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 - 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 |
Technical simulation of the product - data
These values are the direct effect of a engineering calculation. Values rely on algorithms for the class Nd2Fe14B. Real-world conditions may differ. Please consider these data as a preliminary roadmap during assembly planning.
Table 1: Static force (force vs gap) - interaction chart
MPL 50x50x25 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg) | Risk Status |
|---|---|---|---|
| 0 mm |
4132 Gs
413.2 mT
|
90.53 kg / 90530.0 g
888.1 N
|
crushing |
| 1 mm |
3999 Gs
399.9 mT
|
84.79 kg / 84794.0 g
831.8 N
|
crushing |
| 2 mm |
3861 Gs
386.1 mT
|
79.04 kg / 79038.6 g
775.4 N
|
crushing |
| 3 mm |
3720 Gs
372.0 mT
|
73.38 kg / 73381.8 g
719.9 N
|
crushing |
| 5 mm |
3435 Gs
343.5 mT
|
62.56 kg / 62564.2 g
613.8 N
|
crushing |
| 10 mm |
2742 Gs
274.2 mT
|
39.87 kg / 39868.7 g
391.1 N
|
crushing |
| 15 mm |
2137 Gs
213.7 mT
|
24.21 kg / 24210.4 g
237.5 N
|
crushing |
| 20 mm |
1649 Gs
164.9 mT
|
14.41 kg / 14409.9 g
141.4 N
|
crushing |
| 30 mm |
988 Gs
98.8 mT
|
5.17 kg / 5170.9 g
50.7 N
|
warning |
| 50 mm |
399 Gs
39.9 mT
|
0.85 kg / 845.8 g
8.3 N
|
low risk |
Table 2: Shear hold (vertical surface)
MPL 50x50x25 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg) |
|---|---|---|
| 0 mm | Stal (~0.2) |
18.11 kg / 18106.0 g
177.6 N
|
| 1 mm | Stal (~0.2) |
16.96 kg / 16958.0 g
166.4 N
|
| 2 mm | Stal (~0.2) |
15.81 kg / 15808.0 g
155.1 N
|
| 3 mm | Stal (~0.2) |
14.68 kg / 14676.0 g
144.0 N
|
| 5 mm | Stal (~0.2) |
12.51 kg / 12512.0 g
122.7 N
|
| 10 mm | Stal (~0.2) |
7.97 kg / 7974.0 g
78.2 N
|
| 15 mm | Stal (~0.2) |
4.84 kg / 4842.0 g
47.5 N
|
| 20 mm | Stal (~0.2) |
2.88 kg / 2882.0 g
28.3 N
|
| 30 mm | Stal (~0.2) |
1.03 kg / 1034.0 g
10.1 N
|
| 50 mm | Stal (~0.2) |
0.17 kg / 170.0 g
1.7 N
|
Table 3: Wall mounting (shearing) - vertical pull
MPL 50x50x25 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
27.16 kg / 27159.0 g
266.4 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
18.11 kg / 18106.0 g
177.6 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
9.05 kg / 9053.0 g
88.8 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
45.27 kg / 45265.0 g
444.0 N
|
Table 4: Steel thickness (substrate influence) - sheet metal selection
MPL 50x50x25 / N38
| Steel thickness (mm) | % power | Real pull force (kg) |
|---|---|---|
| 0.5 mm |
|
3.02 kg / 3017.7 g
29.6 N
|
| 1 mm |
|
7.54 kg / 7544.2 g
74.0 N
|
| 2 mm |
|
15.09 kg / 15088.3 g
148.0 N
|
| 5 mm |
|
37.72 kg / 37720.8 g
370.0 N
|
| 10 mm |
|
75.44 kg / 75441.7 g
740.1 N
|
Table 5: Working in heat (stability) - resistance threshold
MPL 50x50x25 / N38
| Ambient temp. (°C) | Power loss | Remaining pull | Status |
|---|---|---|---|
| 20 °C | 0.0% |
90.53 kg / 90530.0 g
888.1 N
|
OK |
| 40 °C | -2.2% |
88.54 kg / 88538.3 g
868.6 N
|
OK |
| 60 °C | -4.4% |
86.55 kg / 86546.7 g
849.0 N
|
|
| 80 °C | -6.6% |
84.56 kg / 84555.0 g
829.5 N
|
|
| 100 °C | -28.8% |
64.46 kg / 64457.4 g
632.3 N
|
Table 6: Two magnets (attraction) - field range
MPL 50x50x25 / N38
| Gap (mm) | Attraction (kg) (N-S) | Repulsion (kg) (N-N) |
|---|---|---|
| 0 mm |
263.15 kg / 263147 g
2581.5 N
5 403 Gs
|
N/A |
| 1 mm |
254.89 kg / 254892 g
2500.5 N
8 133 Gs
|
229.40 kg / 229403 g
2250.4 N
~0 Gs
|
| 2 mm |
246.47 kg / 246473 g
2417.9 N
7 998 Gs
|
221.83 kg / 221826 g
2176.1 N
~0 Gs
|
| 3 mm |
238.08 kg / 238083 g
2335.6 N
7 861 Gs
|
214.28 kg / 214275 g
2102.0 N
~0 Gs
|
| 5 mm |
221.48 kg / 221477 g
2172.7 N
7 582 Gs
|
199.33 kg / 199329 g
1955.4 N
~0 Gs
|
| 10 mm |
181.86 kg / 181858 g
1784.0 N
6 870 Gs
|
163.67 kg / 163672 g
1605.6 N
~0 Gs
|
| 20 mm |
115.89 kg / 115888 g
1136.9 N
5 484 Gs
|
104.30 kg / 104299 g
1023.2 N
~0 Gs
|
| 50 mm |
24.93 kg / 24933 g
244.6 N
2 544 Gs
|
22.44 kg / 22440 g
220.1 N
~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 |
| 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: Impact energy (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: 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 (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. Shear force
