MPL 15x2x30 / N38 - lamellar magnet
lamellar magnet
Catalog no 020121
GTIN/EAN: 5906301811275
length
15 mm [±0,1 mm]
Width
2 mm [±0,1 mm]
Height
30 mm [±0,1 mm]
Weight
6.75 g
Magnetization Direction
→ diametrical
Load capacity
0.68 kg / 6.68 N
Magnetic Induction
614.34 mT / 6143 Gs
Coating
[NiCuNi] Nickel
4.75 ZŁ with VAT / pcs + price for transport
3.86 ZŁ net + 23% VAT / pcs
bulk discounts:
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Physical properties - MPL 15x2x30 / N38 - lamellar magnet
Specification / characteristics - MPL 15x2x30 / N38 - lamellar magnet
| properties | values |
|---|---|
| Cat. no. | 020121 |
| GTIN/EAN | 5906301811275 |
| Production/Distribution | Dhit sp. z o.o. |
| Country of origin | Poland / China / Germany |
| Customs code | 85059029 |
| length | 15 mm [±0,1 mm] |
| Width | 2 mm [±0,1 mm] |
| Height | 30 mm [±0,1 mm] |
| Weight | 6.75 g |
| Magnetization Direction | → diametrical |
| Load capacity ~ ? | 0.68 kg / 6.68 N |
| Magnetic Induction ~ ? | 614.34 mT / 6143 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 |
Physical analysis of the product - report
Presented data constitute the result of a engineering simulation. Values rely on models for the material Nd2Fe14B. Actual performance might slightly deviate from the simulation results. Treat these data as a reference point during assembly planning.
Table 1: Static pull force (pull vs gap) - power drop
MPL 15x2x30 / N38
| Distance (mm) | Induction (Gauss) / mT | Pull Force (kg/lbs/g/N) | Risk Status |
|---|---|---|---|
| 0 mm |
6128 Gs
612.8 mT
|
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
weak grip |
| 1 mm |
3036 Gs
303.6 mT
|
0.17 kg / 0.37 lbs
166.8 g / 1.6 N
|
weak grip |
| 2 mm |
1736 Gs
173.6 mT
|
0.05 kg / 0.12 lbs
54.5 g / 0.5 N
|
weak grip |
| 3 mm |
1150 Gs
115.0 mT
|
0.02 kg / 0.05 lbs
23.9 g / 0.2 N
|
weak grip |
| 5 mm |
623 Gs
62.3 mT
|
0.01 kg / 0.02 lbs
7.0 g / 0.1 N
|
weak grip |
| 10 mm |
218 Gs
21.8 mT
|
0.00 kg / 0.00 lbs
0.9 g / 0.0 N
|
weak grip |
| 15 mm |
103 Gs
10.3 mT
|
0.00 kg / 0.00 lbs
0.2 g / 0.0 N
|
weak grip |
| 20 mm |
58 Gs
5.8 mT
|
0.00 kg / 0.00 lbs
0.1 g / 0.0 N
|
weak grip |
| 30 mm |
24 Gs
2.4 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
| 50 mm |
7 Gs
0.7 mT
|
0.00 kg / 0.00 lbs
0.0 g / 0.0 N
|
weak grip |
Table 2: Slippage capacity (wall)
MPL 15x2x30 / N38
| Distance (mm) | Friction coefficient | Pull Force (kg/lbs/g/N) |
|---|---|---|
| 0 mm | Stal (~0.2) |
0.14 kg / 0.30 lbs
136.0 g / 1.3 N
|
| 1 mm | Stal (~0.2) |
0.03 kg / 0.07 lbs
34.0 g / 0.3 N
|
| 2 mm | Stal (~0.2) |
0.01 kg / 0.02 lbs
10.0 g / 0.1 N
|
| 3 mm | Stal (~0.2) |
0.00 kg / 0.01 lbs
4.0 g / 0.0 N
|
| 5 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
2.0 g / 0.0 N
|
| 10 mm | Stal (~0.2) |
0.00 kg / 0.00 lbs
0.0 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: Vertical assembly (shearing) - behavior on slippery surfaces
MPL 15x2x30 / N38
| Surface type | Friction coefficient / % Mocy | Max load (kg/lbs/g/N) |
|---|---|---|
| Raw steel |
µ = 0.3
30% Nominalnej Siły
|
0.20 kg / 0.45 lbs
204.0 g / 2.0 N
|
| Painted steel (standard) |
µ = 0.2
20% Nominalnej Siły
|
0.14 kg / 0.30 lbs
136.0 g / 1.3 N
|
| Oily/slippery steel |
µ = 0.1
10% Nominalnej Siły
|
0.07 kg / 0.15 lbs
68.0 g / 0.7 N
|
| Magnet with anti-slip rubber |
µ = 0.5
50% Nominalnej Siły
|
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
|
Table 4: Material efficiency (substrate influence) - power losses
MPL 15x2x30 / N38
| Steel thickness (mm) | % power | Real pull force (kg/lbs/g/N) |
|---|---|---|
