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
- Coating
- [NiCuNi] Nickel
How we measure these parameters — certificates and measurements
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Need more?Frequently asked questions
How much will a block magnet really hold?
What is the maximum working temperature?
What safety factor should I allow?
Engineering report for this magnet
Full PDF analysis: pull and shear force, effect of distance, temperature and plate thickness, safety distances and the demagnetization curve.
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Detailed specification - 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 | 310 | °C |
| Curie Temperature TF | 590 | °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 modeling of the product - data
Presented data represent the direct effect of a mathematical analysis. Results were calculated on models for the class Nd2Fe14B. Operational parameters might slightly deviate from the simulation results. Use these data as a supplementary guide for designers.
Table 1: Static pull force (pull vs gap) - power drop
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 pounds
12690.0 g / 124.5 N
|
dangerous! |
| 1 mm |
1885 Gs
188.5 mT
|
11.53 kg / 25.42 pounds
11530.3 g / 113.1 N
|
dangerous! |
| 2 mm |
1772 Gs
177.2 mT
|
10.20 kg / 22.49 pounds
10199.9 g / 100.1 N
|
dangerous! |
| 3 mm |
1649 Gs
164.9 mT
|
8.83 kg / 19.47 pounds
8831.3 g / 86.6 N
|
strong |
| 5 mm |
1395 Gs
139.5 mT
|
6.32 kg / 13.93 pounds
6320.3 g / 62.0 N
|
strong |
| 10 mm |
870 Gs
87.0 mT
|
2.46 kg / 5.42 pounds
2459.4 g / 24.1 N
|
strong |
| 15 mm |
549 Gs
54.9 mT
|
0.98 kg / 2.15 pounds
976.9 g / 9.6 N
|
safe |
| 20 mm |
359 Gs
35.9 mT
|
0.42 kg / 0.92 pounds
418.9 g / 4.1 N
|
safe |
| 30 mm |
172 Gs
17.2 mT
|
0.10 kg / 0.21 pounds
95.7 g / 0.9 N
|
safe |
| 50 mm |
54 Gs
5.4 mT
|
0.01 kg / 0.02 pounds
9.5 g / 0.1 N
|
safe |
Table 2: Shear load (wall)
MPL 50x20x5 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
|
| 1 mm | Stal (~0.2) |
2.31 kg / 5.08 pounds
2306.0 g / 22.6 N
|
| 2 mm | Stal (~0.2) |
2.04 kg / 4.50 pounds
2040.0 g / 20.0 N
|
| 3 mm | Stal (~0.2) |
1.77 kg / 3.89 pounds
1766.0 g / 17.3 N
|
| 5 mm | Stal (~0.2) |
1.26 kg / 2.79 pounds
1264.0 g / 12.4 N
|
| 10 mm | Stal (~0.2) |
0.49 kg / 1.08 pounds
492.0 g / 4.8 N
|
| 15 mm | Stal (~0.2) |
0.20 kg / 0.43 pounds
196.0 g / 1.9 N
|
| 20 mm | Stal (~0.2) |
0.08 kg / 0.19 pounds
84.0 g / 0.8 N
|
| 30 mm | Stal (~0.2) |
0.02 kg / 0.04 pounds
20.0 g / 0.2 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
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 pounds
3807.0 g / 37.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
2.54 kg / 5.60 pounds
2538.0 g / 24.9 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
1.27 kg / 2.80 pounds
1269.0 g / 12.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
6.35 kg / 13.99 pounds
6345.0 g / 62.2 N
|
Table 4: Material efficiency (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 pounds
634.5 g / 6.2 N
|
| 1 mm |
|
1.59 kg / 3.50 pounds
1586.3 g / 15.6 N
|
| 2 mm |
|
3.17 kg / 6.99 pounds
3172.5 g / 31.1 N
|
| 3 mm |
|
4.76 kg / 10.49 pounds
4758.8 g / 46.7 N
|
| 5 mm |
|
7.93 kg / 17.49 pounds
7931.2 g / 77.8 N
|
| 10 mm |
|
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
|
| 11 mm |
|
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
|
| 12 mm |
|
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
|
Table 5: Working in heat (material behavior) - resistance threshold
MPL 50x20x5 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
12.69 kg / 27.98 pounds
12690.0 g / 124.5 N
|
OK |
| 40 °C | -2.2% |
12.41 kg / 27.36 pounds
12410.8 g / 121.8 N
|
OK |
| 60 °C | -4.4% |
12.13 kg / 26.75 pounds
12131.6 g / 119.0 N
|
|
| 80 °C | -6.6% |
11.85 kg / 26.13 pounds
11852.5 g / 116.3 N
|
|
| 100 °C | -28.8% |
9.04 kg / 19.92 pounds
9035.3 g / 88.6 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x5 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Strength (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
24.10 kg / 53.12 pounds
3 371 Gs
|
3.61 kg / 7.97 pounds
3614 g / 35.5 N
|
N/A |
| 1 mm |
23.06 kg / 50.84 pounds
3 868 Gs
|
3.46 kg / 7.63 pounds
3459 g / 33.9 N
|
20.75 kg / 45.75 pounds
~0 Gs
|
| 2 mm |
21.89 kg / 48.27 pounds
3 769 Gs
|
3.28 kg / 7.24 pounds
3284 g / 32.2 N
|
19.71 kg / 43.44 pounds
~0 Gs
|
| 3 mm |
20.65 kg / 45.53 pounds
3 661 Gs
|
3.10 kg / 6.83 pounds
3098 g / 30.4 N
|
18.59 kg / 40.98 pounds
~0 Gs
|
| 5 mm |
18.07 kg / 39.83 pounds
3 424 Gs
|
2.71 kg / 5.97 pounds
2710 g / 26.6 N
|
16.26 kg / 35.84 pounds
~0 Gs
|
| 10 mm |
12.00 kg / 26.46 pounds
2 790 Gs
|
1.80 kg / 3.97 pounds
1800 g / 17.7 N
|
10.80 kg / 23.81 pounds
~0 Gs
|
| 20 mm |
4.67 kg / 10.30 pounds
1 741 Gs
|
0.70 kg / 1.54 pounds
701 g / 6.9 N
|
4.20 kg / 9.27 pounds
~0 Gs
|
| 50 mm |
0.37 kg / 0.81 pounds
488 Gs
|
0.06 kg / 0.12 pounds
55 g / 0.5 N
|
0.33 kg / 0.73 pounds
~0 Gs
|
| 60 mm |
0.18 kg / 0.40 pounds
343 Gs
|
0.03 kg / 0.06 pounds
27 g / 0.3 N
|
0.16 kg / 0.36 pounds
~0 Gs
|
| 70 mm |
0.10 kg / 0.21 pounds
248 Gs
|
0.01 kg / 0.03 pounds
14 g / 0.1 N
|
0.09 kg / 0.19 pounds
~0 Gs
|
| 80 mm |
0.05 kg / 0.12 pounds
184 Gs
|
0.01 kg / 0.02 pounds
8 g / 0.1 N
|
0.05 kg / 0.10 pounds
~0 Gs
|
| 90 mm |
0.03 kg / 0.07 pounds
140 Gs
|
