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
- 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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Technical of the product - 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 |
|---|---|---|
| Remanence Br ? | 12.2-12.6 | kGs |
| Remanence Br ? | 1220-1260 | mT |
| Coercivity bHc ? | 10.8-11.5 | kOe |
| Coercivity bHc ? | 860-915 | kA/m |
| Intrinsic coercivity iHc | ≥ 12 | kOe |
| Intrinsic coercivity iHc | ≥ 955 | kA/m |
| Energy product BHmax ? | 36-38 | BH max MGOe |
| Energy product BHmax ? | 287-303 | BH max KJ/m |
| Maximum working 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 simulation of the product - technical parameters
Presented data constitute the outcome of a engineering calculation. Values rely on algorithms for the material Nd2Fe14B. Operational parameters might slightly differ from theoretical values. Use these calculations as a supplementary guide during assembly planning.
Table 1: Static pull force (pull 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 pounds
29990.0 g / 294.2 N
|
crushing |
| 1 mm |
3158 Gs
315.8 mT
|
26.32 kg / 58.03 pounds
26323.3 g / 258.2 N
|
crushing |
| 2 mm |
2932 Gs
293.2 mT
|
22.69 kg / 50.02 pounds
22687.6 g / 222.6 N
|
crushing |
| 3 mm |
2703 Gs
270.3 mT
|
19.29 kg / 42.52 pounds
19286.7 g / 189.2 N
|
crushing |
| 5 mm |
2266 Gs
226.6 mT
|
13.55 kg / 29.86 pounds
13546.3 g / 132.9 N
|
crushing |
| 10 mm |
1419 Gs
141.9 mT
|
5.31 kg / 11.71 pounds
5313.0 g / 52.1 N
|
warning |
| 15 mm |
908 Gs
90.8 mT
|
2.17 kg / 4.79 pounds
2174.5 g / 21.3 N
|
warning |
| 20 mm |
603 Gs
60.3 mT
|
0.96 kg / 2.12 pounds
961.0 g / 9.4 N
|
safe |
| 30 mm |
296 Gs
29.6 mT
|
0.23 kg / 0.51 pounds
231.0 g / 2.3 N
|
safe |
| 50 mm |
97 Gs
9.7 mT
|
0.02 kg / 0.05 pounds
24.8 g / 0.2 N
|
safe |
Table 2: Shear load (wall)
MPL 50x20x10 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
|
| 1 mm | Stal (~0.2) |
5.26 kg / 11.61 pounds
5264.0 g / 51.6 N
|
| 2 mm | Stal (~0.2) |
4.54 kg / 10.00 pounds
4538.0 g / 44.5 N
|
| 3 mm | Stal (~0.2) |
3.86 kg / 8.51 pounds
3858.0 g / 37.8 N
|
| 5 mm | Stal (~0.2) |
2.71 kg / 5.97 pounds
2710.0 g / 26.6 N
|
| 10 mm | Stal (~0.2) |
1.06 kg / 2.34 pounds
1062.0 g / 10.4 N
|
| 15 mm | Stal (~0.2) |
0.43 kg / 0.96 pounds
434.0 g / 4.3 N
|
| 20 mm | Stal (~0.2) |
0.19 kg / 0.42 pounds
192.0 g / 1.9 N
|
| 30 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
Table 3: Wall mounting (shearing) - behavior on slippery surfaces
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 pounds
8997.0 g / 88.3 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
6.00 kg / 13.22 pounds
5998.0 g / 58.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
3.00 kg / 6.61 pounds
2999.0 g / 29.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
15.00 kg / 33.06 pounds
14995.0 g / 147.1 N
|
Table 4: Material efficiency (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 pounds
1499.5 g / 14.7 N
|
| 1 mm |
|
3.75 kg / 8.26 pounds
3748.8 g / 36.8 N
|
| 2 mm |
|
7.50 kg / 16.53 pounds
7497.5 g / 73.6 N
|
| 3 mm |
|
11.25 kg / 24.79 pounds
11246.3 g / 110.3 N
|
| 5 mm |
|
18.74 kg / 41.32 pounds
18743.8 g / 183.9 N
|
| 10 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
| 11 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
| 12 mm |
|
29.99 kg / 66.12 pounds
29990.0 g / 294.2 N
|
Table 5: Working in heat (material behavior) - 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 pounds
29990.0 g / 294.2 N
|
OK |
| 40 °C | -2.2% |
29.33 kg / 64.66 pounds
29330.2 g / 287.7 N
|
OK |
| 60 °C | -4.4% |
28.67 kg / 63.21 pounds
28670.4 g / 281.3 N
|
|
| 80 °C | -6.6% |
28.01 kg / 61.75 pounds
28010.7 g / 274.8 N
|
|
| 100 °C | -28.8% |
21.35 kg / 47.07 pounds
21352.9 g / 209.5 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 50x20x10 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
70.06 kg / 154.45 pounds
4 789 Gs
|
10.51 kg / 23.17 pounds
10509 g / 103.1 N
|
N/A |
| 1 mm |
65.83 kg / 145.13 pounds
6 535 Gs
|
9.87 kg / 21.77 pounds
9874 g / 96.9 N
|
59.25 kg / 130.61 pounds
~0 Gs
|
| 2 mm |
61.49 kg / 135.57 pounds
6 316 Gs
|
9.22 kg / 20.34 pounds
9224 g / 90.5 N
|
55.34 kg / 122.01 pounds
~0 Gs
|
| 3 mm |
57.20 kg / 126.10 pounds
6 092 Gs
|
8.58 kg / 18.92 pounds
8580 g / 84.2 N
|
51.48 kg / 113.49 pounds
~0 Gs
|
| 5 mm |
48.94 kg / 107.89 pounds
5 635 Gs
|
7.34 kg / 16.18 pounds
7341 g / 72.0 N
|
44.05 kg / 97.10 pounds
~0 Gs
|
| 10 mm |
31.64 kg / 69.76 pounds
4 531 Gs
|
4.75 kg / 10.46 pounds
4747 g / 46.6 N
|
28.48 kg / 62.79 pounds
~0 Gs
|
| 20 mm |
12.41 kg / 27.36 pounds
2 838 Gs
|
1.86 kg / 4.10 pounds
1862 g / 18.3 N
|
11.17 kg / 24.63 pounds
~0 Gs
|
| 50 mm |
1.07 kg / 2.35 pounds
832 Gs
|
0.16 kg / 0.35 pounds
160 g / 1.6 N
|
0.96 kg / 2.12 pounds
~0 Gs
|
| 60 mm |
0.54 kg / 1.19 pounds
592 Gs
|
0.08 kg / 0.18 pounds
81 g / 0.8 N
|
0.49 kg / 1.07 pounds
~0 Gs
|
| 70 mm |
0.29 kg / 0.64 pounds
433 Gs
|
0.04 kg / 0.10 pounds
43 g / 0.4 N
|
0.26 kg / 0.57 pounds
~0 Gs
|
| 80 mm |
0.16 kg / 0.36 pounds
324 Gs
|
0.02 kg / 0.05 pounds
24 g / 0.2 N
|
0.15 kg / 0.32 pounds
~0 Gs
|
| 90 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