| 0.5 mm |
|
0.07 kg / 0.15 lbs
68.0 g / 0.7 N
|
| 1 mm |
|
0.17 kg / 0.37 lbs
170.0 g / 1.7 N
|
| 2 mm |
|
0.34 kg / 0.75 lbs
340.0 g / 3.3 N
|
| 3 mm |
|
0.51 kg / 1.12 lbs
510.0 g / 5.0 N
|
| 5 mm |
|
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
| 10 mm |
|
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
| 11 mm |
|
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
| 12 mm |
|
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
Table 5: Thermal stability (stability) - power drop
MPL 15x2x30 / N38
| Ambient temp. (°C) | Power loss | Remaining pull (kg/lbs/g/N) | Status |
|---|---|---|---|
| 20 °C | 0.0% |
0.68 kg / 1.50 lbs
680.0 g / 6.7 N
|
OK |
| 40 °C | -2.2% |
0.67 kg / 1.47 lbs
665.0 g / 6.5 N
|
OK |
| 60 °C | -4.4% |
0.65 kg / 1.43 lbs
650.1 g / 6.4 N
|
OK |
| 80 °C | -6.6% |
0.64 kg / 1.40 lbs
635.1 g / 6.2 N
|
|
| 100 °C | -28.8% |
0.48 kg / 1.07 lbs
484.2 g / 4.7 N
|
Table 6: Two magnets (attraction) - field range
MPL 15x2x30 / N38
| Gap (mm) | Attraction (kg/lbs) (N-S) | Lateral Force (kg/lbs/g/N) | Repulsion (kg/lbs) (N-N) |
|---|---|---|---|
| 0 mm |
6.95 kg / 15.31 lbs
6 152 Gs
|
1.04 kg / 2.30 lbs
1042 g / 10.2 N
|
N/A |
| 1 mm |
3.45 kg / 7.62 lbs
8 643 Gs
|
0.52 kg / 1.14 lbs
518 g / 5.1 N
|
3.11 kg / 6.85 lbs
~0 Gs
|
| 2 mm |
1.70 kg / 3.76 lbs
6 071 Gs
|
0.26 kg / 0.56 lbs
256 g / 2.5 N
|
1.53 kg / 3.38 lbs
~0 Gs
|
| 3 mm |
0.93 kg / 2.05 lbs
4 482 Gs
|
0.14 kg / 0.31 lbs
139 g / 1.4 N
|
0.84 kg / 1.84 lbs
~0 Gs
|
| 5 mm |
0.36 kg / 0.79 lbs
2 788 Gs
|
0.05 kg / 0.12 lbs
54 g / 0.5 N
|
0.32 kg / 0.71 lbs
~0 Gs
|
| 10 mm |
0.07 kg / 0.16 lbs
1 247 Gs
|
0.01 kg / 0.02 lbs
11 g / 0.1 N
|
0.06 kg / 0.14 lbs
~0 Gs
|
| 20 mm |
0.01 kg / 0.02 lbs
435 Gs
|
0.00 kg / 0.00 lbs
1 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
| 50 mm |
0.00 kg / 0.00 lbs
71 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
47 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
33 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
24 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
18 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
14 Gs
|
0.00 kg / 0.00 lbs
0 g / 0.0 N
|
0.00 kg / 0.00 lbs
~0 Gs
|
Table 7: Protective zones (implants) - warnings
MPL 15x2x30 / N38
| Object / Device | Limit (Gauss) / mT | Safe distance |
|---|---|---|
| Pacemaker | 5 Gs (0.5 mT) | 6.0 cm |
| Hearing aid | 10 Gs (1.0 mT) | 4.5 cm |
| Timepiece | 20 Gs (2.0 mT) | 3.5 cm |
| Mobile device | 40 Gs (4.0 mT) | 2.5 cm |
| Remote | 50 Gs (5.0 mT) | 2.5 cm |
| Payment card | 400 Gs (40.0 mT) | 1.0 cm |
| HDD hard drive | 600 Gs (60.0 mT) | 1.0 cm |
Table 8: Dynamics (cracking risk) - warning
MPL 15x2x30 / N38
| Start from (mm) | Speed (km/h) | Energy (J) | Predicted outcome |
|---|---|---|---|
| 10 mm |
10.13 km/h
(2.81 m/s)
|
0.03 J | |
| 30 mm |
17.53 km/h
(4.87 m/s)
|
0.08 J | |
| 50 mm |
22.63 km/h
(6.29 m/s)
|
0.13 J | |
| 100 mm |
32.01 km/h
(8.89 m/s)
|
0.27 J |
Table 9: Surface protection spec
MPL 15x2x30 / 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: Construction data (Flux)
MPL 15x2x30 / N38
| Parameter | Value | SI Unit / Description |
|---|---|---|
| Magnetic Flux | 2 210 Mx | 22.1 µWb |
| Pc Coefficient | 1.54 | High (Stable) |
Table 11: Physics of underwater searching
MPL 15x2x30 / N38
| Environment | Effective steel pull | Effect |
|---|---|---|
| Air (land) | 0.68 kg | Standard |
| Water (riverbed) |
0.78 kg
(+0.10 kg buoyancy gain)
|
+14.5% |
1. Sliding resistance
*Warning: On a vertical surface, the magnet retains merely approx. 20-30% of its perpendicular strength.
