MPL 50x20x10 / N38 - lamellar magnet
lamellar magnet
Catalog no 020165
GTIN/EAN: 5906301811718
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
10 mm [±0,1 mm]
Weight
75 g
Magnetization Direction
↑ axial
Load capacity
29.99 kg / 294.15 N
Magnetic Induction
337.18 mT / 3372 Gs
Coating
[NiCuNi] Nickel
43.05 ZŁ with VAT / pcs + price for transport
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Technical - MPL 50x20x10 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x10 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020165 |
| GTIN/EAN | 5906301811718 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 50 mm [±0,1 mm] |
| Width | 20 mm [±0,1 mm] |
| Height | 10 mm [±0,1 mm] |
| Weight | 75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 29.99 kg / 294.15 N |
| Magnetic Induction ~ ? | 337.18 mT / 3372 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 analysis of the assembly - data
The following values represent the outcome of a physical analysis. Values rely on models for the class Nd2Fe14B. Actual conditions may differ from theoretical values. Please consider these data as a supplementary guide during assembly planning.
Table 1: Static pull force (force vs gap) - power drop
MPL 50x20x10 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3371 Gs
337.1 mT
|
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
|
crushing |
| 1 mm |
3158 Gs
315.8 mT
|
26.32 kg / 58.03 LBS
26323.3 g / 258.2 N
|
crushing |
| 2 mm |
2932 Gs
293.2 mT
|
22.69 kg / 50.02 LBS
22687.6 g / 222.6 N
|
crushing |
| 3 mm |
2703 Gs
270.3 mT
|
19.29 kg / 42.52 LBS
19286.7 g / 189.2 N
|
crushing |
| 5 mm |
2266 Gs
226.6 mT
|
13.55 kg / 29.86 LBS
13546.3 g / 132.9 N
|
crushing |
| 10 mm |
1419 Gs
141.9 mT
|
5.31 kg / 11.71 LBS
5313.0 g / 52.1 N
|
warning |
| 15 mm |
908 Gs
90.8 mT
|
2.17 kg / 4.79 LBS
2174.5 g / 21.3 N
|
warning |
| 20 mm |
603 Gs
60.3 mT
|
0.96 kg / 2.12 LBS
961.0 g / 9.4 N
|
safe |
| 30 mm |
296 Gs
29.6 mT
|
0.23 kg / 0.51 LBS
231.0 g / 2.3 N
|
safe |
| 50 mm |
97 Gs
9.7 mT
|
0.02 kg / 0.05 LBS
24.8 g / 0.2 N
|
safe |
Table 2: Slippage force (vertical surface)
MPL 50x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
|
| 1 mm | Stal (~0.2) |
5.26 kg / 11.61 LBS
5264.0 g / 51.6 N
|
| 2 mm | Stal (~0.2) |
4.54 kg / 10.00 LBS
4538.0 g / 44.5 N
|
| 3 mm | Stal (~0.2) |
3.86 kg / 8.51 LBS
3858.0 g / 37.8 N
|
| 5 mm | Stal (~0.2) |
2.71 kg / 5.97 LBS
2710.0 g / 26.6 N
|
| 10 mm | Stal (~0.2) |
1.06 kg / 2.34 LBS
1062.0 g / 10.4 N
|
| 15 mm | Stal (~0.2) |
0.43 kg / 0.96 LBS
434.0 g / 4.3 N
|
| 20 mm | Stal (~0.2) |
0.19 kg / 0.42 LBS
192.0 g / 1.9 N
|
| 30 mm | Stal (~0.2) |
0.05 kg / 0.10 LBS
46.0 g / 0.5 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 LBS
4.0 g / 0.0 N
|
Table 3: Vertical assembly (shearing) - vertical pull
MPL 50x20x10 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
9.00 kg / 19.83 LBS
8997.0 g / 88.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
6.00 kg / 13.22 LBS
5998.0 g / 58.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.00 kg / 6.61 LBS
2999.0 g / 29.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
15.00 kg / 33.06 LBS
14995.0 g / 147.1 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 50x20x10 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
1.50 kg / 3.31 LBS
1499.5 g / 14.7 N
|
| 1 mm |
|
3.75 kg / 8.26 LBS
3748.8 g / 36.8 N
|
| 2 mm |
|
7.50 kg / 16.53 LBS
7497.5 g / 73.6 N
|
| 3 mm |
|