|
| 100 mm |
0.06 kg / 0.13 pounds
194 Gs
|
0.01 kg / 0.02 pounds
9 g / 0.1 N
|
0.05 kg / 0.11 pounds
~0 Gs
|
Table 7: Hazards (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 |
| Mechanical watch | 20 Gs (2.0 mT) | 9.5 cm |
| Phone / Smartphone | 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 |
22.58 km/h
(6.27 m/s)
|
1.47 J | |
| 30 mm |
24.72 km/h
(6.87 m/s)
|
1.77 J | |
| 50 mm |
24.83 km/h
(6.90 m/s)
|
1.78 J | |
| 100 mm |
24.86 km/h
(6.90 m/s)
|
1.79 J |
Table 9: Corrosion resistance
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: Electrical 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: Hydrostatics and buoyancy
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. Wall mount (shear)
*Caution: On a vertical wall, the magnet retains just ~20% of its max power.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) significantly reduces the holding force.
3. Power loss vs temp
*For N38 material, the safety limit is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.38
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.
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% |
Sustainability
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros and cons of rare earth magnets.
Strengths
- Their magnetic field is durable, and after approximately 10 years it decreases only by ~1% (theoretically),
- They are noted for resistance to demagnetization induced by external disturbances,
- The use of an refined coating of noble metals (nickel, gold, silver) causes the element to look better,
- Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
- Due to the potential of precise forming and adaptation to specialized needs, neodymium magnets can be manufactured in a wide range of geometric configurations, which expands the range of possible applications,
- Fundamental importance in electronics industry – they are commonly used in data components, electric drive systems, medical devices, and modern systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Cons
- Brittleness is one of their disadvantages. Upon strong impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also increases their durability
- We warn that neodymium magnets can reduce their strength 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 stable to moisture, when using outdoors
- Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic mechanism.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these products are able to disrupt the diagnostic process medical after entering the body.
- With large orders the cost of neodymium magnets is a challenge,
Holding force characteristics
Breakaway strength of the magnet in ideal conditions – what affects it?
- using a sheet made of mild steel, functioning as a magnetic yoke
- possessing a massiveness of minimum 10 mm to avoid saturation
- with a plane free of scratches
- under conditions of gap-free contact (surface-to-surface)
- for force acting at a right angle (pull-off, not shear)
- at standard ambient temperature
Lifting capacity in practice – influencing factors
- Air gap (between the magnet and the plate), since even a tiny clearance (e.g. 0.5 mm) results in a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
- Force direction – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
- Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
- Steel grade – ideal substrate is pure iron steel. Cast iron may have worse magnetic properties.
- Surface finish – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
- Temperature influence – hot environment weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.
Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a minimal clearance between the magnet and the plate decreases the lifting capacity.
Precautions when working with neodymium magnets
Handling guide
Before starting, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Be predictive.
Magnet fragility
Watch out for shards. Magnets can fracture upon violent connection, launching sharp fragments into the air. Wear goggles.
Nickel allergy
Nickel alert: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease handling magnets and wear gloves.
Cards and drives
Do not bring magnets close to a purse, laptop, or screen. The magnetic field can destroy these devices and wipe information from cards.
Dust is flammable
Machining of neodymium magnets carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Magnetic interference
An intense magnetic field negatively affects the functioning of magnetometers in phones and GPS navigation. Keep magnets close to a device to avoid breaking the sensors.
Power loss in heat
Watch the temperature. Exposing the magnet to high heat will destroy its magnetic structure and strength.
Physical harm
Large magnets can smash fingers in a fraction of a second. Never place your hand betwixt two strong magnets.
Product not for children
Always store magnets out of reach of children. Risk of swallowing is high, and the consequences of magnets clamping inside the body are tragic.
Implant safety
Medical warning: Strong magnets can turn off heart devices and defibrillators. Do not approach if you have medical devices.