2. Steel thickness impact
*Thin metal sheet (e.g. 0.5mm PC case) drastically weakens the holding force.
3. Thermal stability
*For N38 grade, the max working temp is 80°C.
4. Demagnetization curve and operating point (B-H)
chart generated for the permeance coefficient Pc (Permeance Coefficient) = 1.54
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% |
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 neodymium magnets.
Benefits
- Their strength is durable, and after approximately 10 years it drops only by ~1% (according to research),
- They have excellent resistance to magnetism drop as a result of external magnetic sources,
- A magnet with a metallic gold surface has an effective appearance,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling action at temperatures reaching 230°C and above...
- In view of the ability of accurate forming and customization to custom requirements, magnetic components can be produced in a wide range of shapes and sizes, which expands the range of possible applications,
- Universal use in modern technologies – they serve a role in magnetic memories, electric motors, medical equipment, and modern systems.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Limitations
- To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
- They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
- We recommend a housing - magnetic holder, due to difficulties in creating nuts inside the magnet and complex forms.
- Health risk related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in 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
Best holding force of the magnet in ideal parameters – what affects it?
- on a plate made of structural steel, effectively closing the magnetic field
- possessing a thickness of min. 10 mm to ensure full flux closure
- with a surface free of scratches
- without any insulating layer between the magnet and steel
- for force applied at a right angle (in the magnet axis)
- at ambient temperature approx. 20 degrees Celsius
Impact of factors on magnetic holding capacity in practice
- Distance – existence of any layer (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
- Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
- Material type – ideal substrate is high-permeability steel. Hardened steels may have worse magnetic properties.
- Surface condition – smooth surfaces guarantee perfect abutment, which improves field saturation. Uneven metal reduce efficiency.
- Thermal factor – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.
Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance between the magnet’s surface and the plate decreases the lifting capacity.
Safety rules for work with NdFeB magnets
Magnets are brittle
Despite metallic appearance, the material is brittle and cannot withstand shocks. Avoid impacts, as the magnet may shatter into sharp, dangerous pieces.
Health Danger
Life threat: Neodymium magnets can turn off heart devices and defibrillators. Stay away if you have electronic implants.
Heat warning
Do not overheat. Neodymium magnets are sensitive to heat. If you need resistance above 80°C, look for special high-temperature series (H, SH, UH).
Nickel coating and allergies
It is widely known that nickel (the usual finish) is a potent allergen. If your skin reacts to metals, avoid touching magnets with bare hands or opt for coated magnets.
Do not underestimate power
Be careful. Neodymium magnets act from a distance and snap with huge force, often quicker than you can react.
This is not a toy
NdFeB magnets are not toys. Swallowing multiple magnets may result in them pinching intestinal walls, which poses a critical condition and necessitates immediate surgery.
Dust explosion hazard
Dust produced during cutting of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Precision electronics
Be aware: neodymium magnets generate a field that disrupts sensitive sensors. Maintain a safe distance from your phone, tablet, and GPS.
Crushing force
Danger of trauma: The pulling power is so immense that it can result in blood blisters, crushing, and even bone fractures. Protective gloves are recommended.
Cards and drives
Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and erase data from cards.
