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
Load capacity
2.11 kg / 20.69 N
Magnetic Induction
115.11 mT / 1151 Gs
Coating
[NiCuNi] Nickel
3.89 ZŁ with VAT / pcs + price for transport
3.16 ZŁ net + 23% VAT / pcs
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Technical parameters of the product - 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 |
|---|---|---|
| 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 |
Technical analysis of the assembly - data
The following information constitute the result of a engineering simulation. Values rely on algorithms for the class Nd2Fe14B. Actual conditions might slightly differ from theoretical values. Treat these data as a supplementary guide when designing systems.
Table 1: Static pull force (pull vs gap) - 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 pounds
2110.0 g / 20.7 N
|
medium risk |
| 1 mm |
1098 Gs
109.8 mT
|
1.92 kg / 4.23 pounds
1920.5 g / 18.8 N
|
safe |
| 2 mm |
1019 Gs
101.9 mT
|
1.65 kg / 3.65 pounds
1654.9 g / 16.2 N
|
safe |
| 3 mm |
926 Gs
92.6 mT
|
1.37 kg / 3.01 pounds
1365.9 g / 13.4 N
|
safe |
| 5 mm |
733 Gs
73.3 mT
|
0.86 kg / 1.89 pounds
855.2 g / 8.4 N
|
safe |
| 10 mm |
379 Gs
37.9 mT
|
0.23 kg / 0.50 pounds
228.8 g / 2.2 N
|
safe |
| 15 mm |
203 Gs
20.3 mT
|
0.07 kg / 0.14 pounds
65.6 g / 0.6 N
|
safe |
| 20 mm |
116 Gs
11.6 mT
|
0.02 kg / 0.05 pounds
21.6 g / 0.2 N
|
safe |
| 30 mm |
46 Gs
4.6 mT
|
0.00 kg / 0.01 pounds
3.4 g / 0.0 N
|
safe |
| 50 mm |
12 Gs
1.2 mT
|
0.00 kg / 0.00 pounds
0.2 g / 0.0 N
|
safe |
Table 2: Vertical capacity (wall)
MPL 30x15x2 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.42 kg / 0.93 pounds
422.0 g / 4.1 N
|
| 1 mm | Stal (~0.2) |
0.38 kg / 0.85 pounds
384.0 g / 3.8 N
|
| 2 mm | Stal (~0.2) |
0.33 kg / 0.73 pounds
330.0 g / 3.2 N
|
| 3 mm | Stal (~0.2) |
0.27 kg / 0.60 pounds
274.0 g / 2.7 N
|
| 5 mm | Stal (~0.2) |
0.17 kg / 0.38 pounds
172.0 g / 1.7 N
|
| 10 mm | Stal (~0.2) |
0.05 kg / 0.10 pounds
46.0 g / 0.5 N
|
| 15 mm | Stal (~0.2) |
0.01 kg / 0.03 pounds
14.0 g / 0.1 N
|
| 20 mm | Stal (~0.2) |
0.00 kg / 0.01 pounds
4.0 g / 0.0 N
|
| 30 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
| 50 mm | Stal (~0.2) |
0.00 kg / 0.00 pounds
0.0 g / 0.0 N
|
Table 3: Vertical assembly (sliding) - vertical pull
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 pounds
633.0 g / 6.2 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.42 kg / 0.93 pounds
422.0 g / 4.1 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.21 kg / 0.47 pounds
211.0 g / 2.1 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
1.06 kg / 2.33 pounds
1055.0 g / 10.3 N
|
Table 4: Steel thickness (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 pounds
211.0 g / 2.1 N
|
| 1 mm |
|
0.53 kg / 1.16 pounds
527.5 g / 5.2 N
|
| 2 mm |
|
1.06 kg / 2.33 pounds
1055.0 g / 10.3 N
|
| 3 mm |
|
1.58 kg / 3.49 pounds
1582.5 g / 15.5 N
|
| 5 mm |
|
2.11 kg / 4.65 pounds
2110.0 g / 20.7 N
|
| 10 mm |
|
2.11 kg / 4.65 pounds
2110.0 g / 20.7 N
|
| 11 mm |
|
2.11 kg / 4.65 pounds
2110.0 g / 20.7 N
|
| 12 mm |
|
2.11 kg / 4.65 pounds
2110.0 g / 20.7 N
|
Table 5: Thermal stability (material behavior) - resistance threshold
MPL 30x15x2 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
2.11 kg / 4.65 pounds
2110.0 g / 20.7 N
|
OK |
| 40 °C | -2.2% |
2.06 kg / 4.55 pounds
2063.6 g / 20.2 N
|
OK |
| 60 °C | -4.4% |
2.02 kg / 4.45 pounds
2017.2 g / 19.8 N
|
|
| 80 °C | -6.6% |
1.97 kg / 4.34 pounds
1970.7 g / 19.3 N
|
|
| 100 °C | -28.8% |
1.50 kg / 3.31 pounds
1502.3 g / 14.7 N
|
Table 6: Two magnets (repulsion) - forces in the system
MPL 30x15x2 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Shear Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
3.67 kg / 8.10 pounds
2 169 Gs
|
0.55 kg / 1.22 pounds
551 g / 5.4 N
|
N/A |
| 1 mm |
3.53 kg / 7.79 pounds
2 257 Gs
|
0.53 kg / 1.17 pounds
530 g / 5.2 N
|
3.18 kg / 7.01 pounds
~0 Gs
|
| 2 mm |
3.34 kg / 7.37 pounds
2 196 Gs
|
0.50 kg / 1.11 pounds
502 g / 4.9 N
|
3.01 kg / 6.64 pounds
~0 Gs
|
| 3 mm |
3.12 kg / 6.89 pounds
2 122 Gs
|
0.47 kg / 1.03 pounds
469 g / 4.6 N
|
2.81 kg / 6.20 pounds
~0 Gs
|
| 5 mm |
2.63 kg / 5.80 pounds
1 948 Gs
|
0.39 kg / 0.87 pounds
395 g / 3.9 N
|
2.37 kg / 5.22 pounds
~0 Gs
|
| 10 mm |
1.49 kg / 3.28 pounds
1 465 Gs
|
0.22 kg / 0.49 pounds
223 g / 2.2 N
|
1.34 kg / 2.96 pounds
~0 Gs
|
| 20 mm |
0.40 kg / 0.88 pounds
758 Gs
|
0.06 kg / 0.13 pounds
60 g / 0.6 N
|
0.36 kg / 0.79 pounds
~0 Gs
|
| 50 mm |
0.01 kg / 0.03 pounds
142 Gs
|
0.00 kg / 0.00 pounds
2 g / 0.0 N
|
0.01 kg / 0.03 pounds
~0 Gs
|
| 60 mm |
0.01 kg / 0.01 pounds
92 Gs
|
0.00 kg / 0.00 pounds
1 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 70 mm |
0.00 kg / 0.01 pounds
63 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 80 mm |
0.00 kg / 0.00 pounds
44 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 90 mm |
0.00 kg / 0.00 pounds
32 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
| 100 mm |
0.00 kg / 0.00 pounds
24 Gs
|
0.00 kg / 0.00 pounds
