MPL 20x5x3 / N38 - lamellar magnet
lamellar magnet
Catalog no 020131
GTIN/EAN: 5906301811374
- length
- 20 mm [±0,1 mm]
- Width
- 5 mm [±0,1 mm]
- Height
- 3 mm [±0,1 mm]
- Weight
- 2.25 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 - MPL 20x5x3 / N38 - lamellar magnet
Specification / characteristics - MPL 20x5x3 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020131 |
| GTIN/EAN | 5906301811374 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 20 mm [±0,1 mm] |
| Width | 5 mm [±0,1 mm] |
| Height | 3 mm [±0,1 mm] |
| Weight | 2.25 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 3.46 kg / 33.93 N |
| Magnetic Induction ~ ? | 358.88 mT / 3589 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 |
Physical modeling of the assembly - data
The following information are the result of a mathematical simulation. Results were calculated on algorithms for the material Nd2Fe14B. Real-world conditions might slightly differ from theoretical values. Use these calculations as a reference point during assembly planning.
Table 1: Static pull force (force vs gap) - characteristics
MPL 20x5x3 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
3585 Gs
358.5 mT
|
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
strong |
| 1 mm |
2619 Gs
261.9 mT
|
1.85 kg / 4.07 lbs
1846.6 g / 18.1 N
|
low risk |
| 2 mm |
1818 Gs
181.8 mT
|
0.89 kg / 1.96 lbs
889.8 g / 8.7 N
|
low risk |
| 3 mm |
1279 Gs
127.9 mT
|
0.44 kg / 0.97 lbs
440.2 g / 4.3 N
|
low risk |
| 5 mm |
696 Gs
69.6 mT
|
0.13 kg / 0.29 lbs
130.6 g / 1.3 N
|
low risk |
| 10 mm |
225 Gs
22.5 mT
|
0.01 kg / 0.03 lbs
13.6 g / 0.1 N
|
low risk |
| 15 mm |
97 Gs
9.7 mT
|
0.00 kg / 0.01 lbs
2.5 g / 0.0 N
|
low risk |
| 20 mm |
49 Gs
4.9 mT
|
0.00 kg / 0.00 lbs
0.6 g / 0.0 N
|
low risk |
| 30 mm |
17 Gs
1.7 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
low risk |
| 50 mm |
4 Gs
0.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
low risk |
Table 2: Shear load (wall)
MPL 20x5x3 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.69 kg / 1.53 lbs
692.0 g / 6.8 N
|
| 1 mm | Stal (~0.2) |
0.37 kg / 0.82 lbs
370.0 g / 3.6 N
|
| 2 mm | Stal (~0.2) |
0.18 kg / 0.39 lbs
178.0 g / 1.7 N
|
| 3 mm | Stal (~0.2) |
0.09 kg / 0.19 lbs
88.0 g / 0.9 N
|
| 5 mm | Stal (~0.2) |
0.03 kg / 0.06 lbs
26.0 g / 0.3 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 15 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
Table 3: Wall mounting (sliding) - behavior on slippery surfaces
MPL 20x5x3 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
1.04 kg / 2.29 lbs
1038.0 g / 10.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.69 kg / 1.53 lbs
692.0 g / 6.8 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.35 kg / 0.76 lbs
346.0 g / 3.4 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.73 kg / 3.81 lbs
1730.0 g / 17.0 N
|
Table 4: Steel thickness (saturation) - power losses
MPL 20x5x3 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.35 kg / 0.76 lbs
346.0 g / 3.4 N
|
| 1 mm |
|
0.87 kg / 1.91 lbs
865.0 g / 8.5 N
|
| 2 mm |
|
1.73 kg / 3.81 lbs
1730.0 g / 17.0 N
|
| 3 mm |
|
2.59 kg / 5.72 lbs
2595.0 g / 25.5 N
|
| 5 mm |
|
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
| 10 mm |
|
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
| 11 mm |
|
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
| 12 mm |
|
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
Table 5: Thermal resistance (material behavior) - thermal limit
MPL 20x5x3 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
3.46 kg / 7.63 lbs
3460.0 g / 33.9 N
|
OK |
| 40 °C | -2.2% |
3.38 kg / 7.46 lbs
3383.9 g / 33.2 N
|
OK |
| 60 °C | -4.4% |
3.31 kg / 7.29 lbs
3307.8 g / 32.4 N
|
|
| 80 °C | -6.6% |
3.23 kg / 7.12 lbs
3231.6 g / 31.7 N
|
|
| 100 °C | -28.8% |
2.46 kg / 5.43 lbs
2463.5 g / 24.2 N
|
Table 6: Magnet-Magnet interaction (attraction) - field collision
MPL 20x5x3 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
7.92 kg / 17.47 lbs
4 860 Gs
|
1.19 kg / 2.62 lbs
1189 g / 11.7 N
|
N/A |
| 1 mm |
5.94 kg / 13.10 lbs
6 209 Gs
|
0.89 kg / 1.97 lbs
891 g / 8.7 N
|
5.35 kg / 11.79 lbs
~0 Gs
|
| 2 mm |
4.23 kg / 9.32 lbs
5 238 Gs
|
0.63 kg / 1.40 lbs
634 g / 6.2 N
|
3.81 kg / 8.39 lbs
~0 Gs
|
| 3 mm |
2.94 kg / 6.49 lbs
4 369 Gs
|
0.44 kg / 0.97 lbs
441 g / 4.3 N
|
2.65 kg / 5.84 lbs
~0 Gs
|
| 5 mm |
1.42 kg / 3.14 lbs
3 039 Gs
|
0.21 kg / 0.47 lbs
213 g / 2.1 N
|
1.28 kg / 2.82 lbs
~0 Gs
|
| 10 mm |
0.30 kg / 0.66 lbs
1 393 Gs
|
0.04 kg / 0.10 lbs
45 g / 0.4 N
|
0.27 kg / 0.59 lbs
~0 Gs
|
| 20 mm |
0.03 kg / 0.07 lbs
450 Gs
|
0.00 kg / 0.01 lbs
5 g / 0.0 N
|
0.03 kg / 0.06 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
56 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 60 mm |
0.00 kg / 0.00 lbs
34 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.00 lbs
23 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 lbs
16 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 lbs
11 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 lbs
8 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Safety (HSE) (electronics) - warnings
