MPL 30x15x2 / N38 - lamellar magnet
lamellar magnet
Catalog no 020140
GTIN/EAN: 5906301811466
- length
- 30 mm [±0,1 mm]
- Width
- 15 mm [±0,1 mm]
- Height
- 2 mm [±0,1 mm]
- Weight
- 6.75 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 - MPL 30x15x2 / N38 - lamellar magnet
Specification / characteristics - MPL 30x15x2 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020140 |
| GTIN/EAN | 5906301811466 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 30 mm [±0,1 mm] |
| Width | 15 mm [±0,1 mm] |
| Height | 2 mm [±0,1 mm] |
| Weight | 6.75 g |
| Magnetization Direction | ↑ axial |
| Load capacity ~ ? | 2.11 kg / 20.69 N |
| Magnetic Induction ~ ? | 115.11 mT / 1151 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 modeling of the magnet - technical parameters
The following values are the direct effect of a mathematical calculation. Values rely on models for the class Nd2Fe14B. Real-world conditions may differ. Treat these data as a preliminary roadmap during assembly planning.
Table 1: Static pull force (pull vs distance) - power drop
MPL 30x15x2 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
1151 Gs
115.1 mT
|
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
warning |
| 1 mm |
1098 Gs
109.8 mT
|
1.92 kg / 4.23 lbs
1920.5 g / 18.8 N
|
low risk |
| 2 mm |
1019 Gs
101.9 mT
|
1.65 kg / 3.65 lbs
1654.9 g / 16.2 N
|
low risk |
| 3 mm |
926 Gs
92.6 mT
|
1.37 kg / 3.01 lbs
1365.9 g / 13.4 N
|
low risk |
| 5 mm |
733 Gs
73.3 mT
|
0.86 kg / 1.89 lbs
855.2 g / 8.4 N
|
low risk |
| 10 mm |
379 Gs
37.9 mT
|
0.23 kg / 0.50 lbs
228.8 g / 2.2 N
|
low risk |
| 15 mm |
203 Gs
20.3 mT
|
0.07 kg / 0.14 lbs
65.6 g / 0.6 N
|
low risk |
| 20 mm |
116 Gs
11.6 mT
|
0.02 kg / 0.05 lbs
21.6 g / 0.2 N
|
low risk |
| 30 mm |
46 Gs
4.6 mT
|
0.00 kg / 0.01 lbs
3.4 g / 0.0 N
|
low risk |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
low risk |
Table 2: Shear load (wall)
MPL 30x15x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
|
| 1 mm | Stal (~0.2) |
0.38 kg / 0.85 lbs
384.0 g / 3.8 N
|
| 2 mm | Stal (~0.2) |
0.33 kg / 0.73 lbs
330.0 g / 3.2 N
|
| 3 mm | Stal (~0.2) |
0.27 kg / 0.60 lbs
274.0 g / 2.7 N
|
| 5 mm | Stal (~0.2) |
0.17 kg / 0.38 lbs
172.0 g / 1.7 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.10 lbs
46.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 lbs
14.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 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 30x15x2 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.63 kg / 1.40 lbs
633.0 g / 6.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.42 kg / 0.93 lbs
422.0 g / 4.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
|
Table 4: Material efficiency (saturation) - sheet metal selection
MPL 30x15x2 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.21 kg / 0.47 lbs
211.0 g / 2.1 N
|
| 1 mm |
|
0.53 kg / 1.16 lbs
527.5 g / 5.2 N
|
| 2 mm |
|
1.06 kg / 2.33 lbs
1055.0 g / 10.3 N
|
| 3 mm |
|
1.58 kg / 3.49 lbs
1582.5 g / 15.5 N
|
| 5 mm |
|
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
| 10 mm |
|
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
| 11 mm |
|
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
| 12 mm |
|
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
Table 5: Thermal resistance (stability) - power drop
MPL 30x15x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.11 kg / 4.65 lbs
2110.0 g / 20.7 N
|
OK |
| 40 °C | -2.2% |
2.06 kg / 4.55 lbs
2063.6 g / 20.2 N
|
OK |
| 60 °C | -4.4% |
2.02 kg / 4.45 lbs
2017.2 g / 19.8 N
|
|
| 80 °C | -6.6% |
1.97 kg / 4.34 lbs
1970.7 g / 19.3 N
|
|
| 100 °C | -28.8% |
1.50 kg / 3.31 lbs
1502.3 g / 14.7 N
|
Table 6: Two magnets (attraction) - field collision
MPL 30x15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Sliding Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.67 kg / 8.10 lbs
2 169 Gs
|
0.55 kg / 1.22 lbs
551 g / 5.4 N
|
N/A |
| 1 mm |
3.53 kg / 7.79 lbs
2 257 Gs
|
0.53 kg / 1.17 lbs
530 g / 5.2 N
|
3.18 kg / 7.01 lbs
~0 Gs
|
| 2 mm |
3.34 kg / 7.37 lbs
2 196 Gs
|
0.50 kg / 1.11 lbs
502 g / 4.9 N
|
3.01 kg / 6.64 lbs
~0 Gs
|
| 3 mm |
3.12 kg / 6.89 lbs
2 122 Gs
|
0.47 kg / 1.03 lbs
469 g / 4.6 N
|
2.81 kg / 6.20 lbs
~0 Gs
|
| 5 mm |
2.63 kg / 5.80 lbs
1 948 Gs
|
0.39 kg / 0.87 lbs
395 g / 3.9 N
|
2.37 kg / 5.22 lbs
~0 Gs
|
| 10 mm |
1.49 kg / 3.28 lbs
1 465 Gs
|
0.22 kg / 0.49 lbs
223 g / 2.2 N
|
1.34 kg / 2.96 lbs
~0 Gs
|
| 20 mm |
0.40 kg / 0.88 lbs
758 Gs
|
0.06 kg / 0.13 lbs
60 g / 0.6 N
|
0.36 kg / 0.79 lbs
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 lbs
142 Gs
|
0.00 kg / 0.00 lbs
2 g / 0.0 N
|
0.01 kg / 0.03 lbs
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 lbs
92 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 lbs
63 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
44 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
32 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
24 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Hazards (electronics) - warnings