11.25 kg / 24.79 LBS
11246.3 g / 110.3 N
|
| 5 mm |
|
18.74 kg / 41.32 LBS
18743.8 g / 183.9 N
|
| 10 mm |
|
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
|
| 11 mm |
|
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
|
| 12 mm |
|
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
|
Table 5: Thermal resistance (stability) - resistance threshold
MPL 50x20x10 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
29.99 kg / 66.12 LBS
29990.0 g / 294.2 N
|
OK |
| 40 °C | -2.2% |
29.33 kg / 64.66 LBS
29330.2 g / 287.7 N
|
OK |
| 60 °C | -4.4% |
28.67 kg / 63.21 LBS
28670.4 g / 281.3 N
|
|
| 80 °C | -6.6% |
28.01 kg / 61.75 LBS
28010.7 g / 274.8 N
|
|
| 100 °C | -28.8% |
21.35 kg / 47.07 LBS
21352.9 g / 209.5 N
|
Table 6: Two magnets (attraction) - field collision
MPL 50x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
70.06 kg / 154.45 LBS
4 789 Gs
|
10.51 kg / 23.17 LBS
10509 g / 103.1 N
|
N/A |
| 1 mm |
65.83 kg / 145.13 LBS
6 535 Gs
|
9.87 kg / 21.77 LBS
9874 g / 96.9 N
|
59.25 kg / 130.61 LBS
~0 Gs
|
| 2 mm |
61.49 kg / 135.57 LBS
6 316 Gs
|
9.22 kg / 20.34 LBS
9224 g / 90.5 N
|
55.34 kg / 122.01 LBS
~0 Gs
|
| 3 mm |
57.20 kg / 126.10 LBS
6 092 Gs
|
8.58 kg / 18.92 LBS
8580 g / 84.2 N
|
51.48 kg / 113.49 LBS
~0 Gs
|
| 5 mm |
48.94 kg / 107.89 LBS
5 635 Gs
|
7.34 kg / 16.18 LBS
7341 g / 72.0 N
|
44.05 kg / 97.10 LBS
~0 Gs
|
| 10 mm |
31.64 kg / 69.76 LBS
4 531 Gs
|
4.75 kg / 10.46 LBS
4747 g / 46.6 N
|
28.48 kg / 62.79 LBS
~0 Gs
|
| 20 mm |
12.41 kg / 27.36 LBS
2 838 Gs
|
1.86 kg / 4.10 LBS
1862 g / 18.3 N
|
11.17 kg / 24.63 LBS
~0 Gs
|
| 50 mm |
1.07 kg / 2.35 LBS
832 Gs
|
0.16 kg / 0.35 LBS
160 g / 1.6 N
|
0.96 kg / 2.12 LBS
~0 Gs
|
| 60 mm |
0.54 kg / 1.19 LBS
592 Gs
|
0.08 kg / 0.18 LBS
81 g / 0.8 N
|
0.49 kg / 1.07 LBS
~0 Gs
|
| 70 mm |
0.29 kg / 0.64 LBS
433 Gs
|
0.04 kg / 0.10 LBS
43 g / 0.4 N
|
0.26 kg / 0.57 LBS
~0 Gs
|
| 80 mm |
0.16 kg / 0.36 LBS
324 Gs
|
0.02 kg / 0.05 LBS
24 g / 0.2 N
|
0.15 kg / 0.32 LBS
~0 Gs
|
| 90 mm |
0.10 kg / 0.21 LBS
248 Gs
|
0.01 kg / 0.03 LBS
14 g / 0.1 N
|
0.09 kg / 0.19 LBS
~0 Gs
|
| 100 mm |
0.06 kg / 0.13 LBS
194 Gs
|
0.01 kg / 0.02 LBS
9 g / 0.1 N
|
0.05 kg / 0.11 LBS
~0 Gs
|
Table 7: Protective zones (implants) - precautionary measures
MPL 50x20x10 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 15.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 12.0 cm |
| Timepiece | 20 Gs (2.0 mT) | 9.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 7.5 cm |
| Remote | 50 Gs (5.0 mT) | 7.0 cm |
| Payment card | 400 Gs (40.0 mT) | 3.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 2.5 cm |
Table 8: Collisions (cracking risk) - collision effects
MPL 50x20x10 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
22.29 km/h
(6.19 m/s)
|
1.44 J | |
| 30 mm |
35.10 km/h
(9.75 m/s)
|
3.56 J | |
| 50 mm |
45.12 km/h
(12.53 m/s)
|
5.89 J | |
| 100 mm |
63.77 km/h
(17.72 m/s)
|
11.77 J |
Table 9: Coating parameters (durability)
MPL 50x20x10 / 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 50x20x10 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 32 980 Mx | 329.8 µWb |
| Pc Coefficient | 0.38 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 50x20x10 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 29.99 kg | Standard |
| Water (riverbed) |
34.34 kg
(+4.35 kg buoyancy gain)
|
+14.5% |
1. Vertical hold
*Warning: On a vertical wall, the magnet holds only approx. 20-30% of its nominal pull.