MPL 20x5x3 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 5.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.0 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 3.0 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.0 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Impact energy (kinetic energy) - warning
MPL 20x5x3 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
24.51 km/h
(6.81 m/s)
|
0.05 J | |
| 30 mm |
24.60 km/h
(6.83 m/s)
|
0.05 J | |
| 50 mm |
24.60 km/h
(6.83 m/s)
|
0.05 J | |
| 100 mm |
24.61 km/h
(6.84 m/s)
|
0.05 J |
Table 9: Coating parameters (durability)
MPL 20x5x3 / 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 20x5x3 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 3 197 Mx | 32.0 µWb |
| Pc Coefficient | 0.36 | Low (Flat) |
Table 11: Underwater work (magnet fishing)
MPL 20x5x3 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 3.46 kg | Standard |
| Water (riverbed) |
3.96 kg
(+0.50 kg buoyancy gain)
|
+14.5% |
1. Wall mount (shear)
*Warning: On a vertical surface, the magnet holds just approx. 20-30% of its perpendicular strength.
2. Plate thickness effect
*Thin steel (e.g. 0.5mm PC case) significantly limits the holding force.
3. Temperature resistance
*For N38 material, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.36
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
Pros as well as cons of Nd2Fe14B magnets.
Pros
- Their magnetic field is maintained, and after around 10 years it drops only by ~1% (theoretically),
- They maintain their magnetic properties even under strong external field,
- Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver gives an aesthetic appearance,
- They show high magnetic induction at the operating surface, which improves attraction properties,
- 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...
- Thanks to flexibility in designing and the ability to adapt to specific needs,
- Universal use in modern industrial fields – they are used in magnetic memories, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in tiny dimensions, which makes them useful in miniature devices
Weaknesses
- Brittleness is one of their disadvantages. Upon strong impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also raises their durability
- NdFeB magnets lose force when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very resistant to heat
- They oxidize in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- Limited ability of making nuts in the magnet and complicated forms - recommended is a housing - magnetic holder.
- Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these magnets are able to complicate diagnosis medical in case of swallowing.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities
Holding force characteristics
Maximum magnetic pulling force – what contributes to it?
- on a base made of structural steel, optimally conducting the magnetic field
- with a thickness minimum 10 mm
- characterized by even structure
- under conditions of ideal adhesion (metal-to-metal)
- during detachment in a direction vertical to the plane
- at temperature approx. 20 degrees Celsius
Lifting capacity in real conditions – factors
- Distance – the presence of foreign body (paint, tape, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
- Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Steel grade – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
- Surface finish – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, weakening the magnet.
- Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).
Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate decreases the load capacity.
Safety rules for work with NdFeB magnets
Sensitization to coating
Certain individuals have a hypersensitivity to Ni, which is the common plating for neodymium magnets. Frequent touching may cause a rash. We suggest use safety gloves.
Life threat
Patients with a heart stimulator must maintain an large gap from magnets. The magnetic field can interfere with the functioning of the life-saving device.
Electronic hazard
Equipment safety: Strong magnets can damage data carriers and delicate electronics (heart implants, hearing aids, mechanical watches).
Keep away from electronics
GPS units and smartphones are extremely sensitive to magnetism. Direct contact with a powerful NdFeB magnet can permanently damage the sensors in your phone.
Demagnetization risk
Do not overheat. NdFeB magnets are sensitive to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).
Swallowing risk
Only for adults. Small elements pose a choking risk, causing serious injuries. Keep out of reach of children and animals.
Crushing risk
Protect your hands. Two powerful magnets will snap together instantly with a force of massive weight, destroying everything in their path. Be careful!
Dust is flammable
Fire hazard: Rare earth powder is highly flammable. Do not process magnets without safety gear as this may cause fire.
Conscious usage
Before use, read the rules. Sudden snapping can destroy the magnet or hurt your hand. Think ahead.
Beware of splinters
Protect your eyes. Magnets can fracture upon uncontrolled impact, launching sharp fragments into the air. Eye protection is mandatory.
