.1 N
|
| 11 mm |
|
82.99 kg / 182.95 pounds
82985.8 g / 814.1 N
|
| 12 mm |
|
90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MPL 50x50x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
90.53 kg / 199.58 pounds
90530.0 g / 888.1 N
|
OK |
| 40 °C | -2.2% |
88.54 kg / 195.19 pounds
88538.3 g / 868.6 N
|
OK |
| 60 °C | -4.4% |
86.55 kg / 190.80 pounds
86546.7 g / 849.0 N
|
|
| 80 °C | -6.6% |
84.56 kg / 186.41 pounds
84555.0 g / 829.5 N
|
|
| 100 °C | -28.8% |
64.46 kg / 142.10 pounds
64457.4 g / 632.3 N
|
Table 6: Magnet-Magnet interaction (repulsion) - field range
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 pounds
5 403 Gs
|
39.47 kg / 87.02 pounds
39472 g / 387.2 N
|
N/A |
| 1 mm |
254.89 kg / 561.94 pounds
8 133 Gs
|
38.23 kg / 84.29 pounds
38234 g / 375.1 N
|
229.40 kg / 505.75 pounds
~0 Gs
|
| 2 mm |
246.47 kg / 543.38 pounds
7 998 Gs
|
36.97 kg / 81.51 pounds
36971 g / 362.7 N
|
221.83 kg / 489.04 pounds
~0 Gs
|
| 3 mm |
238.08 kg / 524.88 pounds
7 861 Gs
|
35.71 kg / 78.73 pounds
35713 g / 350.3 N
|
214.28 kg / 472.40 pounds
~0 Gs
|
| 5 mm |
221.48 kg / 488.27 pounds
7 582 Gs
|
33.22 kg / 73.24 pounds
33222 g / 325.9 N
|
199.33 kg / 439.45 pounds
~0 Gs
|
| 10 mm |
181.86 kg / 400.93 pounds
6 870 Gs
|
27.28 kg / 60.14 pounds
27279 g / 267.6 N
|
163.67 kg / 360.83 pounds
~0 Gs
|
| 20 mm |
115.89 kg / 255.49 pounds
5 484 Gs
|
17.38 kg / 38.32 pounds
17383 g / 170.5 N
|
104.30 kg / 229.94 pounds
~0 Gs
|
| 50 mm |
24.93 kg / 54.97 pounds
2 544 Gs
|
3.74 kg / 8.25 pounds
3740 g / 36.7 N
|
22.44 kg / 49.47 pounds
~0 Gs
|
| 60 mm |
15.03 kg / 33.14 pounds
1 975 Gs
|
2.25 kg / 4.97 pounds
2255 g / 22.1 N
|
13.53 kg / 29.82 pounds
~0 Gs
|
| 70 mm |
9.24 kg / 20.37 pounds
1 548 Gs
|
1.39 kg / 3.05 pounds
1386 g / 13.6 N
|
8.31 kg / 18.33 pounds
~0 Gs
|
| 80 mm |
5.81 kg / 12.80 pounds
1 228 Gs
|
0.87 kg / 1.92 pounds
871 g / 8.5 N
|
5.23 kg / 11.52 pounds
~0 Gs
|
| 90 mm |
3.74 kg / 8.24 pounds
985 Gs
|
0.56 kg / 1.24 pounds
560 g / 5.5 N
|
3.36 kg / 7.41 pounds
~0 Gs
|
| 100 mm |
2.46 kg / 5.42 pounds
799 Gs
|
0.37 kg / 0.81 pounds
369 g / 3.6 N
|
2.21 kg / 4.88 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - 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 |
| Mechanical watch | 20 Gs (2.0 mT) | 17.0 cm |
| Phone / Smartphone | 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: Collisions (kinetic energy) - 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: Coating parameters (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: Construction data (Pc)
MPL 50x50x25 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 105 093 Mx | 1050.9 µWb |
| Pc Coefficient | 0.54 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
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 wall, the magnet holds merely a fraction of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly 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
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
View also deals
Advantages and disadvantages of rare earth magnets.
Benefits
- They do not lose strength, even over approximately 10 years – the reduction in lifting capacity is only ~1% (according to tests),
- They do not lose their magnetic properties even under external field action,
- A magnet with a shiny gold surface has better aesthetics,
- They feature high magnetic induction at the operating surface, making them more effective,
- Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
- Thanks to the option of precise forming and customization to specialized needs, neodymium magnets can be modeled in a broad palette of geometric configurations, which amplifies use scope,
- Universal use in high-tech industry – they serve a role in computer drives, brushless drives, precision medical tools, as well as multitasking production systems.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Limitations
- To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
- Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture
- Limited ability of creating nuts in the magnet and complex forms - recommended is casing - mounting mechanism.
- Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets is a challenge,
Pull force analysis
Maximum holding power of the magnet – what affects it?
- on a base made of structural steel, perfectly concentrating the magnetic field
- with a cross-section of at least 10 mm
- with a surface perfectly flat
- under conditions of ideal adhesion (metal-to-metal)
- for force applied at a right angle (in the magnet axis)
- at ambient temperature room level
Magnet lifting force in use – key factors
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces 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 significantly, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
- Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal weaken the grip.
- Temperature influence – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.
Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under parallel forces the load capacity is reduced by as much as fivefold. In addition, even a slight gap between the magnet and the plate reduces the holding force.
Warnings
Dust explosion hazard
Mechanical processing of NdFeB material poses a fire risk. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.
Data carriers
Do not bring magnets close to a purse, computer, or screen. The magnetism can destroy these devices and wipe information from cards.
Caution required
Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.
Magnets are brittle
Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may crumble into hazardous fragments.
Bodily injuries
Watch your fingers. Two powerful magnets will snap together immediately with a force of massive weight, crushing anything in their path. Exercise extreme caution!
Operating temperature
Do not overheat. NdFeB magnets are sensitive to heat. If you require operation above 80°C, look for HT versions (H, SH, UH).
Nickel allergy
Warning for allergy sufferers: The Ni-Cu-Ni coating contains nickel. If skin irritation appears, immediately stop handling magnets and wear gloves.
Medical implants
Health Alert: Neodymium magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
GPS Danger
A strong magnetic field negatively affects the functioning of compasses in smartphones and GPS navigation. Keep magnets close to a smartphone to avoid breaking the sensors.
Choking Hazard
Absolutely keep magnets away from children. Ingestion danger is significant, and the effects of magnets connecting inside the body are very dangerous.