2. Steel saturation
*Thin metal sheet (e.g. 0.5mm PC case) significantly weakens the holding force.
3. Power loss vs temp
*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) = 0.38
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
Other proposals
Pros and cons of neodymium magnets.
Pros
- Their strength is durable, and after approximately 10 years it drops only by ~1% (theoretically),
- They maintain their magnetic properties even under strong external field,
- In other words, due to the reflective layer of gold, the element looks attractive,
- Magnets exhibit excellent magnetic induction on the working surface,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures reaching 230°C and above...
- Possibility of accurate modeling as well as adapting to specific applications,
- Significant place in modern technologies – they are utilized in magnetic memories, brushless drives, advanced medical instruments, as well as complex engineering applications.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Cons
- To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
- We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnet mounting.
- Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that small elements of these magnets are able to complicate diagnosis medical after entering the body.
- With large orders the cost of neodymium magnets can be a barrier,
Holding force characteristics
Best holding force of the magnet in ideal parameters – what it depends on?
- on a block made of mild steel, optimally conducting the magnetic field
- with a cross-section of at least 10 mm
- with a plane perfectly flat
- with direct contact (without paint)
- for force acting at a right angle (in the magnet axis)
- in temp. approx. 20°C
Lifting capacity in practice – influencing factors
- Distance – existence of any layer (paint, dirt, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
- Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
- Chemical composition of the base – mild steel gives the best results. Alloy admixtures decrease magnetic permeability and lifting capacity.
- Surface condition – ground elements guarantee perfect abutment, which improves force. Uneven metal reduce efficiency.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the thermal limit for a given model.
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the load capacity is reduced by as much as 5 times. Additionally, even a slight gap between the magnet’s surface and the plate decreases the load capacity.
Warnings
Hand protection
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Use thick gloves.
Caution required
Be careful. Neodymium magnets attract from a distance and snap with huge force, often quicker than you can move away.
Risk of cracking
Beware of splinters. Magnets can explode upon violent connection, launching sharp fragments into the air. Eye protection is mandatory.
Maximum temperature
Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.
Medical implants
Patients with a heart stimulator must keep an large gap from magnets. The magnetism can disrupt the operation of the life-saving device.
Threat to electronics
Data protection: Neodymium magnets can damage payment cards and delicate electronics (heart implants, hearing aids, timepieces).
Avoid contact if allergic
It is widely known that the nickel plating (the usual finish) is a potent allergen. For allergy sufferers, prevent touching magnets with bare hands or choose versions in plastic housing.
Keep away from children
Neodymium magnets are not intended for children. Eating multiple magnets can lead to them attracting across intestines, which constitutes a severe health hazard and requires urgent medical intervention.
Keep away from electronics
A strong magnetic field negatively affects the functioning of compasses in phones and GPS navigation. Do not bring magnets close to a device to prevent damaging the sensors.
Machining danger
Dust produced during machining of magnets is self-igniting. Avoid drilling into magnets without proper cooling and knowledge.
