MPL 50x20x5 / N38 - lamellar magnet
lamellar magnet
Catalog no 020473
GTIN/EAN: 5906301811930
length
50 mm [±0,1 mm]
Width
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
37.5 g
Magnetization Direction
↑ axial
Load capacity
12.69 kg / 124.48 N
Magnetic Induction
197.73 mT / 1977 Gs
Coating
[NiCuNi] Nickel
14.56 ZŁ with VAT / pcs + price for transport
11.84 ZŁ net + 23% VAT / pcs
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Technical data of the product - MPL 50x20x5 / N38 - lamellar magnet
Specification / characteristics - MPL 50x20x5 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020473 |
| GTIN/EAN | 5906301811930 |
| 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 | 5 mm [±0,1 mm] |
| Weight | 37.5 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 12.69 kg / 124.48 N |
| Magnetic Induction ~ ? | 197.73 mT / 1977 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 - technical parameters
These information are the result of a mathematical analysis. Results are based on models for the class Nd2Fe14B. Operational performance might slightly differ. Use these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs distance) - interaction chart
MPL 50x20x5 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1977 Gs
197.7 mT
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
dangerous! |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 LBS
11530.3 g / 113.1 N
|
dangerous! |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 LBS
10199.9 g / 100.1 N
|
dangerous! |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 LBS
8831.3 g / 86.6 N
|
medium risk |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 LBS
6320.3 g / 62.0 N
|
medium risk |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 LBS
2459.4 g / 24.1 N
|
medium risk |
| 15 mm |
549 Gs
54.9 mT
|
0.98 kg / 2.15 LBS
976.9 g / 9.6 N
|
low risk |
| 20 mm |
359 Gs
35.9 mT
|
0.42 kg / 0.92 LBS
418.9 g / 4.1 N
|
low risk |
| 30 mm |
172 Gs
17.2 mT
|
0.10 kg / 0.21 LBS
95.7 g / 0.9 N
|
low risk |
| 50 mm |
54 Gs
5.4 mT
|
0.01 kg / 0.02 LBS
9.5 g / 0.1 N
|
low risk |
Table 2: Shear hold (wall)
MPL 50x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
|
| 1 mm | Stal (~0.2) |
2.31 kg / 5.08 LBS
2306.0 g / 22.6 N
|
| 2 mm | Stal (~0.2) |
2.04 kg / 4.50 LBS
2040.0 g / 20.0 N
|
| 3 mm | Stal (~0.2) |
1.77 kg / 3.89 LBS
1766.0 g / 17.3 N
|
| 5 mm | Stal (~0.2) |
1.26 kg / 2.79 LBS
1264.0 g / 12.4 N
|
| 10 mm | Stal (~0.2) |
0.49 kg / 1.08 LBS
492.0 g / 4.8 N
|
| 15 mm | Stal (~0.2) |
0.20 kg / 0.43 LBS
196.0 g / 1.9 N
|
| 20 mm | Stal (~0.2) |
0.08 kg / 0.19 LBS
84.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 LBS
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 LBS
2.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - vertical pull
MPL 50x20x5 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
3.81 kg / 8.39 LBS
3807.0 g / 37.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.54 kg / 5.60 LBS
2538.0 g / 24.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.27 kg / 2.80 LBS
1269.0 g / 12.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
6.35 kg / 13.99 LBS
6345.0 g / 62.2 N
|
Table 4: Steel thickness (substrate influence) - power losses
MPL 50x20x5 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.63 kg / 1.40 LBS
634.5 g / 6.2 N
|
| 1 mm |
|
1.59 kg / 3.50 LBS
1586.3 g / 15.6 N
|
| 2 mm |
|
3.17 kg / 6.99 LBS
3172.5 g / 31.1 N
|
| 3 mm |
|
4.76 kg / 10.49 LBS
4758.8 g / 46.7 N
|
| 5 mm |
|
7.93 kg / 17.49 LBS
7931.2 g / 77.8 N
|
| 10 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
| 11 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
| 12 mm |
|
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
Table 5: Thermal stability (stability) - thermal limit
MPL 50x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
12.69 kg / 27.98 LBS
12690.0 g / 124.5 N
|
OK |
| 40 °C | -2.2% |
12.41 kg / 27.36 LBS
12410.8 g / 121.8 N
|
OK |
| 60 °C | -4.4% |
12.13 kg / 26.75 LBS
12131.6 g / 119.0 N
|
|
| 80 °C | -6.6% |
11.85 kg / 26.13 LBS
11852.5 g / 116.3 N
|
|
| 100 °C | -28.8% |
9.04 kg / 19.92 LBS
9035.3 g / 88.6 N
|
Table 6: Two magnets (repulsion) - field collision
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
24.10 kg / 53.12 LBS
3 371 Gs
|
3.61 kg / 7.97 LBS
3614 g / 35.5 N
|
N/A |
| 1 mm |
23.06 kg / 50.84 LBS
3 868 Gs
|
3.46 kg / 7.63 LBS
3459 g / 33.9 N
|
20.75 kg / 45.75 LBS
~0 Gs
|
| 2 mm |
21.89 kg / 48.27 LBS
3 769 Gs
|
3.28 kg / 7.24 LBS
3284 g / 32.2 N
|
19.71 kg / 43.44 LBS
~0 Gs
|
| 3 mm |
20.65 kg / 45.53 LBS
3 661 Gs
|
3.10 kg / 6.83 LBS
3098 g / 30.4 N
|
18.59 kg / 40.98 LBS
~0 Gs
|
| 5 mm |
18.07 kg / 39.83 LBS
3 424 Gs
|
2.71 kg / 5.97 LBS
2710 g / 26.6 N
|
16.26 kg / 35.84 LBS
~0 Gs
|
| 10 mm |
12.00 kg / 26.46 LBS
2 790 Gs
|
1.80 kg / 3.97 LBS
1800 g / 17.7 N
|
10.80 kg / 23.81 LBS
~0 Gs
|
| 20 mm |
4.67 kg / 10.30 LBS
1 741 Gs
|
0.70 kg / 1.54 LBS
701 g / 6.9 N
|
4.20 kg / 9.27 LBS
~0 Gs
|
| 50 mm |
0.37 kg / 0.81 LBS
488 Gs
|
0.06 kg / 0.12 LBS
55 g / 0.5 N
|
0.33 kg / 0.73 LBS
~0 Gs
|
| 60 mm |
0.18 kg / 0.40 LBS
343 Gs
|
0.03 kg / 0.06 LBS
27 g / 0.3 N
|
0.16 kg / 0.36 LBS
~0 Gs
|
| 70 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
|
| 80 mm |
0.05 kg / 0.12 LBS
184 Gs
|
0.01 kg / 0.02 LBS
8 g / 0.1 N
|
0.05 kg / 0.10 LBS
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 LBS
140 Gs
|
0.00 kg / 0.01 LBS
5 g / 0.0 N
|
0.03 kg / 0.06 LBS