0 g / 0.0 N
|
0.00 kg / 0.00 pounds
~0 Gs
|
Table 7: Safety (HSE) (electronics) - precautionary measures
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 |
| Timepiece | 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) - collision effects
MPL 30x15x2 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
19.00 km/h
(5.28 m/s)
|
0.09 J | |
| 30 mm |
30.91 km/h
(8.59 m/s)
|
0.25 J | |
| 50 mm |
39.87 km/h
(11.08 m/s)
|
0.41 J | |
| 100 mm |
56.39 km/h
(15.66 m/s)
|
0.83 J |
Table 9: Corrosion resistance
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 (Flux)
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 surface, the magnet retains only ~20% of its perpendicular strength.
2. Plate thickness effect
*Thin metal sheet (e.g. computer case) severely reduces 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) = 0.13
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.
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% |
Environmental data
| recyclability (EoL) | 100% |
| recycled raw materials | ~10% (pre-cons) |
| carbon footprint | low / zredukowany |
| waste code (EWC) | 16 02 16 |
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Pros as well as cons of Nd2Fe14B magnets.
Benefits
- They retain magnetic properties for around ten years – the loss is just ~1% (according to analyses),
- They retain their magnetic properties even under external field action,
- The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to look better,
- Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
- Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures approaching 230°C and above...
- Considering the ability of flexible shaping and adaptation to unique needs, neodymium magnets can be produced in a variety of shapes and sizes, which increases their versatility,
- Universal use in innovative solutions – they are utilized in computer drives, electric drive systems, advanced medical instruments, as well as other advanced devices.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Weaknesses
- At strong impacts they can break, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
- Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Limited possibility of producing threads in the magnet and complex shapes - recommended is a housing - mounting mechanism.
- Possible danger to health – tiny shards 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 components of these magnets are able to complicate diagnosis 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
Holding force characteristics
Maximum lifting capacity of the magnet – what it depends on?
- on a plate made of mild steel, effectively closing the magnetic field
- with a thickness minimum 10 mm
- with an ground contact surface
- without the slightest air gap between the magnet and steel
- during pulling in a direction perpendicular to the mounting surface
- at temperature room level
Determinants of lifting force in real conditions
- Distance – existence of foreign body (paint, dirt, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
- Loading method – catalog parameter refers to pulling vertically. When slipping, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
- Surface structure – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Temperature – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.
Holding force was checked on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance between the magnet’s surface and the plate reduces the lifting capacity.
Safe handling of neodymium magnets
Flammability
Combustion risk: Rare earth powder is highly flammable. Do not process magnets without safety gear as this risks ignition.
Precision electronics
Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Keep a separation from your phone, device, and navigation systems.
Allergic reactions
Certain individuals suffer from a contact allergy to Ni, which is the common plating for NdFeB magnets. Extended handling might lead to a rash. We strongly advise wear safety gloves.
Adults only
Always store magnets out of reach of children. Choking hazard is high, and the consequences of magnets connecting inside the body are life-threatening.
Power loss in heat
Watch the temperature. Heating the magnet above 80 degrees Celsius will permanently weaken its magnetic structure and strength.
Magnets are brittle
Protect your eyes. Magnets can explode upon violent connection, launching shards into the air. We recommend safety glasses.
Handling guide
Be careful. Rare earth magnets act from a long distance and connect with huge force, often quicker than you can move away.
Keep away from computers
Do not bring magnets close to a wallet, computer, or screen. The magnetic field can destroy these devices and wipe information from cards.
Hand protection
Danger of trauma: The attraction force is so immense that it can result in hematomas, crushing, and broken bones. Protective gloves are recommended.
Health Danger
Life threat: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