*Warning: On a vertical wall, the magnet holds merely a fraction of its perpendicular strength.
2. Steel thickness impact
*Thin steel (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Power loss vs temp
*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) = 0.54
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Advantages and disadvantages of neodymium magnets.
Benefits
- They virtually do not lose power, because even after ten years the performance loss is only ~1% (based on calculations),
- They do not lose their magnetic properties even under strong external field,
- Thanks to the glossy finish, the surface of Ni-Cu-Ni, gold-plated, or silver gives an modern appearance,
- Magnetic induction on the working part of the magnet remains strong,
- Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
- Considering the option of accurate forming and customization to individualized solutions, neodymium magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
- Versatile presence in future technologies – they are used in magnetic memories, electric motors, diagnostic systems, as well as industrial machines.
- Thanks to their power density, small magnets offer high operating force, occupying minimum space,
Disadvantages
- Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a strong case, which not only protects them against impacts but also increases their durability
- Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
- We suggest casing - magnetic mechanism, due to difficulties in realizing threads inside the magnet and complex shapes.
- Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can disrupt the diagnostic process medical when they are in the body.
- With large orders the cost of neodymium magnets can be a barrier,
Lifting parameters
Best holding force of the magnet in ideal parameters – what affects it?
- on a block made of structural steel, perfectly concentrating the magnetic field
- whose thickness reaches at least 10 mm
- with an ground touching surface
- under conditions of no distance (metal-to-metal)
- for force applied at a right angle (pull-off, not shear)
- in stable room temperature
Practical lifting capacity: influencing factors
- Clearance – existence of any layer (paint, tape, air) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – note that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
- Material composition – different alloys reacts the same. Alloy additives worsen the interaction with the magnet.
- Surface condition – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
- Thermal environment – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.
Lifting capacity was measured using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate lowers the lifting capacity.
Safety rules for work with neodymium magnets
Magnetic interference
GPS units and smartphones are highly susceptible to magnetism. Close proximity with a strong magnet can decalibrate the sensors in your phone.
Do not underestimate power
Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.
Dust is flammable
Combustion risk: Neodymium dust is explosive. Avoid machining magnets in home conditions as this risks ignition.
Thermal limits
Control the heat. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.
Serious injuries
Danger of trauma: The attraction force is so great that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.
Magnets are brittle
Beware of splinters. Magnets can fracture upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Avoid contact if allergic
Medical facts indicate that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, prevent touching magnets with bare hands or choose coated magnets.
Danger to the youngest
Absolutely keep magnets out of reach of children. Ingestion danger is significant, and the consequences of magnets connecting inside the body are fatal.
Health Danger
Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Safe distance
Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (heart implants, medical aids, timepieces).