MPL 30x15x2 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 7.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 5.5 cm |
| Mechanical watch | 20 Gs (2.0 mT) | 4.5 cm |
| Phone / Smartphone | 40 Gs (4.0 mT) | 3.5 cm |
| Car key | 50 Gs (5.0 mT) | 3.0 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 30x15x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.39 km/h
(5.39 m/s)
|
0.10 J | |
| 30 mm |
20.27 km/h
(5.63 m/s)
|
0.11 J | |
| 50 mm |
20.27 km/h
(5.63 m/s)
|
0.11 J | |
| 100 mm |
20.30 km/h
(5.64 m/s)
|
0.11 J |
Table 9: Anti-corrosion coating durability
MPL 30x15x2 / 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 30x15x2 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 6 236 Mx | 62.4 µWb |
| Pc Coefficient | 0.13 | Low (Flat) |
Table 11: Physics of underwater searching
MPL 30x15x2 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 2.11 kg | Standard |
| Water (riverbed) |
2.42 kg
(+0.31 kg buoyancy gain)
|
+14.5% |
1. Shear force
*Warning: On a vertical wall, the magnet holds just ~20% of its nominal pull.
2. Steel saturation
*Thin steel (e.g. 0.5mm PC case) severely weakens the holding force.
3. Temperature resistance
*For standard magnets, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 0.13
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% |
Ecology and recycling (GPSR)
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
See also deals
Pros and cons of rare earth magnets.
Benefits
- They do not lose power, even over approximately ten years – the drop in power is only ~1% (according to tests),
- They have excellent resistance to magnetism drop when exposed to opposing magnetic fields,
- Thanks to the metallic finish, the plating of nickel, gold-plated, or silver gives an elegant appearance,
- The surface of neodymium magnets generates a intense magnetic field – this is one of their assets,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
- Thanks to versatility in constructing and the ability to modify to complex applications,
- Universal use in electronics industry – they find application in hard drives, motor assemblies, medical devices, also complex engineering applications.
- Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which allows their use in small systems
Cons
- Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
- Neodymium magnets lose strength 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 rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in producing threads and complicated shapes in magnets, we recommend using casing - magnetic mount.
- Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Lifting parameters
Detachment force of the magnet in optimal conditions – what contributes to it?
- with the contact of a yoke made of special test steel, ensuring full magnetic saturation
- with a thickness of at least 10 mm
- characterized by lack of roughness
- with total lack of distance (without paint)
- for force applied at a right angle (pull-off, not shear)
- at room temperature
What influences lifting capacity in practice
- Clearance – the presence of foreign body (rust, tape, air) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet exhibits much less (typically approx. 20-30% of nominal force).
- Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
- Material composition – not every steel attracts identically. Alloy additives worsen the interaction with the magnet.
- Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces weaken the grip.
- Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.
Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate reduces the holding force.
Safe handling of NdFeB magnets
Do not drill into magnets
Mechanical processing of neodymium magnets poses a fire risk. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Pinching danger
Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and broken bones. Use thick gloves.
Medical interference
Individuals with a heart stimulator must keep an large gap from magnets. The magnetism can disrupt the functioning of the implant.
Handling guide
Before use, check safety instructions. Uncontrolled attraction can break the magnet or hurt your hand. Think ahead.
Keep away from computers
Equipment safety: Strong magnets can ruin payment cards and sensitive devices (pacemakers, medical aids, timepieces).
Operating temperature
Keep cool. NdFeB magnets are sensitive to heat. If you need resistance above 80°C, look for HT versions (H, SH, UH).
Eye protection
Despite the nickel coating, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
This is not a toy
Absolutely keep magnets out of reach of children. Risk of swallowing is high, and the effects of magnets clamping inside the body are very dangerous.
Nickel allergy
Medical facts indicate that nickel (standard magnet coating) is a strong allergen. If you have an allergy, prevent touching magnets with bare hands and select encased magnets.
GPS and phone interference
Note: neodymium magnets produce a field that confuses precision electronics. Keep a safe distance from your mobile, device, and navigation systems.