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 LBS
108 Gs
|
0.00 kg / 0.01 LBS
3 g / 0.0 N
|
0.02 kg / 0.04 LBS
~0 Gs
|
Table 7: Protective zones (electronics) - precautionary measures
MPL 50x20x5 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 12.5 cm |
| Hearing aid | 10 Gs (1.0 mT) | 9.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 7.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 6.0 cm |
| Remote | 50 Gs (5.0 mT) | 5.5 cm |
| Payment card | 400 Gs (40.0 mT) | 2.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.5 cm |
Table 8: Impact energy (cracking risk) - warning
MPL 50x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
20.68 km/h
(5.74 m/s)
|
0.62 J | |
| 30 mm |
32.28 km/h
(8.97 m/s)
|
1.51 J | |
| 50 mm |
41.50 km/h
(11.53 m/s)
|
2.49 J | |
| 100 mm |
58.67 km/h
(16.30 m/s)
|
4.98 J |
Table 9: Surface protection spec
MPL 50x20x5 / 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 50x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 20 792 Mx | 207.9 µWb |
| Pc Coefficient | 0.21 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 50x20x5 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 12.69 kg | Standard |
| Water (riverbed) |
14.53 kg
(+1.84 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Note: On a vertical surface, the magnet retains only approx. 20-30% of its max power.
2. Steel saturation
*Thin metal sheet (e.g. computer case) severely limits the holding force.
3. Heat tolerance
*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) = 0.21
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
Strengths as well as weaknesses of neodymium magnets.
Strengths
- They do not lose power, even during around 10 years – the drop in strength is only ~1% (based on measurements),
- They are resistant to demagnetization induced by external magnetic fields,
- A magnet with a smooth silver surface has an effective appearance,
- Neodymium magnets ensure maximum magnetic induction on a small surface, which increases force concentration,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for action at temperatures reaching 230°C and above...
- Thanks to modularity in forming and the capacity to customize to unusual requirements,
- Versatile presence in high-tech industry – they serve a role in data components, drive modules, medical devices, and other advanced devices.
- Compactness – despite small sizes they provide effective action, making them ideal for precision applications
Disadvantages
- At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets decrease their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
- We suggest a housing - magnetic mechanism, due to difficulties in creating threads inside the magnet and complicated forms.
- Potential hazard resulting from small fragments of magnets can be dangerous, if swallowed, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Lifting parameters
Best holding force of the magnet in ideal parameters – what it depends on?
- using a base made of mild steel, serving as a circuit closing element
- possessing a thickness of minimum 10 mm to ensure full flux closure
- with an ground touching surface
- without any air gap between the magnet and steel
- during pulling in a direction vertical to the plane
- at standard ambient temperature
Determinants of practical lifting force of a magnet
- Gap (between the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
- Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
- Plate thickness – too thin steel does not accept the full field, causing part of the power to be escaped into the air.
- Steel type – mild steel gives the best results. Alloy admixtures decrease magnetic properties and holding force.
- Smoothness – full contact is possible only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).
Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under perpendicular forces, however under shearing force the holding force is lower. Moreover, even a small distance between the magnet’s surface and the plate decreases the load capacity.
Safe handling of NdFeB magnets
Implant safety
Life threat: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.
Physical harm
Big blocks can break fingers instantly. Under no circumstances place your hand betwixt two strong magnets.
Powerful field
Use magnets with awareness. Their immense force can shock even professionals. Be vigilant and do not underestimate their power.
Metal Allergy
Medical facts indicate that the nickel plating (the usual finish) is a potent allergen. If your skin reacts to metals, avoid direct skin contact or choose coated magnets.
Phone sensors
A strong magnetic field negatively affects the operation of compasses in smartphones and navigation systems. Do not bring magnets near a device to prevent breaking the sensors.
Danger to the youngest
Only for adults. Tiny parts pose a choking risk, causing severe trauma. Store away from kids and pets.
Threat to electronics
Data protection: Neodymium magnets can ruin payment cards and delicate electronics (pacemakers, medical aids, timepieces).
Beware of splinters
NdFeB magnets are sintered ceramics, which means they are fragile like glass. Impact of two magnets will cause them shattering into shards.
Do not overheat magnets
Regular neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. Damage is permanent.
Combustion hazard
Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.