0.00 kg / 0.01 pounds
5 g / 0.0 N
|
0.03 kg / 0.06 pounds
~0 Gs
|
| 100 mm |
0.02 kg / 0.04 pounds
108 Gs
|
0.00 kg / 0.01 pounds
3 g / 0.0 N
|
0.02 kg / 0.04 pounds
~0 Gs
|
Table 7: Hazards (electronics) - warnings
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 |
| Car key | 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: Dynamics (kinetic energy) - warning
MPL 50x20x5 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
21.52 km/h
(5.98 m/s)
|
0.67 J | |
| 30 mm |
23.53 km/h
(6.54 m/s)
|
0.80 J | |
| 50 mm |
23.63 km/h
(6.56 m/s)
|
0.81 J | |
| 100 mm |
23.65 km/h
(6.57 m/s)
|
0.81 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: Electrical data (Pc)
MPL 50x20x5 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 20 792 Mx | 207.9 µWb |
| Pc Coefficient | 0.21 | Low (Flat) |
Table 11: Submerged application
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
*Caution: On a vertical wall, the magnet holds just ~20% of its nominal pull.
2. Efficiency vs thickness
*Thin steel (e.g. 0.5mm PC case) significantly reduces the holding force.
3. Thermal stability
*For N38 grade, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.21
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 |
Other products
Advantages and disadvantages of Nd2Fe14B magnets.
Benefits
- They do not lose power, even during nearly 10 years – the decrease in lifting capacity is only ~1% (according to tests),
- Neodymium magnets are distinguished by extremely resistant to demagnetization caused by external interference,
- By covering with a shiny coating of silver, the element gains an elegant look,
- The surface of neodymium magnets generates a intense magnetic field – this is a key feature,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures approaching 230°C and above...
- Due to the option of accurate molding and adaptation to custom needs, neodymium magnets can be manufactured in a broad palette of forms and dimensions, which expands the range of possible applications,
- Significant place in modern technologies – they are commonly used in hard drives, electric drive systems, medical devices, also industrial machines.
- Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,
Disadvantages
- To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 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 resistant to moisture, in case of application outdoors
- We recommend cover - magnetic mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
- Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that small elements of these magnets are able to be problematic in diagnostics medical in case of swallowing.
- With mass production the cost of neodymium magnets can be a barrier,
Lifting parameters
Breakaway strength of the magnet in ideal conditions – what it depends on?
- with the application of a sheet made of special test steel, ensuring maximum field concentration
- possessing a thickness of min. 10 mm to avoid saturation
- with an ideally smooth touching surface
- without the slightest air gap between the magnet and steel
- under perpendicular application of breakaway force (90-degree angle)
- at standard ambient temperature
Determinants of lifting force in real conditions
- Gap between magnet and steel – every millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
- Pull-off angle – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
- Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Cast iron may attract less.
- Base smoothness – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Roughness creates an air distance.
- Temperature – heating the magnet results in weakening of force. Check the thermal limit for a given model.
Lifting capacity was measured by applying a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet and the plate lowers the lifting capacity.
H&S for magnets
Electronic devices
Equipment safety: Neodymium magnets can ruin data carriers and sensitive devices (heart implants, hearing aids, timepieces).
Do not underestimate power
Handle magnets consciously. Their huge power can surprise even experienced users. Plan your moves and respect their force.
Machining danger
Combustion risk: Neodymium dust is highly flammable. Do not process magnets in home conditions as this may cause fire.
Danger to the youngest
Adult use only. Small elements pose a choking risk, causing serious injuries. Keep out of reach of kids and pets.
Maximum temperature
Control the heat. Exposing the magnet to high heat will permanently weaken its properties and pulling force.
Impact on smartphones
A powerful magnetic field negatively affects the functioning of magnetometers in phones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.
Sensitization to coating
It is widely known that the nickel plating (standard magnet coating) is a strong allergen. For allergy sufferers, prevent touching magnets with bare hands and select coated magnets.
Risk of cracking
Despite metallic appearance, neodymium is brittle and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
Finger safety
Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying everything in their path. Exercise extreme caution!
Life threat
Individuals with a pacemaker must keep an absolute distance from magnets. The magnetic field can stop the functioning of the implant.
